178.50—Specification 4B welded or brazed steel cylinders.

Code of Federal Regulations

S = [P(1.3D2 0.4d2)] / (D2 − d2)
Where:
S = wall stress in psi;
P = minimum test pressure prescribed for water jacket test or 450 psig whichever is the greater;
D = outside diameter in inches;
d = inside diameter in inches.
[Amdt. 178-114, 61 FR 25942, May 23, 1996, as amended at 62 FR 51561, Oct. 1, 1997; 66 FR 45385, 45388, Aug. 28, 2001; 67 FR 51653, Aug. 8, 2002; 68 FR 75748, Dec. 31, 2003]