is this pipe layout ok? (90 elbows after p trap)

[Laubi]

hi,

just wondered if having 2x 90 elbows after the p trap like in the drawing is ok? (red section)

trying not having to dig the external wall to raise the existing waste connection pipe in the wall.

 

[johnny2007]

I haven't used 90⁰ in years.
I use the sweep elbows.
Anyhow, lots of installations are like the one in your picture.
If it's a basin and you haven't done it yet, you can use an adapter and get everything in 40mm.

 

[Laubi]

I haven't used 90⁰ in years.
I use the sweep elbows.
Anyhow, lots of installations are like the one in your picture.
If it's a basin and you haven't done it yet, you can use an adapter and get everything in 40mm.

not much point changing it to 40mm if the pipe in the wall is 32mm?

i'll see what the angles are like for the sweep elbows - maybe 92degree but can try 135 degree. only reason i've done the initial pipe section relatively level is to avoid the drawers in the vanity unit

 

[Madrab]

+1 - if you can fit swept bends then that would be better.

take it you can' t open the wall and bring the waste up to the trap outflow level? So it would be just a straight back and down

 

[Laubi]

ultimately, i could do if its absolute must but trying to avoid it as the walls just been tiled and holes screwed for brackets for the vanity

+1 - if you can fit swept bends then that would be better.

take it you can' t open the wall and bring the waste up to the trap outflow level? So it would be just a straight back and down

 

[Madrab]

P.S. if you can't then the elbows will work ok.

May be an idea to use an anti vac trap though to avoid the trap being pulled as all those bends could create a slow down in outflow and cause a bit of a vacuum.

 

[Laubi]

this is the problem i have with the drawers if using sweep (assuming the pipes would more angled towards main waste connection).

it might clash with the top lip of the bottom drawer and less room for storage as a result. the top drawer has a big cut out so should be ok unless it catched the back of the drawer

 

[Madrab]

Drawered vanity units are more suited to 'straight out the back' waste runs and not 'down the back' runs, which is why modifying the pipe in the wall would be ideal.
If that's what's there though then it needs to be worked around, swept bend at the top and a 90deg at the bottom then would probably work.

 

[Joe Fixit]

Drawered vanity units are more suited to 'straight out the back' waste runs and not 'down the back' runs, which is why modifying the pipe in the wall would be ideal.
If that's what's there though then it needs to be worked around, swept bend at the top and a 90deg at the bottom then would probably work.

Will try and do that. Will try a swept at the bottom of I can

 

[Hugh Jaleak]

Even better at the bottom if there's room would be a Tee with a Cleaning Eye fitted into the spare socket, facing into the room.

 

[Joe Fixit]

Even better at the bottom if there's room would be a Tee with a Cleaning Eye fitted into the spare socket, facing into the room.

Can't find any elbows with a cleaning eye.

Guess I would need an elbow connected to the pipe in the wall, then a t above it.

As putting a t directly onto the pipe in the wall seems like a potential of having stuff stuck at the cleaning eye end?

 

[Hugh Jaleak]

You wont find an elbow with a cleaning eye in 32mm, you need a Tee, and a cleaning eye to seal the unused socket. Fit the Tee instead of a bend. If anything gets stuck you can push it through if you ever need to open the eye to clean the pipework out.

 

[Madrab]

One of these > with one of these in the dead end
............

 

[Joe Fixit]

One of these > with one of these in the dead end
View attachment 385564............View attachment 385565

But the pipe coming out of the wall is horizontal? The dead end could collect if directly connected to it? Hence why I suggested it would be an elbow then the T?

 

[Hugh Jaleak]

But the pipe coming out of the wall is horizontal? The dead end could collect if directly connected to it? Hence why I suggested it would be an elbow then the T?

No, doesn't usually happen, the flow will 'sweep' most of the debris round with it. Opened the cleaning eye on my Utility room sink last week, first time since it was fitted about 20 years ago, after the sink was getting slow to drain. Waste pipe clear, it was the trap that was the issue.