[kannapiran.mech]

Hi,

I am doing fire water discharge piping analysis for 12″ line.
Design & Ope temp is 80 & 50degC respectively.
Seismic factor is G=0.15

In four pumps (3 working+1 standby)Following scenario considered in this analysis:
Pump-A,B,C, D @ 50degC.
Pump-A,B,C @ 50degC. & D @ 21degC
Pump-A,B,D @ 50degC. & C @ 21degC
Pump-A,C,D @ 50degC. & B @ 21degC
Pump-B,C,D @ 50degC. & A @ 21degC

Considering the above, piping load on pumps are within the allowable limit.

Now client commented to consider the occasional effects also. (W+T+P+WIN, W+T+P+U). considering this, piping load on pumps exceeding the allowable. Almost 3 times load exceeding.
(Refer the attached pdf file).

Is it necessary to check the pump nozzle in the occasional cases also??
Design temp (80degC) wants to be considered in this pump nozzle checking??

Kindly give your suggestion.

Thanks,
Kannapiran.K

[Bellows Manufacturing]

You should design to ensure the loading complies with the nozzle loads for all design conditions. Unless you can obtain a waver for the loads from the pump supplier. Solving for thermal conditions is the first step, then solving for occasional loads will come next. Look at you pipe supports, guide systems and step by step resolve the high loads and/or moments acting on your pump nozzle.

Let me know if you have more questions.

Conor

http://www.bellowsmfg.com

[Author]

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