22 F2012 ROP ballot

National Fire Protection Association 1 Batterymarch Park, Quincy, MA 02169-7471 Phone: 617-770-3000 • Fax: 617-770-0700 • www.nfpa.org

M E M O R A N D U M

TO: NFPA Technical Committee on Water Tanks FROM: Elena Carroll, Administrator, Technical Projects DATE: August 18, 2011 SUBJECT: NFPA 22 ROP TC Letter Ballot (F2012)

____________________________________________________________ The ROP letter ballot for NFPA 22 is attached. The ballot is for formally voting on whether or not you concur with the committee’s actions on the proposals. Reasons must accompany all negative and abstention ballots. Please do not vote negatively because of editorial errors. However, please bring such errors to my attention for action. Please complete and return your ballot as soon as possible but no later than Thursday, September 8, 2011. As noted on the ballot form, please return the ballot to Elena Carroll either via e-mail to [email protected] or via fax to 617-984-7110. You may also mail your ballot to the attention of Elena Carroll at NFPA, 1 Batterymarch Park, Quincy, MA 02169. The return of ballots is required by the Regulations Governing Committee Projects. Attachments: Proposals Letter Ballot

Report on Proposals – November 2012 NFPA 22_______________________________________________________________________________________________22-1 Log #CP1

_______________________________________________________________________________________________Technical Committee on Water Tanks,

Review entire document to: 1) Update any extracted material by preparing separate proposals todo so, and 2) review and update references to other organizations documents, by preparing proposal(s) as required.

To conform to the NFPA Regulations Governing Committee Projects.

Update all referenced publications to the most recent editions.

****Insert Include 22-LCP1_CA ****

_______________________________________________________________________________________________22-2 Log #CP7


Revise text to read as follows:1.2 Purpose. The purpose of this standard is to provide a basis for the design, construction, operation, and

maintenance of water tanks for private fire protection. Nothing in this standard shall prevent the use of systems,methods, or devices thatare equivalent in quality, strength, fire resistance, effectiveness, and durability to those prescribed by this standard,provided technical documentation is made available to the authority having jurisdiction that demonstrates equivalencyand the system, method, or device is appropriate for the intended purpose.

The text has been removed and is covered in section 1.4.

_______________________________________________________________________________________________22-3 Log #9

_______________________________________________________________________________________________Kenneth E. Isman, National Fire Sprinkler Association, Inc.

Add new text to read as follows:Insert new sections 1.5.1 and 1.5.2 as follows:1.5.1 Bladder Tanks Not Within NFPA 22 Scope. The following types of bladder tanks are not required to meet NFPA

22:(1) Listed bladder tanks used as surge suppressers on the discharge side of fire pumps installed in accordance with

NFPA 20.(2) Listed bladder tanks used as expansion tanks for antifreeze sprinkler systems installed in accordance with NFPA

13.(3) Bladder tanks used as foam concentrate tanks installed in accordance with NFPA 16 or NFPA 11.1.5.2 Bladder Tanks Within the Scope of NFPA 22. Bladder tanks shall be permitted to be a part of the water supply for

a fire protection system when they meet the requirements of pressure tanks of this standard.The standard is currently silent on the issue of bladder tanks. There are many different types of

bladder tanks used in the fire protection industry. Our intent is not to disturb the current practice of using bladder tanksin a variety of ways that do not technically meet NFPA 22. But for those circumstances where the bladder tank is usedas a part of the water supply for a sprinkler (or other fire protection system), the tank needs to be pressurized andshould be treated like a pressure tank.

1Printed on 8/18/2011

1 NFPA 22 Log #CP1 CA F2012 ROP

Reference Publication Year in Code Title Change

Most Recent Publication Year

NFPA 13 2007 - 2010

NFPA 14 2007 - 2010

NFPA 15 2007 - 2007

NFPA 20 2007 - 2010

NFPA 24 2007 - 2010

NFPA 25 2008 - 2011

NFPA 70 2008 - 2011

NFPA 72 2007 - 2010

NFPA 241 2004 - 2009

NFPA 780 2008 - 2011

ACI 318 2002 - 2008

ACI 350R 2001 - 2006

ANSI SI 10 1997 IEEE/ ASTM

S10 2010

API 5LC 1998 - 1998

ASHRAE 1993 - 2009 ASME Boiler and Pressure Vessel Code 1998 - 2010

ASTM A 6/ A 6M 2001 - 2011

ASTM A 27/ A 27M 2000 2010

ASTM A 36/ A 36M 2001 2008

ASTM A 53 2001 2010

ASTM A 105/ A105M 2001 2011

ASTM A 106 1999 2010

ASTM A 108 1998 2007

ASTM A 131/ A 131M 2001 2004

ASTM A 139 2000 2010

ASTM A 181/ A 181M 2001 2006

ASTM A 283/ A 283M 2000 2007

ASTM A 285/ A 285M 2001 2007

ASTM A 307 2000 2010

ASTM A 502 1993 2009

ASTM A 516/ A 516M 2001 2010

ASTM A 572/ A 572M 2001 2007

ASTM A 615/ A 615M 2001 2009

ASTM A 668/ A 668M 2001 2009

ASTM A 675/ A 675M 2000 2009

ASTM A 992/ A 992M 2002 2011

ASTM A 1011 2001 2010

ASTM C 578 2001 2011

2 NFPA 22 Log #CP1 CA F2012 ROP

ASTM C 591 2001 2011

ASTM D 751 2001 2006

ASTM D 1171 1999 2007

ASTM D 1183 1996 2011

ASTM D 1751 1999 2008

ASTM D 2261 1996 2007 Standard Specifications of the American Wood Preservers Association by the Empty-Cell Process 2001 2011

AWS A5.1 1991 1991 1991

AWS D1.1 1998 2010

AWWA C652 1992 2002

AWWA D100 1996 2011

AWWA D102 1997 2006

AWWA D103 1997 2009

AWWA D110 1995 2004

AWWA D115 1995 2006

AWWA D120 2001 2009

NWTI Bulletin S82 1982 1982 1982

SSPC 1991 2011

SSPC SP 6 2000 2007

SSPC SP 8 2000 2004

SSPC SP 10 2000 2007 Merriam-Webster's Collegiate Dictionary 2003 2003

Report on Proposals – November 2012 NFPA 22_______________________________________________________________________________________________22-4 Log #25

_______________________________________________________________________________________________Leslie D. Scott, CB&I Inc.

Update referenced AWWA standards to latest editions:AWWA C652-02AWWA D100-05 (2011 edition currently in pre-publication phase)AWWA D102-06 (2011 edition currently in pre-publication phase)AWWA D103-09AWWA D110-04AWWA D115-06.

Referenced AWWA standards have been update to comply with applicable new codes andregulations.

Update referenced AWWA standards to latest editions:AWWA C652-02AWWA D100-11AWWA D102-11AWWA D103-09AWWA D110-04AWWA D115-06.

Revised to reference the newest editions, which have been formally accepted by the AWWA.

_______________________________________________________________________________________________22-5 Log #22

_______________________________________________________________________________________________Technical Committee on Fire Pumps,

Add new text to read as follows:A tank providing suction to a fire pump whose capacity is less than the fire protection demand (flow

rate times flow duration).Resequence existing Section 3.3.1.

Guidance for designing break tanks is needed in NFPA 22. This definition is part of the submittal fordesign guidelines.This submittal to NFPA 22 was accepted by the NFPA 20 committee at the January 2011 ROP meeting in Orlando.This comment was balloted through the Technical Committee on Fire Pumps with the following results:30 Members Eligible to Vote5 Not Returned (J. Beals, D. Haagensen, J. McGrath, J. Roberts, and H. Stewart)25 Affirmative on All0 Negatives0 Abstentions




New text to read as follows:Add a new definition for suction tank as follows:3.3.2 Suction Tank. Any tank that provides water to a fire pump.

The term “suction tank” is used throughout the standard (section 4.1.3 and Table 16.1.4(c) to show afew examples) but is not defined. Although the term is understood by people that know the industry, codes andstandards should not rely on such understanding.

_______________________________________________________________________________________________22-6 Log #CP8


Add new definition as follows:A large diameter shaft that surrounds and encloses the piping below an elevated gravity tank to

provide a measure of insulation and protection.Change the term " " to " " throughout the entire document.

The committee believes that there is potential confusion over the term "riser" as used in NFPA 13 andNFPA 22. The committee has redefined the term "riser" to "tank riser" to maintain terminology separation and clarity.For consistency the term will be revised throughout the document.




Revise text to read as follows:Insert new Section 4.2.

The size and elevation of the tank shall be determined by conditions at each individual property after dueconsideration of all factors involved.

Wherever possible, standard sizes of tanks and heights of towers shall be as specified in 5.1.3, 6.1.2, 8.1.3, andSection 9.2.

For suction tanks, the net capacity shall be the number of U.S. gallons (cubic meters) between the inlet of theoverflow and the level of the vortex plate.

A tank shall be sized so that the stored supply plus reliable automatic refill shall be sufficient to meet the demandplaced upon it for the design duration.

A break tank shall be sized for a minimum duration of 15 minutes with the fire pump operating at 150 percent ofrated capacity.

The adequacy and dependability of the liquid source for filling the are of primary importance and shall be fullydetermined, with due allowance for its reliability in the future.

Any source of water that is adequate in quality, quantity, pressure, and reliability to fill the tank in accordancewith this standard shall be permitted.

Where the water supply from a public service main is not adequate in quality, quantity, or pressure, analternative water source shall be provided.

The adequacy of the liquid supply shall be determined and evaluated prior to the specification and installationof the tank.Resequence Existing Section 4.2 – 4.15.

Guidance for designing break tanks is needed in NFPA 22. This definition is part of the submittal fordesign guidelines.This submittal to NFPA 22 was accepted by the NFPA 20 committee at the January 2011 ROP meeting in Orlando.This comment was balloted through the Technical Committee on Fire Pumps with the following results30 Members Eligible to Vote5 Not Returned (J. Beals, D. Haagensen, J. McGrath, J. Roberts, and H. Stewart)25 Affirmative on All0 Negatives0 Abstentions

Insert new Section 4.2.

The size and elevation of the tank shall be determined by conditions at each individual property after dueconsideration of all factors involved.

Wherever possible, standard sizes of tanks and heights of towers shall be as specified in 5.1.3, 6.1.2, 8.1.3, andSection 9.2.

For suction tanks, the net capacity shall be the number of U.S. gallons (cubic meters) between the inlet of theoverflow and the level of the vortex plate.

A tank shall be sized so that the stored supply plus reliable automatic refill shall be sufficient to meet the demandplaced upon it for the design duration.

A break tank shall be sized for a minimum duration of 15 minutes with the fire pump operating at 150 percent ofrated capacity.

The adequacy and dependability of the water source for filling the tank are of primary importance and shall befully determined, with due allowance for its reliability in the future.

Any source of water that is adequate in quality, quantity, pressure, and reliability to fill the tank in accordancewith this standard shall be permitted.

Where the water supply from a public service main is not adequate in quality, quantity, or pressure, an


Report on Proposals – November 2012 NFPA 22alternative water source shall be provided.

The adequacy of the water supply shall be determined and evaluated prior to the specification and installationof the tank.Resequence Existing Section 4.2 – 4.15.

NFPA 22 pertains only to water tanks and not to storage of other liquids.

_______________________________________________________________________________________________22-9 Log #26


Delete the language 'and heights of towers'.The referenced sections don't address heights of towers.

See Committee Proposal 22-10 (Log #CP9)

_______________________________________________________________________________________________22-10 Log #CP9


Revise text to read as follows:4.1.2 Wherever possible, standard sizes of tanks and heights of towers shall be as specified in 5.1.3, 6.1.2, 8.1.3, and

Section 9.2 and 10.3.The standard sizes for concrete tanks should also be referenced here in Chapter 4.

_______________________________________________________________________________________________22-11 Log #27


Revise this section to provide specific distances required to be considered ‘not subject to fireexposure’ or provide reference to another standard that does provide specific direction.

The location of tanks shall be such that the tank and structure are not subject to fire exposure.It is unclear how to identify what distance constitutes 'not subject to fire exposure'.

Revise text to read as follows:The location of tanks shall be such that the tank and structure are protected from not subject to fire exposure in

accordance with 4.2.1.1 through 4.2.1.5.The subsections provide the manner by which the tank shall be protected from fire exposure.

_______________________________________________________________________________________________22-12 Log #28


Coordinate the language of Sec. 4.2.1 and 4.2.1.1 to eliminate the contradictory language bystating something like ‘Except as provided in 4.2.1.1, the location of tanks …"

This section allows tanks to be subject to fire exposure contradicting Sec. 4.2.1 that prohibits locationswhere the tank would be subject to fire exposure.Which requirement applies?

The language is not contradictory. See Committee Action on Proposal 22-11 (Log #270).




Revise text to read as follows:Revise section 4.2.1.2 by inserting the words, “supporting tanks” so that the sentence reads, “4.2.1.2 Fireproofing,

where necessary, shall be provided for steelwork supporting tanks within 20 ft . . .”The proposed additional words are necessary to show that the steel of the tank itself is not required to

be fireproofed. Only the support structure is required to be protected from fire exposure.

_______________________________________________________________________________________________22-14 Log #29


Revise this section to identify specific conditions for which the manufacturer must provide systemsor features not described in NFPA 22.

This section requires: ‘In addition to complying with the requirements of this standard, it is expectedthat the manufacturers of approved structures will also follow the spirit of the standard, by using their experience andability to create structures that prove reliable under specified conditions.’As written, the language does not provide specific requirements which can lead to conflict between contractor, owner

and AHJ. Are there sections of NFPA 22 that do not include sufficient requirements such that the manufacturer would beexpected to provide designs, details or methods in excess of the requirements of NFPA 22?

Submitter did not provide specific text, per 4.3.3(c) of the Regulations Governing CommitteeProjects.

_______________________________________________________________________________________________22-15 Log #31


Revise the requirement by deleting the words ‘where a balcony is omitted.’This section requires inspection to include a check of the appearance of welding in tank plates where a

balcony is omitted.Is the appearance of welding really important if the balcony is omitted?Is there an acceptance criteria for 'appearance' or do we just comment that the welding may be of unsightly or

unacceptable appearance?




Delete the requirement for measuring the extent of inaccessible dents.This section requires the inspection to include the extent of inaccessible dents. If the dents are

inaccessible how is the extent of the dents to be determined?

Revise text to read as follows:The inspection shall include, but shall not be limited to, a check of the following:

(1) The thickness of butt-welded plates in tanks and tubular columns(2) The appearance of welding in tank plates where a balcony is omitted and in tubular columns and at struts, except

near the ladder and base of the structure(3) The extent of inaccessible dents and out-of-roundness of tubular columns and struts

The committee agrees with the submitter's point. Specific text was not provided.

_______________________________________________________________________________________________22-17 Log #6

_______________________________________________________________________________________________Jon Nisja, Northcentral Regional Fire Code Development Committee

Alter section 4.8 as follows:To prevent lightning damage to tanks, protection shall be installed in accordance with

Section 4.4 of NFPA 780.Section 4.4 of NFPA 780 is a very small part of the Standard that deals with mechanical damage or

displacement only. There are numerous references throughout 780 dealing with lightening protection in tanks and 4.4 isnot the only reference. If the intent is to require lightning protection, NFPA 780 should be referenced in its entirety.

_______________________________________________________________________________________________22-18 Log #32


Revise the reference section of NFPA 780 to Sec. 5.4.This section requires lightning protection in accordance with Sec. 4.4 of NFPA 780.

See Committee Action on Proposal 22-17 (Log# 6). The committee believes that NFPA 780,Standard for the Installation of Lightning Protection Systems, should be referenced in its entirety.

_______________________________________________________________________________________________22-19 Log #33


Revise this section by adding specific acceptance criteria or tolerances.This section requires that workmanship be of such quality that defects or injuries are not produced

during manufacture or erection.What constitutes a defect if dents and out of roundness are acceptable (as identified in inspection per 4.4.2.1) ?





Revise the language of Sec. 4.14.1 in conjunction with Sec. 5.6.5.1 to eliminate the contradictoryrequirements.

This section requires the when the roof is essentially airtight, there shall be a substantial vent abovethe maximum water level. Sec. 5.6.5.1 requires that the roof fit tightly to thetop of the tank to prevent the circulation of air over the surface of the water.

See Committee Action on Proposal 22-52 (Log# 52).

_______________________________________________________________________________________________22-21 Log #35


Revise this section by deleting the end of the sentence beginning with ‘… to minimize the risk…’If necessary, move language to the Annex.

This section states ‘Where dual service is specified and where local health departments requirescreening vents against insects, a non-metallic screen or special fail-safe vent shall be provided to minimize the risk inthe event that the screens frost over.How does a non-metallic screen minimize risk in the event that the screens frost over?

Revise text to read as follows:Where dual service is specified and where local health departments require screening vents against insects, a

nonmetallic screen or special fail-safe vent shall be provided to minimize the risk in the event that the insect screensocclude frost over.

The committee agrees that the use of non-metallic screens does not minimize the risk of thescreen occluding.

_______________________________________________________________________________________________22-22 Log #36


Replace 'roof vent' with 'vent fan'.This section requires that a roof vent be attached to a flanged neck prior to entering the tank. If a vent

would suffice, then the cover of the flanged neck could just be removed toprovide the same natural ventilation provided by a vent. It seems that the intention was to add a fan to the flanged neckto provide forced ventilation.




Revise this section to reference AWWA D100 for limitations on plate thickness.Under AWWA D100, ASTM A283 Gr A is only allowed for non-structural components, Gr B and Gr C

are limited to 1 in. for shell plates and Gr D is limited to 3/4 in. for shell plates. API 650 has similar limitations. UnderNFPA 22, no restrictions apply.

Revise text to read as follows:Plate materials shall be of open-hearth, electric furnace, or basic oxygen process steel that conforms to

AWWA D100 and one of the following ASTM specifications:(1) ASTM A 36/A 36M(2) ASTM A 283/A 283M, Grades A, B, C, and D

The committee agrees with the submitter's substantiation. Specific text was not provided.

_______________________________________________________________________________________________22-24 Log #38


Revise this section to read '… that complies with one of the following ASTM specifications…"As written, this sections requires plates to comply with all referenced specifications, which they will not.


_______________________________________________________________________________________________22-25 Log #39


Revise this section with limitations on plate thickness or delete this material option.ASTM A285 specification includes grades A, B and C with minimum published yield strengths ranging

from 24,000 psi to 30,000 psi. ASTM A285 material is not allowed byunder AWWA D100 requirements and API 650 (for oil tanks) only allows grade C for thickness not over 1 inch. ASTMA283 specification is limited in thickness and applicationin both AWWA D100 and API 650.

See Committee Action on Proposal 22-23 (Log# 37). By referencing AWWA D100, this sectiondoes not need to be revised.

_______________________________________________________________________________________________22-26 Log #40


ASTM A20 should be referenced for these.ASTM A6 is not applicable to ASTM A516 and ASTM A285 plate.

Revise text to read as follows:Plates shall be furnished, based on weight, with permissible underrun and overrun

in accordance with the tolerance table for plates ordered to weight in ASTM A 620.The committee agrees with the submitter's substantiation. Specific text was not provided.




Revise this section to reference ASTM F1554 or reference AWWA D100 requirements.ASTM A307 no longer includes anchor bolts (Grade C). The 2007 edition was revised to delete ASTM

A307 Grade C (anchor bolts) and all related references to anchor bolts and reference made to ASTM F1554 Gr 36instead. ASTM A307 Gr A and B do not cover anchor bolt specifications.

Revise text to read as follows:Bolts and anchor bolts shall conform to AWWA D100 ASTM A 307, Grade A or Grade B.

The committee agrees with the submitter's substantiation. Specific text was not provided.

_______________________________________________________________________________________________22-28 Log #42


Revise this section to specifically allowable the stress increase per AWWA D100.Section 5.3.1 prescribes earthquake resistance per D100. Under AWWA D100, seismic design would

include a 1/3 increase in allowable stress.

The increase in allowable stress is specified by reference to AWWA D100.

_______________________________________________________________________________________________22-29 Log #43


Revised Sec. 5.4 to indicate Table 5.4 values plus the increase per 4.11.7, if applicable.This section states that stress produced by specified loads, including seismic loads, shall not exceed

the values listed in Table 5.4. This does not allow the 1/3 increase indicated by Sec. 4.11.7.


_______________________________________________________________________________________________22-30 Log #91


Revise the table to include an allowable for A36, the common steel grade in use today with apublished minimum yield strength, Fy, of 36,000 psi.

The allowable stress value for tension on net section of rolled steel does not reflect the currentrequirements in AWWA D100 that address different classes of steels based ontheir minimum published yield strength. The allowable tension stress in Table 5.4 appears to be based on outdatedrequirements that did not consider Class 2 materials. The older requirements were based on 0.50Fy and considered thatthe commonly used material had a published minimum yield strength, Fy, of 30,000 psi.

The committee agrees with the submitter. However, the proposal did not provide specific text,per 4.3.3(c) of the Regulations Governing Committee Projects. The committee will form a task group to modify Table 5.4at the comment stage.




Revise the table name or change the table contents to only include bending allowables.

The title of Table 5.4 indicates that only bending stresses are included in the table. The table includesvalues for other types of stresses (the first two entries are for direct tension stress, not tension due to bending).

See Committee Action on Proposal 22-30 (Log #91).

_______________________________________________________________________________________________22-32 Log #93


Add a section referencing AWWA D100 for allowable anchor bolt stresses for load cases includingseismic loads.

The allowable tension stress for anchor bolts is very low compared with other industry tank standardssuch as AWWA D100 or API 650 resulting in anchor bolts substantiallylarger than normal.


_______________________________________________________________________________________________22-33 Log #94


Revise the table values for anchor bolts to reflect current design practices of AWWA D100-05,Table 5.

AWWA D100 provides allowable stresses for several different material specifications and grades ofanchor bolts. Also, the allowable stresses for anchor bolts subject to seismic loading are higher than shown in Table15.4, even if the one-third allowable stress increase is applied. The allowable stress levels in Table 5.4 appear to bebased onoutdated AWWA D100 requirements.


_______________________________________________________________________________________________22-34 Log #95


Revise this table with a footnote that the allowable stress on anchor bolts is based on the area atthe root of the threads.

The allowable tension stress for anchor bolts does not indicate to which area they must be applied:root area, tensile stress area, gross area. AWWA D100 requires the anchor bolts to be designed based on the root areaof the threaded portion.





Revise the formulas for compressive allowable.

***Insert Artwork (Table 5.4) Here***The table inaccurately displays the values for compression on extreme fibers of rolled sections, plate

girders and built-up members.


_______________________________________________________________________________________________22-36 Log #44


Revise this section by adding the following sentence:The minimum thickness shall apply to the order thickness, regardless of thickness under-run allowed in the material

specification.This section requires that the minimum thickness of tubular columns and struts shall be 1/4 in.

The current text is clear as written. The committee's intent is to require a minimum thicknessof 1/4 in.

_______________________________________________________________________________________________22-37 Log #45


Revise Section 5.5.1.1 as follows:"Except for cylindrical shell plates in contact with water, the minimum thickness of..."

This section contradicts 5.5.1.1 with respect to minimum thickness.

The committee disagrees that there is a conflict between 5.5.1.1 and 5.5.1.6, since 5.5.1.6does not specify any minimum thickness that is less than 1/4 in.

_______________________________________________________________________________________________22-38 Log #97


Revise the table to indicate the intended transition point or revise ‘Bottom rings’ to ‘Bottom ring’.What is meant by the following terms:

- Bottom rings (does this mean all rings below the top ring or all rings below mid height of the shell?)- Upper rings (does this mean all rings above the bottom ring or all rings above mid height of the shell?)





Revise Section 5.5.2.2 as follows:"Except for tubular sections, the sections shall be..."

This section requires tubular sections to be hermetically sealed. If they are hermetically sealed tubularsections, then they cannot be open sections as required by 5.5.2.2.

Revise text to read as follows:Except for hermetically-sealed tubular sections, the sections shall be open to facilitate cleaning and painting.

Tubular sections used for columns on elevated legged tanks shall be hermetically sealed to prevent internalcorrosion.

Not all tubular sections are hermetically sealed.

_______________________________________________________________________________________________22-40 Log #47


Revise this section by specifying the salt concentration and the types of salt intended to becovered.

This section includes requirements for tanks that are to contain salt.How much salt must be present to be considered a ‘tank that is to contain salt’?Does this requirement apply to table salt or sea salt only, or does it apply to other salts as well?


_______________________________________________________________________________________________22-41 Log #48


Revise this section by specifying the salt concentration above which the corrosion allowanceapplies.

This section includes requirements for tanks that are to contain salt.Was this intended to mean ‘tanks that are to contain salt water’?If so, is there a minimum concentration at which the corrosion allowance applies?





Revise this section by specifying the pH range(s) for which the corrosion allowance applies.This section includes corrosion allowance requirements for tanks that are to contain alkaline water. If

the pH of the water exceeds 7 it is considered alkaline, even if it is only7.1. For purposes of this requirement for corrosion allowance, there must be a pH level at which the water is to be

considered alkaline and a corrosion problem.


_______________________________________________________________________________________________22-43 Log #50


Revise this section to include the 1/3 increase in allowable stress for load cases including seismicloads (per Sec. 4.11.7 or AWWA D100).(see also related comment on Sec. 5.4).

This section allows tank design in accordance with AWWA D100, Sec. 14. Under AWWA D100 Sec.14 design, a 1/3 increase in allowable stresses would apply for the seismic load case.Does the 1/3 increase in allowable stress provided in AWWA D100 apply for this case? If this option is not selected,

does the 1/3 increase in allowable stress of Sec. 4.11.7 apply for the seismic load case?


_______________________________________________________________________________________________22-44 Log #51


Revise the language to reference AWWA D100 requirements for allowable local bucklingstress; orRevise to say ‘… the selected plate thickness shall comply with the allowable local buckling provide allowable local

buckling stresses of this standard.’ And then add provisions for allowable local buckling stresses.This section includes a requirement that in cases where compressive stresses exist, the selected plate

thickness shall prevent local buckling. The design requirements cannot prevent local buckling, but we can design withinthe allowable local buckling stresses to achieve the recommended strength for buckling resistance.

Revise text to read as follows:Where compressive stresses exist, the selected plate thickness shall prevent local buckling in accordance with

AWWA D100.The committee agrees with the submitter's substantiation, but specific text was not provided.

Between the options proposed by the submitter, the committee prefers to reference AWWA D100.




Delete this exception or rewrite this section in conjunction with Sec. 5.5.3.This requirement (5.5.7.1) shall not apply to plate thicknesses calculated in accordance with Sec.

5.5.3.Based on review of the standard, it appears that all tank plates must be calculated in accordance with Sec. 5.5.3, so

this exception means that it does apply to any tank plates.

Delete Section 5.5.7.1.1.The committee agrees with the submitter's recommendation to remove 5.5.7.1.1.

_______________________________________________________________________________________________22-46 Log #54


Revise this section to read:The longitudinal joints in adjacent circumferential courses shall be staggered or shall be aligned.

The entire Chapter 5 is for welded steel tanks.

Submitter did not provide a technical justification.

_______________________________________________________________________________________________22-47 Log #55


Because 5.5.8.3 applies to all tank plates, delete Sec. 5.5.8 and all subsections or rewrite theexception to match the intent.

Permission to use 4-way junctions shall not apply to plate thicknesses in accordance with Sec. 5.5.3.Based on review of the standard, it appears that all tank plates addresses in Sec. 5.5.8 must be calculated in

accordance with Sec. 5.5.3, so it appears that Sec. 5.5.8.3 negates the validity of Sec. 5.8

Delete section 5.5.8.The committee agrees with the submitter and chooses to delete the section.

_______________________________________________________________________________________________22-48 Log #1

_______________________________________________________________________________________________Steven Adolphsen, CBI Services

Revise text as follows:The roof purlin depth shall NOT be less than 1/30 of the span length.

Limiting depth causes purlins to be springy and adds to ponding on roof due to mid span deflection. Iflateral stability is of concern, then specify bracing (we use 12.5' max).

See Committee Action on Proposal 22-50 (Log #CP2).




Revise the term 'shall' should be 'may' allowing rafters to be less than L/30 rather than requiring it,orRevise the term ‘shall’ to ‘shall not’ if it is intended to require stiffer roofs for NFPA 22 tanks than would otherwise be

provided for AWWA D100 water tanks.This requirement is an inadvertent error when updating from earlier editions of AWWA and AISC

requirements. Under the 1955 edition of AWWA D100, based on the thenapplicable AISC specifications for design of structural steel (June 1949 edition), D100 included an exception to therequirements of the AISC rules. The AISC specification atthat time required that the depth of roof purlins be no less than 1/30 of the span. AWWA D100 then required design inaccordance with the AISC specification except that theminimum depth of roof rafters may be less than 1/30 of the span.Later editions of the AISC specification eliminated the minimum depth of members support roofs. AWWA D100

requirements continued to carry the exception until the 1973edition, where the exception was only allowed as long as the design roof pitch was at least 3/4 :12 in order to minimizeponding. Then, in the 2005 edition, AWWA D100 was revised to require a minimum roof slope of ¾:12, therefore thereference to minimum depth hasbeen deleted.It appears that at some point, the NFPA standard decided to revise the language from ‘may be less than 1/30 of the

span length’ to ‘shall be less than 1/30 of the span length’,but failed to realize that the language in AWWA D100 was stated as ‘may be less’ because it was an exception to theAISC requirement. So, when the language in NFPA 22 wasrevised, ‘may’ should have changed to ‘shall not’.As stated in the current standard, this requires rafters of relatively short depth which produces springy roof structures

with more deflection. The current AWWA D100 requiresa minimum roof slope of ¾:12, therefore the reference to minimum depth has been deleted.


_______________________________________________________________________________________________22-50 Log #CP2


Delete Section 5.5.10.2.This section is being removed for compatibility with AWWA D100.




Revise Sec. 5.6.2 to only apply to elevated tanks as follows:‘For elevated tanks, plates shall be …’

Add a new section to 5.6 referencing erection tolerances from AWWA D100 as follows:‘Tanks shall meet the erection tolerance requirements of AWWA D100.’

Current industry standards only require rolling of shell plates for elevated steel tanks.Also, under AWWA D100, all tanks must meet specific erection tolerances to confirm validity of design for compressive

loads.

_______________________________________________________________________________________________22-52 Log #52


Delete this section or rewrite to coordinate with Sec. 4.14.1.It seems that ‘… prevent circulation of air over the surface of the water’ prevents open vents above the

top capacity line which conflicts with Sec. 4.14.1 that requires a vent.

Revise text to read as follows:The roof shall fit tightly to the top of the tank to prevent the circulation of air over the surface of the water shell

to eliminate any gap between the roof and the shell.

The revised text clarifies the intent of the section.

_______________________________________________________________________________________________22-53 Log #58


Delete the words:‘…to prevent the circulation of air over the surface of the water.'

Roof fitted tight to the top of the tank does not prevent the circulation of air over the surface of thewater.Which is the requirement: roof fitted tight to the top of the tank or prevention of air circulation of the surface of the

water?Why is this required?





Revise this section to reference that the sand base shall conform to the requirements of AWWAD100 as follows:‘The sand pad, including pH range of the lime sand mix, sulfate content and chloride content shall meet the

requirements of AWWA D100.’This section requires a lime treatment of the undertank sand pad to achieve a pH between 6.5 and 7.5

and limits the chloride content to 300 ppm and the sulfate content to1000 ppm.For corrosion protection of the underside of the tank bottom, AWWA D100 requires limits on chlorides of 200 ppm and

sulfates of 100 ppm and, if the sand is treated withlime, a minimum pH of 10.5 for the lime sand mix.Are the higher limits of chlorides and sulfates and low pH range required by NFPA 22 based on testing or research or

is this requirement a holdover from previous editions?

_______________________________________________________________________________________________22-55 Log #60


Revise the language by deleting the reference to the inside ladder being located at the secondhatch and adding language that an inside ladder be provided for access to the tank floor.

Sections 5.7.3.1, 5.7.3.5 and 5.7.4.1 contain the following requirements:- An easily accessible roof hatch … shall be provided.- A second roof hatch shall be place 180° from the existing roof hatch with a ladder to access the tank floor.- Outside and inside steel ladders that are arranged for convenient passage from one to the other and through the roof

hatch shall be provided.From these requirements, the inside ladder will be 180° apart from the outside ladder since the outside ladder will

provide easy access to the first hatch, and the inside ladder is located at the second hatch.

***Insert Figure Here***

Revise text to read as follows:5.7.3.5 A second roof hatch shall be placed 180 degrees from the primary existing roof hatch with a ladder to access

the tank floor.5.7.4.1 Outside and inside steel ladders that are arranged for convenient passage from one to the other and through theprimary roof hatch shall be provided.Revise Fig B.1(I) to show secondary roof hatch 180 deg from primary roof hatch.

Delete the centerline of the hatch.

***INSERT 22- (Log# 60)-CA. FIGURE B1(I).*** HERE

The revised language clarifies the committee's intent that a second interior ladder is notrequired. The purpose of the second roof hatch is for ventilation.


ecarroll

Text Box

Art Submitted with Proposal



Revise section 5.7.5.4 to read:‘All outside ladders shall be …’

Section 5.7.5 addresses ‘Outside Fixed Shell and Roof Ladder’.

The text is located under the Outside Ladder section.

_______________________________________________________________________________________________22-57 Log #62


Revise text to read as follows:Except for the underside of the floor on ground-supported flat-bottom tanks, interior dry surfaces of single pedestal

tanks, and faying surfaces of bolted joints that prohibitcoatings, parts that are inaccessible after fabrication shall be protected by paint before assembly.

Clarify ‘… but that are subject to corrosion …’- Does this mean only interior parts exposed to the stored water or vapor zone?- Does it include exterior weather exposed parts?- Is it only intended to exclude parts such is inside dry surfaces (pedestal tanks) or inaccessible parts that are

hermetically sealed from the water, water vapor, or weather?

Revise text to read as follows:5.7.8.1 Except for the underside of the floor on ground-supported flat-bottom tanks, parts that are inaccessible after

fabrication, but that are subject to corrosion, shall be protected by paint before assembly.The rejected parts of the proposal are covered under the definition of parts that are

inaccessible after fabrication.

_______________________________________________________________________________________________22-58 Log #63


Revise this section to state either ‘… protected by primer …’ or ‘… protected by full coatingsystem…’

This section requires that parts that are inaccessible after fabrication, but that are subject to corrosion,shall be protected by paint before assembly. It is unclear whether ‘protected by paint’ means primed and finish coated orwhether the primer coat of paint is sufficient.

The intent of the standard is not to dictate how many coats of paint are required to protectsteel. It is up to the purchaser to determine.




Revise the language to clarify that this requirement does not apply to the underside of tank bottomsthat are covered by Section 5.6.7.

This section as written does not exclude applicability to underside of tank bottoms.


_______________________________________________________________________________________________22-60 Log #65


Delete this section.We haven’t used riveted tank construction for sixty of seventy years and this requirement is in the

section for welded steel tanks, so I have no clue what is intended bythis requirement.It is improbable that suitable welding procedure specifications can be developed to weld a joint that includes oil or

lacquer on the surfaces contained inside the joint such ascontact surfaces between two members being completely welded together.

_______________________________________________________________________________________________22-61 Log #66


Revise this section by deleting the words:‘…, or pickling in accordance with SSPC SP 8, …’

SSPC SP8 may not give suitable profile for adhesion of coatings. Most coating systems today requirea surface profile not achievable by pickling.

_______________________________________________________________________________________________22-62 Log #67


Revise the section to address the following items:1. Allow weld margins on components to be welded together in the field after being

primed in the shop.2. Not require coatings on faying surfaces of structural bolted joints that prohibit coatings.

None given.

The submitter did not provide specific language or technical substantiation.




Revise this section by deleting the words:‘…, or pickling in accordance with SSPC SP 8, …’

SSPC SP8 may not give suitable profile for adhesion of coatings. Most coating systems today requirea surface profile not achievable by pickling.

_______________________________________________________________________________________________22-64 Log #69


Revise the section to address the following items:Delete the words ‘lead-free’. This requirement is covered by Sec. 5.7.12Revise the language to clearly not require priming on the underside of the floor unless Sec. 5.6.7.1.1 applies.’

Revise to allow weld margins on components to be welded together in the field after being primed inthe shop.

Revise text to read as follows:5.7.9.2 All exterior surfaces and inside dry surfaces (pedestal tanks) shall be cleaned by commercial blasting in

accordance with SSPC SP 6, or pickling in accordance with SSPC SP 8, and shall be primed with one coated oflead-free alkyd in accordance with the requirements of for “Outside Paint System No. 1” of AWWA D102.

The committee removed the words "lead free" and added language to coincide with AWWAD102.

_______________________________________________________________________________________________22-65 Log #70


Revise the language to clearly not require priming on the underside of the floor unless Sec.5.6.7.1.1 applies.

None given.


_______________________________________________________________________________________________22-66 Log #71


Revise the section to include ‘unprimed surfaces’ as follows:After construction, all weld seams, unprimed surfaces, and any areas…"

As written, this section implies that the tank components must be primed prior to erection even thoughSec. 5.7.9.1 and 5.7.9.2 do not require that.

Revise text to read as follows:5.7.9.4 After construction, all weld seams, unprimed margins, or and any areas where the primer (if preprimed) has

been damaged shall be blast-cleaned and patch-primed with the same primer.The revised text removes the implication that all components must be shop primed.




Revise to read ‘… interior surfaces (exposed to stored water or the vapor zone) …’(See also comment related to Sec. 5.7.9.6.)

This section provides requirements for finish coats of interior surfaces exposed to stored water, butfails to include those interior surfaces exposed to the vapor zone.

Revise text to read as follows;5.7.9.5 All finish coat painting for interior surfaces (exposed to stored water) shall be in accordance with the

requirements for “Inside Paint System No. 1” of AWWA D102., using the same basic system throughout.The intent of the standard is not to limit the use of only one AWWA D102 system.

_______________________________________________________________________________________________22-68 Log #73


Revise this section to allow different AWWA D102 Inside Coating Systems to be used for thesurfaces above and below the top capacity level.

Depending on the details of roof constructions utilized, it is sometimes desirable to utilize a differentinterior coating system.If Sec. 5.7.9.5 is intended to apply to all interior surfaces (not only immersion surfaces), then it does not allow a

different coating system for the roof surfaces?


_______________________________________________________________________________________________22-69 Log #74


This is not good practice. Add the language or the vapor zone into Sec. 5.7.9.5.The finish coats for interior surfaces exposed to stored water are required to comply with AWWA D102

Inside Coating System No. 1 per Sec. 5.7.9.5. Because section 5.7.9.5 does not include the language ‘… interiorsurfaces (exposed to stored water or the vapor zone)…’, the interior surfaces above the top capacity level would fallunder Sec. 5.7.9.6 and be finish coated with an exterior coating system.

Revise text to read as follows:Finish coat painting for all exterior and interior surfaces not exposed to stored water shall be in accordance

with the requirements for “Outside Paint System No. 1” of AWWA D102., using two coats of aluminum or alkyd enamelin a color, as specified by the purchaser, to provide a minimum total system dry (not exposed to stored water) filmthickness of 3.5 mils (0.09 mm) for aluminum finishes and 4.5 mils (0.1 mm) for alkyd enamels.

The intent of the standard is not to limit the use of only one AWWA D102 system.




Delete the words ‘not exposed to stored water’.In this sentence, ‘dry’ applies to dry film thickness, not to surfaces not exposed to the water or the

weather.


_______________________________________________________________________________________________22-71 Log #76


Since the reader must go to the AWWA standard for requirements of the coating systems, revisethis section by deleting the end of the sentence beginning with the words ‘, toprovide a minimum total system dry …’

The coating system specifications in AWWA D102-06 are different than those in AWWA D102-97.Outside Coating System No.1 still defines and alkyd coating system with anoption for a four-coat system and an option for aluminum finish coats, but now adds an option silicone alkyd finish coat.The total dry film thickness for each coating systemoption varies, but they do not match those specified in Sec. 5.7.9.6.


_______________________________________________________________________________________________22-72 Log #77


Delete Sec. 5.7.9.6.1.This section states 'As provided for in Outside Paint System No. 4 … ', but Sec. 5.7.9.6 states that

coatings shall be per OCS-1. Outside system No. 4 in the 1997 edition ofAWWA D102 described a vinyl coating system that would not generally be compatible over an alkyd primer. AWWAD102-06 no longer includes a vinyl system. Sec. 5.7.9.3 andSec. 5.7.10 allow for other systems to be used, so this section is not necessary.




Revise to read as follows:With approval of the authority having jurisdiction, other finish coats shall be permitted to be used where they are

compatible with the selected primer, comply with AWWA D102,and are approved by the authority having jurisdiction.

This section allows other finish coats (excluding Inside Coating System No. 5) to be used withapproval of the AHJ. This allows finish coats to be used that may not be compatible with the prime coats. Also, currenteditions of AWWA D100 no longer include coal tar coating system (in AWWA D102-06, ICS-5 is now a zinc rich primer /epoxy / epoxy coating system).


_______________________________________________________________________________________________22-74 Log #CP3


Delete section 5.7.10The standard does not want to refer to coating systems individually. The intent is to reference AWWA

D102 in its entirety.




Revise Section 7.1.4 and add an annex note as follows:

Pressure tanks shall be kept with a supply of water to meet the flow and duration demands of the fire protectionsystem as calculated in Chapter 14 of NFPA 13, for the duration required by Chapter 11 of NFPA 13.

The quantity of air in the tank and pressure shall be sufficient to push all of the water out of the tank whilemaintaining the necessary residual pressure required by Chapter 14 of NFPA 13 at the top of the system.

Where otherwise approved by the authority having jurisdiction, this requirement shall not apply.Pressure tanks must contain a volume of air, that when pressurized, pushes the water out of the tank (see

Figure A.7.1.4.2). The larger the quantity of air, the less pressure is necessary to push the water out of the tank. To sizea pressure tank properly for a hydraulically calculated fire sprinkler system, determine where you are going to locate thetank, calculate the demand of the fire protection system to the discharge flange of the tank, and then select a volume oftank larger than what is needed to meet the flow and duration demand of the fire protection system. Next, calculate thepressure necessary to push the water out of the tank and maintain the pressure demand in the fire protection system. Ifthe pressure necessary to hold in the tank is higher than the pressure rating of the fire protection system components,select a larger tank. Finally, convey to the owner the ratio of water to air that must be kept in the tank and the minimumtank pressure for maintenance purposes.A formula that can be used for determining the pressure at which the tank needs to be held is:Pi = (Pf + 15)/A – 15Where Pi = tank pressurePf = pressure demand of the fire protection system calculated to the discharge flange of the tankA = percentage of the volume of the tank set aside for air, expressed as a decimal (for example 50% would be

expressed as “0.5”)For example, consider a light hazard sprinkler system with a duration demand of 30 minutes and a demand of 125 gpm

at 55 psi calculated to the discharge flange of the tank. If a 5000 gallon tank was used and filled 75% with water, thiswould meet the 3750 gallon duration demand of the sprinkler system (125 × 30 = 3750). The remaining 25% of thevolume of the tank would be available for air and the tank would need to be pressurized to 265 psi as calculated below:Pi = (Pf + 15)/A – 15 = (55 + 15)/0.25 – 15 = 265Clearly this pressure is too high for a sprinkler system where most of the components are rated for a maximum of 175

psi. Unless high pressure rated components are going to be used, a larger thank should be considered. For this samesprinkler system, a 7,000 gallon tank could be used and filled with 3750 gallons of water (54% water and 46% air). Thistank would only need to be pressurized to 137 psi, calculated as follows:Pi = (Pf + 15)/A – 15 = (55 + 15)/0.46 – 15 = 137This would clearly be a better selection of a tank for this fire protection system. Note that the owner will need to know

where the 3750 gallon fill point of the tank is. If the tank is overfilled, then the quantity of air will be decreased and thepressure of 137 will be insufficient to push the water out of the tank at the proper pressure.Tanks above fire protection systems have the advantage of needing less pressure because the water will gain

pressure as it drops out of the tank. However, putting tanks above the fire protection system is not always possible.Tanks in basements will work fine if the pressure is calculated correctly.

***Insert 22_L20_Fig A.7.1.4.2_Rec here***

The pressure tank chapter permits pressure tanks to be used for all kinds of fire protection systems,but only references NFPA 13 in the sizing situation. This is because NFPA 13 is the only document with goodinformation on sizing and calculating the pressure for the tank. Rather than reference NFPA 13, it would be better to putthis information in NFPA 22 directly. Since the information keeps moving in NFPA 13, the chapter references becomeobsolete anyway.




Delete text to read as follows:Delete the sentence that is currently 7.1.6 and all of Section 7.1.6.1. Renumber existing 7.1.6.2 as a new 7.1.6 so that

all that is left of 7.1.6 is the following:Subject to the approval of the authority having jurisdiction, tanks shall be permitted to be buried in

accordance with the requirements of 7.1.10.There is no reason to require tanks to be above the top level of sprinklers and there is no reason to

require special permission of the AHJ to put tanks in the basement or anywhere below the top level of sprinklers. Theformula used by NFPA 13 to size tanks and determine pressure (and proposed for NFPA 22 in our previous proposal)adjusts for the elevation pressure situation by forcing a higher pressure for the tanks below the activatingsprinklers/nozzles.

_______________________________________________________________________________________________22-77 Log #CP10


Revise text to read as follows:7.2.3.3 A listed horizontal bronze-seat swing-check valve and an renewable-disc globe indicating control valve shall be

provided in the horizontal position in the pipe near the tank.7.2.3.4 The globe indicating control valve shall be placed between the check valve and the tank.

The language indicates the modern practice.

_______________________________________________________________________________________________22-78 Log #79


Revise sections 12.2.1, 12.1.1.1, 12.2.1.3, 12.2.2 and 12.2.2.4 to provide consistent, unambiguousrequirements that are not contradictory with each other.

Section 12.2.1 requires the tank to be set on a compacted crushed stone or granular base or onconcrete foundations. Then, Sec. 12.2.11 requires a 3 in. layer of clean dry sand be laid on the compacted grade, butdoes not indicate to which of the types of foundations addressed in Sec. 12.2.1 this will apply.





Revise this section to read:The tops of ring wall foundations shall be level within ±1/4 in. (± 3.2 mm) in one plate length [approximately 34 ft (10.4

m)], and no two points on the wall shall differ by more than ± 1/4 in. (± 6.4 mm).This section states that 'The tops of ring wall foundations shall be level within 1/4 in. ± 1/2 in. in one

plate length and no two points on the wall shall differ by more than 1/2 in. ± 1/4 in.‘The first requirement should reference ± 1/8 in. instead of ± 1/2 in. Secondly, the tolerance designations should read

similar to just ‘± 1/4 in.’. As it reads now for instance, the overall levelness requirement of 1/2 in. ± 1/4 in. indicates thatthe top of the concrete shall be level within 1/4 in. to 3/4 in.

Revise text to read as follows:The tops of ring wall foundations shall be level within 1/4 in. ±1/8 in. (6.4 mm ±3.2 mm) in one plate length

[approximately 34 ft (10.4 m)], and no two points on the wall shall differ by more than 1/2 in. ±1/4 in. (12.7 mm ±6.4mm).

Corrected the tolerances to be in harmony with AWWA D100.

_______________________________________________________________________________________________22-80 Log #81


Revise this section to take exception to 12.2.2 or revise 12.2.2 to say ‘Except as provided in Sec.12.2.2.4, a 10 in. ‘(254 mm) reinforced concrete ring wall …’

Tanks with capacity 4,000 gallons or less are allowed to be set on a granular berm with or withoutsteel retainer rings. However, Sec. 12.2.2 requires that tanks on a crushed stone or granular berm must have a concreteringwall.

Revise text to read as follows:Except as provided in 12.2.2.4, a A 10 in. (254 mm) reinforced concrete ring wall that extends below the frost

line at least 2.5 ft (0.76 m) below finished grade shall be placed directly beneath the tank shell where tanks aresupported on crushed stone or granular bases.

The committee agrees with the submitter and prefers to revise Section 12.2.2.




Revise this section to read:The lower end of the anchor bolts shall terminate in a head, nut, washer plate or u-bolt.Design of the anchor embedment strength shall be in accordance with ACI 318-08.

Based on research findings in ACI report ACI 355.1R-91, AWWA D100 does not allow the use ofhooked anchor bolts.Is the allowance of hooked bolts in this section based on newer studies or research or is this just a legacy provision

that has not been updated?

Revise text to read as follows:12.4.2.1 The lower end of the anchor bolts shall be hooked or fitted with an anchor plate terminate in a head, nut,

washer plate or u-bolt.12.4.2.2 Design of the anchor embedment strength shall be in accordance with ACI 318-08.

Editorial changes to comply with the Manual of Style.

_______________________________________________________________________________________________22-82 Log #83


Rewrite these sections to eliminate the contradictory provisions.Sec. 12.4.3.3 that requires minimum 11/4 diameter anchor bolts, but Sec. 12.4.3.3.1 provides

requirements when anchor bolts are less than 11/4 diameter.

Revise text to read as follows:Except as provided in 12.4.3.3.1, the minimum size of anchor bolts shall be 1-1/4 in. (32 mm).

The committee believes that the revised text meets the submitter's intent.

_______________________________________________________________________________________________22-83 Log #84


Delete Sec. 12.5.1, 12.5.1.1 and 12.5.1.2. If necessary, add the option for mortar encasement toSec. 12.4.3.2.

This section requires that the stressed portions of anchor bolts not be exposed. It seems that thisrequirement prohibits the use of the industry standard detail of an anchorchair used on thousands of tanks to transfer and distribute the anchor load into the tank shell to reduce shell stresses towithin allowable levels. This may have been intended to only address double nut type installation on column base platesfor elevated tanks.This section is not necessary considering the requirements of Sec. 12.4.3.2.

Delete 12.5.1, 12.5.1.1, and 12.5.1.2.The committee does not believe that mortar encasement needs to be addressed.




Rewrite these sections to eliminate the contradictory provisions as follows:12.5.1 When the stressed portions of anchor bolts are exposed, they shall be protected by one of the following

methods:(a) Cleaning and painting in accordance with Sec. 5.7.9 if the exposed anchor bolts and nuts are accessible for

complete cleaning and painting; or(b) Encasement in cement mortar(NOTE: this will require coatings or mortar for stresses portions of galvanized anchor bolts and corrosion-resistant alloy

anchor bolts unless option (c) is added to the above.)These sections contain conflicting provisions for anchor bolts.

Sec. 12.5.1 states that stressed portions of anchor bolts shall not be exposed. Sec. 12.5.1.1 provides requirements forwhen the stressed portions are exposed requiring thebolts be encased in mortar in such cases. Sec. 12.5.1.2 specifies circumstances when mortar encasement is notrequired.Also, these contradict Sec. 12.4.3.2 that provides for required means of corrosion protection when the bolts (and nuts)

are exposed to weather, water, or corrosiveenvironment. None of these methods include encasement in mortar.

See Committee Action on Proposal 22-83 (Log # 84).

_______________________________________________________________________________________________22-85 Log #CP11


Move section 14.1.11.2 to new annex section A.14.1.11.1Unenforceable language was moved to the annex as a recommended practice.

_______________________________________________________________________________________________22-86 Log #19


Revise 14.2.13.1 as follows:14.2.13.1 The discharge outlet for every suction tank shall be equipped with an anti-vortex plate assembly.

There are a couple of little problems with this section. It does not actually refer to the assembly as an“anti-vortex plate assembly”. And it should use the term “suction tank” as earlier defined. This proposal fixes those littleissues. More importantly, the combination of this section and the definition of “suction tank” should solve a problem withpeople eliminating anti-vortex plates from some shaped tanks because they seem to think that they don’t need them. Ithas always been the position of NFPA 22 that the anti-vortex plate needs to be installed. This hopefully closes aloophole.


Report on Proposals – November 2012 NFPA 22_______________________________________________________________________________________________22-87 Log #CP4


Revise text to read as follows:14.2.13.2* The assembly shall consist of a horizontal steel plate that is at least twice the diameter of the outlet on an a

long radius elbow fitting, where required, mounted at the outlet a distance above the bottom of the tank equal to one-halfthe diameter of the discharge pipe.

The proposed text clarifies the intent of the committee and meets the requirements of the HydraulicInstitute.

_______________________________________________________________________________________________22-88 Log #CP12


Revise text to read as follows:14.2.13.2* The assembly shall consist of a horizontal square or round steel plate that is at least twice the diameter of

the outlet on an elbow fitting, where required, mounted at the outlet a distance above the bottom of the tank equal toone-half the diameter of the discharge pipe.

Revised text would permit the use of a round vortex plate.

The committee welcomes public input on the use of a round vortex plate.

_______________________________________________________________________________________________22-89 Log #14


Revise text to read as follows:Revise 14.4.1 by adding “except as provided in 14.4.1.1” at the end of the sentence.Add new section 14.4.1.1 as follows:14.4.1.1 Where a permanent water supply is not available to refill the tank, an approved plan shall be permitted for

manually refilling the tank. During the time that the tank does not have sufficient capacity to meet the demand of the fireprotection system(s), the Impairment Procedures of NFPA 25 shall be followed.

The requirement for a permanent water supply to be available on-site to refill the tank within 8 hourswas added in the 2008 edition, and it is not practical for all applications. Tanks for fire protection exist in desert locationsand other dry areas where there is no well or refill supply on hand. In such cases prior to the 2008 edition, tank trucks orbarges were permitted to be used to refill the tanks as long as plans were in place and accepted by the AHJ prior to afire. Such plans should be permitted again as long as the system without water is treated as an impaired system.

Revise text to read as follows:A permanent pipe connected to a water supply shall be provided to fill the tank, except as provided in 14.4.1.1.

Where a permanent water supply is not available to refill the tank, an approved plan shall be permitted formanually refilling the tank.

During the time that the tank does not have sufficient capacity to meet the demand of the fire protectionsystem(s), the Impairment Procedures of NFPA 25 shall be followed.

Editorial changes to comply with the Manual of Style.




New text to read as follows:Insert New Section 14.5.

Where a break tank is used to provide the pump suction water supply, the installation shall comply with this section.Break tanks are used for one or more of the following reasons:

(1) As a backflow prevention device between the city water supply and the fire pump suction(2) To eliminate pressure fluxations in the city water supply and provide a steady suction pressure to the fire pump(3) To augment the city water supply when the volume of water available from the city is inadequate for the fire

protection demandThe tank shall be sized for a minimum duration of 15 minutes with the fire pump operating at

150 percent of rated capacity.The refill mechanism shall be listed and arranged for automatic operation.

If the break tank capacity is less than the maximum system demand for 30 minutes, the refill mechanism shallmeet the requirements in 14.5.3.1.1 through 14.5.3.1.5.

Dual automatic refill lines, each capable of refilling the tank at a minimum rate of 150 percent of the firepump(s) capacity, shall be installed.

If available supplies do not permit refilling the tank at a minimum rate of 150 percent of the rated pumpcapacity, each refill line shall be capable of refilling the tank at a rate that meets or exceeds 110 percent of themaximum fire protection system design flow.

A manual tank fill bypass designed for and capable of refilling the tank at a minimum rate of 150 percent ofthe fire pump(s) capacity shall be provided.

If available supplies do not permit refilling the tank at a minimum rate of 150 percent of the rated pumpcapacity, the manual fill bypass shall be capable of refilling the tank at a rate that meets or exceeds 110 percent of themaximum fire protection system design flow.

A local visible and audible low liquid level signal shall be provided in the vicinity of the tank fill mechanism.If the break tank is sized to provide a minimum duration of 30 minutes of the maximum system demand, the

refill mechanism shall meet the requirements in 14.5.3.2.1 through 14.5.3.2.5.The refill mechanism shall be designed for and capable of refilling the tank at 110 percent of the rate

required to provide the total fire protection system demand [110% (Total Demand - Tank Capacity) / Duration].A manual tank fill bypass designed for and capable of refilling the tank at 110 percent of the rate required to

provide the total fire protection system demand [110% (Total Demand - Tank Capacity) / Duration].The pipe between the city connection and the automatic fill valve shall be installed in accordance with

NFPA 24, Standard for the Installation of Private Fire Service Mains and Their Appurtenances.The automatic filling mechanism shall be maintained at a minimum temperature of 40°F (4.4°C).The automatic filling mechanism shall activate a maximum of 4 in. (152 mm) below the overflow level.

Resequence existing sections after 14.5.Guidance for designing break tanks is needed in NFPA 22. This definition is part of the submittal for

design guidelines.This submittal to NFPA 22 was accepted by the NFPA 20 committee at the January 2011 ROP meeting in Orlando.This comment was balloted through the Technical Committee on Fire Pumps with the following results:30 Members Eligible to Vote5 Not Returned (J. Beals, D. Haagensen, J. McGrath, J. Roberts, and H. Stewart)25 Affirmative on All0 Negatives0 Abstentions



_______________________________________________________________________________________________Robert Bourke, Northeastern Regional Fire Code Development Committee

Revise text to read as follows:15.1.1.3 Where a house that is located above grade with no large pit beneath it is used, it shall comply with 15.1.1.3.1

and 15.1.1.3.2 be necessary to place the OS&Y gate valve in the vertical part of the tank discharge pipe and toconstruct a small brick or concrete pit or well to contain the check valve in the horizontal pipe below the frost line.15.1.1.3.1 The gate valve shall be provided in the vertical part of the tank discharge.15.1.1.3.2 A small brick or concrete pit or well shall be constructed to contain the check valve in the horizontal pipe

below the frost line.

The section currently is difficult to read. The proposed rewording shows the two specific requirementsas separate and independent and is clearer.

_______________________________________________________________________________________________22-92 Log #CP13


Replace section 15.1.2.5.1 and 15.1.2.6.1 with:Polystyrene shall not be used where the threat of direct exposure to flame exists.

Removes unenforceable text.

_______________________________________________________________________________________________22-93 Log #4


Revise section to read as follows:A valve pit or house shall be of sufficient size to provide a minimum clearance of 12 in. to 18 in. (305 mm to 457 mm)

around all contained equipment.The requirement in this section is vague. If the user is permitted to provide only 12 inches, then that is

the minimum requirement. As written currently, it sounds as though there is a maximum clearance permitted of 18inches. The proposed rewording is clearer.

_______________________________________________________________________________________________22-94 Log #CP14


Delete section 15.1.3.3. Move A.15.1.3.3 to A.15.1.3.2.Remove unenforceable text.




Move section to the Annex A valve house that contains only the OS&Y gate in thedischarge pipe and the heater can usually be made smaller.

A valve house that contains only the OS&Y gate in the discharge pipe and the heater can usually be madesmaller.

There is no requirement statement in this section. It should be placed in the Annex since it providesgood guidance information.

_______________________________________________________________________________________________22-96 Log #2

_______________________________________________________________________________________________James Whitehead, Los Alamos National Laboratory

Add new text as follows:The heating system shall be of such capacity that the temperature of the coldest water in the tank or riser, or

both, is maintained at or above 42°F (5.6°C) during the coldest weather.I propose that the committee agree on what is the acceptable temperature to heat water tanks 40°F or

42°F. It is obvious that 42°F would fulfill both requirements, but I find the lack of consistency to be absurd whenconsidering the cost of these documents.

Proposed text is identical to existing text.

_______________________________________________________________________________________________22-97 Log #15


Revise text to read as follows:Revise Note 2 by adding, “and the bottom water surface area” at the end of the second sentence. The second

sentence will read, “The minimum radiation surface area shall be the wetted tank steel surface area plus the top watersurface area and the bottom water surface area.”

For an elevated tank, the wind will create just as much heat loss as it passes across the bottom of thetank as it does passing over the top of the tank. All sides of the tank exposed to the air should be calculated todetermine the total heat loss.




Revise text to read as follows:Delete the Tank Capacity row at the top of the table.

It is too confusing having two separate headings for each column (Tank Capacity in Gallons andSquare Feet of Tank Surface Area). The critical variable is the square feet of surface area in contact with the cold air.The tank volume is a useless variable. There are an infinite number of combinations of tank diameter and height thatwould create the same volume of tank, yet all of these combinations have different areas. Consider the 100,000 gallontank (8th column of the table), which could be a 25 ft diameter tank 28 ft tall or a 40 ft diameter tank 11 ft tall. The firsttank would have an area of 3181 sq ft, which is pretty close to the 2845 of the table. But the second tank has an area of3895 sq ft, which should use the next column of the table to the right. Since the area is the critical variable, the volumeshould be eliminated.

_______________________________________________________________________________________________22-99 Log #17


Revise text to read as follows:Delete the Tank Capacity row at the top of the table.

It is too confusing having two separate headings for each column (Tank Capacity in Gallons andSquare Feet of Tank Surface Area). The critical variable is the square feet of surface area in contact with the cold air.There are an infinite number of combinations of tank diameter and height that would create the same volume of tank, yetall of these combinations have different surface areas. In this particular case, the surface areas are similar. Forexample, a 250,000 gallon tank (7th column of the table), could be a 40 ft diameter tank 27 ft tall or a 50 ft diameter tank17 ft tall. The first tank would have an area of 4650 sq ft, and the second tank would have an area of 4633 sq ft. Theseareas are similar, but since the area is the critical variable, the volume should be eliminated.




Alter section 17.1.1 as follows:Prior to placing the tank in service, a representative of the tank contractor, and a representative of the owner

and the authority having jurisdiction shall conduct a joint inspection of the completed equipment.

The authority having jurisdiction is required to witness inspection and testing of fire protectionequipment. Water tanks should be no different.

Revise text to read as follows:

Prior to placing the tank in service, a representative of the tank contractor and a representative of the ownershall conduct a joint inspection of the completed equipment.

The authorities having jurisdiction shall be notified as to the time and place of the inspection.Written reports of completed equipment inspections shall be made in triplicate, and a copy that has been

signed by the contractors and the owners shall be sent to the authority having jurisdiction.In order to allow for difficulty in scheduling, the committee does not believe that the presence

of the authority having jurisdiction should be mandatory. However, the committee agrees that the authority havingjurisdiction should be notified.

_______________________________________________________________________________________________22-101 Log #CP5


Add new Section 17.1117.11 Anti-Vortex Plate Inspection17.11.1 After completion of the tank construction, and before filling the tank with water, the anti-vortex plate shall be

inspected.17.11.1.1 The inspection shall verify that the horizontal steel plate and long radius elbow meet the requirements of

14.2.13.2 and are installed in accordance with 14.2.13.3.17.11.2 The inspection results shall be included in the written report specified in Section 17.1.2.

The proposed language is intended to ensure that the anti-vortex plate is properly installed. If therequirements of Section 14.2.13 are not followed, the anti-vortex plate will not function properly. Installation of ananti-vortex plate is critical to preventing the formation of a vortex. If a vortex occurs, there is the potential of introducingair into the suction end of the fire pump, causing cavitation, reduced pump performance and possible pump damage.




Add new annex note:A.4.2.1 Fire exposure risk to a water tank should take into account locations that could be threatened by wildland fire.

NFPA 1144 should be referenced.4.2 requires an examination of fire exposure hazards from nearby structures. In remote locations the

hazard from wildland fires poses a greater risk and should be considered when tank location is determined.

Add new text to read as follows:A.4.2.1 Fire exposure risk to a water tank should take into account locations that could be threatened by wildland fire.

See NFPA 1144 for more information.Editorial changes.

_______________________________________________________________________________________________22-103 Log #10


Revise text to read as follows:Change A.14.2.13.3 to A.14.2.13 and revise the language as follows:A.14.2.13 See Figure B.1(o), Figure B.1(p), and Figure B.1(q).

The figure is of value in explaining the entire concept of the anti-vortex plate, not just the 6 inchdimension that is mentioned in 14.2.13.3, therefore, the figures should be referenced in an annex note attached to thebasic concept of anti-vortex plates (14.2.13).The additional figures should be referenced in the annex note as well.

_______________________________________________________________________________________________22-104 Log #CP6


Add new Section A.17.1.2 as follows:A.17.1.2 See Figure A.17.1.2.

***Insert Figure here***Figure A.17.1.2 Sample Inspection and Testing Form

The proposed new Annex Section provides inspectors and testers with a sample form to use. The formserves as a checklist for the inspectors and tester to ensure they have followed the requirements of Chapter 17 properly.Additionally, similar forms are provided in many other NFPA documents, such as NFPA 3 and NFPA 25.


Water Storage Tanks for Fire Protection Inspection Checklist

Date of Inspection: Capacity:

Inspector Name: Diameter

Inspector Phone #: Height:

Property Name: Year Built:

Property Address:

Inspections Comments

Joint inspection of completed equipment by a representative of the tank contractor and a representative of the owner. Yes No

Anti-vortex plate: size and dimensions correct Yes No

Tests Comments

Welded Steel Tanks:

Has flat bottom? Yes No

Has no leaks in the shell, bottom, or roof Yes No

Bolted Steel Tanks:

Has no leaks Yes No

Pressure Tanks:

Follows ASME Boiler and Pressure Vessel Code? Yes No

Hydrostatic test pressure at least 150 psi? Yes No

Pressure does not drop more than 0.5 psi in 24 hours after being filled at working pressure and 2/3 its capacity? Yes No

Embankment-Supported Coated Fabric Tanks:

Has no leaks prior to shipment or after installation? Yes No

Concrete Tanks:

Fill tank, let it sit for 24 hours and measure liquid volume loss over next 72 hours. Has measurable leakage? Yes No

Wood Tanks:

Check liquid tightness for 48 hours with the help of qualified wood tank specialist? Yes No

In accordance with National Wood Tank Institute Bulletin S82? Yes No

Fiberglass-Reinforced Plastic Tanks:

Hydrostatic test performed? Yes No

All Tanks:

Disposal of test water? Yes No



For clarity revised these details by deleting the dimensions and weld symbols from these details ordelete the details in their entirety.

The weld detail at the top right includes dimensions and weld symbols on three sample joint locationsfor ground-supported welded-steel tanks. Since the requirements in theappendix are not a part of the standard, inclusion of specific details such as dimensions and weld sizes is confusing tothe user of the standard. In many cases, inspection or enforcement officials want to impose those as requirementsbecause, even though ‘not a part of the standard’, they are interpreted as recommendations by NFPA. Also, dependingon tank size and design and construction details, the weld sizes may be inadequate and the actual dimensions may notmatch those shown.Specific details such as these, if considered important, should appear in the standard.Since they only appear in the Appendix, they are intended for information, but what information is really necessary for

the user of the standard?

Delete weld symbol in Elevation view only.

***INSERT FIGURE ELEVATION HERE***22-105 (Log# 86)_R

Weld symbol is not necessary in the elevation view, but should be retained in other views toillustrate where the weld should be located and whether the weld should be single- or double-fillet.

_______________________________________________________________________________________________22-106 Log #87


Revise the welding symbol to reflect AWS welding symbols.

***Insert Figure B.1(I) Here***What is intended by the weld symbol on the shell joints?



ecarroll

Text Box

Art Submitted with Proposal



Revise text to read as follows:Make the following three changes to Figure B.1(o):(1) Change “Anti-vortex plate (48 in. x 48 in.)” to “Anti-vortex plate (minimum 2D x 2D; frequently, a 48 in. x 48 in. size

is used as a standard size that will work for any situation)”(2) Change “6 in.” at the bottom of the figure to “1/2D or 6 in, whichever is greater”(3) Show the diameter of the pipe as “D”

These changes are necessary to match the requirements of NFPA 22. The anti-vortex plate is onlyrequired to be twice the diameter of the discharge pipe for the tank, yet it is shown as 48 inches by 48 inches. ManyAHJ’s don’t understand the rules, but they know how to read a figure and are forcing contractors to replace work thatmeets the standard.

_______________________________________________________________________________________________22-108 Log #88


Correct the weld symbol for the angle-to-anti-vortex plate weld.The detail is missing dimensions for the flange-to-shell offset and shell-to-CL of elbow.

The weld symbol for the angle-to-anti-vortex plate weld indicates a near side and far side weld, but then indicates weldall the way around meaning that those welds wouldinterfere with each other.Clarify the missing dimensions or revise the detail to remove the unused dimension lines.

The committee is unclear to the submitter's intent.

_______________________________________________________________________________________________22-109 Log #89


Revise the weld detail at the right to identify the dimension ‘t’ as the lesser of the reinforcing platethickness and the pipe wall thickness.

In the weld detail at the right, is ‘t’ intended to be the reinforcing plate thickness or the pipe wallthickness?

It is not the intent of the standard to specify the "t" dimension. It is up to the fabricationrequirements.




Revise the weld symbol to properly indicate the weld shown or revise the weld detail to match thesymbol.

The inside pipe-to-shell weld appears to show a full penetration weld with a fillet weld cap, but the weldsymbol calls for a fillet weld only.

The standard properly details the weld symbol for a full penetration weld with a fillet cap.

_______________________________________________________________________________________________22-111 Log #12


Revise text to read as follows:Make the following three changes to Figure B.1(q):(1) Change “6 in.” at the bottom of the figure to “1/2D or 6 in, whichever is greater”(2) Show the diameter of the pipe as “D”

These changes are necessary to make the figure match the requirements of NFPA 22. For large tanks,the distance will need to be greater than 6 inches.


22 F2012 ROP ballot

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