Air through Shower Trap. Help!

[matt5791]

Hi,

I have a ground floor bathroom with a 110mm soil waste in the floor, with a converter on the top to 40mm.

It is located under a new shower and I have fed into this waste from the basin and the shower.

The waste from the basin goes under the shower tray where the waste from the shower feeds into it via a T junction, then then the one pipe goes on to the main waste outlet (the 40mm feeding into the 110 in the ground - this then goes on directly into the main sewer)

When I run the basin the shower trap bubbles as air is pushed down the waste pipe from the basin. Basin is about 6ft from the shower and the shower trap is about 18" from the T junction.

Does anyone have any ideas how I can stop this?

Is there any sort of in-line one way valve I can use to allow the air to be expelled with out taking the route of the shower trap?

Thanks veyr much for any help,

Matt

 

[ChrisR]

Typical "Spanish Hotel" plumbing!

Did you use a shower trap with a 50mm seal as required by Building Regulations?
The pipe from the shouwer should go straight to the 110, which would remove the problem.
A HepVO trap on the shower would also stop it.
Only other solution would be to increase the diameter of the pipe from at least the T junction, if not the basin, to the 110.

If the shower trap is getting SUCKED, you could add an air admittance valve to the basin, but if air is being BLOWN out, it wouldn't help.

 

[matt5791]

Typical "Spanish Hotel" plumbing!

Did you use a shower trap with a 50mm seal as required by Building Regulations?
The pipe from the shouwer should go straight to the 110, which would remove the problem.
A HepVO trap on the shower would also stop it.
Only other solution would be to increase the diameter of the pipe from at least the T junction, if not the basin, to the 110.

If the shower trap is getting SUCKED, you could add an air admittance valve to the basin, but if air is being BLOWN out, it wouldn't help.

Thanks very muchf or that!

I'll have a look at the HepVO trap - sounds like I can use this as a substitute for the exitsing trap....