Pump Questions
Pump Questions
(OP)
We are designing a heat transfer fluid piping system with 2 pumps running in parallel and another as a standby. If one of the pumps happens to fail or shut down and we still have fluid pressure going into that pump line, is the pump capable of withstanding the pressure of the fluid when the pump is not running?





RE: Pump Questions
Go back and re-read your post. You haven't said what pump technology you are using. You haven't said who's pump you're using. You haven't said what the MAWP on the pump casing is.
My answer to your amazingly vague question is "maybe".
David
RE: Pump Questions
Johnny Pellin
RE: Pump Questions
-Chad
RE: Pump Questions
Outlet flange rating.
I had a pump at a booster station in a mountain valley. The head going into the booster pump when it was running was drawing the total inlet pressure provided by the mountain head all the way down to 50 psi. That was well under the inlet suction flange 300# rating. When the pump stopped, the suction pressure could build up to the full head of diesel (SG = 0.825) all the wat to the height of the mountain at 1500 m (4920 ft) which equalled 1750 psig. Of course that was well over the inlet flange's pressure rating and we had to install a relief valve running to a tank to blow down that pressure to keep it below the flange limit. If you have a situation similar to that you might have a problem.
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"Pumping accounts for 20% of the world's energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies) http://virtualpipeline.spaces.live.com/
RE: Pump Questions
David
RE: Pump Questions
Now on the next project you can be sure we made engineering co specified both sides of the pump correctly. That one had a run of 150 km run at more or less sea level to the first booster, pumping up to 1500 m to the next booster, which pumped up another 1320 m climb to the summit (well an 18 km tunnel just under the summit) then downslope to 2100 m elevation distribution plant. That one was interesting, since it had a pig bypass at booster sta #2. Do you see it?
With the pig bypass opened at #2, bang .. full head from 0 to 2820 m elevation = 3300 psig on the discharge at booster sta #1 (2160 psig rating). We added a couple of valves and interlocks in that bypass, so that the #1 to #2 segment would not be loaded by the pipeline above #2 going to that 2820 m summit, and then just to be sure, in case the interlock failed, we installed a psv at booster sta #2 coming off the incoming segment from #1 and going to a relief tank; set that at 350 psig something, so anything above #2 would blow down to 350 and then the discharge at BS#1 wouldn't ever go over 2160. .... Uh huh.
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"Pumping accounts for 20% of the world's energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies) http://virtualpipeline.spaces.live.com/
RE: Pump Questions
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"Pumping accounts for 20% of the world's energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies) http://virtualpipeline.spaces.live.com/