Understanding API ICP653 Reading 7-Worksheet-04 Part1

Q17. c (13.84") (Paragraph 4.3.2.1 Page 4-2)
L = 3.7 √(Dt2) L = 3.7√(112)(.125) L = 3.7 √ 14 L - 3.7(3.74) L = 13.84 inches
Q18. a (A repair is required.) Paragraph 4.3.2.2 Page 4-3)
Add the pit diameters 1”+ 1.25” + 1” + .500” = 3.75” (More than allowed in an
8” area) The pit depth exceeds one-half the minimum acceptable tank shell
thickness.
Q19. b (.463") (Paragraph B.3.3 Page B7)
R = Diameter divided by 2, in feet, 30” divided by 2 - 15” divided by 12 = 1.25
feet. B = .37R, B = .37 (1.25) B = .463 inches
Q20. d (The area should be documented and checked during the next
inspection.) Figure B-10, Page B-9 Using figure B-10 the area is acceptable,
it should be documented.
Charlie Chong/ Fion Zhang