Construction

Precautions for Waste Water Appliances

Waste water

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.

S.NO. Waste Appliance   Internal Diameter (mm)
1. Drinking Water Fountain 25
2. Wash Basin 30
3. Bidets 30
4.

Domestic Sink

40
5. Shower Bath 40
6. Hotel and Canteen Sinks 50
7. Domestic Bath Tubs 50
8. Urinals  50
9. Floor Traps 60

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.
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