Plumbing: One-pipe and two-pipe systems

In older homes, a two-pipe drainage system, consisting of separate disposal for foul water and waste water, is common. Waste water is usually drained into a hopper and then to a trapped yard gulley into the main drainage.

Modern systems use a single pipe and nearly all services of waste and foul water are directly connected to this stack pipe by means of branch fittings. Exceptions are for the kitchen waste, draining to a trapped yard gulley. And in the case, for example. Of a cloakroom on the other side of the house, which would have separate branch drainage.

One-pipe, single-stack systems reduce the amount of pipework used, saving both time and money. One possible problem is that of siphonage, where the use of one appliance sucks the water seal from the trap of another, allowing foul air to penetrate the home.

This can be caused if two services are connected to a single outlet joined, in turn, to the stack in a one-pipe system. This, however, is a practice to be avoided; each connection should be made separately and directly to the stack.

10. November 2011 by admin
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