Washing Machine Standpipe - no trap

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markyp23

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Hi all

New apartment with washing machine in a room off the kitchen.

Minor smell in the room. The washing machine appears to waste via a standpipe with no trap, ie straight down and then 90 degrees into the wall. I have no access to the other side of this wall (tiled bathroom on the other side).

Is it possible to seal the entrance to the standpipe with a silicone seal or would that cause problems for the washing machine?

it seems like it would be very difficult to connect a new standpipe in this location, as there’s not a lot of horizontal pipe to play with before it goes into the wall

many thanks!
 

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Looks like there was a trap on that pipe before.

I bet the previous owners removed it when moving .


Andy
 
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Thanks for the replies.

Out of curiosity what makes you say it looks like there was a trap before?

The 90 degree bend appears to be one continuous piece of plastic pipe which disappears into an inaccessible wall before the next joint...can a trap/junction be added to a cut plastic pipe? (Suffice to say with this basic level of understanding I won’t be undertaking the work myself!)

and final question - what’s the problem with a product like this - would creating an airtight seal cause it not to work?

KOBWA Silicone Deodorant Sealing Plug - Washing Machine Drain Pipe Connector - Pool Floor Drain Sealing Plug - Bathroom Kitchen Cleaning Tools https://www.amazon.co.uk/dp/B07G34YJ46/ref=cm_sw_r_cp_api_i_UhSQDb1MSH12A
 
markyp23 said:
Out of curiosity what makes you say it looks like there was a trap before?
Click to expand...

Because the top of the grey pipe in your second photo has a black stain around its circumference, which is indicative of there having been a compression fitting mounted to it previously (likely a 90° elbow and then a bit of pipe and then an upstand kit).
 
If you don't have much space then pop a Hepvo trap on it with a little piece of pipe out the top and drop your pipe into that.

images


Yes you need air to vent in to avoid any other traps water seal getting pulled.
 
markyp23 said:
and final question - what’s the problem with a product like this - would creating an airtight seal cause it not to work?
Click to expand...

It would seal the pipe and prevent the smells there, but at the risk of it sucking the water seal from another trap somewhere and causing smells somewhere else. As the machine is used and water pumped out, the flow of water can cause a vacuum behind it - a proper trap allows that vacuum to be relieved.

That's why you have a vented stack or an air admittance valve on a toilet stack.
 
Thanks for replies

The Hepvo trap looks like it might be the answer - next question how does the HepvO trap differ in terms of venting; is it not essentially making an air tight seal as well?

EDIT:

this pipe goes into the wall. On the other side of that wall is directly under the bath, so presumably they share the same waste...and associated vent (?)
 
markyp23 said:
On the other side of that wall is directly under the bath, so presumably they share the same waste...and associated vent (?)
Click to expand...

The bath has its own trap under the bath, the vent for that is the bath plug hole and overflow which are above the trap. If your stand pipe connects with the pipe under your bath, there will be no trap between the stand pipe and the sewer - hence the sewer smells you are suffering.

Water rushing down a pipe creates a vacuum upstream of the flowing water. The loose unsealed fit of your present discharge into the stand pipe, allows air in to releav that vacuum. Seal your discharge pipe into the stand pipe, and it will look for an alternative means to relive the vacuum. The alternative will be to suck the water out of your bath trap - the result will be sewer smells in your bath.
 
Thanks Harry

I’m beginning to understand that but I’m not sure how the HepvO trap allows for venting?
 
markyp23 said:
allows for venting
Click to expand...
Venting is a bit of a misleading adjective, basically it's not venting air out of the pipe rather it allows air to be vented into the pipe, that's why the drain pipe from the washing machine is just stuck into the top of the pipe so it's not air tight.
 
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