API 653 EXAM CLOSED BOOK ACTUAL EXAM

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API 653 EXAM CLOSED BOOK ACTUAL EXAM

QUESTIONS AND CORRECT ANSWERS 2024 -2025

ALREADY GRADED A+

When is it necessary to install a new bottom plate over an existing bottom plate, a suitable ______ material cushion such as sand, gravel or concrete shall be used between the old bottom and the new bottom.

• drainage
• compacted
• Non-conductive
• Non-corrosive - ANSWER-D

How many settlement survey points are required for an AST that is 180 feet in diameter?

N=D/10

• 12
• 19
• 18

D) 10 - ANSWER-C

What welds do not require welder's identification? 1 / 4

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• All welds require identification
• Vertical welded joints which are located within the final shell course since this course will be

subjected to relatively low stresses

• Roof plate welds and flanges-to-Nozzle-neck welds
• Roof Plate welds and bottom plate welds - ANSWER-C

When shall measurements be taken to verify tolerances of reconstructed tanks?

• After hydrostatic testing
• Before hydrostatic testing
• After lay out of all plates
• After fit-up and tack welding used for alignment purposes - ANSWER-B

Under what condition may magnetic particle examination be performed on a part with a coating such as paint left on the part?

• It must be demonstrated, in accordance with Mandatory Appendix II, that indications can be

detected through the maximum coating thickness applied

• It must be demonstrated, in accordance with ASME Section VIII, Div 2, that indications can be

detected through the maximum coating thickness applied

• It must be demonstrated, in accordance with Mandatory Appendix I, that indications can be

detected through the maximum coating thickness applied 2 / 4

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• All coatings shall be removed prior to magnetic particle examination, the coatings could

mask discontinuities - ANSWER-C

A properly selected, applied, and maintained internal bottom lining proves leak prevention by____.

• Limiting internal corrosion of the steel tank bottom
• Creating a cathodic protection barrier on the internal surface
• Enhancing the effectiveness of the external cathodic protection system
• Limiting internal corrosion of the support columns and landings pads - ANSWER-A

Each welder and welding operator shall be assigned____.

• only one joint to ensure traceability
• An identifying number, letter, or symbol
• A specific welding machine
• Weld joints on only side of the tank - ANSWER-B

Soil corrosion appears as external thinning with localized losses due to:

• Grooving
• Acid Etching 3 / 4

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• Erosion
• Pitting - ANSWER-D

The use of oiled sand beneath tank bottoms does not eliminate the need for cathodic

protection and in fact may cause cathodic to be less effective because:

• the oiled sand has higher resistivity
• The sand is unable to conduct electrical current
• The oil acts as an insulator and block current flow
• The oil creates a vapor bearer entrapping water and contaminants next to the tank bottom. -

ANSWER-A

Welder qualification tests conducted by one manufacturer:

• Qualifies a welder or welding operator to do work for another manufacturer
• qualifies a welder or welding operator to do work for another manufacturer provided both

manufacturer are working in the dame tank farm

• Shall not qualify a welder or welding operator to do work for another manufacturer

D)Shall not qualify a welder or welding operator to do work for another manufacturer unless the welding procedures are identical - ANSWER-C

API 653 defines a "Storage tank engineer" as:

• A registered professional engineer in structural steel fabrication
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