Are 90 elbows that bad??? - Tropical Fish Keeping - Aquarium fish care and resources
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post #1 of 3 Old 01-19-2008, 12:25 PM Thread Starter
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Are 90 elbows that bad???

I am plumbing my sump and I can't seem to eliminate a 90 elbow on the return. I have heard that they drastically reduce flow and cause the pump to create lots of heat. However, I have looked up the head loss for elbows and its not all that bad. About equivalent to lifting the water up another half a foot or so.

The pump isn't hooked up but it will just be a straight shot up from the floor.
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post #2 of 3 Old 01-19-2008, 03:39 PM
Head pressure loss is mostly a concern on the return side. It is not that much of a problem on the supply side as it will also have the effects of gravity. 90 degree turns on the pump side will create added back pressure which will, essentially, diminish the total water flow. This, addded to the gravity effect and lift, may be of conccern when using 90 degree el's. It looks to me that you have gone to 45 degree turns instead on the pump side, which is a good thing.
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post #3 of 3 Old 01-19-2008, 07:19 PM
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Why not try 2 45's to accomplish the angle you need, It looks like it may also bring you closer to your flex hose.

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