Sink drain pulling vaccum on boiler condensate trap

[Taconite5]

Hi,

When I drain the sink in my kitchen I can hear the boiler bubbling, it's the condensate trap pulling water down the overflow pipe into the drain which goes into the same drain as the sink.

Is this normal?

 

[Terrywookfit]

Should be an air break to prevent it.

 

[Taconite5]

But it’s after the sink drain trap so gases from the drain can come back up then?

 

[JohnD]

Show a photo of the pipework.

 

[Taconite5]

Pic attached

 

[JohnD]

You need to show the rest of the pipes. Where they come from, where they go to, how they are connected

 

[Taconite5]

The one coming from the top to bottom is the trap for the sink into the drain. Before the trap it has a washing machine connected and a double sink.

The one coming from the left os the boiler condensate overflow

 

[JohnD]

The one coming from the top to bottom is the trap for the sink into the drain. Before the trap it has a washing machine connected and a double sink.

Show us please.

The one coming from the left os the boiler condensate overflow

And what does the rest of that pipe look like?

 

[Andy165]

That condensate 3/4" overflow pipe into the tee is bad practice. Better to have it inch and a half pipe, less chance of it blocking. If it blocks the boiler condensate will back up and shut the boiler down. Alteration needed.

 

[Taconite5]

Show us please.





And what does the rest of that pipe look like?

Pictures attached. Obviously the boiler condensate trap pipe is behind plasterboard now

 

[Bod ...]

Replace the top 90d bend with a tee and fit a durgo.

While your at it, sort that hose out for the dishwasher or washing machine. The appliance will die prematurely.

 

[Taconite5]

Replace the top 90d bend with a tee and fit a durgo.

While your at it, sort that hose out for the dishwasher or washing machine. The appliance will die prematurely.

Ah thats a good idea!

Actually found a u bend with a valve built in - this will save having to pull out all the glued sections which go into the waste

McAlpine Anti-Syphon 'P' Trap

• 75mm water seal• Universal compression outlet suits all plastic, copper and lead pipe• Anti-syphon valve neutralises negative syphonic pressure and eliminates gurgling• Manufactured in polypropylene• Conforms to BS EN 274-1:2002

www.toolstation.com

Thanks for heads up about waste pipe!

 

[Bod ...]

Ah thats a good idea!

Actually found a u bend with a valve built in - this will save having to pull out all the glued sections which go into the waste

McAlpine Anti-Syphon 'P' Trap

• 75mm water seal• Universal compression outlet suits all plastic, copper and lead pipe• Anti-syphon valve neutralises negative syphonic pressure and eliminates gurgling• Manufactured in polypropylene• Conforms to BS EN 274-1:2002

www.toolstation.com

Thanks for heads up about waste pipe!

That's worth a go. You might find that it's not big enough but its a good start.

 

[JohnD]

I'm very happy with a trapped indoor standpipe for my condensate, but that would be awkward for you to fit now the kitchen has been built over the plumbing.

 

[Taconite5]

Yeah for £10 worth a try before I start pulling out glued in pipes!