Air-conditioning pipes are manufactured from classes 5 to 25 and nominal diameters of 80 mm to 600 mm with the test pressure 5 to 25 Kg/cm2.Air-conditioning pipes can meet the general requirements of water supply undertaking for rising main as well as distribution main.

In most cases good bedding of the pipes and the use of flexible joints are of greater importance in preventing failure by bending, than the strength of pipe itself. Flexible joints are used at regular intervals to provide for repairing of pipes if necessary.

The available safety against bursting under pressure and against failure in longitudinal bending, though less than that for spun iron pipes, is nevertheless adequate and increases as the pipe ages.

It is classified as class5,10,15,20 and 25, which have test pressures 5,10,15,20 and 25 Kgs/cm2. respectively.Working pressure shall not be greater than 50 % of test pressure for pumping mains and 67%
for gravity mains.