return pump question

[DonW]

Hope I'm not starting an argument here.

Not at all. I'm not saying dont take the freebe,heck free is free use it to mix salt or what ever. Just dont use it in your sump. What I'd like to avoid here is the threads you'll be starting a few months from now like. "My tank gets to hot", "problems with nitrates" "Algae help". Not once has anyone asked what size your sump is, nor have you stated what skimmer your using. Your building a reef system, systems are parts and pieces that work together and hopefully compliment each other. Do it right the first time and you may have some sucess in this hobby. You can be like me and alot of others that have closets or atics full of bad decisions instead of tanks full of coral.

Its all good
Don

 

[dmbfreek]

10g sump and an remora skimmer.

 

[burning2nd]

same as me! yaaaaAAAAAAAAAhhh

 

[Krish]

10g sump and an remora skimmer.

You definately won't want a mag12 sitting in something that small! :shock: I agree with Don...Piece everything together accrdingly and you'll have nothing but success and save you tons of headache down the road. Good luck with the project! Make sure and post some pics when you get a chance

 

[dmbfreek]

will do. Thanks!

 

[dmbfreek]

just ordered a mag 7 and an aqua lifter from premiumaquatics.com. I had no idea they give you a discount for being a RF member.

 

[Scooterman]

Back pressure always adds cost.

On a side note, I was talking to an engineer the other day & he was explaining to me that on a centrifugal pump, if you restrict the out flow you will in effect be saving power consumption because the pump isn't moving as much water under the restriction like it you were to add a gate valve, this all came up because of the pump I got & wanting to sell it for a smaller pump, me thinking that would be cheaper on power.

 

[Meche]

A centrifugal pump is a negative displacement type pump, it is effected much differently by restriction than a positive displacement type pump (piston or gear). But a pump sees restriction as restriction. It doesn't care if its a gate valve, 100' of line, 10 elbows, or a 4' rise.

If you restrict a centrifugal pump it won't slow down (loose RPM) much. But because it is not a positive displacement pump, its efficiently will decrease because it won't flow as much water (or whatever). You won't loose extra power but you won't save any either. This type of pump will consume a constant number of watts regardless of restriction; but it may not return all of this energy into the water.

I think I'm restating what you said? Not sure, it just looked a little funny the way you said it.

 

[Scooterman]

What I said was what I said & was told by a mechanical engineer not a fluid dynamics engineer but he said it would reduce the power consumed, I don't understand that myself. To me yea exactly what you said so If someone has proof or data on this I'd really like to see it, either way.

 

[Meche]

Does a mechanical engineering degree count? :lol:

{This comment was retarded}

 

[Scooterman]

Now that I don't think is true, you can vary the load input & it will change the power consumed. If you look at the load charts on the pumps that is how they specify the load current being used.

 

[Meche]

yeah I know. I was thinking about it at lunch. I was kinda sorta hopin' no one saw it.

 

[Scooterman]

Not a problem really I need a clamp on ammeter to test this but I think it is true, upon farther review I'll investigate this because of the large pump I have I may just keep it & throttle it back to save power.

 

[Meche]

Are you throttling electrically?

 

[Scooterman]

No it would be with a ball valve, this pump can be wired 220v also but I don't think you should run less voltages than the design because then you would have higher current to deal with.

 

[DonW]

No it would be with a ball valve, this pump can be wired 220v also but I don't think you should run less voltages than the design because then you would have higher current to deal with.

Heres a quicky for ya.
Genx 6000 .8 open
am3k 1.3a open
Genx 6000 .8 50%
am3k 1.3a 50%

Now the kick in the pants.
Genx open 79F
Genx 50% 81F
Am3k open 90F
Am3k 50% 9.8

Thats just quick info with a clamp on amp probe and lab scope and a infared temp transmitter and lab scope.

Don

 

[Scooterman]

Don the genX isn't a Centrifugal pump, not sure what the am3k is, if they are magnetic, that won't work on them but if the amd master is centrifugal then it is surprising, no doubt heat would be increased also, thanks for the information.

 

[DonW]

Don the genX isn't a Centrifugal pump, not sure what the am3k is, if they are magnetic, that won't work on them but if the amd master is centrifugal then it is surprising, no doubt heat would be increased also, thanks for the information.

AM3K Ampmaster 3000 is centrifugal thats why I tested both.

Don

 

[burning2nd]

since u guys are haveing a hard core pump convo ill ask.

whit the crp cs202 or the cs150, i think with the 202, i would have 2 inlets to the sump and the return in the center.

but
my question is what kinnda pump should i use? internal external? what size pipein

the head will be like 2 or 3 feet