Cast-iron Pipes:

Cast-iron pipes are most extensively used for the conveyance of water in water supply system due to their durability, strength, resistance to corrosion, ease in laying and simplicity in repairs and maintenance. These are joined by bell and spigot joint, expansion joint or by flanged joint.  There are two types of cast-iron pipes:

(a) Vertically cast pipes.

(b) Centrifugally cast pipes, popularly known as spun iron pipes.

Vertically cast pipes are heavy in weight and low in tensile strength but are used because of good durability. These are available in large diameter. Now this type of pipe is being replaced by spun iron pipes which are thinner and lighter in weight. Spun pipe has smoother inner surface, improved metal quality. In addition, these pipes could be made longer in length. Spun pipes are available from 80 mm to 1050 mm diameter.

The common life of cast iron pipes are about 100 year under general circumstances.