TWO 1" Drains

amstar · 12/27/2011, 02:58 PM

I have two 1" drains coming from each end of my tank. I want to have them meet at a T then go to my rubbermaid sump.

Off of the T would 1.5" PVC be good enough or should I go 2" PVC to my sump?

cmw · 12/27/2011, 11:42 PM

You should be fine with 1.5".

BeanAnimal · 12/27/2011, 11:53 PM

PVC Pipe I.D. for schedule 40:
1" = 1.033" I.D.
1.5" = 1.529 I.D.

So solve for the area of a circle...
(Pi * R^2) * 3.14 = cross sectional area

1" pipe has a cross sectional area of .84" square inches
1.5" pipe has a cross sectional area of 1.83 square inches

So 1.5" schedule 40 PVC pipe has a little over 2x the area of a 1" schedule 40 pipe.

That said... how the system operates (noise, etc) is very dependent on how much flow the 1" pipes are handling.

TheFishTeen · 12/28/2011, 12:04 AM

Hey, it would hurt to go up to 2"...just saying. Plus it may quiet it down.

BeanAnimal · 12/28/2011, 07:43 AM

It may also make it louder... again there are a lot of variables and without knowing more about the flow, standpipes etc...

amstar · 12/28/2011, 08:24 AM

I have made my own durso stand pipes... Havent even gotten water in the tank yet. Just trying to figure out the plumbing to the sump. Stand pipes are 1" PVC and the returns are 3/4" PVC

The flow will be a dolphin 3700 pump dialed back and feeding other equipment (skimmer, reactors etc)

So the flow/noise i should be able to help/manage by dialing back the return pump correct?

obaptista · 12/28/2011, 10:02 AM

So, all kinds of things can happen to clog a 1" line like wandering snails and fish. I would tee into a 2" pipe and dial back the pump so a partial clog of one would not overflow the display. I have an overflow with teeth and still managed to get a chromis in my single 2" overflow. If it was a one inch line, the DT would have overflowed. HTH

BeanAnimal · 12/28/2011, 12:18 PM

The problem with Durso, Stockman, and other similar standpipe designs is that they are very highly dependent on regulating airlfow to limit the siphoning effect and noise. Teeing (2) such standpipes into a single pipe only serves to complicate the interaction between the two standpipes. Using a larger (2") main pipe will limit (possibly negate) the interaction but may generate noise due to the fact that the two pipes feeding it will not fill it and there will be a large volume of air that may churn the water.

In context to your setup, it sounds like you are going to utilize (2) strainers feeding the standpipes. If that is the case, then your surface skimming is going to be limited. On the other hand, if you have two individual overflow boxes doing the surface skimming, then you are going to struggle to keep (2) Dursos balanced.

To be clear, air assisted standpipe setups are only quite over a narrow range flows based on the pipe configuration. Your results will be hit or miss based on many variables (with out without them terminating in a single large pipe).

Before you go much furhter with your setup, it may be prudent to spend some time reading about different overflow designs.

amstar · 12/28/2011, 03:53 PM

interesting. So the tank is a 6 foot long all glass tank. Each corner is drilled with two holes (a drain and a return) so in effect I do have two individual overflow boxes doing the surface skimming. each glass overflow is covered to keep tank inhabitants out. Then the overflows are all glass..... what other options are out there for a "drain" I made the "drains" with 1" PVC pipes (durso style) then drilled a hole in the top of each one and attached a valve to help "regulate" air flow. the return is just a 3/4" pvc with 3/4" loc line for the return (on each corner). The glass overflow are 20" tall each

TheFishTeen · 12/30/2011, 03:48 PM

Oh i meant

Hey, it wouldn't hurt to go up to 2"

cobra9 · 12/30/2011, 04:28 PM

Quote:

Originally Posted by amstar

I have made my own durso stand pipes... Havent even gotten water in the tank yet. Just trying to figure out the plumbing to the sump. Stand pipes are 1" PVC and the returns are 3/4" PVC

The flow will be a dolphin 3700 pump dialed back and feeding other equipment (skimmer, reactors etc)

So the flow/noise i should be able to help/manage by dialing back the return pump correct?

1 inch drains are not going to be a lot of flow on the drains....... 2 3/4 inch returns is probably fine but what are you trying to achieve flow wise?

amstar · 12/30/2011, 09:25 PM

I was thinking about doing something like this. My 1" drains have the PVC
1.5" (tapered down to the 1" bulkhead) and have my 3/4" drain as an emergency drain. This would be in each corner overflow. Then have the return come back over the top of the tank (U-tube with direction flow) maybe 3 or 4 of them at 3/4" THOUGHTS???

[IMG]

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amstar · 12/30/2011, 09:27 PM

Then have the the emergency drains 3/4" have their own line 1" PVC line from the bulkheads back to the sump then the main drains (the 1" bulkheads) go back to the sump using 1.5" PVC

12/27/2011, 02:58 PM	#1
amstar Registered Member Join Date: Aug 2008 Location: Dayton Ohio Posts: 745	TWO 1" Drains I have two 1" drains coming from each end of my tank. I want to have them meet at a T then go to my rubbermaid sump. Off of the T would 1.5" PVC be good enough or should I go 2" PVC to my sump?

12/30/2011, 09:25 PM	#12
amstar Registered Member Join Date: Aug 2008 Location: Dayton Ohio Posts: 745	I was thinking about doing something like this. My 1" drains have the PVC 1.5" (tapered down to the 1" bulkhead) and have my 3/4" drain as an emergency drain. This would be in each corner overflow. Then have the return come back over the top of the tank (U-tube with direction flow) maybe 3 or 4 of them at 3/4" THOUGHTS??? [IMG][/IMG]

12/27/2011, 11:42 PM	#2
cmw Registered Member Join Date: Dec 2005 Posts: 38	You should be fine with 1.5".

12/27/2011, 11:53 PM	#3
BeanAnimal Registered Member Join Date: Feb 2003 Location: Pittsburgh Posts: 20,772	PVC Pipe I.D. for schedule 40: 1" = 1.033" I.D. 1.5" = 1.529 I.D. So solve for the area of a circle... (Pi * R^2) * 3.14 = cross sectional area 1" pipe has a cross sectional area of .84" square inches 1.5" pipe has a cross sectional area of 1.83 square inches So 1.5" schedule 40 PVC pipe has a little over 2x the area of a 1" schedule 40 pipe. That said... how the system operates (noise, etc) is very dependent on how much flow the 1" pipes are handling.

12/28/2011, 12:04 AM	#4
TheFishTeen Registered Member. Join Date: Apr 2011 Location: Los Angeles, CA Posts: 1,677	Hey, it would hurt to go up to 2"...just saying. Plus it may quiet it down.

12/28/2011, 07:43 AM	#5
BeanAnimal Registered Member Join Date: Feb 2003 Location: Pittsburgh Posts: 20,772	It may also make it louder... again there are a lot of variables and without knowing more about the flow, standpipes etc...

12/28/2011, 08:24 AM	#6
amstar Registered Member Join Date: Aug 2008 Location: Dayton Ohio Posts: 745	I have made my own durso stand pipes... Havent even gotten water in the tank yet. Just trying to figure out the plumbing to the sump. Stand pipes are 1" PVC and the returns are 3/4" PVC The flow will be a dolphin 3700 pump dialed back and feeding other equipment (skimmer, reactors etc) So the flow/noise i should be able to help/manage by dialing back the return pump correct?

12/28/2011, 10:02 AM	#7
obaptista Back again. Join Date: Jul 2003 Location: Fairfax VA Posts: 97	So, all kinds of things can happen to clog a 1" line like wandering snails and fish. I would tee into a 2" pipe and dial back the pump so a partial clog of one would not overflow the display. I have an overflow with teeth and still managed to get a chromis in my single 2" overflow. If it was a one inch line, the DT would have overflowed. HTH

12/28/2011, 12:18 PM	#8
BeanAnimal Registered Member Join Date: Feb 2003 Location: Pittsburgh Posts: 20,772	The problem with Durso, Stockman, and other similar standpipe designs is that they are very highly dependent on regulating airlfow to limit the siphoning effect and noise. Teeing (2) such standpipes into a single pipe only serves to complicate the interaction between the two standpipes. Using a larger (2") main pipe will limit (possibly negate) the interaction but may generate noise due to the fact that the two pipes feeding it will not fill it and there will be a large volume of air that may churn the water. In context to your setup, it sounds like you are going to utilize (2) strainers feeding the standpipes. If that is the case, then your surface skimming is going to be limited. On the other hand, if you have two individual overflow boxes doing the surface skimming, then you are going to struggle to keep (2) Dursos balanced. To be clear, air assisted standpipe setups are only quite over a narrow range flows based on the pipe configuration. Your results will be hit or miss based on many variables (with out without them terminating in a single large pipe). Before you go much furhter with your setup, it may be prudent to spend some time reading about different overflow designs.

12/28/2011, 03:53 PM	#9
amstar Registered Member Join Date: Aug 2008 Location: Dayton Ohio Posts: 745	interesting. So the tank is a 6 foot long all glass tank. Each corner is drilled with two holes (a drain and a return) so in effect I do have two individual overflow boxes doing the surface skimming. each glass overflow is covered to keep tank inhabitants out. Then the overflows are all glass..... what other options are out there for a "drain" I made the "drains" with 1" PVC pipes (durso style) then drilled a hole in the top of each one and attached a valve to help "regulate" air flow. the return is just a 3/4" pvc with 3/4" loc line for the return (on each corner). The glass overflow are 20" tall each

12/30/2011, 03:48 PM	#10
TheFishTeen Registered Member. Join Date: Apr 2011 Location: Los Angeles, CA Posts: 1,677	Oh i meant Hey, it wouldn't hurt to go up to 2"

12/30/2011, 09:27 PM	#13
amstar Registered Member Join Date: Aug 2008 Location: Dayton Ohio Posts: 745	Then have the the emergency drains 3/4" have their own line 1" PVC line from the bulkheads back to the sump then the main drains (the 1" bulkheads) go back to the sump using 1.5" PVC