Hi All,

I have question regarding calc. of flange strength calculation using BPV Sec VIII Div.1 App.2

When we inform equipment vendor about piping max load at the equipment nozzle Faxial (Fa) and Ftransverse (Fc & Fl) and also Moment torsional (Mt), circumferential, longitudinal (Ml),Vendor come up with their calculation as per BPV code and they said that as per standard design, transverse force and trosional moment won't be taken into consideration.

As per my understanding, trasnverse load will trigger moment (Ml and Mc) and radial force will trigger torsioanl moment. Hence, as long as radial force and Longitudinal/ Circumferencial moment. Whether the reason of not to consider transverse force and torsional moment having relationship with above condition?


Thx in advance.

Shear forces and torsional moment are considered of minor importance in a flange design, mainly because they will not normally lead to distortion and thus leakage. Clearly these loads should not be uncontrolled however.

The situation with a nozzle on mechanical equipment is different. Here all forces and moments may be of concern.