reducing a 1.5" drain to 1"??? Plumbing question

bridun22ajl · 03/03/2014, 07:21 PM

Hi,
I bought a used tank from someone and it has a 1.5' drain. The tank is only 40g so this drain is way overkill. My Sump is designed to drain into a filter sock and has a 1" bulkhead going into it. My question is, Can I leave the stand pipe at 1.5" and then reduce it to 1" at the bottom of the bulkhead(inside the stand, not inside the tank)?

Thanks

crn005 · 03/03/2014, 09:24 PM

It's better to change it higher than lower. It's better to have the water go through the choke point with less momentum so it's not as turbulent.

ca1ore · 03/03/2014, 09:44 PM

Don't think it really matters. Just do it wherever it is most convenient.

ReeferNC · 03/03/2014, 11:57 PM

I agree ca1ore. Once the drain fills, it won't matter where the choke point is. The lower the choke point is however, the higher pressure will be created within the drain just from the weight of the water column on top of it. This could generate a slightly higher flow rate. I doubt it would be enough to really amount to anything, just food for thought.

03/03/2014, 07:21 PM	#1
bridun22ajl Registered Member Join Date: Dec 2007 Posts: 460	reducing a 1.5" drain to 1"??? Plumbing question Hi, I bought a used tank from someone and it has a 1.5' drain. The tank is only 40g so this drain is way overkill. My Sump is designed to drain into a filter sock and has a 1" bulkhead going into it. My question is, Can I leave the stand pipe at 1.5" and then reduce it to 1" at the bottom of the bulkhead(inside the stand, not inside the tank)? Thanks

03/03/2014, 09:44 PM	#3
ca1ore Grizzled & Cynical Join Date: Apr 2006 Location: Stamford, CT Posts: 17,319	Don't think it really matters. Just do it wherever it is most convenient. __________________ Simon Got back into the hobby ..... planned to keep it simple ..... yeah, right ..... clearly I need a new plan! Pet peeve: anemones host clowns; clowns do not host anemones! Current Tank Info: 450 Reef; 120 refugium; 60 Frag Tank, 30 Introduction tank; multiple QTs

03/03/2014, 09:24 PM	#2
crn005 Registered Member Join Date: May 2012 Location: Spring, TX Posts: 744	It's better to change it higher than lower. It's better to have the water go through the choke point with less momentum so it's not as turbulent.

03/03/2014, 11:57 PM	#4
ReeferNC Registered Member Join Date: Feb 2014 Location: Asheville, NC Posts: 69	I agree ca1ore. Once the drain fills, it won't matter where the choke point is. The lower the choke point is however, the higher pressure will be created within the drain just from the weight of the water column on top of it. This could generate a slightly higher flow rate. I doubt it would be enough to really amount to anything, just food for thought.