"Speedy Jim" wrote in message
...
orangetrader wrote:
I cannot do a laundry sink. A laundry sink will result in a lower
elevation
than the kitchen sink, so there is no way I will be able to run a length
of
pipe about 6' long and still be able to tie into the kitchen drain at a
higher elevation.


SNIP

Actually, you want to tie into the drain *after* the sink trap.
That would mean *lower* than the trap outlet.
And it would all be inside the wall.

The washer dumps a *huge* amount of water all at once.
The drain has to be big enough to handle that without backup.
As I said before, if the drain (in the wall) for the sink is 2"
it *should* work to add the washer. But there are venting issues
and (locally) the connection may not be permitted.

You're in uncharted waters here and I think you need some
competent advice from someone local who can look at it.

Jim


Jim:

Thanks for the comment. Yes there is a danger of backing up, but I don't
think someone local can help either. I mean there is not additional
information to be had if a local plumber or drain expert were to come out to
the property. The kitchen sink is located against an exterior wall, and all
I can see below the kitchen sink are the bottom of a double sink. The left
side drains into a garbage disposal, then a trap and then ties into the
right side drain, then a p-trap that connects into the wall. Behind the
wall, and inside the CBS wall, is the drain down and I have no idea of the
drain size there. I know there is a vent that goes straight up through the
roof and the vent size is 3" in diameter.

So unless someone opens up the concrete block wall to see the drain size,
there is nothing else that could help in formulating this decision, or is
there? One thing I do know, the kitchen sink tie in is at the downstream
most point to the street sewer. All other tie-ins are upstream of it. So I
guess venting wise if a vaccum is created, it could cause upstream toilets
to bubble? But the existing laundry line tie in used to be just upstream of
the kitchen tie in, but that line had a crack in it, which is the cause of
this whole thread.

The crack, as seen from those sewer line video cam, highly magnified, looks
like two pipes that used to connect together, sort of bust open a bit.
Downstream from it where it ties into the main line, around the bent, was a
pile of sand. Which we deduced was caused by the laundry discharge pulling
the sand in through the crack and down the line. We had to use a pipe with
reverse spray to comb some of it out to the main sewer. I wonder, if I can
reduce the flow rate of the water down that original line, will that help
not pull sand in? May be just put a laundry tub and discharge the washer
into the tub, and let the tub drain slowly down that line so as to not rush
too much water in at once? Not sure if this will work or not. Just
thinking out loud.

O