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local_lad
Joined: 09 Feb 2003
Posts: 7
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 Posted: Tue Sep 23, 2003 12:29 pm Post subject: |
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I currently have a boxed in Soil pipe in the corner of my bathroom. The bloke who delivered the shower today said that I could cut the pipe off and remove the boxing and put some sort of vent inside the room. He gave me a name for the part I needed but I have forgotten it. Is this possible as this would be more cosmetically pleasing but I don't want any foul odours? I would have about 4ft of stack remaining.
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thescruff
Joined: 24 Sep 2002
Posts: 3337
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| Posted: Tue Sep 23, 2003 4:13 pm Post subject: |
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This pipe goes through the roof as a vent?, are there any other vent pipes through the roof.
The head of the drain has to be vented to atmosphere to avoid a build up of methane gas, which is a highly inflammable/explosive hydro-carbon gas formed naturally from the underwater decomposition of organic matter.
"Durgos" or other air admittance valves are only permitted on stub stacks and secondary stacks.
The answer to your question without further info, No you can't.
scruff
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local_lad
Joined: 09 Feb 2003
Posts: 7
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| Posted: Tue Sep 23, 2003 4:52 pm Post subject: |
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Sorry - more info. Yes the pipe vents currently through the roof. This is a large house which has a number of independent soil pipes to service 3 bathrooms / WC's. Durgos is what he mentioned. I assume stub stacks and secondary stacks are branches off a properly vented main stack. I also assume that air admittance is no use for expelling the build up of gas??
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thescruff
Joined: 24 Sep 2002
Posts: 3337
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| Posted: Tue Sep 23, 2003 7:43 pm Post subject: |
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Provided the head of the drain, being the furthest inspection chamber from the sewer or septic tank is vented to atmosphere, then within reason any amount of stub stacks can be used, A stub stack being a soil or waste pipe which serves a single bathroom, for a secondary stack, a branch of the main SVP the same could apply.
As you noted an air admittance only lets air in to avoid syphonage.
The answer to your question therefore is which stack is it in the drain, if its the last No if not yes, remember the valve has to be fitted above the flood level that it serves.
scruff
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