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Old 03-11-2011, 10:18 AM   #1
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Plumbing a sewage ejector pump


When I had a new garage built I anticipated needing a sewer line in the garage and also putting a bathroom in my basement so I had the builders install a sewage ejector pump. Now that I am preparing to design my basement bathroom I am concerned about the way the pump is plumbed in. The pump has two holes in the top. The main sewer line extends via 2" pvc straight to the ceiling of the basement and tees. The sewer line continues over about two foot where it y's into the main sewer line with the washing machine's ejector pump. The pipe diameter here is 1.5" for a few feet.

Where the sewage ejectors main line tee's at the ceiling, the other part of the tee goes up a few inches, horizontal for a foot and then 90 degrees right back down into the other hole on top of the sewage ejector basin which I assume is the vent hole.

Is this an acceptable way to plumb this device? Also could I remove the washing machine pump from the line and just have the washing machine dump into the waste line that leads to the sewage ejector pump?

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Old 03-11-2011, 10:31 AM   #2
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Plumbing a sewage ejector pump


Here is a diagram detailing macerating pump install.



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Old 03-11-2011, 10:36 AM   #3
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Plumbing a sewage ejector pump


Okay, on that picture visualize where the cleanout is. On mine, that extends right over to and cuts off the vent line and forms a loop. These guys were licensed plumbers and promised me it was up and ready to go, just needs to be plugged in. Were they lying to me?
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Old 03-11-2011, 10:59 AM   #4
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Plumbing a sewage ejector pump


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Originally Posted by noviceguy View Post
Okay, on that picture visualize where the cleanout is. On mine, that extends right over to and cuts off the vent line and forms a loop. These guys were licensed plumbers and promised me it was up and ready to go, just needs to be plugged in. Were they lying to me?
From your description, your instalation is NOT correct. The vent must extend to the roof. A loop like you describe does not allow for sewage gasses to be removed from the system and also no return air for the pump causing a vacum when the pump is activated.
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