7)Sizing of Cold Water Supply Pipe
•In designing cold water supply installations, an assessment must be made of the probable maximum water flow. In most buildings it seldom happens that the total number of appliances installed are ever in use at the same time and appliances, the type of building in which they are installed, and the frequency of usage.
•The Plumbing Institute has devised a method of assessing the probable maximum demand based upon the theory of probability. With this method loading unit rating has been devised for each type of sanitary appliance based on its rate of water delivery, the time the taps are open during usage and simultaneous demand for particular type of appliance.
•It is best to determine the pipe size after the schematic drawings have been completed. Two fundamental factors governing pipe sizing are velocity and frictional factor. Velocity limited to max of 2.5 m/s and min 0.8 m/s. Friction kept below 10 m/ 100 m.
8)Plumbing Cold Water Material
•Galvanized steel pipes
•Copper tubing
•Plastic pipe
•Poly steel
•Mild steel cement line
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