TABLE 1-AUTHORIZED MATERIALS
Stainless steels | |||
304 (percent) | 321 (percent) | 347 (percent) | |
Carbon (max) | 0.08 | 0.08 | 0.08 |
Manganese (max) | 2.00 | 2.00 | 2.00 |
Phosphorus (max) | .030 | .030 | .030 |
Sulphur (max) | .030 | .030 | .030 |
Silicon (max) | .75 | .75 | .75 |
Nickel | 8.0/11.0 | 9.0/13.0 | 9.0/13.0 |
Chromium | 18.0/20.0 | 17.0/20.0 | 17.0/20.0 |
Molybdenum | |||
Titanium | (1) | ||
Columbium | (2) |
1Titanium may not be more than 5C and not more than 0.60%.
2Columbium may not be less than 10C and not more than 1.0%.
TABLE 2-CHECK ANALYSIS TOLERANCES
Element | Limit or maximum specified (percent) | Tolerance (percent) over the maximum limit or under the minimum limit | |
Under minimum limit | Over maximum limit | ||
Carbon | To 0.15 incl | 0.01 | 0.01 |
Manganese | Over 1.15 to 2.50 incl | 0.05 | 0.05 |
Phosphorus1 | All ranges | .01 | |
Sulphur | All ranges | .01 | |
Silicon | Over 0.30 to 1.00 incl | .05 | .05 |
Nickel | Over 5.30 to 10.00 incl | .10 | .10 |
Over 10.00 to 14.00 incl | .15 | .15 | |
Chromium | Over 15.00 to 20.00 incl | .20 | .20 |
Titanium | All ranges | .05 | .05 |
Columbium | All ranges | .05 | .05 |
1Rephosphorized steels not subject to check analysis for phosphorus.
S = PD / 4tE
Where:
S = Wall stress in psi;
P = Test pressure prescribed for water jacket test, i.e., at least two times service pressure, in psig;
D = Outside diameter in inches;
t = Minimum wall thickness in inches;
E = 0.85 (provides 85 percent weld efficiency factor which must be applied in the girth weld area and heat zones which zone must extend a distance of 6 times wall thickness from center of weld);
E = 1.0 (for all other areas).
S = [P(1.3D2 + 0.4d2)] / (D2 - d2)
Where:
S = Wall stress in psi;
P = Test pressure prescribed for water jacket test, i.e., at least two times service pressure, in psig;
D = Outside diameter in inches;
d = Inside diameter in inches.
49 C.F.R. §178.47