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Author:
gmum (IL)
Installed new sump pump. Zoeler M98
In order to get the vertical discharge pipe centered into the pit, I had to use a 90 with a street 90 turned down. There is also a check valve and a full flow ball valve on the vertical rise.
Does that cause too much turbulence in the discharge? Was this a bad idea?
its a 1/2 HP pump and it has 7' of vertical piping and about 15' of horizontal.
edit: I found that the pump spec said "max head 23'" ....
Is it as simple as taking the rise of 7' and adding a length for the fittings? (I think I read 4' for each 90?)
Edited 5 times.
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Author:
m & m (MD)
Your installation seems fine by your description. Was there a reason it needed to be centered? The total dynamic head factors in the total pipe length, lift, fittings, valves, check valve, etc. to arrive at a number. You are well under that number and even if you were over, it would just diminish your total GPH. Very nice pump!
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Author:
gmum (IL)
Thank you, I feel a little better.
But would someone be so kind to help me do the math? So I can see that I am under the max...
The descriptions for calculation are very hard for me to understand. The closest I can gather is that each 90 accounts for 4' of pipe. At 3x90= 12'. Then I have 7' of vertical rise for a total of 19' of rise. Which is under the MAX HEAD amount of 23'.
I don't know how the horizontal run of pipe (15'), a full flow ball valve and my check valve plays into it. Or if that is even the correct way to calculate this?
Needless to say, I am confused... I surely don't want to burn my new pump out or otherwise tax it.
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Author:
hj (AZ)
The HEIGHT of the discharge is the only think you have to be concerned about. The flow velocity is not enough to generate "friction loss" due to the fittings.
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Author:
Paul48 (CT)
[www.freecalc.com]
They are 2 different things. Total equivalent length is used to determine friction loss. It's not a matter of just adding the equivalent lengths for fittings and then saying I have 7' of straight pipe, and 12' (EL) of elbows, so my head loss is 19'. Plug your numbers into that calculator.
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Author:
hj (AZ)
The pump has a maximum head of 23'. As long as you do NOT try to lift the water higher than that, the pump will work just fine. More than that and the pump will not pump anything. You are confusing a sewage pump with a water pressure pump, which IS affected by friction loss due to fittings, and even then the problem can be minimized by changing the pipe sizes.
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Author:
gmum (IL)
Thanks, I understand now.
Let me throw these scenarios out, using the 23' of vertical head max.
Say there was a horizontal run of pipe that exceeds the 23'.... this horizontal portion of pipe is sloped slightly back toward the pump? Is that horizontal portion now considered part of the static head calculation of 23' since it has to overcome the slight slope?
Also what about if a pipe went vertical, then horizontal and then vertical again.... do you just count the 2 vertical portions as one?
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Author:
hj (AZ)
The ONLY THING that is considered "head" is how HIGH the pipe rises between the pump and its final connection to a drain/sewer line.
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