How do we model pump(end suction & top discharge) on caesar? from what i have mostly seen they only put an anchor on the intersection of the nozzle centerlines, so that the suction will only have a horizontal displacement and the discharge a vertical displacement only. But some approach they are modelling even the support of the pump and the anchor will be placed on the support, for this case the suction will now have a vertical and horizontal displacement. Please advise on this, what is the most applicable consideration? Thanks.

Check out the Pump GA & find the kind of supporting i.e whether its centrally supported or supported at offset. For the former case , place an anchor at the zero thermal growth location (i.e intersection of nozzle axes). Model the pump as rigid element with proper dia & significant thk. to impart rigidity.

For the latter case, model with offset & place anchor at the location of fixity & then follow the above procedure.

Do remember to make the pumps operating & stand-by cases as per your Process.


Hope this helps.


Keep Smiling,

SJ

“One of the most responsible things you can do as an adult is to become more of a child.”

Dear Leo81457,

Most pump manufactures gives Allowable forces + displacements in the pump GA ofcourse for both Suction and Discharge nozzles. (If your pump manufacture doesn't send this info ask them to provide).

Modeling suction/discharge nozzle with anchors will be sufficient enough if you place the displacements on the anchors during analysis and check for restraint loads after analysis to be less than the allowable forces on suc/dis flanges.(API-610)

This way you don't have to connect the suction and discharge piping and you can analyze them separately.

Hope above mentioned option helps!
SJ's method is also correct if you don't have enough Pump GA data.

Regards,
Salz