Semi toilet
- Thread starter akhil
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Yes, it's fine as long as there is air admittance/venting elsewhere within the system.
but the building regs is a bit ambiguous as it says Ventilation of branch pipes – separate ventilation will not be needed to prevent the water seals in traps from being lost by pressures which can develop in the system if the length and slope of the branch discharge pipes do not exceed
So in which case if you just have a single toilet on a soil pipe then for pressure equalization you dont need a vent. So the only other reason to need a vent would be to release the gases but I dont understand why you would want to release the gases? dont the gases get pushed along with the waste? If building regs requires EVERY house to vent for ventilation of gases then why is the public sewer line itself not ventilated?Why should two houses only 10 metres apart each need a vent when the main public sewer line runs for miles without even a single vent? seems contradictory
So in which case if you just have a single toilet on a soil pipe then for pressure equalization you dont need a vent. So the only other reason to need a vent would be to release the gases but I dont understand why you would want to release the gases? dont the gases get pushed along with the waste? If building regs requires EVERY house to vent for ventilation of gases then why is the public sewer line itself not ventilated?Why should two houses only 10 metres apart each need a vent when the main public sewer line runs for miles without even a single vent? seems contradictory
You always get suction when flushing a toilet .
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Gases don’t move downhill , so property is the best place to vent .
The purpose of a ventilated stack (apart from venting gases) is that when the toilet is flushed, the rush of water can both run efficiently and also not pull out any other water traps on the same run on the way.
The sewers, are not normally full, so air/gases, can freely flow over the top of the sewer contents.
I don't believe standard 4" drain pipes are full either. If you imagine dropping a "solid" block of liquid down a pipe it would quickly break up through turbulence and only occupy half the width of the pipe by the time it met a horizontal section.
If you watch our inspection chamber when the loo flushes where 3 pipes meet they are all only semi-circular. The water just gurgles along in the channel and splashes a bit, but there is plenty of room above for air by the time the liquid reaches the next complete pipe.
They may not be full, but they travel vertically down, and can suck the seal from the U-bends, if not vented. The underground drains, flow almost horizontally, much slower, with lots of spare capacity, therefore there is always lots of airspace above - under normal circumstances.
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