I want to move a sink and washing machine about 5 meters, into a different
room. The problem is that I am in a flat and the existing waste outlet will
have to stay where it is.

Will there be enough fall in the waste system or will I get blockages all
the time? Any solutions?

Thanks

John G wrote:

I want to move a sink and washing machine about 5 meters, into a different
room. The problem is that I am in a flat and the existing waste outlet will
have to stay where it is.

Will there be enough fall in the waste system or will I get blockages all
the time? Any solutions?

The waste pipe from my sink (with dishwasher outlet attached)
runs for 8 metres with only a 600mm drop. I've never had a
blockage yet.
That's surprising considering the amount of rice, peas etc that
go down the plughole.
You'd need to support the pipe well so that it doesn't sag when
it's full of water.

On Sun, 19 Mar 2006 10:30:18 GMT someone who may be "John G"
wrote this:-

I want to move a sink and washing machine about 5 meters, into a different
room. The problem is that I am in a flat and the existing waste outlet will
have to stay where it is.

Will there be enough fall in the waste system or will I get blockages all
the time?

How would anyone be able to say? You haven't given enough
information.

Any solutions?

These depend on you providing some useful information.

What size is the current waste? Is it horizontal or vertical? Does
it go out through a wall, or connect to an internal stack?

If it is not possible to do the job by gravity then something like
http://www.saniflo.co.uk/Saniflo_mac....asp?name=vite
is the alternative.


--
David Hansen, Edinburgh
I will *always* explain revoked encryption keys, unless RIP prevents me
http://www.opsi.gov.uk/acts/acts2000/00023--e.htm#54

David,

Thanks

The new distance from the sink and wash m/c to a large bore vertical waste
stack will be 7m. I can choose the bore of the new waste pipe as the old
waste pipe will be completely removed

On Sun, 19 Mar 2006 13:36:11 GMT someone who may be "John G"
wrote this:-

The new distance from the sink and wash m/c to a large bore vertical waste
stack will be 7m. I can choose the bore of the new waste pipe as the old
waste pipe will be completely removed

Then this is what I would do:

1) install a new waste to a new saddle lower down on the stack.
Plastic stacks are easy, cast iron ones require more care but can be
fitted with a saddle if one is careful and gets the right sort of
saddle.

2) fit an air admittance valve. The run will be rather longer than
possible without one. I suspect this would be the case even if one
was to go up a pipe size.

3) the aim is to have a gentle slope to the stack. The steeper the
slope the more siphonage effect there will be. However, there must
be some slope. Recommended gradients for particular lengths of run
and pipe diameters are widely available, I look them up when I need
to.

4) I might install one of the better washing machine traps.
Alternatively I might provide a standpipe.

5) if I was going to continue to use the existing hot water supply
then I would insulate the new hot pipe. Whether I did use the
existing hot water supply would depend on the circumstances.

6) the hot and cold supplies should be designed to avoid air locks
by suitable gradients.


--
David Hansen, Edinburgh
I will *always* explain revoked encryption keys, unless RIP prevents me
http://www.opsi.gov.uk/acts/acts2000/00023--e.htm#54