Pipes are manufactured by the filament winding process.In this process the continuous fiberglass strand roving are wound onto the outside of mandrel in a predetermined pattern under controlled tension . The roving are saturated with the resin /curing agent mixture and helical wound under a calculated winding angle .
?
The key lock joint is an integral joint . The spigot end has two grooves in which O-ring seals are mounted and a locking strip groove.
?
Due to the fact that the joint is restrained by a loose item , the locking strip , they key lock joint allows for an angular deflection . This type of joint is foolproof and quick to install . O-ring should be made of EPDM rubber , locking belt strip should be made from suitable grade of Nylon or glass reinforced Nylon and is shall be molded .