Hi Guys

I'm modeling the horizental pump with 1500# side 8"suction and side 6" discharge.
When I putting the anchor in pump center I'm getting very high load in suction side.
I tried to model by putting the +y restaint and pump weight in the pump centre node(instead of assuming anchor)and got the reasonable loads.
I just want to know this modeling is correct or I have to put anchor in pump centre

Thank you in advance

Mahmoud

A nozzle provides a point of "fixity". As to how rigid that "fixity" is, is somewhat complex depending on the type of nozzle.

In the case of a pump that cannot slide, the pump serves as an anchor. You could put the anchor at the nozzle if the thermal growth of the pump is insignificant. If the growth of the pump is significant, then you should use a dummy rigid from the nozzle to the (pump's) anchor point.

If the pump can slide, then you should model the pump as a series of rigid elements, and define the proper boundary conditions to allow the sliding.

The +Y restraint is not a good idea, this leaves the other degrees of freedom "free" (which isn't true), and artificially lowers the terminal loads at this nozzle.

Thank you so much for your fast response

I concur with Richard. Dealing with a 1500 Class system, I'd expected a fixed pump.

Hi Richard
Can you please give some guidelines/documents where & when sliding pump can be used. In our previous projects we try to use so many bellows for pump suction & discharge lines because of space constraint.
Finally client take over all that calculation & prepare calculation with sliding pumps.
I understand there must be some cost implication, Process limitation to use sliding pumps.

Regards
Habib

"Guidelines" are based on either Project or Company specifics. I can't comment further.