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90 degree fitting, better to have on inlet or outlet of pump?

post #1 of 12
Thread Starter 
I need to use a 90 degree fitting on my d5 pump top, what would reduce performance the least, having it on the inlet or outlet
post #2 of 12
Performance effect is pretty much negligible to begin with. I don't know the hard numbers on inlet vs outlet, but I feel like inlet would have less of an impact.
post #3 of 12
Quote:
Originally Posted by oicwutudidthar View Post

I need to use a 90 degree fitting on my d5 pump top, what would reduce performance the least, having it on the inlet or outlet

Nope at all.
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post #4 of 12
I've heard some people say that having a 90 right into/out of their D5 caused some sort of noise... I don't so I'm not sure if it's true but I'll just put it out there.

You could also just try multiple orientations and use the one that works best.
post #5 of 12
What kind of noise?

Both my setup (D5 and MCP35X) have a 90 and 45 and I never had problems noise or flow rate.
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post #6 of 12
Quote:
Originally Posted by Ironsmack View Post

What kind of noise?

Both my setup (D5 and MCP35X) have a 90 and 45 and I never had problems noise or flow rate.

Not sure, I have only heard of it as I don't have such a setup. Could just be someone's faulty pump or something else.
post #7 of 12
it was said quite a while ago by martin that having a 90* elbow on the pumps intake hurts performance. no one seems to notice or care though.
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post #9 of 12
Quote:
Originally Posted by Big Elf View Post

Probably because he didn't say that.

Looks like it depends a lot on if your angled fitting is really narrow or not.
post #10 of 12
Quote:
Originally Posted by Big Elf View Post

Probably because he didn't say that.

He definitely did, just not on that review:
Quote:
My test does not include pump close proximity effects. I only tested restriction losses. I have done some pumpnelbow testing, but it likely depends on the pump. In industrial pump system design practice is to avoid elbows at the pump inlet side of the pump within 4x the pipe diameter. Reason for this is the elbow can cause enough negative pressure to induce cavitation as well as unbalancing the fimpeller flow. Outlet is generally less of a concern.

I have measure the benefits of removing elbows at the inlet side such as going from a factory DDC top to aftermarket top with inlet elbow removed etc.

Anyhow, I would generally avoid elbows in close proximity to the pump if possible, my test was purley based on pressure drop or restriction loss.

Source: The legendary thread listed in my siggy.

In all fairness that is for use on industrial pumps, but I would think the theory is the same.

Anyways, OP: Put it on the outlet if you must. 90 degree fittings in close proximity to the pump have been known to add a slight swooshing sound in some circumstances, so do keep that in mind.
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