Course Objective Exercise

7/25/2019 Course Objective Exercise

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Note: The source of the technical material in this volume is the ProfessionalEngineering Development Program (PEDP) of Engineering Services.

Warning: The material contained in this document was developed for SaudiAramco and is intended for the exclusive use of Saudi Aramcos employees.Any material contained in this document which is not already in the publicdomain may not be copied, reproduced, sold, given, or disclosed to thirdparties, or otherwise used in whole, or in part, without the written permissionof the Vice President, Engineering Services, Saudi Aramco.

Chapter : Mechanical For additional information on this subject, contactFile Reference: MEX-203.09 PEDD Coordinator on 874-6556

Engineering Encyclopedia

Saudi Aramco DeskTop Standards

COURSE OBJECTIVE EXERCISE


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Engineering Encyclopedia Evaluating Storage Tank Design and Installation

Course Objective Exercise

Saudi Aramco DeskTop Standards i

Section Page

INTRODUCTION............................................................................................................. 2

WORK AID 1: PROCEDURE FOR DETERMINING WHETHER ACONTRACTOR DESIGN PACKAGE FOR A NEW ATMOSPHERIC STORAGETANK MEETS SAUDI ARAMCO REQUIREMENTS....................................................... 3

WORK AID 2: PROCEDURE FOR DETERMINING THE NECESSARY REPAIROR ALTERATION REQUIREMENTS FOR AN EXISTING ATMOSPHERICSTORAGE TANK .......................................................................................................... 13


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Saudi Aramco DeskTop Standards 2

INTRODUCTION

Previous modules covered the material that is necessary forParticipants to achieve the overall course objective. This module

does not present any new technical material. Instead, thismodule provides Participants with the opportunity to apply thematerial that was discussed during the course to solve actualwork tasks. The work tasks used in this module are provided bythe Participants and consist of either an atmospheric storagetank Contractor Design Package or an atmospheric storage tankInspection and History Report. The typical content of theseitems was discussed in earlier modules.

In these Exercises, typical work tasks that are provided byParticipants will be solved through the use of the knowledge thatwas gained during the course. Participants have brought to

class either an atmospheric storage tank Contractor DesignPackage or an Inspection and History Report. Each Participantwill individually complete either Exercise 1 or Exercise 2,depending on the type of information that he has brought toclass.


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WORK AID 1: PROCEDURE FOR DETERMINING WHETHER ACONTRACTOR DESIGN PACKAGE FOR A NEWATMOSPHERIC STORAGE TANK MEETS SAUDI

ARAMCO REQUIREMENTSThis Work Aid provides an overall procedural summary of the steps that are required inorder to review a Contractor Design Package for a new atmospheric storage tank. TheWork Aid highlights the information that must be obtained and reviewed, and referencesappropriate prior modules and Work Aids for additional information. Note that reviewersmust always look for information that may be missing from the packages that theyreview. Reviewers also cannot assume that this Work Aid contains everything thatshould be checked. Participants must also use their own experience, prior reviews thatthey have made, problems that they have seen, and anything else that may be useful inperforming their evaluations.

1. Identify the information that is contained in the Contractor Design Package that isto be reviewed, to determine if the information is complete. The Contractor DesignPackage should include at least the following items:

Tank Data Sheet and Form 2696.

Fabrication drawings for all tank components, such as the shell, roof, bottom,wind girder, and nozzles.

Material specifications for all tank components.

Inspection requirements.

Hydrotest requirements.

Original design calculations for all tank components.

Vent and fire protection system details.

Completed Safety Instruction Sheet, Form 2693.


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2. Gather all the industry and Saudi Aramco reference material that must be used toevaluate the Contractor Design Package. This reference material includes thefollowing items:

API-650

API-2000

SAES-D-100

SAES-A-004

SAES-A-005

SAES-B-007A

SAES-B-007B

SAES-W-001

32-SAMSS-005

3. Identify the specified design conditions and fluid service.

Design Metal Temperature, C (F)

Maximum Operating Temperature, C (F)

Design Pressure, kPa (psig)

Stored Fluid

Flash Point, C (F)

Corrosion Allowance, mm (in.)


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4. Determine if the specified design conditions and loadings that are summarized inStep 3 meet Saudi Aramco requirements. Refer to MEX 203.02, Work Aid 1, andMEX 203.02.

5. Determine if the specified materials meet Saudi Aramco material selectionrequirements. Refer to MEX 203.02, Work Aid 1. Use the table that follows torecord the specified information and your conclusions.

Tank Specified MaterialAcceptable

Component SpecificationYes No

Shell

Roof

Bottom

Annular Plate

Roof Support

Roof Support Structures

Nozzle Necks

Flanges

Bolting

Reinforcement


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6. Determine if the specified shell material allowable stresses are acceptable. Referto MEX 203.02, Work Aid 1. Use the table that follows to record the specifiedinformation and your conclusions.

ShellCourse

SpecifiedMaterials

Specified AllowableStress kPa (psi) Acceptable

Design Hydrotest Yes No

1

2

3

4

5

6

7

8

9

10


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7. Determine if the specified shell course thicknesses are acceptable. Refer to MEX203.03, Work Aid 1. Use the table that follows to record the specified informationand your conclusions.

Shell Specified ThicknessAcceptable

Course mm (in.)Yes No

1

2

3

4

5

6

7

8

9

10


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8. Is this an external floating roof tank?

Yes No

If "Yes," proceed with this step. If "No", go to Step 9.

Is a top wind girder specified?

Yes No

If "No," this is unacceptable.

If "Yes," confirm that the section modulus of the top wind girder is acceptable.Refer to EX 203.03, Work Aid 2.

Is an intermediate wind girder specified?

Yes No

If "Yes," confirm that its section modulus and location are acceptable. If "No,"confirm that an intermediate wind girder is not required. Refer to MEX 203.03,Work Aid 2.


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9. Determine if the specified details for opening design are acceptable. Refer to MEX203.03, Work Aid 3. Use the table that follows to record the specified informationand your conclusions.

Opening Size, mm Height Above

ReinforcementSize, mm (in.)

Acceptable

Number (in.) Bottom, mm (in.)Length Width Yes No


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10. Is this an external floating roof tank?

Yes No

If "Yes," proceed with this step. If "No," go to Step 11.

Confirm that the buoyancy and other roof design requirements have been met.Refer to MEX 203.03, Work Aid 4. Go to Step 12.

11. Has emergency venting been specified (fixed roof tank)?

Yes No

If "No," proceed with this step. If "Yes," go to Step 12.

Identify the following information:

Roof attachment fillet weld size, mm (in.)

Top angle size, mm (in.)

Length Width Thickness

Confirm that the roof-to-shell joint is frangible. Refer to MEX 203.03, Work Aid 4.

12. Determine if the specified thickness of the roof is acceptable. Refer to MEX203.03, Work Aid 4.

Specified roof thickness, mm (in.)

Acceptable? Yes No

13. Determine if the specified thickness of the bottom is acceptable. Refer to MEX203.03, Work Aid 5.

Specified bottom thickness, mm (in.)

Acceptable? Yes No

14. Has a butt-welded annular plate been specified?

Yes No

If "No," is this acceptable? Refer to MEX 203.03, Work Aid 5.

If "Yes," identify the following information for the annular plate:

Thickness, mm (in.)


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Projection outside of shell, mm (in.)

Distance to nearest lap-welded bottom plate, mm (in.)

Determine if the specified annular plate dimensions are acceptable.15. Determine if the fabrication details for the storage tank are acceptable. Refer toMEX 203.04, Work Aid 1. As a minimum, check the following items:

Shell circumferential weld details.

Shell longitudinal weld details.

Nozzle attachment weld details.

Bottom lap weld details.

Annular plate butt-weld details.

Shell-to-bottom attachment detail.

Roof-to-shell attachment detail.

References to appropriate weld procedure and welder qualificationrequirements.

References to appropriate fabrication tolerances.

16. Determine if the specified inspection and testing plans are acceptable. Refer toMEX 203.05, Work Aids 1 and 2. The following checklist may be used to assist inthis determination:

Extent of shell radiography specified:

Consistent with shell thicknesses?

Yes No

Other specified inspections:

Acceptable? Yes No

Confirm that a full height hydrotest has been specified.


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17. If this is a fixed roof tank, proceed with this step. If this is an external floating rooftank, go to Step 18.

a. Confirm that pressure/vacuum vents have been provided and that they are

sized in accordance with API-2000 for the maximum tank filling and emptyingrates. Refer to MEX 203.06.

b. Has a frangible joint been provided (See Step 11)?

Yes No

If "No," confirm that emergency venting has been provided in accordance with API-2000. Refer to MEX 203.06.

18. If this is an external floating roof tank, confirm that bleeder vents and rim ventshave been provided. Refer to MEX 203.06.

19. Confirm that the specified fire-protection system is acceptable. Refer to MEX203.06, Work Aid 1.

20. Determine if the Safety Instruction Sheet has been correctly completed. Refer toMEX 203.07.


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WORK AID 2: PROCEDURE FOR DETERMINING THE NECESSARYREPAIR OR ALTERATION REQUIREMENTS FOR ANEXISTING ATMOSPHERIC STORAGE TANK

This Work Aid provides an overall procedural summary of the steps that are required inorder to review the Inspection and History Report for an existing atmospheric storagetank. The Work Aid highlights the information that must be obtained and reviewed andreferences appropriate Work Aids that are contained in MEX 203.08. Note thatreviewers must always look for information that may be missing from the reports thatthey review. Reviewers also cannot assume that this Work Aid contains everything thatshould be checked. Participants must also use their own experience, prior reviews thatthey have made, problems that they have seen, and anything else that may be useful inperforming their evaluations.

1. Gather the information that is identified in Steps 1 through 3 and Steps 5 through

14 of Work Aid 1, at least for the portions of the storage tank that will be evaluated.Note that, if it is desired to change the maximum fill height, internal pressure,maximum operating temperature, or design metal temperature of the storage tank,these new conditions must be identified. Also obtain copies of SAES-D-108 and

API-653.

2. Identify the following additional information:

The year the tank was placed into operation

Any changes in service and when these changes occurred:

Service Year

3. Review the Inspection and History Report that has been provided, and identify thefollowing:

Specified initial and subsequent external inspection intervals.

Changes that have been made to the subsequent inspection intervals and thereasons for the changes.

Repairs or alterations that have been made to the storage tank, includinginformation on when and why these modifications were made.

Defects or deterioration in the storage tank that have been noted in theinspection report. Use the following to assist in gathering the necessaryinformation:

Cracks

+ Location

+ Length


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+ Depth


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General Corrosion in Shell

+ Location

+ Length and Width, mm (in.)

+ Remaining Thickness, mm (in.)

Pitting in Shell

+ Location

+ Maximum length in 200 mm (8 in.)distance

+ Maximum Depth

General Corrosion in Bottom

+ Location

+ Maximum Depth, mm (in.)

Topside Pitting in Bottom

+ Location


+ Average Depth, mm (in.)

Underside Pitting in Bottom

+ Location


+ Average Depth, mm (in.)

4. Based on the information that was determined in Steps 1 through 3, determine theappropriate initial and subsequent external and internal inspection frequencies.Refer to MEX 203.08. Note that it may be necessary, based on the information that

is contained in the Inspection and History Report, to adjust the subsequentinspection frequencies that were originally specified.

5. Based on the information that was determined in Steps 1 through 4, determine ifthe storage tank shell is suitable for continued service in view of the corrosionand/or other deterioration that has been reported. Refer to MEX 203.08,Work Aid 1.


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6. Based on the information that was determined in Steps 1 through 4, determine ifthe storage tank bottom is suitable for continued service, in view of the corrosionand other deterioration that has been reported. Refer to MEX 203.08, Work

Aid 2.

7. Determine if the condition of the roof is suitable for continued operation. Refer toMEX 203.08, Work Aid 3.

8. Has any differential shell settlement or bottom settlement been reported?

Yes No

If "Yes," determine if the reported settlement is acceptable for continued operation.

Refer to MEX 203.08, Work Aid 4.

9. If Steps 5, 6, 7, or 8 determine that the storage tank is not suitable for continuedoperation at the desired design conditions, determine the appropriate design andfabrication details for any repairs or alterations that are required. Refer to MEX203.08 and its Work Aids 1, 2, 3, or 4.

Course Objective Exercise

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