help with wash basin waste

[mac32bit]

Dear all

I have to replace the washbasin waste in my bathroom.

The total length of run is just over 3.5m. The existing 32mm waste runs from the bottle trap to the outside then drops down and joins vertically into the horizontal 40mm bath waste outside the building via a swept tee. Water is very slow to flow away at the moment so I want to improve flow.

Due to the total length of pipe run can I get away with 40mm diameter pipe?

Will I need an anti-syphon bottle trap?

As basin traps are normally 32mm dia can I get a basin trap with 40mm outlet?

Many thanks in advance.

 

[seco services]

whats causing it to flow slow ? has it not got enough gradient ?
if not it won't be any quicker with a larger pipe.

 

[gaspro1981]

try cleaning the carp out of the trap

 

[kirkgas]

if you decide to fit a bigger pipe the easiest way is to keep the 32mm trap and fit a short piece of 32mm pipe into the first bend (a 40mm bend with 40x32 reducer in it)

 

[mac32bit]

whats causing it to flow slow ? has it not got enough gradient ?
if not it won't be any quicker with a larger pipe.

The gradient is not good at the moment but I will make it steeper when I replace it. 20mm in 1m I heard was the correct fall.

Thanks for replying

 

[mac32bit]

try cleaning the carp out of the trap

LOL

 

[Nige F]

try cleaning the carp out of the trap

LOL

Don`t carp on , The seal has gone from the trap , you need one that works like a lobster pot , Now don`t start a crabby argument. Some of you on Plumbing Forum are like a load of Fishwives.

 

[mac32bit]

a 40mm bend with 40x32 reducer in it

Is that 2 pieces or one piece, sorry I am not to clear.

Thanks again

 

[kirkgas]

2 different things, if you want to uprade to 40mm to the drain, you need to connect the 32mm into it, so you fit a 40mm bend (with 40mm pipe in one end going to the drain) and a 40x32 reducer in the other end of the bend connected to a short piece of the original 32mm pipe.

 

[ChrisR]

Coming to a situation like this after others had tried the above and the rate was still slow, I put a 1 1/4" to 1 1/2" bush on the basin waste, then used a 1 1/2" vented P trap. Bottles traps are a bit resistive.
It was a bit quicker to empty the basin.

 

[mac32bit]

all done now! thanks for your help