Water pump discharge line
Water pump discharge line
(OP)
Hello,
In a fire fighting project that I, and my coworkers are designing, we seem to have a bit of probleme at the discharge line of a water pump (Q= 1115 m3/h, P= 15 bars). As matter of fact, we had an elbow (LR) at the discharge nozzle, but when we rechecked on site restrains, we had to replace it with an other elbow (SR). My question is as follows:
- Is it acceptable to use a SR elbow at the discharge line of such pumps? if not could you explain why ?
- If it is not accpetable, could you please provide another solution
looking forward to recieving your responses
In a fire fighting project that I, and my coworkers are designing, we seem to have a bit of probleme at the discharge line of a water pump (Q= 1115 m3/h, P= 15 bars). As matter of fact, we had an elbow (LR) at the discharge nozzle, but when we rechecked on site restrains, we had to replace it with an other elbow (SR). My question is as follows:
- Is it acceptable to use a SR elbow at the discharge line of such pumps? if not could you explain why ?
- If it is not accpetable, could you please provide another solution
looking forward to recieving your responses





RE: Water pump discharge line
And elbow at the discharge will cause off-center loads on the impeller, shaft, bearings, and seals.
There is no orientation that would allow a straight run out of the pump? not even upward?
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P.E. Metallurgy, Plymouth Tube
RE: Water pump discharge line
That's quite a large flow. I'm surprised you've had to squeeze this important pump into a small space but we have no information to use.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Water pump discharge line
what I understood from your replies, is that the real problem lies in a piping stress calculation, not a pressure drop, please correct me if i am wrong
RE: Water pump discharge line
It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)
RE: Water pump discharge line
It also might impose issues back on the pump - they normally like at least 1 or 2 D straight pipe, but check the installation manual of the pump supplier to see what they recommend. Also talk to them about your situation to make sure it won't have serious consequences. they won't like it, but should say it's acceptable or not.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Water pump discharge line
LittleInche, thank you for your reply, I think that's what I should do, and I will be checking the installation manual, apart from the manual, is there any Standard or handbook that could help, I am trying to get the best out of this probleme, still learning you know
RE: Water pump discharge line
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Water pump discharge line
http://www.eng-tips.com/viewthread.cfm?qid=406497
RE: Water pump discharge line
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P.E. Metallurgy, Plymouth Tube
RE: Water pump discharge line
Especially for what is really an intermittent service, you will have no issue with pipe erosion either.
RE: Water pump discharge line
It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)
RE: Water pump discharge line
Thank you everyone