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API 653 Questions & Answers | 100% Correct | Verified 2024 API publications necessarily address problems of what type? - Problems of a general nature. (Special notes section) API Standard 653 covers in service steel tanks built to what standards? - This standard covers steel storage tanks buil...

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  • June 10, 2024
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API 653 Questions & Answers | 100%
Correct | Verified 2024
API publications necessarily address problems of what type? - ✔✔Problems of a general nature. (Special
notes section)



API Standard 653 covers in service steel tanks built to what standards? - ✔✔This standard covers steel
storage tanks built to API 650 and its predecessor API 12C. (1.1.1)



What API Standard always governs for tanks that have been placed in service? - ✔✔In the case of
apparent conflicts between the requirements of this standard and API 650 or its predecessor API 12C,
API 653 shall govern for tanks that have been placed in service. (1.1.2)



API Standard 653 employs the design principles of what standard? - ✔✔This standard employs the
principles of API 650. (1.1.3)



When design and construction details are not given and are not available in the standard to which the in
service tank was originally constructed, then details that will provide a level of integrity equal to the level
provided by the current edition of which standard must be used? - ✔✔The current edition of API 650
must be used. (1.1.5)



Who has the ultimate responsability for complying with the provisions of API653? - ✔✔The
owner/operator. (1.2)



The inspector agency of the jurisdiction in which the above ground is storage tank is operated is called
what? - ✔✔Authorized inspection agency (3.3)



An employee of an authorized inspection agency certified as an AST inspector per API 653 Appendix D, is
known as what? - ✔✔Authorized inspector (3.4)



What is the total metal loss divided by the period of time over which the metal loss occurred? -
✔✔Corrosion rate (3.9)

, What is the definition of a "repair" to a tank? - ✔✔Work necessary to maintain or restore a tank to a
condition suitable for safe operation. (3.24)



What must be done when the results of a tank inspection show that a change has occurred from the
original physical condition of that tank? - ✔✔An evaluation shall be made to determine its suitability for
continued use. (4.1.1)



What must be done when the cone roof tank roof plates corrode to an average thickness of less than
0.09" in any 100 in^2 area? - ✔✔Shall be repaired or replaced. (4.2.1.2)



What section of API 653 must be considered when changing the service of a tank to operation at
temperatures above 200F? - ✔✔All requirements of API 650, Appendix M. (4.2.4.3)



What form of corrosion does not normally represent a significant threat to the overall structural integrity
of the tank shell unless it is present in a severe and numerous form? - ✔✔Pitting (4.3.1.3)



When can widley scattered pits inside the tank shell be ignored? - ✔✔Provided that:

a) no pit depth results in the remaining shell thickness being less than one-half the minimum acceptable
tank shell

thickness exclusive of the corrosion allowance; and

b) the sum of their dimensions along any vertical line does not exceed 2 in. in an 8-in. length (see Figure
4.2). (4.3.2.2).



A tank of a single butt-weld with a back-up bar construction, built to an unknownstandard in 1940 is
inspected. Corrosion is general and an evaluation of the tank's minimum thickness is required. What
joint factor would you use? - ✔✔E = 0.85. (Table 4.2)



What can foundation settlement cause to appear in the shell of an AST? - ✔✔Shell distortions. (4.3.5.2,
4.3.5.3)

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