If a bath has its own waste pipe and bosses in to a 110mm soil stack without any other appliances attached to this boss. Does it then not need an anti vac trap. The same for any appliance that has its own waste pipe to a boss in to a soil stack. Are they just needed when combining wastes?
When are anti-vac traps needed?
- Thread starter Fallout
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What size of trap seal? Only thing I would add is stay within recommended length and dia for a given fixtures waste outlet. Outside that if there's a high flow waste, it could suffer from self syphoning and might need an anti vac and/or up size. If it gurgles, it's pulling, and an av will usually sort it.
Hep V O waste valves are the answer
Also good for seldom used wastes where there is a chance of them drying out!
75MM depth seal are you recommending always fitting anti vac traps on a bath?
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Bath traps seldom self syphon due to the slow "run off" into waste , induced syphonage is usually the issue regarding loss of trap seal.
Design/install soil and wastes correctly then an anti vac trap is unnecessary.
Design/install soil and wastes correctly then an anti vac trap is unnecessary.
Not at all Fallout, only if needed, as pointed out. Some of the new bespoke wastes for baths are high flow, that coupled with long pipe runs/fall from a single waste can sometimes create self syphonage and it's more a noisy drain rather than emptying the trap.
Seen it a few times but as always, the rule of thumb is, correct fall and length of run and then there should be no need to add anything else. If the trap gurgles and the customer complains about it then an AV would usually sort it.
Seen it a few times but as always, the rule of thumb is, correct fall and length of run and then there should be no need to add anything else. If the trap gurgles and the customer complains about it then an AV would usually sort it.
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