ASBESTOS CEMENT PIPES
Asbestos Cement (AC) pipes are no longer produced, as a consequence of WHS issues concerning the mining of asbestos and production of the pipes. However, they are still found in abundance in North America, Asia and Australia.
Two broad types of pipes exist – depending upon the period/s of manufacture. They are typically joined by collars, and use cast iron or ductile iron fittings, such as tees and tapping saddles.
The material exhibits lower strength than metal pipes, but is relatively thick. It undergoes degradation by the leaching of cement matrix, leaving a softened and weakened pipe wall. It is prone to failure from impact loads, and in smaller diameters from beam loading.