q: Pump Supply

John wrote:
I'm not sure what youre asking, if you can restate the question that'd help me
)

I _think_ you might be asking about head loss. There are a couple calculators
on the left hand side navigation bar on reefcentral.com.
~John

Head is calculated on the pressure end of the pump. Question was by
placing @3' od pipe and 2 elboes on the supply end of the pump 2x input
size will this affect pump performance.

actually I think he is worried about "starving" the pump. And if thats the
case, the plan sounds fine.

"Chris" wrote in message
.. .

|
| Head is calculated on the pressure end of the pump. Question was by
| placing @3' od pipe and 2 elboes on the supply end of the pump 2x
input
| size will this affect pump performance.

I think I may be catching up. Let me get this straight. You have a
return pump. Is it in the sump, or external? Placing too small a
supply line on almost any pump can cause cavitation, which will tear
up a pump. Elbows add friction, increasing the chances of this.

I think we're just confused by the 'supply pump' term.


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depends on the way you look at things i guess Supply to the tank
return from the tank


Anyhow the pump has a 3/4" input if i have a 3' pipe and 2 elbows of 1
1/2" will this obstruct the pump?




Billy wrote:
"Chris" wrote in message
.. .

|
| Head is calculated on the pressure end of the pump. Question was by
| placing @3' od pipe and 2 elboes on the supply end of the pump 2x
input
| size will this affect pump performance.

I think I may be catching up. Let me get this straight. You have a
return pump. Is it in the sump, or external? Placing too small a
supply line on almost any pump can cause cavitation, which will tear
up a pump. Elbows add friction, increasing the chances of this.

I think we're just confused by the 'supply pump' term.


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"Chris" wrote in message
...
| depends on the way you look at things i guess Supply to the tank
| return from the tank
|
Ah, ok. Generally referred to, for clarity, drain or overflow(to
sump) and return (from sump to display tank). This isn't something
arbitrary, it's pretty much the standard terms.



| Anyhow the pump has a 3/4" input if i have a 3' pipe and 2 elbows
of 1
| 1/2" will this obstruct the pump?

2 elbows shouldn't create enough resistance to cause a problem. Is
this 'input to pump' all on one plane? It's not having to pump the
water up and back down or vice-versa *before* the pump input, is it?
If this is an external pump, not immersed, you should do all you can
to keep the 'inlet' as short and straight as possible to minimize the
danger of running the pump dry.




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Except in plumbing where as supply is pressurized and return is
gravity...

Billy wrote:

"Chris" wrote in message
...
| depends on the way you look at things i guess Supply to the tank
| return from the tank
|
Ah, ok. Generally referred to, for clarity, drain or overflow(to
sump) and return (from sump to display tank). This isn't something
arbitrary, it's pretty much the standard terms.



| Anyhow the pump has a 3/4" input if i have a 3' pipe and 2 elbows
of 1
| 1/2" will this obstruct the pump?

2 elbows shouldn't create enough resistance to cause a problem. Is
this 'input to pump' all on one plane? It's not having to pump the
water up and back down or vice-versa *before* the pump input, is it?
If this is an external pump, not immersed, you should do all you can
to keep the 'inlet' as short and straight as possible to minimize the
danger of running the pump dry.




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What brand is your return pump? If it is a Mag pump, you
need to double the diameter of the outlet for your plumbing
needs. So in this case of a 3/4" outlet you'd need 1.5"
plumbing.

Marc


Chris wrote:
Except in plumbing where as supply is pressurized and return is
gravity...


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basically i was going to drill a hole in the side of my pump and run 2
elbows 1 inside the sump bottom sucking and the other to run a straight
3' pipe past the edge of my sump to the pump where the pump will only
have to pump straight up to the tank.. instead of putting the pump right
in front of my sump under the stand this would be a lot cleaner


Billy wrote:

"Chris" wrote in message
...
| depends on the way you look at things i guess Supply to the tank
| return from the tank
|
Ah, ok. Generally referred to, for clarity, drain or overflow(to
sump) and return (from sump to display tank). This isn't something
arbitrary, it's pretty much the standard terms.



| Anyhow the pump has a 3/4" input if i have a 3' pipe and 2 elbows
of 1
| 1/2" will this obstruct the pump?

2 elbows shouldn't create enough resistance to cause a problem. Is
this 'input to pump' all on one plane? It's not having to pump the
water up and back down or vice-versa *before* the pump input, is it?
If this is an external pump, not immersed, you should do all you can
to keep the 'inlet' as short and straight as possible to minimize the
danger of running the pump dry.




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"Chris" wrote in message
...
basically i was going to drill a hole in the side of my pump and run 2
elbows 1 inside the sump bottom sucking and the other to run a straight
3' pipe past the edge of my sump to the pump where the pump will only
have to pump straight up to the tank.. instead of putting the pump right
in front of my sump under the stand this would be a lot cleaner


Your plan will work fine. You should have no problem extending your pump
intake pipe. Although I would use a 1" bulkhead, pipe, and elbows to make
your extension, just so that there is less chance of "starving" your pump.
Whatever you do, you must use AT LEAST the same size pipe as the pumps input
fitting.

That said, I'm a firm believer in oversizing both input and output piping
anytime there is a pump involved.

Kev