I can't beleive I can't remember

tprize · 04/27/2009, 09:36 PM

Should your pump be more or less GPH then your overflow.

walkthedog · 04/27/2009, 09:38 PM

less.... unless you like water overflowing the tank.

SaltyDr · 04/27/2009, 09:44 PM

Less, but don't forget to calculate headloss.

tprize · 04/27/2009, 09:45 PM

Thanks, it's been so long since I've used an HOB overflow I don't remember. If I go with a larger overflow, can I put a valve on it to adjust it's flow rate? Essentially I want very little flow through my sump less then 300 gph because I am a strong believer in the fact that the sump should be used for filtering only and not for tank flow. So if I get an overflow capable of 600gph can I tune it down to less then that? Essentially in my 30 Gallon tank I would like to use the CPR cs90 because I can put in the stock man standpipe but this is 600gph and the pump I want is the panworld 40px at 480gphMax with headless not calculated.

Superstretch18 · 04/27/2009, 09:55 PM

Quote:

Originally posted by tprize
Thanks, it's been so long since I've used an HOB overflow I don't remember. If I go with a larger overflow, can I put a valve on it to adjust it's flow rate? Essentially I want very little flow through my sump less then 300 gph because I am a strong believer in the fact that the sump should be used for filtering only and not for tank flow. So if I get an overflow capable of 600gph can I tune it down to less then that? Essentially in my 30 Gallon tank I would like to use the CPR cs90 because I can put in the stock man standpipe but this is 600gph and the pump I want is the panworld 40px at 480gphMax with headless not calculated.

The overflow will only pull as much water as you put into the system. DON'T VALVE THE OVERFLOW!!! Valve the pump, so that you are putting less water in for the overflow to pull out...

kb27973 · 04/27/2009, 09:58 PM

Not sure I'm getting what your asking but the overflow will self adjust to however much your pump is pushing. So if it is pushing 300G back up to the main thats all that will go through the overflow. You only have a problem if the overflow can't handle what the pump is pushing.

Ken

tprize · 04/27/2009, 10:13 PM

That's what I wanted to know, I have heard that it's better to put a t on the output and run a valve and a line back to the sump that way you don't actually put resistance on the pump, you simply dial in how much it pushes up and how much it returns to the sump.

rendogg · 04/28/2009, 12:46 AM

mille239 · 04/28/2009, 06:20 AM

Quote:

Originally posted by tprize
That's what I wanted to know, I have heard that it's better to put a t on the output and run a valve and a line back to the sump that way you don't actually put resistance on the pump, you simply dial in how much it pushes up and how much it returns to the sump.

This is true, but depending on the pump (most flow pumps) actually use less electricity if you valve-them back than they do wide open, in which case the water simply returning to the sump would be a waste.

tprize · 04/28/2009, 08:24 AM

Hmm ok, Man I can't beleive I forgot this stuff.

LobsterOfJustice · 04/28/2009, 09:30 AM

Try to find an overflow closely matched to the GPH you will be pushing. Pushing 300GPH through a 600GPH overflow could lead to a buildup of bubbles in the tubes which breaks the siphon.

Personally, I think 300GPH is way too low.

tprize · 04/28/2009, 09:45 AM

yes but 600 is 20x my tank that will lead to microbubbles

dcombs44 · 04/28/2009, 09:51 AM

You can combat microbubbles with bubble traps and filter socks in the sump.

Easy fix. Depending on the size of your tank 600 gph is really not that much. Plus, after headloss, it won't be that much anyway.

Definitely do not put a valve on the overflow, and plus 1 on dialing back the pump saving electricity.

tprize · 04/28/2009, 12:24 PM

I didn't realize the pumps wattage would reduce. I figured it would just push hard not be able to push the water and burn up the pump!

dan223 · 04/28/2009, 01:12 PM

Quote:

Originally posted by tprize
That's what I wanted to know, I have heard that it's better to put a t on the output and run a valve and a line back to the sump that way you don't actually put resistance on the pump, you simply dial in how much it pushes up and how much it returns to the sump.

Dial it back with a valve, and use less electricity. I believe if you dial it back the impeller would spin less and create less WEAR.

dan223 · 04/28/2009, 01:14 PM

Quote:

Originally posted by tprize
I didn't realize the pumps wattage would reduce. I figured it would just push hard not be able to push the water and burn up the pump!

starving the pump or running it dry would burn it up, throttling it back some would just simulate having more head pressure

04/27/2009, 09:36 PM	#1
tprize Registered Member Join Date: Oct 2006 Location: Indianapolis, IN Posts: 1,077	I can't beleive I can't remember Should your pump be more or less GPH then your overflow.

04/27/2009, 09:58 PM	#6
kb27973 Registered Member Join Date: Jul 2004 Location: Denver, CO. Posts: 715	Not sure I'm getting what your asking but the overflow will self adjust to however much your pump is pushing. So if it is pushing 300G back up to the main thats all that will go through the overflow. You only have a problem if the overflow can't handle what the pump is pushing. Ken __________________ Sometimes I think we're alone. Sometimes I think we're not. In either case, the prospect is staggering! - Arthur C. Clarke Current Tank Info: 125G SPS - Regal Angel (3 yrs and going), Pascalus Anthia, Bartletts Anthias, spawning pairs of Six Line Wrasse, Mandarin Gobies, P. Fridmani, Gold Stripe Maroon Clowns

04/28/2009, 09:30 AM	#11
LobsterOfJustice Recovering Detritophobe Join Date: Jan 2004 Location: Cary, NC Posts: 7,443	Try to find an overflow closely matched to the GPH you will be pushing. Pushing 300GPH through a 600GPH overflow could lead to a buildup of bubbles in the tubes which breaks the siphon. Personally, I think 300GPH is way too low. __________________ If it's worth doing, it's worth doing right. I remember when zoanthids were called things like "green" and "orange" and not "reverse gorilla nipple." Current Tank Info: 180g reef with all the bells and whistles

04/28/2009, 09:51 AM	#13
dcombs44 Registered Member Join Date: Jan 2005 Location: Southern Illinois Posts: 2,913	You can combat microbubbles with bubble traps and filter socks in the sump. Easy fix. Depending on the size of your tank 600 gph is really not that much. Plus, after headloss, it won't be that much anyway. Definitely do not put a valve on the overflow, and plus 1 on dialing back the pump saving electricity. __________________ Current Setup: 10 Gallon Skimmerless Zoanthid Tank Lighting: Single 175 Watt Metal Halide (14,000 K Hamilton Lamp) Filtration: 10 gallon sump/refugium and Phosban Reactor Return: Mag Drive 700 Controller: ReefKeeper Lite (Basic Version) Circulation: TBD Age of System: Build is in Progress

04/27/2009, 09:38 PM	#2
walkthedog Registered Member Join Date: Dec 2008 Location: Charlotte,NC Posts: 370	less.... unless you like water overflowing the tank.

04/27/2009, 09:44 PM	#3
SaltyDr Registered Member Join Date: Oct 2006 Location: Southwest Florida Posts: 1,191	Less, but don't forget to calculate headloss.

04/27/2009, 09:45 PM	#4
tprize Registered Member Join Date: Oct 2006 Location: Indianapolis, IN Posts: 1,077	Thanks, it's been so long since I've used an HOB overflow I don't remember. If I go with a larger overflow, can I put a valve on it to adjust it's flow rate? Essentially I want very little flow through my sump less then 300 gph because I am a strong believer in the fact that the sump should be used for filtering only and not for tank flow. So if I get an overflow capable of 600gph can I tune it down to less then that? Essentially in my 30 Gallon tank I would like to use the CPR cs90 because I can put in the stock man standpipe but this is 600gph and the pump I want is the panworld 40px at 480gphMax with headless not calculated.

04/27/2009, 10:13 PM	#7
tprize Registered Member Join Date: Oct 2006 Location: Indianapolis, IN Posts: 1,077	That's what I wanted to know, I have heard that it's better to put a t on the output and run a valve and a line back to the sump that way you don't actually put resistance on the pump, you simply dial in how much it pushes up and how much it returns to the sump.

04/28/2009, 12:46 AM	#8
rendogg Registered Member Join Date: Sep 2006 Location: Abbotsford, B.C. Posts: 578

04/28/2009, 08:24 AM	#10
tprize Registered Member Join Date: Oct 2006 Location: Indianapolis, IN Posts: 1,077	Hmm ok, Man I can't beleive I forgot this stuff.

04/28/2009, 09:45 AM	#12
tprize Registered Member Join Date: Oct 2006 Location: Indianapolis, IN Posts: 1,077	yes but 600 is 20x my tank that will lead to microbubbles

04/28/2009, 12:24 PM	#14
tprize Registered Member Join Date: Oct 2006 Location: Indianapolis, IN Posts: 1,077	I didn't realize the pumps wattage would reduce. I figured it would just push hard not be able to push the water and burn up the pump!