Due to space limitations in my stand I really need to mount my external return pump in an unusual way to maximize space. It will involve a single 90 on the INTAKE side of the pump. I know 90's reduce effective flow on the output side of the pump but do they have an equal reduction on the intake(suction) side? Can I overcome that by increasing the pipe diameter on the intake side?
External Pump Plumbing
- Thread starter jonboyb
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Yes and yes
if it slows water down coming into the pump or the water column moving through piping after the pump, it'll reduce flow..
I think you'd be fine either way though..
remember, if you use flexible pipe like spa pipe (able to be glued into standard pvc fittings) then you'll reduce your head pressure - flexible piping can turn multiple 90 degree turns and not increase head pressure as the comperable pipe routing in hard walled PVC using 90's and Tees..
I think you'd be fine either way though..
remember, if you use flexible pipe like spa pipe (able to be glued into standard pvc fittings) then you'll reduce your head pressure - flexible piping can turn multiple 90 degree turns and not increase head pressure as the comperable pipe routing in hard walled PVC using 90's and Tees..
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what size intake does your pump have?
The ony time a intake should be restricted is when the outake is => restricted If not cavitation can occur. My return external is plumbed parrell to the sump as well .It has an one inch intake and I went with an one and half inch pipe
The ony time a intake should be restricted is when the outake is => restricted If not cavitation can occur. My return external is plumbed parrell to the sump as well .It has an one inch intake and I went with an one and half inch pipe
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1" intake pipe and you are fine. Like Rbredding said you might not need a bigger but why not?
That is a great question. I just went thru this myself when I replumbed my pump setup. I had to place the pumps at a 90 degree angle on the intake side as well. The larger Pan World is 1740 GPH pressure rated (return pump to two tanks), and the smaller one is 790 GPH pressure rated (dedicated chiller pump). Large pump has 1" male intake/outlet and the small pump has 3/4" male inlet/outlet. Both are hooked up to 1" bulkheads in the return section.
I originally setup the larger one with a 1" gray PVC female NPT x 1" barb 90 degree fitting, but at full throttle got this sound started like something was rattling around in the pump head. I determined it was cavitation in the 90 degree intake bend, so I replumbed it as you see. I upsized to a
1 1/4" slip x slip 90 elbow, then downsized with reducer bushings to 1" threaded on both sides. This eliminate the cavitation at full throttle. I did the same on the smaller pump, but upsized to 1" then reduced as needed to 3/4".
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I originally setup the larger one with a 1" gray PVC female NPT x 1" barb 90 degree fitting, but at full throttle got this sound started like something was rattling around in the pump head. I determined it was cavitation in the 90 degree intake bend, so I replumbed it as you see. I upsized to a
1 1/4" slip x slip 90 elbow, then downsized with reducer bushings to 1" threaded on both sides. This eliminate the cavitation at full throttle. I did the same on the smaller pump, but upsized to 1" then reduced as needed to 3/4".
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I did as well I just upsized the elbow not the pipe
I've seen it at HD or Lowes...
they are called SWEEP 90's... and yes.. they reduce the strain of a "hard 90"
If you've got a bulkhead that's sized appropriately... just run the larger intake all the way back to the sump.... that way if you've ever got to replace the pump and you're next one has a different inlet size.. you're ready to go (or if you determine that you want to upsize the pump so it will run other pump fed apparatus)
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Acroholic;388903 said:check this 90 degree elbow out:
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http://www.usplastic.com/catalog/product.asp?catalog%5Fname=USPlastic&category%5Fname=2660&product%5Fid=6283">http://www.usplastic.com/catalog/product.asp?catalog%5Fname=USPlastic&category%5Fname=2660&product%5Fid=6283</a>[/quote
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I bet that is cheap
By the way Dave nice plumbing job in you pics:up:
