Plumbing pump externally, do elbows on the intake side add head pressure?

trmiv · 04/24/2006, 10:58 PM

This may be a dumb question, but I'm just not sure. It's looking like I will need to plumb my Eheim 1260 externally for it to fit my tank. To do it, the pump will sit sideways to my sump. So inside the sump I will have a downturned elbow, then to a bulkhead out of the tank, then to a 90 elbow, then true union ball valve, then to the pump. Will making that turn before it gets to the pump add head pressure, or is head only added on the pressure side?

dead beat reef · 04/24/2006, 11:33 PM

Your right about the head pressure. With a 90 just before the
pump it might produce air bubbles. Water will slam into the back
wall of the 90 and turn against itself before it moves into the pump. Than you might get micro bubbles. 2 45s would help. Its
best to have the intake pipe larger than the output. So water
flows in faster in than out. I went through alot of pvc and fun
to learn this. Wish R.C. was here back than(or even P.C.s) dbr

trmiv · 04/25/2006, 12:01 AM

Well the intake is 3/4. I was going to do 1" out of the sump, 1" true union, and go down to 3/4 right before it hits the pump. The output is going to be 3/4 also. What would be better, two 45's or one 90 degree sweep elbow? Like this:
http://images.acmehardware.com/200x200/5536305.jpg

trmiv · 04/25/2006, 09:56 AM

Up, see my previous post.

04/24/2006, 10:58 PM	#1
trmiv Registered Member Join Date: Jan 2004 Location: Orlando, FL Posts: 3,082	Plumbing pump externally, do elbows on the intake side add head pressure? This may be a dumb question, but I'm just not sure. It's looking like I will need to plumb my Eheim 1260 externally for it to fit my tank. To do it, the pump will sit sideways to my sump. So inside the sump I will have a downturned elbow, then to a bulkhead out of the tank, then to a 90 elbow, then true union ball valve, then to the pump. Will making that turn before it gets to the pump add head pressure, or is head only added on the pressure side?

04/25/2006, 12:01 AM	#3
trmiv Registered Member Join Date: Jan 2004 Location: Orlando, FL Posts: 3,082	Well the intake is 3/4. I was going to do 1" out of the sump, 1" true union, and go down to 3/4 right before it hits the pump. The output is going to be 3/4 also. What would be better, two 45's or one 90 degree sweep elbow? Like this: http://images.acmehardware.com/200x200/5536305.jpg __________________ Current tank: Red Sea Reefer 350 Deluxe, Avast Marine Pegleg 180 skimmer, Gyre 150, Eheim 1262 return

04/25/2006, 09:56 AM	#4
trmiv Registered Member Join Date: Jan 2004 Location: Orlando, FL Posts: 3,082	Up, see my previous post. __________________ Current tank: Red Sea Reefer 350 Deluxe, Avast Marine Pegleg 180 skimmer, Gyre 150, Eheim 1262 return

04/24/2006, 11:33 PM	#2
dead beat reef Registered Member Join Date: Jun 2005 Location: New Mexico Posts: 279	Your right about the head pressure. With a 90 just before the pump it might produce air bubbles. Water will slam into the back wall of the 90 and turn against itself before it moves into the pump. Than you might get micro bubbles. 2 45s would help. Its best to have the intake pipe larger than the output. So water flows in faster in than out. I went through alot of pvc and fun to learn this. Wish R.C. was here back than(or even P.C.s) dbr