Pump Question

[NeuroDoc]

As I am looking for a pump for my new tank (return pump), here is a question that I couldn't find the answer to. If I buy a pump that has 1" inlet and outlet, but then step it down to 3/4" right before it returns to the tank (on a seaswirl) how does that affect flow? I realize it creates more head pressure, but how much? Will it cause excessive wear on the pump, such that I should only consider 3/4" inlet and outlet?

Thanks

 

[Krish]

When you step down on the input side of the pump it puts strain on the pump, the output is fine. A lot of people even put ball valves on the output or return of the pump, to slow down/restrict flow a bit without any problems. It is just on the input side you need to keep the plumbing to the size of the pumps input or if you have a few 90's in there, step it up to a bigger size.

 

[Scooterman]

IMO if this isn't a CL then you need to consider head loss, if you have enough of it then you may get away with a smaller opening without holding back pressure in the pump.. withholding pressure in or out is never desired but done as krish said. Pumps are designed to work within a load tolerance, that is why you see some manufactures using a larger inlet to get more gph out but will allow one size smaller, normally the same as the outlet. Now with all the bs said, I'd consider the amount of head like elbows, height & other restrictions also you may divert some of that water back into the sump, feed a skimmer, reactor etc. & not produce any increased back-pressure. Also the pump will run cooler & quieter.

 

[Kensn]

Would you be ale to tee it and send some to a sea swirl and some to a static port? This way you will benifit from the full flow and still deliver enough to the seaswirl...

 

[NeuroDoc]

I was thinking of doing exactly that. Will placing loc line on the static port be a problem?

Would you be ale to tee it and send some to a sea swirl and some to a static port? This way you will benifit from the full flow and still deliver enough to the seaswirl...

 

[Scooterman]

That is a good option, you can use loc-line inside the tank, it isn't 100% water tight.

 

[Kensn]

Will placing loc line on the static port be a problem?

No, you just have to get the locline threaded pipe fittings for standard pvc pipe, then the rest will snap on fron there. Run the pvc to at least over the tank because as stated it is not 100% water tight.

You may also want to put a valve just before the static output so not too much flow goes through this and not the seaswirl. Locline has a snap on valve, this is the way my setup is currently...

 

[morgan]

can u set up a close loop by just getting a pump have an intake in the tank and then it cumming back in to the tank via pumt that out side the tank and with out a sump?

 

[Kensn]

can u set up a close loop by just getting a pump have an intake in the tank and then it cumming back in to the tank via pumt that out side the tank and with out a sump?

That is exactly the meaning of closed loop.... An intake below surface level plumbed to a pump, then returned to the tank, perferably below surface level....