Dear Richard,

I have an example showing the problem:

Design Pressure = 38 barg
Axial Force = 6355 N
Bending Moment = 15235 N.m.
G/C = 9.91 in

CAESAR II calculates the equivalent pressure as follows:

Peq = 49.87 (bars)
Allowable Pressure = 132.16 (bars)
Ratio % = 37.73%

=> Please refer to node 10 to 20 in the attached S7-002_S.out.

If I calculate the Peq induced from the external forces and moments,

Peq = F / (pi * G^2 / 4) + M / (pi * G^3 / 16)
= 6355 / (pi * (9.91 * 0.0254)^2 / 4) + 15235 / (pi * (9.91 * 0.0254)^3 / 16)
= 1277.06 + 48650.85 = 49927.91 (Pa)
= 49.93 (bars)

Therefore, if I calculate the summation with the maximum pressure:

Peq + Pmax = 49.93 + 38 = 87.93 (bars)
Allowable Pressure = 132.16 (bars)
Ratio % = 87.93 / 132.16 = 66.5%

In this calculation, I think CAESAR II Peq report does not include the design pressure of the piping system.

Could you please help me to figure out the reason?