Basement Bathroom

[Trey Anderson]

Hey all. New to the forums.
I am starting to build my basement out and have a few questions about plumbing the bathroom. I have attached a few pictures. As you can see I will be using a ejection pump and already have that installed. I just have to finish the permanent electrical for it. Will the sink and the toilet vent together? Shower P trap in the rock pit?
Thanks for the advice.

 

[CT18]

That ejector pit should have its own vent attached to the vent system in the house. They usually leave a vent in the ceiling capped.

 

[Trey Anderson]

CT,
Thanks. Yes it does have one. Since I am not pumping much now, I don't have it have it hooked up yet. It is, as you said, capped in the ceiling plumbing.

 

[CT18]

You will not need to vent the fixtures since the ejector will be vented. The piping from the fixtures will terminate into the pit and not be directly connected to the sanitary system.

 

[Trey Anderson]

Fabulous!
Thanks
CT18.

 

[voletl]

you do need to vent the fixtures the main purpose of a vent is to protect the Trap seal little to do with venting of sewer gases.

 

[Diehard]

It's "sewage" pump pit, collecting toilet waste, so it IS a sanitary system subject to sewer gases!

 

[voletl]

Congratulations what's your point?

 

[Diehard]

Congratulations what's your point?

Basically the same as yours. That you cannot eliminate traps and vents as implied. (If the vents are removed from the fixtures then in effect, the traps have been removed.

 

[voletl]

I was simply correcting something that was said that was wrong all because you have fixtures draining into a sewage ejector pit doesn't mean you don't vent them every fixture needs event regardless of where it drains.

 

[Diehard]

I totally agree but simply went one step further to point out that it's still a sewage system. And by eliminating vents is implying that traps are not required.
Both traps and of course the vents for the traps cannot be eliminated.

 

[CT18]

In Michigan you vent the ejector, the individual fixtures that dump into are not vented. Its a open ended system you want have trap siphon.

 

[Diehard]

A sump or ejector must be gas tight, be equipped with an ejector pump and have a vent sized by the requirements of the codes, so as not to cause a negative pressure on the line(s) entering the sump.

A drain line from a sink, for example, would drop down into the drain line in/below the slab. In the absence of a vent that would be an S-trap and subject to siphoning.

Or even the traps that are low enough(no S-trap), are you saying that the sump is close enough to be within the acceptable distance of trap(as a typical trap arm distance) so as to prevent the drain pipe from filling and causing a siphon? Provided of course that the pipe entering the sump was at an elevation above the liquid level.

 

[CT18]

In Michigan the pit is vented not the fixtures. I doubled checked with my inspector. There are millions of old kitchen sink S traps all over the place. They rarely pull a siphon. I am not going to debate back and forth. For my code the pit is vented. What goes for the poster i am not sure on his code.

 

[Diehard]

In Michigan the pit is vented not the fixtures. I doubled checked with my inspector. There are millions of old kitchen sink S traps all over the place. They rarely pull a siphon. I am not going to debate back and forth. For my code the pit is vented. What goes for the poster i am not sure on his code.

Yes they all have to be vented, if it's a gas tight sump chamber.
Yes I've met all types of inspectors in my travels around the country. What's good for one, may not be for another.
I suppose he should check with the Plumbing inspector, assuming there's one involved.

BTW... I checked the codes and I didn't find any direct reference to it, one way or the other.

 

[voletl]

So in Michigan you're telling me I can have every drain in my house drain into a pit have no venting for any fixture and have one piece of pipe going up through my roof that vents the pit?

 

[CT18]

There may be a limitation or something as i havent done a ton of ejectors systems. I have done several industrial and a few residential ejectors and only vent was on the pit. Why would you think it would siphon, if the pit is vented to atmosphere its not a closed/air tight system. I did a laundry tub in a basement for a friend that had a pump for laundry tub and washer box and again vented the pump only. Yes the job was inspected. In Bowling Green Kentucky at the Corvette paint shop they didnt want to do any digging so all restrooms in the buildings we did were pumped, vented the pits and not the fixtures.

 

[Diehard]

I believe the main difference may be whether the sump is subject to Septage Waste.