Indicates how the value of hoop stress should be calculated. The default is to use the ID of the pipe. Most piping codes consider the effects of pressure in the longitudinal component of the CODE stress. Usually, the value of the hoop stress has no bearing on the CODE stress, so changing this directive does not affect the acceptability of the piping system.
If necessary, you may change the way CAESAR II computes the hoop stress value. Available options are:
ID
Compute hoop stress according to Pd/2t, where d is the internal diameter of the pipe.
OD
Compute hoop stress according to Pd/2t, where d is the outer diameter of the pipe.
Mean
Compute hoop stress according to Pd/2t, where d is the average or mean diameter of the pipe.
Lamé
Compute maximum hoop stress according to Lamé's solution: s = P(Ro2+Ri2)/(Ro2-Ri2).
When the piping code specifies hoop stress evaluation, the software uses the code's
hoop stress calculation and ignores Base Hoop Stress On. For example, offshore or transportation piping codes, such as B31.4, B31.8, and
DNV, specify hoop stress evaluation.