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Old 02-03-2012, 03:37 PM   #1
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Ejector pit depth


A friend of mine told me that a plumber told him that he needed a deeper ejector pit. Aren't they pretty standard? He's thinking of adding a basement bathromm, does that require the pit to be deeper?


Last edited by tompatrick; 02-03-2012 at 03:38 PM. Reason: misspell
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Old 02-03-2012, 05:34 PM   #2
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Ejector pit depth


It all depends on the distance between the sump pit and the fixture being served. The farther away a fixture is away from the pit then the more depth you will need to get proper slope for the drain pipe

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Old 02-03-2012, 09:46 PM   #3
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Ejector pit depth


Thanks! The bathroom he is thinking is only 8-12 ft. away. Pit has got to be 36", I think. Hmmm...
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Old 02-03-2012, 10:03 PM   #4
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Ejector pit depth


There are pre-fab ejector pit that have a matching lid so that there is a good seal and won't let gases or ordors to escape. Usually 36" tall. I have had to put some at 48" deep to get the slope I need.

At a 1/4" drop per ft on a 10' run that's 2 1/2" drop easy with a 36" pit
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Old 02-03-2012, 10:33 PM   #5
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Ejector pit depth


Thx again 101. How do you get 2 1/2" though?
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Old 02-03-2012, 11:32 PM   #6
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Ejector pit depth


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Thx again 101. How do you get 2 1/2" though?
1/4" fall per ft x 10ft = 2.5"
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Old 02-04-2012, 09:15 AM   #7
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Ejector pit depth


Wait a minute here. Are you talking SIZE of the basin itself, or how deep it sits in the hole you dug for it?


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Old 02-04-2012, 10:32 PM   #8
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Ejector pit depth


Well, I got over there today and measured the pit depth. Two feet, I thought it was three because the ones at HD were all 36". If we have to trench a drain where would that come in depth wise on the pit (let's say 10' away)? I'm thinking you have to figure for the thickness of the pipe, and depth underneath the concrete when I repour the trench after a P trap . I realize could go out and by me a $20 book on plumbing, and I will. I just like talking with you guys more. I'm a carpenter, and I'd rather have a buddy tell me or figure it out myself, lol
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Old 02-04-2012, 10:48 PM   #9
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Ejector pit depth


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Well, I got over there today and measured the pit depth. Two feet, I thought it was three because the ones at HD were all 36". If we have to trench a drain where would that come in depth wise on the pit (let's say 10' away)? I'm thinking you have to figure for the thickness of the pipe, and depth underneath the concrete when I repour the trench after a P trap . I realize could go out and by me a $20 book on plumbing, and I will. I just like talking with you guys more. I'm a carpenter, and I'd rather have a buddy tell me or figure it out myself, lol
Tom
I'm thinking the plumber was right. You will be 12" deep at the toilet that's located 10' away. So, 12" + 2.5" for grade = 14.5". That's more then half the pit depth. That will make for very short pump cycles- hard on the pump
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Old 02-04-2012, 11:32 PM   #10
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Ejector pit depth


12" deep at the toilet???
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Old 02-04-2012, 11:58 PM   #11
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Ejector pit depth


Calculate 3 1/2" for a 3 inch pipe and 10 in for a 90 off the toilet flange

equals 13 1/2 in plus another 2 1/2 in for the slope and you have 16 in total

Gat the 36 in pit

The inches add up pretty quick when your not used to laying pipe
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Old 02-05-2012, 12:06 AM   #12
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Calculate 3 1/2" for a 3 inch pipe and 10 in for a 90 off the toilet flange

equals 13 1/2 in plus another 2 1/2 in for the slope and you have 16 in total

Gat the 36 in pit

The inches add up pretty quick when your not used to laying pipe
I was being generous

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