|
The maximum working pressure allowed on cast steel
pipes shall be determined by the following formula:-
| W. P. = |
2 S ( t - .015D - C ) |
Eqn.(92) |
| D |
where,
t = minimum thickness
W. P = Working Pressure
D = External diameter of pipe
S = Allowable working stress as specified in regulation 343.
C = 0.64 cm(0.25 in).
Maximum Permissible Working Stress for Carbon and Alloy
Cast Steel Pipes
(See Regulation 351)
Lower value obtained in each case at the
specified temperature calculated on the following basis:-
For service
temperature at or
below 454°C (850°F) |
T.S. |
or
|
Et |
| 2.7 |
1.5 |
For service
temperature
above 454°C (850°F) |
Et |
or |
Sr |
or |
Sc |
| 1.5 |
1.5 |
|
