CPC Vitrified Clay drainage (perforated) pipes are produced mostly as (1/2) or (3/4) symmetrical perforation % according to BS N 295-5 standard. Perforated vitrified clay pipes are used to drain water from under structure such as roads buildings and foundations, etc. The pipe line catches the groundwater and seepage and carry it to the collector. Vitrified clay drain pipes are laid in a gravel filter. A minimum grain size of 16mm is necessary due to the diameter of the holes in the perforated pipes.

a. ½ perforated pipes will have 7 radial holes
b. ¾ perforated pipes will have 9 radial holes.

The perforated pipes are produced on final contracts.