Parallel Pumps Head Loss
Parallel Pumps Head Loss
(OP)
Hello,
I have two parallel pumps: pump-1 has a 32-gpm flowrate and pump-2 has a 96-gpm flowrate. These two pumps feed into a loop that has a 128-gpm flowrate and 58-ft of head loss.
How much headloss do I use from the 128-gpm loop for each of these pumps for pump sizing?
--Steve M.





RE: Parallel Pumps Head Loss
RE: Parallel Pumps Head Loss
Then look at 60 feet, if it says 32 and 96, then thats 128 gpm. This means you'll need to add 60 - 58 ft = 2 feet of added head loss to each pump.
RE: Parallel Pumps Head Loss
Yes, I want to know the head loss for each pump.
What's the logic to your answer?
--Steve
RE: Parallel Pumps Head Loss
Delivery pressure is the same for each pump and flows are additive in a parallel connection.
Ted
RE: Parallel Pumps Head Loss
RE: Parallel Pumps Head Loss
Do I simply add each pumps fitting loss to the main section loss of 58-ft? to compute pump-1 90-ft loss and pump-2 34-ft loss?
Comparing piping to circuit analogy, the piping head loss or pressure loss is equivalent to the voltage decrease across a resister.
But, whereas in circuits a resistance value is normally provided for the resister in piping systems a pressure drop (equiv. voltage drop) is normally provided for differing flow rates.
Any thougts?
--Steve M.
RE: Parallel Pumps Head Loss
If this is the case then pump 1 will have a total head across the pump of 32 + 58 = 90ft, pump 2 will have 2 + 58= 60ft
RE: Parallel Pumps Head Loss
The bypass pump is 2-ft head piping at the pump plus 58-ft in the common pipe system that equals 60-ft of head total for the bypass pump.
The 58-ft head section connects to the input/output of the two pumps in parallel.
Thanks!
--Steve M.
RE: Parallel Pumps Head Loss
RE: Parallel Pumps Head Loss
The head we are talking includes physical distance plus loss for fittings and pipe friction?