Return plumbing advice

Artplata

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#1
Wanted to get thoughts and suggestions for hard plumbing return lines. Trying to keep is simple yet as functional as possible. Unions are also going to used but not included in diagram. Manifold to run reactors as well as balance sump water level if needed.
 

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#5
You don’t really need a gate valve on the return lines if you’re running a DC controllable pump. I would add the gate valve on the drain line.
Agreed, since you are running valves on the manifold outlets to adjust flow there isn’t really a need. I would possibly still run one on the return without the manifold since it would have less resistance if you want to tune it down to match the opposing return, but you’d be fine without it.. I‘m ocd and like mine to match
 
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#6
You don’t really need a gate valve on the return lines if you’re running a DC controllable pump. I would add the gate valve on the drain line.
From OP diagram looks like return (1) run is longer then return (2). Even with a DC pump you can't regulate flow on each output. With a valve on the shorter run you can control /regulate the output.

Something to ponder on the return line since the manifold is plumbed inline. Having a GV after the manifold would help with pressure to valves. Utilizing 1 pump for both your dual output along with your 4 valve manifold that pump have to be a beast to provide enough pressure when all valves are open. As you open up the valves you will loose pressure on your return. Having a smaller pump dedicated to your manifold is something to consider or have a tandum RP for added gph and pressure and a little (just a little ) peace of mind that if 1 RP fail you'll still have some turn over rate.

Sent from my SM-N975U using Tapatalk
 

Artplata

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#7
From OP diagram looks like return (1) run is longer then return (2). Even with a DC pump you can't regulate flow on each output. With a valve on the shorter run you can control /regulate the output.

Something to ponder on the return line since the manifold is plumbed inline. Having a GV after the manifold would help with pressure to valves. Utilizing 1 pump for both your dual output along with your 4 valve manifold that pump have to be a beast to provide enough pressure when all valves are open. As you open up the valves you will loose pressure on your return. Having a smaller pump dedicated to your manifold is something to consider or have a tandum RP for added gph and pressure and a little (just a little ) peace of mind that if 1 RP fail you'll still have some turn over rate.

Sent from my SM-N975U using Tapatalk
Thank you for the advice. The main display is 160 gallons and sump being 70 gallons. Going to probably go with a Varios 6 capable of @ 1720 GPH but will probably run at 50-60%. The manifold will run at the moment a carbon reactor as well as a GFO reactor that require @ 30 GPH each. The gate valves are used to limit flow if needed to control flow to through manifold to return using 3/4 PVC. I do have extra, older RT pump that is offline to be used as a BU in the event of a failure. BU would be able to handle 3-4 turnover but with manifolds shut and possibly 2-3 with manifolds closed slightly. That should give me enough time to replace main RP when that happens. Hope that gives you more insight in my thought process.
 
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#8
Seem like having 2 gate valves on the return line to make adjustment to the manifold can be a pain. Trying to adjust the 2 outputs to be the same would be very difficult. The concern that I have with adjusting the gate valves on the return line is the back pressure.

As for the turn over rate, just keep in mind what equipments will be running off the manifold and select a appropriate return pump for the application. Getting a lot of flow from the return pump is not that important, you can achieve it with powerhead.

maybe this???
 

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