sir,

Three pumps are paralelly arraneged with commom header piping ,for both suction and discharge.

i created two files 1. pump suction and pump discharge . the pump nozzle considered as anchor.

is it THE CORRECT approx for analysis or i need to model suction and disscharge in one (1) model. please advice me

regards

pipehawk

Model the pump as a series of rigid elements, with the anchor at the base. Then you can include/analyze both the suction and discharge piping.

Pumps are typically considered to be rigid components when included in a system analysis so that calculated strain-based (thermal) loads will be (conservatively) higher. These rigid components may still grow thermally but they should not distort under load. Since they are not intended to distort under load, suction side response is isolated from discharge side response. If so isolated, there is not reason structural reason to model through the pump. It's up to you. It may be more convenient to do so.