HI
We are in the process of remodeling two baths one of which has an existing tub with very slow drain (say up to 10 min to completely empty a full tub).
While the city plumbing inspector was out to have a look at the work I have completed in the other bathroom, he commented that there was no vent in the other (slow tub) line and that the S-trap needs to be removed (not my work).
Essentially the tub drains into a standard 1.5" diam. ABS P-trap then runs horizontally over two air ducts then has a pair of 135/45 elbows to zig-zag over and down before emptying into the 4" main line.
The inspector called the zig-zag arrangement an "S-trap" but it is obviously not the conventional type as there is no place in which to physically trap water.
Is the problem really a lack of vent? I assume that the fact that it is emptying into the mainline provides enough air so an anciliary vent is not required.
My assumption has always been that the horizontal run (approx.4') over the air ducts is either unsupported, poorly supported or perhaps negative slope and it is one of these things that causes the poor drainage.
The area in which these pipes are laid is very cramped and I won't have full access until I do some more demo. I would just like to know what the likely cause is so I can starting planning the proper modifications!
I can email a sketch if anyone wants.
Thanks in advance
KLF
We are in the process of remodeling two baths one of which has an existing tub with very slow drain (say up to 10 min to completely empty a full tub).
While the city plumbing inspector was out to have a look at the work I have completed in the other bathroom, he commented that there was no vent in the other (slow tub) line and that the S-trap needs to be removed (not my work).
Essentially the tub drains into a standard 1.5" diam. ABS P-trap then runs horizontally over two air ducts then has a pair of 135/45 elbows to zig-zag over and down before emptying into the 4" main line.
The inspector called the zig-zag arrangement an "S-trap" but it is obviously not the conventional type as there is no place in which to physically trap water.
Is the problem really a lack of vent? I assume that the fact that it is emptying into the mainline provides enough air so an anciliary vent is not required.
My assumption has always been that the horizontal run (approx.4') over the air ducts is either unsupported, poorly supported or perhaps negative slope and it is one of these things that causes the poor drainage.
The area in which these pipes are laid is very cramped and I won't have full access until I do some more demo. I would just like to know what the likely cause is so I can starting planning the proper modifications!
I can email a sketch if anyone wants.
Thanks in advance
KLF
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