15mm pipe connected to waste pipe ? (moved)

[Gary111]

Hi, under my bath is a waste pipe, with a 15mm pipe going into it, the gap is blocked with lots of silicone, but it seems to be leaking a bit !
I'm not sure where the other end of the 15mm pipe goes

The waste pipe goes outside, and is connected to a soil pipe,( there's another waste pipe connected also which some from the sink)

This seems a very strange set up to me, I can't think why it would be done like that ?

also there's a bad smell , but I'm not sure if it's coming from this or not.

 

[Nozzle]

Over flow from your bog cistern?

Nozzle

 

[Gary111]

Thanks but, it can't be that, it's the other end of the room, at that end of the room there's a water heater tank and a kitchen sink, pretty sure it's not from the sink, I don't think heater tanks would have a waste ?

 

[nortonj]

Could be a prv/blow off of some kind maybe

 

[Madrab]

Is it copper or plastic? A pic might help, if you can add one.

 

[stem]

Overflow from the bath itself maybe?

 

[Gary111]

Thanks for this,I'm pretty sure it's coming from the electric water heater tank, it's plastic 15 MM. Going into a smallish diameter black waste pipe which goes to soil pipe

I couldn't find any kind of reducer so ended up adapting an old demijohn wine bung to seal it up

 

[nortonj]

It will be the blow off. Sounds like the electric heater hasnt been fitted correctly.

 

[Gary111]

Thanks, what would normally happen with that pipe ?

 

[nortonj]

Would normally be run in copper. The fact that it is dripping could mean a few things.
Installer didnt make a proper allowance for expansion, he has made proper allowance but it has failed or the relief valve is faulty.

 

[nortonj]

The pipe is normally terminated outside also