Help with plumbing.

[mckaax]

I have a mag 950 pushing 4ft head to top of the tank. I am aslo using 6, 90's. Is it true that each 90 adds 2.6 ft of head? If so I guess I need to take the 950 back and get a???

 

[francisco5]

I get about 1000 gallons per hour returned to my display from my sump with a mag 18- 2 foot horizontal, 4 foot vertical, 1 inlet, 1 outlet, and one ball joint using 3/4" tubeing. I could get more flow with bigger tubing. How much water do you need returned to your display tank? The other big reef forum has a head loss calculator on the home page.

 

[earlybird]

Originally Posted by francisco5
I get about 1000 gallons per hour returned to my display from my sump with a mag 18- 2 foot horizontal, 4 foot vertical, 1 inlet, 1 outlet, and one ball joint using 3/4" tubeing. I could get more flow with bigger tubing. How much water do you need returned to your display tank? The other big reef forum has a head loss calculator on the home page.
How big is your sump/fuge and dt?

 

[halcyon_diver]

Originally Posted by mckaax
I have a mag 950 pushing 4ft head to top of the tank. I am aslo using 6, 90's. Is it true that each 90 adds 2.6 ft of head? If so I guess I need to take the 950 back and get a???
Yeah..its true, 1" PVC 90 is equal to 2.5' of the same size tubing and 3/4" 90's equal 2' of tubing

 

[mckaax]

What forum are you talking about?

 

[mckaax]

I just seen what you were talking about on reefcentral. It only shows about .2 head loss for each 90. I hope this is right, if so I dont have to go out and buy flexable PVC. I just spent $15 on pvc and fittings. Let me know what you think>?>?>?

 

[trippkid]

what size tank, without knowing I'd say May12 or 18 if you have two overflows should do the trick for you, maybe lose some of the 90's, can you use 45's not as much head loss.

 

[scotts]

Well you are kind of right and kind of wrong. First of all though 6 90s in a system is a lot! Is there some way you can either put in some 45s in place of the 90s or even use flexible hose to get rid of some of the 90s.
Now onto the calculation parts. According to the charts I have seen, they are equating each 10 foot section of pipe to an equivalent feet of head due to friction loss. Then they equate each 90 degree fitting to a number of feet of straight pipe, not feet of head.
So in your case lets say you have 10 feet of 1" pipe, then you have 6 90s, each 90 is equvalent to 2.25 feet of straight pipe, so that is 13.5 feet of pipe. Add these together and the total piping in your system is 23.5 feet of pipe. The total feet of head loss for this is about 6 feet. Add this to the four feet of head you said you already have and you have 10 feet of head pressure for your pump. Look at the pump curve to see what your flow would be for the pump at that amount of pressure.
Me personally I think this is WAY too much thinking and doing your guzintos. I say look about what size pump you need, maybe buy a little bigger one and use a valve on the outlet to slow it down to the flow you need.

 

[big]

Using the "Hazen -Willians" friction calculations will give you all the answers . Google the words and its all there.

 

[mckaax]

Using the calculator on rcentral I get a total 5.59 head loss using 4 90s and 4 ft vertical 1 inch pipe.

 

[jonthefishguy]

Putting 90's on your tank you lose 2.6 ft of head pressure for each one. If you use 45 to make the bend, your loss is now 2.8 on 1inch pipe and thats fact.

 

[ghettotang]

Can you send me the web site for the this section said
Originally Posted by francisco5
The other big reef forum has a head loss calculator on the home page.
My email address is JayPnoy12@aol.com.
Thanx
Jay