Api650653questionsclosedbookwithanswers 150501143902 Conversion Gate02

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API 650 & 653

PRACTICE QUESTIONS (CLOSED BOOK)

1. Pick the correct manual welding rod that must be used to make Hot Taps or for

reconstruction of above ground storage Tanks. E7018

2. The new nameplate for a reconstructed API 6! tank shall be placed"

Adjacent to existing nameplate.

!. #adiographs for reconstructed tanks shall be" Retained for at least 1 year.

$. It is not necessar% to consider the possibilit% of brittle fracture of a tank if thefollowing e&ists. The tank shell thickness is"

Less than/eqal !"/#$ %&' the tan( operates o)er *0+ or the mem,rane stress of

the tan( is ,elo- 7000psi.

. The following welds do not need a welder identification. Roof plate -elds and flangetonole nec( -elds.

6. #oof plates of an aboveground storage tank shall be repaired or replaced if the

average thickness of the plates have corroded to" Less than 0.0& in any 100 sqare inch area.

'. If the re(uirements of a )urisdiction are more stringent than the re(uirements of API6!* then the re(uirements of"

he jrisdiction shall go)ern.

+. Aboveground storage tanks are primaril% inspected to"

Ensre the safety and integrity of the tan(s.,. Atmospheric storage tanks are defined as tanks that are designed to withstand an

internal pressure"

2p to ,t not exceeding 3.4 psi gage.

1-. Three t%pes of e&ternal inspections of above ground tanks are" Rotine inser)ice inspections' formal )isal external inspection' and inser)ice

2 thic(ness measrements of the shell.

11. hen corrosion rates are not known* tank bottom actual thickness shall bedetermined b% inspection within the ne&t ////// %ears of tank operation to establish

corrosion rates.

1012. A $+0 high b% 1--0 diameter aboveground storage tank is checked for outof

plumbness. The permissible outofplumbness was found to be"

4&

1!. A hot tap is installed on an aboveground storage tank. A reinforcing plate has beenwelded to the shell and pneumaticall% tested per API 6-. After the valve has been

installed on the hot tap nole* a pressure test is performed on the nole prior to

mounting the hot tap machine. hat pressure is used3

1.4 times the hydrostatic head.

1



API 650 & 653


1$. A new tank is placed in service. In seven 4'5 %ears the following inspections should

have been made" Rotine )isal' formal )isal !external$' and 2 inspections.

1. API 6! specifies what temperature for preheat on plate thickness over 1.3

300+

16. #outine visual inservice inspections of aboveground storage tanks from the groundma% be done b%"

5-ner / ser personnel other than athoried inspectors.1'. A formal visual e&ternal inspection b% an authoried aboveground storage tank

inspector shall be made at least ever% ///// %ears or at #7A8$9 %ears* whichever is

less.

41+. :&ternal* ;T measurements of a new tank shell shall be made not later than /////

%ears after commissioning.

41,. In no case shall the internal inspection interval of an aboveground storage tank

e&ceed ///// %ears.30

2-. A tank built new in <anuar%* 1,++ was removed from service and internall% inspected

<anuar%* 1,,+. The bottom course of the tank showed the most general corrosion 4no

isolated corrosion was found5. The original thickness of the bottom course of the tankwas 1. The measured thickness of the bottom course at the inspection was -.,!.

=etermine the corrosion rate.

0.0070&/year

21. hen a full% h%drostatic test is re(uired* it shall be held for //// hours.36

22. A full h%drostatic test is alwa%s re(uired on"

A reconstrcted tan(.2!. The ma&imum acceptable undercutting on horiontal butt welds of a reconstructed

tank is ///// inch.

1/32$. The minimum number of settlement points around a tank peripher% is"

8

2. The ma&imum spacing of settlement points is ///// feet around the circumference.

326. hich of the following is not considered shell distortion3

2niform settlement of a tan(.

2'. If an% provision of API 6! presents a direct or implied conflict with an% statutor%

regulation and the statutor% regulation is more stringent"he go)ernment reglations go)ern.

2+. If a contractor is to relocate or reconstruct an aboveground storage tank* the limits ofresponsibilities are defined b%"

he o-ner / operator.

2



API 650 & 653


2,. If a weld is made on a tank shell plate that is thicker than 1 inch* the base metal

within ! inches of the welding shall be heated to a temperature of appro&imatel%"160+

!-. idel% scattered pits ma% be ignored provided /////// and the sum of their

dimensions along an% vertical line does not e&ceed 2 in an + length.

o pit depth is greater than % tmin exclsi)e of the corrosion allo-ance.!1. The critical one is that portion of the bottom or annular plate with in"

& of the inside edge of the shell measred radially in-ard.!2. The following repairs are allowed within the critical one of repair of a tank bottom"

9elding of -idely scattered pits' pinholes' and crac(s in the ,ottom plate.

!!. In addition to API 6- re(uirements* API 6! re(uires that ///// radiograph4s5 is8are

re(uired for a repaired vertical weld )oint.5ne

!$. hen a weld fails #T* how man% additional radiographs are re(uired3

-o spots adjacent to the naccepta,le -eld section shall ,e R:d.!. ith a horiontal sweep board !6 long* peaking shall not e&ceed ///// inch.

0.400&!6. A $+0 high tank has a diameter of 12'0. hat is the ma& outofplumbness allowed3

4.0&

!'. hat is the main factor in determining the efficienc% of a rivet )oint in a tank3

he nm,er of ri)et ro-s.!+. A new 1--0 diameter tank must have at least ///// inches thick shell plates.

;&

!,. elders are (ualified to what standard or code3

<ection => of A<?E @ode$-. #adiographs of repaired work and records of radiographs of repaired work shall be

marked with"

he letter R&.$1. All leaks in pontoons or compartments of double deck floating roofs shall be repaired

b%"

Re-elding the lea(ing joints and/or the se of patch plates.$2. Acceptance criteria for a radiograph of a repaired on a tank is found"

<ection B=== of the A<?E @ode.

$!. API >tandard 6! re(uires new welds of shell to bottom plate to be inspected"

heir entire length ,y rightangle )acm ,ox and soltion film or ,y applyinglight diesel oil.

$$. An internal inspection interval for above ground storage tanks must not be greater

than"

30 years.$. ;T measurements are re(uired on a tank shell* how man% measurements shall be

taken"5-ner / operator jdgment.

$6. 9on homogeneous fill* such as a lump of cla% in the sand of a foundation pad under

the tank bottom is one factor that"

@an case corrosion and tan( ,ottom lea(age.

!



API 650 & 653


$'. #T procedures to satisf% the re(uirements of API 6! should be evaluated in

accordance with" A<?E @ode' <ection B.

$+. 9ewl% welded bottom )oints shall be tested using a vacuum bo& and solution film or

b% means of"

racer gas and detector examination.$,. A tank has a shell corrosion rate of mils per %ear and a remaining corrosion

allowance of -.1'. ?or this tank* the ma&imum interval for service ;T thicknessmeasurements is"

14 years.

-. ?ormal in service visual e&ternal inspection must be conducted b%"

An inspector qalified in accordance -ith AC= *4.1. ;T testing inspection of the shell plate for laminations in the affected area is

mandator% when"

A reinforcement plate is added to an existing nreinforced shell penetration.2. hich t%pe of repair of a crack is allowed in the tank shell to tank bottom weld3

Remo)e the entire crac( and repair the -eld.!. hen e&ternal ultrasonic thickness measurements are used to determine a rate of

general uniform corrosion relevant to the integrit% of new tank shell and the rate of

corrosion is not known* what is the ma&imum interval for ultrasonic thickness

measurements3

4 years.$. hen preparing a tank prior to installing a replacement bottom over an e&isting

bottom* the tank shell must be separated from the tank bottom b% cutting the shell

parallel to the tank bottom a minimum of ////////// above the bottomtoshell weldor b% removing the entire shelltobottom weld and the HA@ b% gouging or grinding.

%&

. =istortion of anchor bolts and e&cessive cracking of the concrete structures in whichthe anchor bolts are embedded ma% be indications of"

5)er pressre p lift condition.

6. uidance for evaluation of an e&isting e&ternal floating roof shall be based on criteriain"

AC= *40 appendix @.

'. The recommended procedure for accessing the risk of failure due to brittle fracture is

based on" A decision tree analysis and appropriate factors.

+. Penetrations installed using insert plates shall have the buttweld e&amined b% means

of"

+ll radiograph.,. 7ertification that the tank has been reconstructed in accordance with API 6! is

normall% done b%" Reconstrction organiation.

6-. All the following must be included in a general inspection report e&cept"

5perating history of the tan(.61. ho has the ultimate responsibilit% for compl%ing with the provisions of API 6!3

5-ner / 5perator.

$



API 650 & 653


62. #adiographs taken of a reconstructed tank shall be retained"

5ne year.6!. ?or tanks to be reconstructed* all shell plate materials and bottom plates welded to the

shell shall be identified. Baterial not identified shall be"

ested and identified ,y chemical analysis and mechanical test as reqired ,y

A<? A* and A70 inclding @harpy Bnotch test.6$. =uring h%drostatic tests of repaired or reconstructed tanks foundation settlement shall

be measured during filling and when water reaches what percentage of the test level3100D

6. ith regard to a full h%drostatic test of a tank* the correct statement below is that this

test"

=s al-ays reqired for major repairs/alterations nless special reqirements of AC= *4 are follo-ed.

66. The ma&imum vertical and horiontal dimension of a lapped patch repair plate is

//// C //// inches respectivel%.68& 73&

6'. 7ompleted welds of stress relieved assemblies of shell penetrations shall be e&amined b% visual and BT or PT methods"

After stress relief and ,efore the hydrostatic test.

6+. If it necessar% to replace a roof rim* the new roof rim shall be a minimum thickness

of"

/1*&6,. #immounted primar% shoe seals and toroidal seal s%stems can be removed* repaired*

or replaced. To minimie evaporation losses and reduce potential haards to workers*

no more than"1/6 of the roof seal system shold ,e ot of an inser)ice tan( at one time.

'-. elding procedure specification 4P>5* and welders and welding operators shall be

(ualified in accordance with"<ection => of the A<?E @ode.

'1. hen a tank is reconstructed* each welder and welding operator shall be assigned"

An identifying nm,er' letter' or sym,ol.'2. hen a tank is reconstructed* in lieu of other means of identification* the welder or

welding operator0s identification mark shall be hand or machine stamped ad)acent to

and at intervals along the completed weld not e&ceeding"

: along completed -elds.'!. Acceptable settlement ma% be determined as described in Appendi& D of API

>tandard 6!. An alternate to this is"

A rigoros stress analysis of the tan( may ,e carried ot.

'$. The minimum dimension of a lapped patch repair plate is"*&

'. The thickness to be used for each shell course when checking the design for areconstructed and relocated tank shall be based on measurements taken within /////

da%s prior to relocation.

180



API 650 & 653


'6. The pro)ection of the bottom plate be%ond the outside toe of the shelltobottom weld

shall be at least //// inch.0.740

''. In lieu of stamping complete welds"

A record may ,e (ept that identifies the -elder or -elding operator employed for

each -elded joint.'+. If a tank shell has a thickness no greater than ///// the risk of failure due to brittle

fracture is minimal* provided that an evaluation for suitabilit% of service per section 2of API 6! has been performed.

0.400&

',. here concrete ringwalls are provided under the shell* the top of the ringwall shall be

level within //// in an% !-0 of the circumference measured from the averageelevation.

Cls or mins 1/8&.

+-. hen design and construction details are not given and are not available for a tank*then details that will provide a level of integrit% e(ual to the level provided b% the

current edition of /////// must be used. AC= <tandard *40

+1. :&cess settlement during a h%drotest shall be cause to"

<top the test for fondation in)estigation and / or repair.

+2. Impact testing is not re(uired for a design temperature of"

Freater than *0+.+!. here concrete ring walls are provided under the shell* the top of the ringwall shall

be level within E8 ///// inch in an% !-0 of circumference and E8 ///// inch in the

total circumference measured from the average elevation.1/8& and ;&

+$. The measurement for internal bottom settlement shall have ma&imum of ///// feet

spacing between elevation points across the diameter310

+. 7ompleted welds of stress relieved assemblies shall be e&amined b% ///////* after

stress relieving* but before h%drotest.B ? or C

+6. #epaired shell vertical )oints shall have ////// radiograph taken in ever% )oint.

1

+'. A name plate for a reconstructed tank shall have" Gesign condition listed

++. The minimum length of readable #T film according to API 6! is3

*&

+,. hen the corrosion rate of a tank is known the interval between taking ;T thicknessmeasurements shall be the smaller of #7A829 or"

14 years.,-. If the corrosion rate is not known* what is the inservice ;T interval3

4 years.

,1. eneral inspection reports shall include"

?etal thic(ness measrements' conditions fond' repairs' any settlementmeasrements' and recommendations.

6



API 650 & 653


,2. Peaking shall not e&ceed F when measured with"

A horiontal s-eep ,oard *& long and made to the tre otside radis of thetan(.

,!. #outine inservice inspection includes"

Bisally chec(ing the exterior tan(:s srface for lea(s' shell distortions' signs of

settlement' signs of corrosion' condition of fondation' condition of paint'condition of inslation system' and condition of apprtenances.

,$. hich of the following is an alteration3 Addition of a 16& diameter nole.

,. 7orroded roof plates shall be repaired or replaced* when the"

A)erage thic(ness is less than 0.0& in a 100 sqare inch area.

,6. H%drostatic test stress for a new tank is based upon"he lesser of H the yield stress or /7 the minimm tensile stress of the tan(:s

material of constrction.

,'. If the number of elevation measurement points is determined b% 9 G =81-* how man%measurement points are necessar% on a - feet diameter tank3

8,+. The )oint between the new material of an insert plate and the old material of the

e&isting tank shell plate shall be"

Itt -elded.

,,. It has been determined that G!2 in a corroded area of a tank 120 in diameter and$-0 high. >i&teen ;T readings are taken ever% 2 over the length of . The readings

are as follows" -.$2* -.!2* -.!+* -.!-* -.2+* -.2* -.26* -.2* -.2!* -.2,* -.26* -.!1*

-.!'* -.!$* -.!!* and -.!,. =etermine t14tavg5. #ound to the nearest hundredth.

0.1&1--. The critical one for repairs to tank bottoms is that portion of the bottom or

annular plate within ////// of the inside edge of the shell* measured radiall% inward.

&s

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Api650653questionsclosedbookwithanswers 150501143902 Conversion Gate02

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