Cryogenic liquid | Design service temperature |
Argon | Minus 320 °F or colder. |
Helium | Minus 452 °F or colder. |
Hydrogen | Minus 42 3 °F or colder. |
Neon | Minus 411 °F or colder. |
Nitrogen | Minus 320 °F or colder. |
Oxygen | Minus 320 °F or colder. |
S = [P(1.3D2 + 0.4d2)] / (D2 - d2)
where:
S = wall stress in pounds psi;
P = minimum test pressure prescribed for pressure test in psig;
D = outside diameter in inches;
d = inside diameter in inches.
Size of specimen | Minimum impact value required for avg. of each set of three specimens (ft.-lb.) | Minimum impact value permitted on one only of a set of three (ft.-lb.) |
10 mm * 10 mm | 15 | 10 |
10 mm * 7.5 mm | 12.5 | 8.5 |
10 mm * 5 mm | 10 | 7.0 |
10 mm * 2.5 mm | 5 | 3.5 |
Table 1-Authorized Materials
Designation | Chemical analysis, limits in percent |
Carbon1 | 0.08 max. |
Manganese | 2.00 max. |
Phosphorus | 0.045 max. |
Sulphur | 0.030 max. |
Silicon | 1.00 max. |
Nickel | 8.00-10.50. |
Chromium | 18.00-20.00. |
Molybdenum | None. |
Titanium | None. |
Columbium | None. |
1 The carbon analysis must be reported to the nearest hundredth of one percent.
Table 2-Physical Properties
Physical properties (annealed) | |
Tensile strength, p.s.i. (minimum) | 75,000 |
Yield strength, p.s.i. (minimum) | 30,000 |
Elongation in 2 inches (minimum) percent | 30.0 |
Elongation other permissible gauge lengths (minimum) percent | 15.0 |
Table 3-Check Analysis Tolerances
Elements | Limit or specified range (percent) | Tolerance over the maximum limit or under the minimum limit |
Carbon | To 0.030, incl | 0.005 |
Over 0.30 to 0.20, incl | 0.01 | |
Manganese | To 1.00 incl | .03 |
Over 1.00 to 3.00, incl | 0.04 | |
Phosphorus1 | To 0.040, incl | 0.005 |
Over 0.040 to 0.020 incl | 0.010 | |
Sulphur | To .40 incl | 0.005 |
Silicon | To 1.00, incl | 0.05 |
Nickel | Over 5.00 to 10.00, incl | 0.10 |
Over 10.00 to 20.00, incl | 0.15 | |
Chromium | Over 15.00 to 20.00, incl | 0.20 |
1 Rephosphorized steels not subject to check analysis for phosphorus.
(°F); and
49 C.F.R. §178.57