Closed Loop using an OM Squirt and an Iwaki WMD40RLT

[Razor]

I'm setting up a closed loop in my tank, very similar to the attached picture which belongs to member pwj1286, except instead of drilling my tank I'm going over the back.

I'll be using an OM Squirt and my Iwaki WMD40RLT. My plan is to have a union ball valve coming out of each outlet on the OM. Then from there going with flex pvc to the back of the tank where it will connect to rigid pvc and go over the tank edge into the tank. Two of the returns will be comprised of 4 nozzles each under the sand, as seen below, with one return covering the left and the other the right side of the tank. The other two will cover the top of the tank and will each have three OM revolutions attached to them, again one return left and one right.

I'm assuming with the Iwaki pump I will have enough flow to operate all these returns given that the OM only does 1.5 returns per cycle.

The main question, other than your comments about the design, is that the Iwaki is built with 3/4" returns but should I be using a larger diameter pipe for any reason?

 

[trido]

The main question, other than your comments about the design, is that the Iwaki is built with 3/4" returns but should I be using a larger diameter pipe for any reason?

You should always (if possible) size up your piping to help reduce pipe friction thus increasing flow.

Other than that, I would say it is a sound plan. You might try to send a PM to pwj and see if he is satisfied with all of the aspects of that particular CL.

 

[Razor]

If the output is 3/4", do you go one step up to 1" or higher?

 

[trido]

1" on the intake and output should be fine. I would then use 3/4" from the squirt to the tank.

 

[Razor]

I was going to plumb the OM immediately after the pump, should I have some distance between the OM and pump instead? Otherwise, the amount of 1" pipe in the return is minimal. Regardless, I was going to use 1" pipe for the intake.

 

[pwj1286]

i agree with trido.
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Shinto Forum

 

[Razor]

pwj1286- How close is your OM to your pump? Are you running 1" from the pump to the OM and then 3/4" the rest of the way to the tank?

In your original post you ran everything using rigid pvc, any issues with noise etc.? Is there an advantage to using flex pvc?

Are you happy with the design of your closed loop? If you could change it to make it better, how would you change it?

Thanks.

 

[Anonymous]

Since all the holes on the squirt are 3/4" you're going to get constriction regardless. However I run 1" flexible PVC from my pump to the squirt, then solid 3/4" from the squirt to the tank, minimizing 90 degree elbows, using 45s if possible.

 

[pwj1286]

How close is your OM to your pump? Are you running 1" from the pump to the OM and then 3/4" the rest of the way to the tank?

I am running 1 inch from the pump to a reducer right into the OM. My pump's outputs are 1 inch. I would have to say it is 20 inches from the pump, the pipes travel to the tank about 3 to 4 feet.

In your original post you ran everything using rigid pvc, any issues with noise etc.? Is there an advantage to using flex pvc?

if you are using a large pump, its not going to be dead silent. there will be some noise. Using flex PVC will help.

Are you happy with the design of your closed loop? If you could change it to make it better, how would you change it?

You want to minimize the distance from your outputs in the tank and the out puts from your OM. Paul at OM (ceo type I guess) suggested that it works better like that.

For this reason, you should put it level on the backside of your tank. I plumbed mine under my tank, and it sometimes it “knocks” due to back pressure when the drum closes. To minimize this, it’s best to plumb it high.

I would have done that and used more flex PVC. It really helps out to reduce the amount of elbows and possible places where air can be sucked into the plumbing. downside is flex is more expensive and harder to come by. Just make sure you use plenty of ball valves on every output on the OM and intake of the OM....ALSO COUPLERS!!!! very important when you need service it.
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Mercedes Benz 350

 

[Len]

I am using a Panworld 100 which is similar to the Iwaki 40RLXT. It's going through a super squirt. I would recommend you get the super squirt over the standard squirt and use 1" piping to cut down on head loss.

 

[Razor]

Thanks for the input. I thought about mounting the Squirt above the tank so the distance from the Squirt to the returns is minimized, but I don't think I have room under my hood for it. I'm using a Solaris LED fixture and it takes up a lot of space.

Len - I'll check out the Super Squirt, thanks.

 

[pwj1286]

http://www.oceansmotions.com/store/prod ... 96a2c21cdb

that is what you want. do not get the compact. Those are very tricky to thread.

http://www.oceansmotions.com/forum/viewtopic.php?t=499

do something similar to this guy.
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South Park Forum

 

[Razor]

I would love to be able to setup the OM like that, but I don't have that much room behind the tank. The tank sits just inside the front door to my house, and the wife may be a little upset with it sitting a foot away from the wall with PVC every where.

I'm going to measure how much space I have behind my lights and see if I can squeeze it in.