CML (Cement Mortar Lining) in a Ductile Iron Pipe has a service record unequalled in the Water Works Industry. Since the first field-applied Grey Iron Pipe in 1922, CML has undergone numerous manufacturing improvements. Today, CML is applied either by the centrifugal process or the projection method, thus maintaining excellent quality control of the CML operation. The linings produced by these methods are dense, smooth and offer very little frictional resistance to the flow of water.
Cement mortar lined Ductile Iron Pipe provides a Hazen Williams Flow Co-efficient or 'C' Value of 140 - a realistic value that is maintained in the pipe.