Secondary containment system

摘要

A secondary containment piping system is composed of a plurality of modules of concentric pipe. The inner pipe carries fluid being transported, and the outer pipe provides secondary containment of fluid leaking from the inner pipe. The module consists of a length of inner pipe centred in a length of outer pipe by a series of spiders or ribs, fastened to one or both of the pipes. The ends of both inner and outer pipes are coplanar and perpendicular to the axis of the module. Successive modules are joined by simultaneously welding the inner and outer pipes of one module to the corresponding pipes of an adjacent module, the preferred material for the pipes is HDPE and the welding is accomplished using electric fusion welding techniques.