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pump and system curves 5

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solidspaces

Mechanical
Dec 8, 2011
44

the performance of our chilled water pumps is attached.
• There are four pumps on duty (the pump selection and duty point performance is on page 1 of the attachment).
• We obtained readings of each pump with all the four pumps running. (Curve is on page 2 of the attachment).
• We also took the readings of each pump without operating the other pumps (Curve is on page 3 of the attachment).
• The pressure measured on the common discharge header with all 4 pumps running is 75psi.
• Are the attached pump curves drawn correctly? If yes, the pumps are not performing as they should both when run one at a time or when all 4 are run in parallel, and how does this compare with system head
 
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Thank you both Artisi and LittleInch. I think I will let common sense rule and provide a duplex submersible set. I did post this question on the OSHA Forum, but I have solid answers from the Pumps Forum. Thanks again
 
I would look at 1 low capacity unit for nuisance cleanup and 1 large unit for the disaster situation.

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.)
 

Artisi:
Your proposal makes sense. Actually the problem of flooding from any stray leaks inside the pump room is compounded because connecting the overflow of decorative fountain's balancing tank to the nearest storm or sanitary drainage manhole was missed by the Contractor. Since the earthwork is done, he wishes to core into the balancing tank wall that is common to the wall of the pump room, and route the overflow into a sump pit in the pump room, from where it will be force discharged into the backwash line. I am reluctant about this proposal, because the submersible in the pump room will only cut in in the unlikely event of leaks, but allowing the overflow to come to the pump room is like inviting trouble that can be avoided by direct drain of the balancing tank. Am I being overcautious?
 
Trouble doesn't need much of an invitation. In fact, it generally shows up when not invited.

Independent events are seldomly independent.
 
Nothing like building in your own disaster scenario.

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.)
 
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