I posted a question a couple of weeks ago about venting for adding a basin pump for a washer in the basement.
Anyway I am not in the house and have opened the walls.
It is a very simple 1940’s ranch with the kitchen sink backing up to the bathroom.
The plumbing has been “redone” and the old partial abanded.
It has a 4″ cast iron stack with branches in the wall for the lav and sink drain. Both have been abanded Then from the below the floor new ABS run.
This is the closes I can find to show how it is plumbed.
http://www.denvergov.org/admin/template3/forms/UPCIllustrations.pdf
See page 2 (UPC-12).
In this case the vent line is 4″ and (at the present nothing else is connected to it). Then on the toilet branch a line branches off for the tub. It run 5ft and the tub is not otherwise vented. AFAIK this is all OK and it would be difficult to add any other venting at the tub drain.
The lav and sink drains where just punched through the floor and S traps where installed and they combine and run a separate line and y into the sewer line just as it leaves the house. I think that S traps are illegal and also I don’t think that the venting is proper due to the long path to get back to the stack vent.
And I need to provide a vent for a basin pump that I will install in the basement.
Here is my plan oif attack.
Cut the CI stack in the wall and redo it down to where it transistion to the ABS vent/drain for the toilet/tub. That would all stay the same.
Then install new connections on the stack for the lav and sink. They would be direct connect without any other venting. About 2-3 ft arms on each, just like it was.
Then above the flood rim I would branch off for a vent line for the basin pump.
The discharge basin pump would tie in to the sewer connection at the wall where the sink & lav are now connected.
A. Am I missing anything.
B. Should the taps for the sink & lav drains to the stack be combo or sanitary Tees. I really don’t understand where one or the other is used. And from what I read I am not the only one.
C. Attacking the CI pipe. In the earlier thread it was suggested that I cut it with sawzall/carbide blade. However I only have about 1 – 1.5″ clearance between on stud and a finished wall on the other side. So I am planing on using a snap cutter. Any reason not to?
D. Supporting the CI pipe. I need to support the remaining CI pipe above this and through the roof. Since I have limited cleanace to work in I though that I would put in a spacer between the pipe and stud and then run soft iron plumber strap around it and clamp it to the stud. Any other/better way?
Replies
I'm not sure I follow your entire problem, but generally a pumped drain does not require the sort of venting concerns that a gravity drain does to perform well. This is not code, just physics.
You would want the pump outlet at the sewer system to be as close to the ceiling as practical. It can go into a vertical or horizontal drainpipe, though the water should be directed properly either way. It is supposed to have a trap, and I believe (from code recollection) a 14 inch rise from the drain entrance to the pump inlet point, though in practical terms, it matters little in this case. Make sure your pump has a checkvalve on it.
Anyways, works for me...
The basin drain is a sealed holding tank with a builtin pump.It needs venting.And it needs to vent both ways; out when filling, in when pumping out. So an air admitance vavle won't work.Or just leave the vent open and smell the stuff growing in the residual laundry water.
Bump
Im going to try to give you a blind inspection. <G>
This S traps are illegal and should be changed to prevent siphoning . Good rule there. You dont have to change existing plumbing to code but this one needs it .
Your plan of attack sounds correct unless Im missing something . This is pretty hard.
A 2 inch sanitary T can handle two 1 1/2 or 1 1/4 fixtures.
Breaking the pipe is the only way .
Every appliance must be vented with in 5 feet at least as big as its drain . You may tie in vents to one pipe to exit route . In other words you can combo vent to the stack with one pipe as long as its big enough which is also confusing somtimes.
The pump will require a 2 inch vent as as well as the combo you are plumbing .
You are right about the air admittance valves also .
I dont think you needed any help .
I saw nothing wrong with my eyes blinded . <G>
Tim
Thanks