flow rates ?

fishman122 · 12/29/2006, 10:52 AM

i recently put together(not running yet) a sump with a 29 tank and plumbed it with 1" pvc, i have 2 1" lines(lines are tied together with T's and one of the lines has a ball valve on it) siphoning out of the tank to the sump, does anyone have an idea of how much this will flow, i was wanting to know so i i can size a pump for it, i have a mag 7, dolphin dp900(900gph), and a little giant 4mdqsc on hand already.

fishman122 · 12/29/2006, 01:00 PM

anyone?

luke33 · 12/29/2006, 01:31 PM

Max 1200-1400 depending on the sponges being on the syphons or if its a utube style or c syphon style. Let me know and i'll tell ya more.

pjf · 12/29/2006, 01:38 PM

Try the Head Loss Calculator. The link is on the lower left of the Reef Central home page.

I would also make use of the Drain/Overflow Calculator before buying a pump.

RandyStacyE · 12/29/2006, 02:04 PM

Are you thinking that you can simply siphon water from the display tank sump ... and match this flow rate to return water to the display tank (at the exact same rate)?

If so ... this is impossible and an absolute disaster for sure. This is a bad idea for many reasons.

1 - What if the electricity goes out? The pump will be off and the sump will flood. When the electricity comes back on, the pump will run dry and can cause serious problems.

2 - You can not match this theoretical flow rate. Even if you could ... resort to #1. Flow rate can not account for semi clogged prefilters etc...

3 - These pumps are not 'positive displacement' meaning that they do not displace a precise, consistent and calculatable amount of flow.

Iâ€™m positive that this list should be MUCH longer, but #1 should be enough.

This is why you need a proper â€˜overflowâ€™. If you do not want to drill the tank to create an internal overflow â€¦ it is best to buy a proper size â€˜siphon overflowâ€™. I like these and I highly recommend them:
http://www.aquaticeco.com/index.cfm/...etail/iid/4982

The only thing I would suggest other than the overflow in the link above is to put a Durso on the standpipe instead of the sponge prefilters.

luke33 · 12/29/2006, 02:12 PM

Agreed with Randy about using an overflow. Here's where i got mine, great overflow and no failures with this model, if done right. And a great price. http://yhst-66907246933688.stores.ya...t/quprov1.html

RandyStacyE · 12/29/2006, 04:36 PM

Quote:

Originally posted by luke33
Agreed with Randy about using an overflow. Here's where i got mine, great overflow and no failures with this model, if done right. And a great price. http://yhst-66907246933688.stores.ya...t/quprov1.html

I haven't seen those ... those overflows look nice! Good link. I would still use a Durso on one of those.

fishman122 · 12/30/2006, 12:47 AM

i will try to take some pics of it post, i drilled 2 1/4" holes in the siphons just below the water level in the tank in case the power goes out

12/29/2006, 01:38 PM	#4
pjf Premium Member Join Date: May 2005 Location: Colorado Posts: 2,954	Flow Calculators Try the Head Loss Calculator. The link is on the lower left of the Reef Central home page. I would also make use of the Drain/Overflow Calculator before buying a pump.

12/29/2006, 10:52 AM	#1
fishman122 Registered Member Join Date: Oct 2006 Location: Rainbow City, AL Posts: 60	flow rates ? i recently put together(not running yet) a sump with a 29 tank and plumbed it with 1" pvc, i have 2 1" lines(lines are tied together with T's and one of the lines has a ball valve on it) siphoning out of the tank to the sump, does anyone have an idea of how much this will flow, i was wanting to know so i i can size a pump for it, i have a mag 7, dolphin dp900(900gph), and a little giant 4mdqsc on hand already.

12/29/2006, 01:00 PM	#2
fishman122 Registered Member Join Date: Oct 2006 Location: Rainbow City, AL Posts: 60	anyone?

12/29/2006, 01:31 PM	#3
luke33 Moved On Join Date: Dec 2006 Location: Indiana Posts: 8,375	Max 1200-1400 depending on the sponges being on the syphons or if its a utube style or c syphon style. Let me know and i'll tell ya more.

12/29/2006, 02:04 PM	#5
RandyStacyE Registered Member Join Date: Nov 2003 Location: Indiana Posts: 2,659	Are you thinking that you can simply siphon water from the display tank sump ... and match this flow rate to return water to the display tank (at the exact same rate)? If so ... this is impossible and an absolute disaster for sure. This is a bad idea for many reasons. 1 - What if the electricity goes out? The pump will be off and the sump will flood. When the electricity comes back on, the pump will run dry and can cause serious problems. 2 - You can not match this theoretical flow rate. Even if you could ... resort to #1. Flow rate can not account for semi clogged prefilters etc... 3 - These pumps are not 'positive displacement' meaning that they do not displace a precise, consistent and calculatable amount of flow. Iâ€™m positive that this list should be MUCH longer, but #1 should be enough. This is why you need a proper â€˜overflowâ€™. If you do not want to drill the tank to create an internal overflow â€¦ it is best to buy a proper size â€˜siphon overflowâ€™. I like these and I highly recommend them: http://www.aquaticeco.com/index.cfm/...etail/iid/4982 The only thing I would suggest other than the overflow in the link above is to put a Durso on the standpipe instead of the sponge prefilters.

12/29/2006, 02:12 PM	#6
luke33 Moved On Join Date: Dec 2006 Location: Indiana Posts: 8,375	Agreed with Randy about using an overflow. Here's where i got mine, great overflow and no failures with this model, if done right. And a great price. http://yhst-66907246933688.stores.ya...t/quprov1.html

12/30/2006, 12:47 AM	#8
fishman122 Registered Member Join Date: Oct 2006 Location: Rainbow City, AL Posts: 60	i will try to take some pics of it post, i drilled 2 1/4" holes in the siphons just below the water level in the tank in case the power goes out