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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)
Authorized inspector. The interval of such inspections shall not exceed how many months? - ✔✔The interval of such inspections shall be consistent with conditions at the particular site, but shall not exceed one month. (6.3.1.2) External ultrasonic thickness measurements of the shell, when used and when the corrosion rate is not known, are taken at intervals not to exceed how many years? - ✔✔When the corrosion rate is not known, the maximum interval shall be five years. (6.3.3.2) Who assures the quality and completeness of NDE results obtained during a formal internal inspection of an in service AST? - ✔✔The authorized inspector (6.4.1.2) The initial internal inspection interval for an AST shall not exceed how many years (excluding RBI analysis)? - ✔✔10 years (6.4.2.1) Name the three types of records the owner/operator is required to keep for AST's - ✔✔Construction records, inspection history, and repair/alteration history. (6.8.1) If existing plates are to be used to reconstruct a tank, the plates shall be checked for what conditions? - ✔✔They shall be checked for excessive corrosion and pitting (see Section 4 and Section 6). (7.3.4) New weld joint details on a reconstructed tank shall meet the welding requiremnts of what standard? - ✔✔Weld joint details shall meet the welding requirements of the current applicable standard. (8.2.1) Shell penetrations on reconstructed tanks shall be designed, detailed, welded and examined to meet the requirements of what standard? - ✔✔Replacement and new penetrations shall be designed, detailed, welded, and examined to meet the requirements of the current applicable standard. (8.5.1) All repair work on an AST must be authorized by whom before commencement of work? - ✔✔By the authorized inspector or an engineer experienced in storage tank design (9.1.3) The minimum dimension for a replacement shell plate is? - ✔✔12 in. or 12 times the thickness of the replacement
plate, whichever is greater. (9.2.2.1) Are lap patch shell repairs permitted at all in API 653? - ✔✔Lapped patch shell repairs are an acceptable form of repair for butt-welded, lap-welded, and riveted tank shells, under the conditions outlined in 9.3.2, 9.3.3, and 9.3.4 (9.3.1) Lapped patch plates shall not have a thickness less than how many inches? - ✔✔Smaller of 1/2" or thickness of plate adjacent to repair, but not less than 3/16" (9.3.1.3) What is the maximum vertical and horizontal dimension of a lapped patch repair plate per API 653? - ✔✔48" x 72" = 4ft x 6 ft. Min is 4". (9.3.1.7) What NDE techniques must be applied prior to application of a lapped patch shell repair? The areas to be wleded shall be checked for plate defects and remaining thicknesses. - ✔✔Ultrasonic (9.3.1.9) When a reinforcement plate is used with a penetration, the minimum diameter of the insert plate shall be determined how? - ✔✔The minimum diameter of the insert plate shall equal the diameter of the reinforcing plate plus 12 in. (9.8.6b) What is the minimum dimension of a welded-on patch plate that overlaps a bottom seam on a tank? bottom? - ✔✔12" (9.10.1.1a) What is the maximum thickness of a welded-on patch plate that is used to make a bottom repair within the critical zone? - ✔✔1/4" (9.10.1.2a) What are some examples of a suitable non-corrosive material cushion that shall be used between an old and a new tank bottom? - ✔✔Sand, gravel, concrete. (9.10.2.1.1) What method of repair is acceptable for external floating roofs? - ✔✔Any method that will restore to a condition to perform as required (9.12.1)
For AST's what NDE technique shall be used to check completed welds attaching nozzle neck to shell, and reinforcing plate to shell and to nozzle neck? - ✔✔Mag particle or liquid penetrant (12.1.2.3) An inspector is responsible for inspecting a new shell plate that is joined to another new shell plate. What inspection method(s) is/are required by API 653? - ✔✔Radiography (12.1.5.2) Upon completion of a welding on a tank bottom, the plates and the entire lenght of new welds for tank bottom plates shall be examined by what NDE technique to check for any potential defects and leaks? - ✔✔Visually (12.1.7.1) Repaired vertical joints in existing shell plates shall have how many additional radiographs taken at each joint? - ✔✔One aditional at each joint( 12.2.1.1.2) What is the minimum number of radiographs required, when a new or replacement circular insert plate is butt welded to the shell? - ✔✔A minimum of 1 radiograph (12.2.1.6.1) If you see a "R" on a radiograph and radiograph records of repaired welds, what does the "R" signify? - ✔✔Whats the question? (12.2.3.2) When a reconstructed tank and any tank that has undergone major repairs or major alterations, it shall have a full hydrostatic test. How long is that hydrostatic test held (hrs)? - ✔✔24hrs (12.3.1) What steps and documentation is required by API 653 in order to exempt a major repair or alteration of a tank from hydrostatic testing? - ✔✔Engineer and owner/operator must authorize in writting (12.3.2.2) When tanks are recosntructed in accordence with API 653, what attachment is required to be attaced to the tank? - ✔✔A corrosion resistant metal nameplate with reconstructed data (13.1.1.1) When should a monitoring program to determine the effects of settlement on storage tanks be initiated?
- ✔✔At onstruction and continued during hydrostatic testing and operation (B1.1)
What steps should be taken if at any time the settlement of a tank is deemed to be excessive? - ✔✔Empty and re-level (B1.2) When taking tank settlement readings internally accross the bottom of a tank (tank is OOS), what is the maximum spacing of the points along the tank diameter? - ✔✔32ft spacing (Fig B.2) What type of settlement (more than all the others) should be evaluated to ensure the structural integrity of the shell and bottom of the tank? - ✔✔Out of plane settlement (B2.2.4) An API 653 inspector must satisfy the API criteria for education and experience. How many years experience is required if the inspector has a high school diploma? - ✔✔3 years (D2.1.1) After an inspector has been certified, the inspector must demonstrate knowladge if revisions to API 653 after how many years from the inpector's initial certification date? - ✔✔6 years (D.5.3)
