API 653 Final Exam Questions and Answers 2026

API 653 Final Exam Questions and Answers 2026

1. API 653 covers which of the following activities? a) Tank Design b) Tank Fabrication c) Tank Operation d) Tank Reconstrusction: d) Tank Reconstruction 2. Corroded roof plates on a fixed-roof tank shall NOT be less than: a) Designers Recommendation b) 0.090" thick averaged over any 100 sqin. c) 0.500" at any point. d) tmin averaged over critical length "L" Dimension: b) 0.90" thick averaged over any 100sqin. 3. A new nameplate shall be added to a tank after: a) either major alterations or tank reconstructions. b) either major alterations or tank reconstruction. c) it has been relocated. d) it has been reconstructed.: d) it has been reconstructed. 4. For a reconstructed tank, the shell thickness readings used to determine the allowable liquid height must have been taken within the last: a) 30 days. b) 60 days. c) 90 days. d) 180 days.: d) 180 days. 5. The impressed current sources of a cathodic protection system should be checked (to see if still operating) every: a) month b) two months. c) six months. d) year.: b) two months 6. Which of the following is part of the "critical zone"? a) the bottom within 3" of any roof support column b) the bottom within 3" of the shell c) the bottom 3" of the lowest shell course d) the frangible roof to shell weld: b) the bottom within 3" of the shell 7. A tank is 20 years old and has a bottom thickness of 0.170" original bottom thickness was 0.250. determine the interval for the next internal inspection? a) 10 years b) 15 years c) 17.5 years d) 20 years: c) 17.5 years 8. Widely catered pits in a tank shell can be ignored if the extent of the pitting does not exceed: a)2 pits in any 8 inches. b) 1 inch in any 8 inches. c) 2 inches in any 8 inches. d) 1 inch in any vertical 8 inches. e) 2 inch in any vertical 8 inches: e) 2 inch in any vertical 8 inches. 9. Which of the following is an advantage of the galvanic cathodic protection system? a) Annual maintenance costs are generally low. b) A single anode covers large surface areas c) the Effective life of the anodes is usually 50 years . d) It is easy to test the system's effectiveness.: a) annual maintenance costs are generally low 10. Hot taps are permitted: a) anywhere on the tank. b) anywhere on the tank provided the tank is gas free. c) only in the liquid section of tank. d) only in the liquid section of tank provided the product flash point is above 250*F.: c) only in the liquid section of tank. 11. An API 653 hydrotest shall be held for at least: a) 4 hours. b) 8 hours c) 12 hours d) 24 hours: d) 24 hours 12. During a tank repair, if API 653 conflicts with the design standard, which standard governs?