S = Mc/I
S = A1P/A2
Where:
S = tensile stress-p.s.i.;
M = bending moment-inch pounds (wl2)/8;
w = weight per inch of cylinder filled with water;
l = length of cylinder-inches;
c = radius (D)/(2) of cylinder-inches;
I = moment of inertia-0.04909 (D4-d4) inches fourth;
D = outside diameter-inches;
d = inside diameter-inches;
A1 = internal area in cross section of cylinder-square inches;
A2 = area of metal in cross section of cylinder-square inches;
P = hydrostatic test pressure-psig.
Table 1-Authorized Materials
Designation | 4130X (percent) (see Note 1) | NE-8630 (percent) (see Note 1) | 9115 (percent) (see Note 1) | 9125 (percent) (see Note 1) | Carbon-boron (percent) | Inter- mediate manganese (percent) |
Carbon | 0.25/0.35 | 0.28/0.33 | 0.10/0.20 | 0.20/0.30 | 0.27-0.37 | 0.40 max. |
Manganese | 0.40/0.90 | 0.70/0.90 | 0.50/0.75 | 0.50/0.75 | 0.80-1.40 | 1.35/1.65. |
Phosphorus | 0.04 max | 0.04 max | 0.04 max | 0.04 max | 0.035 max | 0.04 max. |
Sulfur | 0.05 max | 0.04 max | 0.04 max | 0.04 max | 0.045 max | 0.05 max. |
Silicon | 0.15/0.35 | 0.20/0.35 | 0.60/0.90 | 0.60/0.90 | 0.3 max. | 0.10/0.30. |
Chromium | 0.80/1.10 | 0.40/0.60 | 0.50/0.65 | 0.50/0.65. | ||
Molybdenum | 0.15/0.25 | 0.15/0.25 | ||||
Zirconium | 0.05/0.15 | 0.05/0.15 | ||||
Nickel | 0.40/0.70 | |||||
Boron | 0.0005/0.003. |
NOTE 1: This designation may not be restrictive and the commercial steel is limited in analysis as shown in this table.
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 | 0.02 | 0.03 |
Over 0.15 to 0.40 incl | .03 | .04 | |
Manganese | To 0.60 incl | .03 | .03 |
Over 0.60 to 1.15 incl | 0.04 | 0.04 | |
Over 1.15 to 2.50 incl | 0.05 | 0.05 | |
Phosphorus1 | All ranges | .01 | |
Sulphur | All ranges | .01 | |
Silicon | To 0.30 incl | .02 | .03 |
Over 0.30 to 1.00 incl | .05 | .05 | |
Nickel | To 1.00 incl | .03 | .03 |
Chromium | To 0.90 incl | .03 | .03 |
0.90 to 2.90 incl | .05 | .05 | |
Molybdenum | To 0.20 incl | .01 | .01 |
Over 0.20 to 0.40 | .02 | .02 | |
Zirconium | All ranges | .01 | .05 |
1 Rephosphorized steels not subject to check analysis for phosphorus.
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.
49 C.F.R. §178.37