Study Guide API 653 with Complete Solutions

Study Guide API 653 with Complete Solutions API 653 covers which of the following activities? a) Tank Design b) Tank Fabrication c) Tank Operation d) Tank Reconstrusction - Correct Answer ️️ -d) Tank Reconstruction 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 - Correct Answer ️️ -b) 0.90" thick averaged over any 100sqin. 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. - Correct Answer ️️ -d) it has been reconstructed. 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. - Correct Answer ️️ -d) 180 days. 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. - Correct Answer ️️ -b) two months 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 - Correct Answer ️️ -b) the bottom within 3" of the shell 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 - Correct Answer ️️ -c) 17.5 years 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 - Correct Answer ️️ -e) 2 inch in any vertical 8 inches. 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. - Correct Answer ️️ -a) annual maintenance costs are generally low 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. - Correct Answer ️️ -c) only in the liquid section of tank. An API 653 hydrotest shall be held for at least: a) 4 hours. b) 8 hours c) 12 hours d) 24 hours - Correct Answer ️️ -d) 24 hours During a tank repair, if API 653 conflicts with the design standard, which standard governs? a) most stringent standard b) design standard c) API 653 d) either standard based on the inspector"s judgment - Correct Answer ️️ -c) API 653 Which of the following activities is considered an alteration in API 653? a) the addition of a shell lap patch b) the addition of a floor lap patch c) the addition of a shell insert patch d) the addition of 16 NPS nozzle e) the addition of a tank bottom lining - Correct Answer ️️ -d) the addition of 16 NPS nozzle Repaired or replaced bottom welds shall be examined with either a vacuum box or by using: a) tracer gas test b) radiographic and visual methods c) either magnetic particle or liquid penetrant methods d) a light diesel oil test - Correct Answer ️️ -a) tracer gas test Welding procedures for tank repairs to the shell should be qualified in accordance with: a) API 650 b) original construction standard c) ASME section IX d) AWS D1.1 - Correct Answer ️️ -C) ASME section IX A lap patch is installed on a tank bottom and the patch plate crosses a tank bottom weld. What is the minimum dimension for this patch plate? a) any size b) 6" c) 10" d) 12" - Correct Answer ️️ -d) 12" API 653 is intended to be used by owner/operator orga