Washine machine waste water pouring out of pipe

Alter_ego

Temporary fix - block the hole!

XEO25

plumb1_2 said:

DB1904 said:

plumb1_2 said:

Most probably small crack in the fitting, clean it off and gently move the fitting to see if there’s a split ?
Personally I would have um separate, if it blocks the both machines affected.  

Yes as FB says the standpipe is to low.

So nothing to do with the hole?

No picture when I posted. but can see it now, Never seen a hole like that in that type of fitting.
Maybe I can presume (😂)  some clown has drilled a hole to try and unblock the pipe in the past ???
As I said above always best to keep them separate, lazy plumber or bad Diy 
Quickest solution is to replace the leaking fitting, but not the best option.

Thanks very much.

Can you tell me if these 2 would suffice to resolve the issue?

https://www.screwfix.com/p/mcalpine-twin-hose-connector-40mm/206hr

https://www.screwfix.com/p/mcalpine-standpipe-appliance-trap-white-40mm/94360

Slinky

plumb1_2 said:

DB1904 said:

plumb1_2 said:

Most probably small crack in the fitting, clean it off and gently move the fitting to see if there’s a split ?
Personally I would have um separate, if it blocks the both machines affected.  

Yes as FB says the standpipe is to low.

So nothing to do with the hole?

No picture when I posted. but can see it now, Never seen a hole like that in that type of fitting.
Maybe I can presume (😂)  some clown has drilled a hole to try and unblock the pipe in the past ???
As I said above always best to keep them separate, lazy plumber or bad Diy 
Quickest solution is to replace the leaking fitting, but not the best option.

Our setup is exactly the same as this, the fitting comes with that hole made in it as you can see from the attached photo. Ours have the wastes dropping down from above and the pipes are clamped to the fittings. Ours are a dishwasher and a washing machine. We avoid having them empty at the same time, not sure if it would be a problem or not but not risking it.

Alderbank

plumb1_2 said:

DB1904 said:

plumb1_2 said:

Most probably small crack in the fitting, clean it off and gently move the fitting to see if there’s a split ?
Personally I would have um separate, if it blocks the both machines affected.  

Yes as FB says the standpipe is to low.

So nothing to do with the hole?

No picture when I posted. but can see it now, Never seen a hole like that in that type of fitting.
Maybe I can presume (😂)  some clown has drilled a hole to try and unblock the pipe in the past ???

If you are a plumber I am surprised that you have never heard of a McAlpine Twin Connector (picture below). McAlpine is a very well known manufacturer of plumbing fittings and they make the twin connector to do exactly this job.
 
The hole is not made by a clown, it is there as a syphon breaker.
The problem in this case as has already been pointed out is that the stand pipe does not go high enough, so the hydrostatic pressure from the drain pump of either wm or dishwasher will push water out through that vent hole.

I suggest the OP buys this alternative McAlpine appliance trap from Screwfix and just adds a suitable length of 40mm pipe, open at the top, to the centre connection

plumb1_2

Alderbank said:

If you are a plumber I am surprised that you have never heard of a McAlpine Twin Connector (picture below). McAlpine is a very well known manufacturer of plumbing fittings and they make the twin connector to do exactly this job.
 

Yes I am a plumber mainly commercial, and no I have never used or seen one used.
Another piece of crap, same as Mcalpine anti vac traps that leak when the sealing washer inside curls up and allows smells through the trap, and flooding when there is a blockage in the waste pipe.

Bendy_House

Almost certainly as FreeBear says - that standpipe is not tall enough/has too large a U-bend.

If you look at the standing water level in that U-bend, it should be obvious that any new waste water coming down from either the W/M or D/W will (a) have only a short upper length of pipe to fill before it overflows, and (b) have to shift quite a sizeable amount of U-bend water first, or else it'll overflow - so back to (a).

I'm guessing eh correct solution, then, is to increase the height of that upper pipe before the McAlpine goes on it, and/or make that U-bend much shallower. The first is the one to try, er, first.

Bendy_House

And the W/M waste water will most likely also be going down the D/W pipe...

NSG666

XEO25 said:

plumb1_2 said:

DB1904 said:

plumb1_2 said:

Most probably small crack in the fitting, clean it off and gently move the fitting to see if there’s a split ?
Personally I would have um separate, if it blocks the both machines affected.  

Yes as FB says the standpipe is to low.

So nothing to do with the hole?

No picture when I posted. but can see it now, Never seen a hole like that in that type of fitting.
Maybe I can presume (😂)  some clown has drilled a hole to try and unblock the pipe in the past ???
As I said above always best to keep them separate, lazy plumber or bad Diy 
Quickest solution is to replace the leaking fitting, but not the best option.

Thanks very much.

Can you tell me if these 2 would suffice to resolve the issue?

https://www.screwfix.com/p/mcalpine-twin-hose-connector-40mm/206hr

https://www.screwfix.com/p/mcalpine-standpipe-appliance-trap-white-40mm/94360

Before buying anything reassemble and adjust the upstand pipe as high as you can in the 'u-bend' as you might be able to raise it c.75-100mm in the fitting. If it still leaks then buy the new standpipe in your post.

Do make sure the waste pipe is clear all the way to the drain or wherever it goes.

Bendy_House

Look up the install instructions for that model - it'll mention the min height the hose has to be before it enters the pipe. As NSG says, I'd get the pipe up to that height before doing anything else.

XEO25

Bendy_House said:

And the W/M waste water will most likely also be going down the D/W pipe...

Will this be resolved with having the t connection higher up + the waste hoses coming in from above rather than below?