Determine the required thickness t, exclusive of allowance for corrosion, of a seamless torispherical head for the following conditions: D = 40 in, crown radius = 40 in, knuckle radius = 4 in, S = 13750 psi, P = 200 psi, E = 0.85 (spot examined joints of shell and head) & E = 1.00 (seamless head)
Determine the required thickness t, exclusive of allowance for corrosion, of a seamless torispherical head for the following conditions: D = 40 in, crown radius = 40 in, knuckle radius = 4 in, S = 13750 psi, P = 200 psi, E = 0.85 (spot examined joints of shell and head) & E = 1.00 (seamless head) [Hint: to solve the above problem, refer to table 1-4.2]
TABLE 1-4.2 VALUES OF FACTOR M
Use Nearest Value of Lr
Interpolation Unnecessary
Lr 1.0 1.25 1.50 1.75 2.00 2.25 2.50 2.75 3.00 3.25 3.50
M 1.00 1.03 1.06 1.08 1.10 1.13 1.15 1.17 1.18 1.20 1.22
Ur M
4.0 1.25
4.5 1.28
5.0 1.31
5.5 1.34
6.0 1.36
6.5 1.39
7.0 1.47
7.5 1.44
8.0 1.46
8.5 1.48
9.0 1.50
L/r M
9.5 1.52
10.00 1.54
10.5 1.56
11.0 1.58
11.5 1.60
12.0 1.62
13.0 1.65
14.0 1.69
15.0 1.72
16.0 1.75
162/1 1.77
NOTE: 1 Maximum ratio allowed by UG-32(j) when equals the outside diameter of the skirt of the head
