Pump Question Please

[PDD]

Hi all,

I need suggestions for a strong pump to handle the following:

I am running a 120 gallon tank with a sump in the basement. I have set up a "closed" loop with the return dropping approx. 6' to the proposed pump and a 1/2" actuated valve. My return line from the tank is 1 1/2" and my output to the valve from the proposed pump (and eventually the tank) is 1/2". Unfortunately my valve is only 1/2". Anyway, I tried using a Mag 7 and an Iwaki 40RLT both with little success - not enough flow. I suspect this is due to the head and the small opening in the ball valve. Therefore, I think I need to make up for the extra head and small orifice by force. I would like to get as much GPH as possible through the 1/2" line since it splits at the tank, one each side. I am willing to oversize the pump if necessary.

I would appreciate anybody with some pump knowledge to guide me through this one.

Thanks.

PDDII

[ February 18, 2002: Message edited by: PDD ]</p>

 

[Ph]

If there is no sump in the basement and it is a true closed loop then the only head you have in the system is the piping and the valve. If at all possible I would switch to 3/4" on the valve and the final return line. The only other choice is to find a proper sized pressure rated pump and even then there is kind of a limit on how much flow you can push threw 1/2" valve.

Gluck on the project.

Ph

 

[PDD]

Ph,

You hit the nail on the head. I guess I am trying to determine how much water I can force through the 1/2" ball valve and how strong of a pump is needed to do that.

Thanks.

PDDII