S = [P(1.3D2 + 0.4d2)] / (D2 - d2)
Where:
S = wall stress in pounds psi;
P = 750 psig (minimum test pressure);
D = outside diameter in inches;
d = inside diameter in inches.
Percent porosity of filler | Maximum acetone solvent percent shell capacity by volume |
90 to 92 | 43.4 |
87 to 90 | 42.0 |
83 to 87 | 40.0 |
80 to 83 | 38.6 |
75 to 80 | 36.2 |
70 to 75 | 33.8 |
65 to 70 | 31.4 |
Percent porosity of filler | Maximum acetone solvent percent shell capacity by volume |
90 to 92 | 41.8 |
83 to 90 | 38.5 |
80 to 83 | 37.1 |
75 to 80 | 34.8 |
70 to 75 | 32.5 |
65 to 70 | 30.2 |
49 C.F.R. §178.60