TStE | = | maximum allowable working pressure, psi |
RFS |
where:
TS = ultimate tensile strength of shell plate, psi. When the tensile strength of the steel plate is not known, it shall be taken as 55,000 psi for temperatures not exceeding 700°F.
t = minimum thickness of shell plate of weakest course, inches
E = efficiency of longitudinal joint depending upon construction. Use the following values:
For riveted joints -- calculated riveted efficiency;
For fusion-welded joints:
Single lap weld | 40% |
Double lap weld | 50% |
Single butt weld | 60% |
Double butt weld | 70% |
Forge weld | 70% |
Brazed steel | 80% |
R = inside radius of weakest course of shell, inches, provided the thickness does not exceed 10% of the radius. If the thickness is over 10% of the radius, the outer radius shall be used.
FS = factor of safety allowed by this chapter.
16 Va. Admin. Code § 25-50-380
Statutory Authority: § 40.1-51.6 of the Code of Virginia.