Spigot and Socket Joint

The joint is also called bell and spigot joint. The enlarged end is called ‘socket’ or ‘bell’ whereas the normal end is called spigot. The normal end, i.e. spigot is fitted into the socket and proper alignment is done. The joint is made by caulking in spun yarn (jute) and then filling the remainder of the joint space by molten lead and then thoroughly caulking the lead. The molten lead solidifies quickly and makes the joint water tight.

                                                   Figure 1: A Socket and Spigot Joint

The joint is somewhat flexible and allows the pipe to be laid on flat curves without the use of special mountings. Majorly mains and sub-mains of cast iron, spun iron or steel are joined with this type of joint.