Washing Machine Waste Pipe

[littlepigeon]

Hi all,

After a bit of advice.

Our kitchen has been designed for us by B&Q. The integrated washer has been placed on an internal wall meaning the need for a run of waste pipe around the outside of the kitchen.

1 - What is the smallest pipe i can run, as the pipe will need to go behind the cooker at one point in the run.

2 - Will i be ok installing the P trap near the washing machine as high as possible under the units, then having a gradual fall after the p trap, round the kitchen then out of the external wall?

The run is aprox 4 meters, with two corners to go round. Is there anything that will stop this working, or as long as i have a fall will it be ok?

Many thanks

 

[Madrab]

For a washing machine then you really want 40mm pipe to avoid any issues with the pipe not being large enough.
You really shouldn't have more than 3m on a 40mm run of pipe without adding an air admittance valve further down the pipework but you should be ok. Unless building control are involved.
You can fit the P-Trap anywhere you like but with something like that then you can consider other types, say a running trap with an air admittance valve in it, further down the run.

 

[Hugh Jaleak]

I would use swept bends as opposed to 90's, allows smoother flow, and if using solvent weld waste provide rodding eyes to allow access to clear should pipework ever bung up.

 

[littlepigeon]

For a washing machine then you really want 40mm pipe to avoid any issues with the pipe not being large enough.
You really shouldn't have more than 3m on a 40mm run of pipe without adding an air admittance valve further down the pipework but you should be ok. Unless building control are involved.
You can fit the P-Trap anywhere you like but with something like that then you can consider other types, say a running trap with an air admittance valve in it, further down the run.

Thanks for the help. I didn't realise there was other types of traps I could use. Would there be a problem running the pipe all the way round the rooms and putting the trap closer towards the end of the run or should I be looking at the trap being as close to the washing machine as possible?

I've just seen a running trap, what benefit does this give over a p trap in my instance?

I have seen the sweeping bends and had planned on using them.

 

[Charnwood]

HepvO waterless trap. no need for AAV:

http://www.hepvo.com/

 

[longdogs]

your problem was described in the first few words - designed by B&Queue

 

[littlepigeon]

your problem was described in the first few words - designed by B&Queue

Thanks for the help!