Plastic lined dual containment piping system and method of leak detection

摘要

Methods and apparatus for improved containment, detection, and monitoring of leaks of piped substances in which piping systems are constructed of connections of flanged, plastic-lined concentric pipe segments (10,30,35), these segments each having an inner (11) and outer shell (12) with an annulus (14) therebetween and an aperture (20) connecting the annulus with the exterior flange face of the pipe segment. A connector (40) is described which may be placed between pipe segments to be connected and which has annular resilient sealing members and inner plastic seals to provide seals at the connection. The piping system provides an annular containment passageway to capture fluid escaping from the inner shell of a pipe segment and communicate the fluid to a fluid detection port in the connector. The annular containment passageway comprises at least one pipe segment annulus, at least one aperture in the pipe segment, and an annular fluid opening at the connector to communicate fluid toward the fluid detection port.