The Red Dragon as return pump and water outlet

[7thheaven]

Hi all~~!!!

In my country...Most of people have used Iwaki pump (20rx or 30rx)
Our concept is reducing return pump and increase powerhead so to speak...
because electricity cost is very burden for us like you..

but things are changed...Rd pumps is released in my country..Rd is very
efficent,powerful pump.. and gph is almost double than Iwaki...

Today I received BK and RD 6.5. I will install them in my new 100gal tube
tank...RD will be used as return pump.. People said 6.5 is very strong and
poweful flow in my tank, so only one water outlet to main tank makes
my SPS fall down...so I feel nervous...

Could you tell me your opinion about water outlet?

Should I use the concept of calfo manifold like this?

http://i17.photobucket.com/albums/b9..._installed.jpg

[OUinLA]

The manifold will not work with RD pumps. For a manifold you need to use a pressure rated pump. If the RD is too strong try splitting it into two outputs, or try getting one of the ocean motion devices if that will work for you.

[GTR]

Madison... won't work or you'll be giving back to much of the flow from head?

SteveU

[moonpod]

You sure Madison? I dunno Vince, I think it'd be fine. I don't like manifolds personally, but other people love 'em. I can't remember...do you use imperial (inches) or metric pvc in Korea? If you use metric, just go 40mm the whole return and make 2 returns off of a "T" and you'll be fine. 1.25 or 1.5" if you use imperial. Course I'm not sure what size outlet a RD 6.5 has. It may be smaller than 40mm.

[Miguelito]

Maybe you could take the return right up the middle of the back of your tank, put a Y on it, then put 2 more Y's on each end. Each of the 4 returns can go right over the back of your tank.

The biggest problem with a manifold is that water goes where it wants to go. You will get very irregular flow out of the returns unless you put valves on them.

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RD

edit - ok this website doesn't register spaces, but you can probably figure out what I mean. It woud drastically cut back resistance.

[Heinz]

The manifold will not work with RD pumps. .

i guess you have a reason to say that, did somebody try it and it didnt work ? or what makes you say that ?

[7thheaven]

You sure Madison? I dunno Vince, I think it'd be fine. I don't like manifolds personally, but other people love 'em. I can't remember...do you use imperial (inches) or metric pvc in Korea? If you use metric, just go 40mm the whole return and make 2 returns off of a "T" and you'll be fine. 1.25 or 1.5" if you use imperial. Course I'm not sure what size outlet a RD 6.5 has. It may be smaller than 40mm.

The outlet size of 6.5 is 1inch so I plan to make all return plumbing 1inch

[moonpod]

OK, I'm not sure about the RD 6.5. You're PROBABLY ok with 1inch plumbing b/c I'm pretty sure the outlet is smaller than 40mm (25???) so going 1 inch is fine. If it's 25mm (quite likely) that's so close to 1 inch, you'll be ok (1 inch is like 25.4mm or something).

The intakes are more problematic. If you run it external, 40mm best matches 1.25" pipe, but there's a significant difference. 1.5" I.D. silicone tubing works really well to connect the 40mm inputs to 1.25" pipe.

[7thheaven]

OK, I'm not sure about the RD 6.5. You're PROBABLY ok with 1inch plumbing b/c I'm pretty sure the outlet is smaller than 40mm (25???) so going 1 inch is fine. If it's 25mm (quite likely) that's so close to 1 inch, you'll be ok (1 inch is like 25.4mm or something).

The intakes are more problematic. If you run it external, 40mm best matches 1.25" pipe, but there's a significant difference. 1.5" I.D. silicone tubing works really well to connect the 40mm inputs to 1.25" pipe.

Thanks....Moonpod...

About Intakes...actually I plan to install 1inch bulk head in sump and connect
adapter or reducer from 40mm to 1inch. so I asked you about this using PM.. and you said that you recommanded to use just sillicon
hose to connect them..How about this? Can I use 1 inch sillicon hose?

this is your comment when I asked you about this problem...

I asked this..

Originally Posted by 7thheaven
Dear Chuck..

Hi... How are you?
I am seeing your thread about new tank interestingly.

I wanna ask you about Rd pump.

I ordered RD6.5m3 and know that the inlet size is
40mm..and my main plumbing size is 1inch(25mm)

Can I connect RD pump to 25mm silicon hose or
eheim hose? or need adapter?(40->25)

Thanks in advance~~

From tomorrow evening, the holiday of Chu sok begins

Happy Chu sok...

and your answer is...

Happy Chu Sok indeed....

Depending on your plumbing situation you can either get metric/imperial adapters (Madison can get 'em) or use the silicone tubing that Klause likes to connect the pumps to the pvc. I'm surprised you use imperial pvc in Korea. I would think that it would be metric....

I dunno exactly the outlet size on the 6m3 pump, I've only used/have the 12m3 and the in/outs on that pump are 40. I would NOT constrict the pump down to 25mm. I would "T" it to two 25mm lines. These are very much flow pumps and do not like constrictions.

[losmandy]

The RD 6.5m3 has 40mm inlet and 25mm outlet.

You would need a 40mm bulkhead and a 25mm outlet piping.

[moonpod]

Vince, I misinterpreted your PM.

The outlet should NOT be restricted. 40mm best corresponds to 1.25", but that is hard (at least in the US) to find in a Bulkhead. I use 1.5" bulkheads and then a bushing that shrinks down to 1.25" and then put some silicone tubing between a piece of 1.25" pipe and the 40mm outlet. Hoseclamps of course as well. I got some tubing from captiveoceans, but found that tygon 1.5" I.D. silicone tubing is VERY similar. You can similarly adapt the outlet to 1" pipe.

[moonpod]

The bulkheads are 1.5" with a 1.5 to 1.25" bushing and a small piece of 1.25" pipe.

[7thheaven]

Some people in korea that use RD pump said this pump is incredible...and worried about
my tank that 6.5 is too big for my 80cm cube tank..the hole of overflow is more than
1.5inch otherwise the water will be overflowed... but if I install 1.5 inch plumbing, my
overflow box is a little big relatively...

Do you think RD6.5m return pump is too big for my tank SPEC?

If I use RD6.5m in my cube(80x80x55),which size of overflow hole is OK?

I wanna know your opinion...

Thanks...

[moonpod]

OK, 6500l/hr. Assume some head losses so call it 5500l/hr. That is in the ballpark of 1400 g/hr. A 1.5" bulkhead will BARELY keep up with that. Much safer is either 3 1" (roughly 1800 gph capacity) or a couple of 1.5" bulkheads (3000 gph capacity). That is in the tank.

80cm cube tank is roughly a 31" cube tank about 120 or so gallons. What I'd advise is this--make an external overflow. ie, assuming that this tank is 3 sides viewing, cut out the back top of the tank, about 2cm of height. Leave some in the corners for bracing stability. Have a 15x15cm box made to fit along the back top of the tank with 2 1.5" bulkheads placed in there as drains. That's if you're dead set on using the RD as a return pump. If you want to use the RD but you're willing to have a different return pump, use the RD as a closed loop pump and get something that pushes about 500 gph at your head pressure for the return.

[7thheaven]

Thanks...
you said 1.5 bulkhead was using 1.5bulkhead+gate valve? or 1.5 durso pipe?
1.25bulkhead durso is too small for RD 6.5? because I plan to use 1.25bulkhead durso
system..