Waste water is spent water from baths, washbasins, sinks of kitchen and similar appliances.
Waste water appliances
Waste water appliances such as washbasin, sinks, shower etc. collect and discharge waste water through traps into waste pipes. The pipes discharge waste water into a sewer directly or through a trapped drain.
Internal Diameters of Waste Appliances
The following table shows minimum internal diameters of waste appliances.
Internal Diameter (mm)
Drinking Water Fountain
Hotel and Canteen Sinks
Domestic Bath Tubs
Precautions while Executing Layout of Pipe
Pipe work and appliances should be arranged in such a way that allows close grouping of connections with water closet near main soil pipe.
The branch pipes should be kept short to reduce noise.
When the basin and bath are at some distance from the stack, it would be cheaper and simpler to combine the waste pipes into one.
Any bends in the waste pipe should be of large radius.
The pipe work in branch connections should be arranged to allow free drainage for the system.
All connections to main or branch pipes should be arranged in such a way that prevents cross flow from one appliance to another.
Branch connections should be of large radius along the invert.
The minimum diameter of soil and waste stacks should be 100 mm and 75 mm respectively.
When the pipes are covered, hard to find along the internal face of the walls, they should be of cast iron.
All pipes including those laid on external face of the wall should be of cast iron on the ground floor.
Sufficient condition should be made to access all pipe works and embedding of joints in the walls should be avoided.
All appliances connected directly to stack should be trapped.
The soil, waste and building sewer pipes should not be reduced in diameter in the direction of flow.
Cast iron fittings and branches for waste pipes should be of same quality.
A clean and germ free home is where you live fresh and healthy for long. For a healthy and germ free environment in home we need good knowledge or expert plumber who can set pipe work in a way that it helps in a good way but knowing these tips will help you make sure that the work is being done properly.
Proper drainage system is essential for waste water of the house. Traps and water seal are an important part of drainage system. Appropriate use of the appliances saves us from various diseases and foul smell in the house.
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