Washing machine waste trap into sink waste trap?

paddy147

Does a washing machine needs its own completely seperate waste water trap out to the shore,or can the trap be merged into the sink waste water trap pipe outside the kitchen wall?

The way its done is the washing machine waste pipe links into the sink waste pipe (as shown in the pics).

But when you run the sink taps,and the water goes out to the shore outside,you can hear some water comming back into the washing machine pipe.

Is this ok or normal??

My concern is that if the washing machine is on and the sink tap is on at the same time,then there could be a back flow up to the washing machine and water could flood out.

Am I right to be concerned?

rx8

Hi,
The washing machine outlet hose is about 2 feet off the ground, so no water could go into this pipe.
This doesn't seem to be any worry at all,maybe jam some paper or something into the top of the waste-pipe to deaden the sound.

paddy147

rx8 wrote: »

Hi,
The washing machine outlet hose is about 2 feet off the ground, so no water could go into this pipe.
This doesn't seem to be any worry at all,maybe jam some paper or something into the top of the waste-pipe to deaden the sound.

Thanks for that.

Its just that in my mothers house there are 2 seperate pipes that go out and down to the shore.And I had never seen a washing machine pipe and sink pipe merged into 1,up until now.

So I was just wondering if it was ok and done correctly this way.

dathi

there is no trap on your washing machine pipe thats why you can hear the sink also air and smells can come back into the room most of the big hardware sheds sell a piece which allows you to seal the end of the pipe and conect the washing machine to it

cuculainn

Sorry for hijacking this post, but I have a similar question.

we have a similar set up to what the OP set up and its fine. never had an issue.

However, we plan on installing a dishwasher and the only way I can do this is by connecting the dishwasher outlet to the sink outlet, meaning the washing machine, dishwasher and sink would all run into the one outlet. WOuld anyone see a problem with that?

We also plan on taking the hot and cold water from the pipes going to the washing machine......Not a plummer so any opinions/advice welcome

Joey the lips

In this thread there will be no problem with any of the options.

In the first question i would take the u bracket off the hose and shove it right down into the pipe. if your worried plug it with newspaper to stop air but really dont bother,.


In the last request by a double applience trap they are a little harder to get but are available. That way you can connect the dishwasher and washingmachine.

rx8

This is what you are looking for,I have my dishwasher connected on the left, and the washing machine on the right, never had any problems even when both machines are on at the same time.
I'm fairly sure you would pick one up in B&Q.
As for the water supply, as far as I remember,the dishwasher is cold fill only,so a 'Y' connector could be used to split the supply going to the washing machine.

yoshytoshy

rx8 wrote: »

This is what you are looking for,I have my dishwasher connected on the left, and the washing machine on the right, never had any problems even when both machines are on at the same time.
I'm fairly sure you would pick one up in B&Q.
As for the water supply, as far as I remember,the dishwasher is cold fill only,so a 'Y' connector could be used to split the supply going to the washing machine.

It's really not advisable to use these type of connections ,unless you've no other option.

Kitchen sinks can often get blocked and this means the machine water ends up all over the kitchen.

rx8

yoshytoshy wrote: »

It's really not advisable to use these type of connections ,unless you've no other option.

Kitchen sinks can often get blocked and this means the machine water ends up all over the kitchen.

Do tell why it's not advisable?
Should you run 3 seperate wastes instead?
As I said in my post above, i've never had a problem and both machines are used quite a bit.
As for the sink, the trap could get blocked,but surely someone would notice this. If you are careful about what goes down it, as you should be, you won't have a problem.

Joey the lips

yoshytoshy wrote: »

It's really not advisable to use these type of connections ,unless you've no other option.

Kitchen sinks can often get blocked and this means the machine water ends up all over the kitchen.

I usually never dispute you but while I understand you I have never seen any trouble.

I think it would make far more sense to say

"If you use this method dont use your machine or dishwasher if the sink is blocked"

Joey the lips

rx8 wrote: »

This is what you are looking for,I have my dishwasher connected on the left, and the washing machine on the right, never had any problems even when both machines are on at the same time.
I'm fairly sure you would pick one up in B&Q.
As for the water supply, as far as I remember,the dishwasher is cold fill only,so a 'Y' connector could be used to split the supply going to the washing machine.

This is a double applience trap...although if it were me instead of those entering at the 4 and 7 position I would enter them at 11 and 2 in otherwords...turn the spiggots around.

But if its not broke.

yoshytoshy

rx8 wrote: »

Do tell why it's not advisable?
Should you run 3 seperate wastes instead?
As I said in my post above, i've never had a problem and both machines are used quite a bit.
As for the sink, the trap could get blocked,but surely someone would notice this. If you are careful about what goes down it, as you should be, you won't have a problem.

Hold on while I get off my diy high horse here

Trying to antagonize someone who works at something ,good job there.

When you do a few calls to apartments ,where people have left the machine on when they go out to work and you see the mess that it causes.
You'll begin to understand why it's a last resort.

paddy147

The kitchen place (In House) have also advized me not to use this plumbing kit for hooking up both a dishwasher and washing machine for the very same reason.

They call it BACK FLOW, and a result of this will be flooded appliences and a flooded kitchen.

1 seperate waste water trap for the washing machine,and then its ok to link dish washer into the sink waste trap.

A standard 40mm waste trap will not be able to cope with water from all appliences and the sink too,according the kitchen guy in In House..

His advice is,dont link all 3 into the 1 waste trap,as its an accident waiting to happen.

That is the advice I was given today.

Outkast_IRE

I would be of the opinion that the double appliances connected to waste trap is perfectly fine as long as the Waste pipe run is short,and you are sure that the waste pipe isnt partially blocked and has the correct fall to remove debris .

I could see a problem where people hook these up to an old waste pipe where it is partially blocked from debris etc over the years.

A full bore 1 1/2 inch abs pipe will take all 3 no problem , i just put this set up in at home and to test it out i filled the sink to the brim , and using jubilee clips and hose ran mains water into where the appliance wastes connect , the sink emptied quickly as ever and there was no issue .

This setup will become more common as kitchens are redone and with no space behind the intergrated machines people will opt for this method.
There is nothing wrong with it as long as your sure the trap and waste pipe are running fine at full flow.

Buford T Justice

When I did my kitchen, I plumbed the sink on its own, and used a twin appliance trap with a one way valve at the top of it, to let air in and not out (keep in those nasty niffs)

Both of these wastes then T together and flow out the wall in the same pipe. Keeps the gurgling noises out of the sink when the dishwasher is running

paddy147

Fingers McGee wrote: »

When I did my kitchen, I plumbed the sink on its own, and used a twin appliance trap with a one way valve at the top of it, to let air in and not out (keep in those nasty niffs)

Both of these wastes then T together and flow out the wall in the same pipe. Keeps the gurgling noises out of the sink when the dishwasher is running

dont suppose you could throw up a pic of your setup?

Thanks.:)

Buford T Justice

Sorry, been flat out the last few days. Not sure where the camera is, I had a quick scoot for it there. will see if I can nab it tomorrow and take a pic

Buford T Justice

Below is my setup under the sink. I made it myself after there was no kit with the sink
To the right of this set up, is an appliance upstand with a p trap, and two inlet nozzles on it, with a one way valve on top. They are t'd together down below