Compact concrete core pipe longitudinally prestressed with pre-tensioned high tensile steel wire embedded in the concrete, circumferentially prestressed and coated with cement mortar or concrete to protect the circumference prestressing wire, to withstand internal pressure and external design loads.
They have more strength than RCC pipes and are economical compared to steel or cast iron pipes.
A welded sheet steel cylinder with steel socket and spigot rings welded to its ends, lined with concrete which is suitably compacted and circumferentially prestressed to withstand internal pressure and external design loads. Also, subsequently coated with cement mortar or concrete to protect the steel cylinder and prestressing wire
A thin steel sheet cylinder welded with thicker steel socket and spigot rings to its ends for jointing the pipe with rubber rings or for welded joints, lined with centrifugally applied cement mortar within the steel cylinder. Reinforcement consisting of continuous steel bar/wire helically wound around the outside of the cylinder and subsequently coated with dense cement mortar covering the steel cylinder.