Hi,
I'd appreciate some advice on a soil pipe installation.
Previous we had a two story building, with two W/Cs on upper floor, connecting to a simple direct vented stack (there are no secondary vent pipes). We've added a new floor, which will have another WC. One of existing W/Cs will be removed eventually.
Here's a simple schematic of my pipework, with existing soil in green, and new pipes I'm installing in red. Everything is in 110mm, with existing in cast iron, and new in HDPE pipe.
I assume we have existing long rad bend at B, though as in solid floor I can't verify. Soil flows to final manhole in cellar, with some other junctions joining, before flowing to second manhole outside at edge of property.
It's not feasible to connect the new soil directly down to the manhole junction due to physical constraints/displacement forward/backward not show in diagram.
Questions:
- Is it recommended/advisable to have a long radius, rather than normal, 90 deg bend at point B? As the waste would have dropped about 3m vertically, it might be good help it enter the horizontal section gently? Is there a rule of thumb here as normally they seem to only be fitted when going underground?
- If a long radius is a good idea, any suggestion on dimension? I'm using Geberit HDPE and they one they have is only 10cm radius, whereas a below ground one is normally 450mm? http://catalog.geberit.com/public/product.aspx?cat=GB_GB-en_1&ch=24&p=53872
- I planned to cap the old vent A, and let the stack vent above new WC> However wondering if it might be a good idea to put a air admit. valve at A also?
Any suggestions would be very helpful.
Cheers
Rick
I'd appreciate some advice on a soil pipe installation.
Previous we had a two story building, with two W/Cs on upper floor, connecting to a simple direct vented stack (there are no secondary vent pipes). We've added a new floor, which will have another WC. One of existing W/Cs will be removed eventually.
Here's a simple schematic of my pipework, with existing soil in green, and new pipes I'm installing in red. Everything is in 110mm, with existing in cast iron, and new in HDPE pipe.
I assume we have existing long rad bend at B, though as in solid floor I can't verify. Soil flows to final manhole in cellar, with some other junctions joining, before flowing to second manhole outside at edge of property.
It's not feasible to connect the new soil directly down to the manhole junction due to physical constraints/displacement forward/backward not show in diagram.
Questions:
- Is it recommended/advisable to have a long radius, rather than normal, 90 deg bend at point B? As the waste would have dropped about 3m vertically, it might be good help it enter the horizontal section gently? Is there a rule of thumb here as normally they seem to only be fitted when going underground?
- If a long radius is a good idea, any suggestion on dimension? I'm using Geberit HDPE and they one they have is only 10cm radius, whereas a below ground one is normally 450mm? http://catalog.geberit.com/public/product.aspx?cat=GB_GB-en_1&ch=24&p=53872
- I planned to cap the old vent A, and let the stack vent above new WC> However wondering if it might be a good idea to put a air admit. valve at A also?
Any suggestions would be very helpful.
Cheers
Rick