Closed loop issues

[Schplitter]

Just like everyone else I'm trying to create a problem...

I think that I need a larger pump on my closed loop system. I have looked for the last 3 months and the only logical thing to do would be to use one of the sequence pumps. Dart or Snapper... Iwaki and all the other brand names they are sold under are fine but draw way too much power and are way too loud...

Here is the issue with the Sequence pumps:

The inlet on them is 2"FNPT. The hole I have and am using now with the mag 12 is 1". If I were to use the same hole I assume that the Dart could still push about 1800 gph. Defeats the purpose of the Dart.

My other option is to drain the tank and make the hole larger. Is it worth the risk?

Powerheads are not an option since I hate the sight of them in a tank.

What would you do?

Thank you for any input and ideas,

BK

 

[capncapo]

I don't know if you can get 1800gph through a 1" hole. I know a 1" drain only does 600gph.

I think you'll need a bigger hole.

 

[Schplitter]

Yep. Just read that on the sequence page. The math is a bit off if you ask me but I'm not an expert on fluid dynamics...

 

[DrBDC]

600 gph is passive drain limit for 1" but it can flow a LOT more being pumped.

 

[capncapo]

I'm sure it can flow a LOT more than a passive drain.

Since pumps are designed to pump and not to suck I have no idea how much they can pull into themselves vs pushing out. I know that cavitation is an issue with pumps that have an elbow in the plumbing before the pump because the elbows restrict flow into the pump. I would think that a small inlet would cause a similar problem.

 

[panaboy95]

i am working on a closed loop for a dart on my 150 and i have two 2" holes they said one is pretty good two is better they said it would be better to have two so that it will not suck up a fish or other critters

 

[DrBDC]

How about split the inlet, use the existing 1" and send a second inlet over the top of the back and use a 2" pipe. Almost like the following link:

http://www.melevsreef.com/closedloop.html

 

[MayoBoy]

What's the problem with the closed loop? Not enough flow? How about using a Wavy Sea instead with the same pump? http://wavysea.com/

I might know of someone who would part with one for 175.00 (including a Tunze holder if I, er I mean he can find all the parts)

 

[Schplitter]

It sucks a lot of water if you need 2 2" holes.

I like the idea of going across the top of the tank instead of drilling it. The only problem I see is that I would not be able to run 1" pipe but would have to use 3/4 or maybe even 1/2". The reason i like it is because I would be sucking in water from a few different paces in the tank.

There is plenty of flow with the mag 12 and the 2 enductors but I have to mess with it because .... well.... I have to lol

One of the main reasons is the noise from the mag pump. The one that;s submerged is quiet while the other one is too loud for my taste...