Plumbing experts pls help with plumbing and SCWDs

[adwilk420]

1. How much flow can two one inch overflow drilled in the bottom of my tank handle.

2. I'm planning on running two SCWD's off my return pump. The pump will be about 3 and a half feet below the bulkheads for the returns. I was planning to use a T then two 90 degree elbows then up to the SCWD then elbows off the SCWD's to the four bulkheads in the back of the tank. In side the tank I plan on having the ball joint tubing with either flat nozzle or y shaped returns. It seems like the pump is going to be doing quite a bit of work. I know that the SCWD is only rated for 1400 GPH. Would the GPH be cut in half because I T off the return. Also with all that head if I wanted around 750-800 GPH how powerful of a return pump would I need. I want a submersible pump and was looking at the Mag12 and Mag18. This will be the only circulation in the tank so I want to have enough power.

Any advice is much appreciated.

Alex

 

[highrpm]

I would advise to run 2 mag 12's, that may you can run each scwd seperately, and have less head loss due to the plumbing issues. I don't think you will get enough flow with one mag 18 running two scwd's. your overflows should be able to handle that much flow, but always put ball valves in so you can throttle it back if needed.

 

[adwilk420]

What if I did a mag 24 with the 2 ball valves? What are the advantages of having the two pumps?

 

[Anonymous]

Two pumps = redundancy incase of a pump failure.
_________________
going green

 

[highrpm]

I agree with having two pumps for redundancy. I also think you will still get more flow from 2 mag 12's vs 1 mag 24. I would also advise this may be a better option due to micro bubbles. One powerful pump can create a larger problem with microbubbles, compared to two smaller pumps. I would say to go with one internal pump you would need a mag 36, which is about the same $ as 2 mag 12's, and if the 36 were to have problems, you would be stuck with out a pump. It would make it easier for cleaning too, clean one mag 12 while the other is still running the tank.

 

[adwilk420]

Thanks for the imput guys you rule.