sink waste pipe lenght problem

[john]

I am planning a new Kitchen. The problem is the waste pipe has to run
in a partition wall before going under the floor between the joists to
the main stack. The total run is about 8 meters in 40mm pipe. One pipe
manufacturer MARLEY warn that too long a run will cause the trap to
siphon or make noise. Is there any othe way round this. The pipe
cannot be any bigger as it wont fit in the partition wall.

Thanks.
john

 

[Andy Hall]

I am planning a new Kitchen. The problem is the waste pipe has to run
in a partition wall before going under the floor between the joists to
the main stack. The total run is about 8 meters in 40mm pipe. One pipe
manufacturer MARLEY warn that too long a run will cause the trap to
siphon or make noise. Is there any othe way round this. The pipe
cannot be any bigger as it wont fit in the partition wall.

Thanks.
john

You can put a greater slope on it than specified, and also fit an
anti-siphon trap or valve.

Then if the air pressure in the pipe goes negative relative to
atmospheric (which would have a tendency to cause the trap to gurgle
or be siphoned), air is introduced via it and not the trap.



..andy

To email, substitute .nospam with .gl

 

[Quddus]

You can put a greater slope on it than specified, and also fit an
anti-siphon trap or valve.

Then if the air pressure in the pipe goes negative relative to
atmospheric (which would have a tendency to cause the trap to gurgle
or be siphoned), air is introduced via it and not the trap.

just to add that wickes sell these and are called "gurglemaster" iirc.