API 653 EXAM 4 QUESTIONS AND CORREC ANSWERS 100%

API publications necessarily address problems of what type? - ANSWERS Problems of a general nature. (Special notes section) API Standard 653 covers in service steel tanks built to what standards? - ANSWERS 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? - ANSWERS 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? - ANSWERS 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? - ANSWERS The current edition of API 650 must be used. (1.1.5) Who has the ultimate responsability for complying with the provisions of API653? - ANSWERS The owner/operator. (1.2) The inspector agency of the jurisdiction in which the above ground is storage tank is operated is called what? - ANSWERS 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? - ANSWERS Authorized inspector (3.4) What is the total metal loss divided by the period of time over which the metal loss occurred? - ANSWERS Corrosion rate (3.9) What is the definition of a "repair" to a tank? - ANSWERS 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? - ANSWERS 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? - ANSWERS 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? - ANSWERS 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? - ANSWERS Pitting (4.3.1.3) When can widley scattered pits inside the tank shell be ignored? - ANSWERS 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).