Abstract: 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, these segments each having an inner and outer shell with an annulus therebetween and an aperture connecting the annulus with the exterior flange face of the pipe segment. A connector 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.

Abstract: A valve body for insertion in a fluid line having a sampling passageway extending from the interior to the exterior of the body for sampling from or injecting ingredients into the fluid line. A first annular tapered valve seat in the passageway and a second tubular valve seat in the passageway axially aligned with the first valve seat. A valve stem moves toward and away from said valve seats and includes a first tapered valve element adapted to seat on the first seat and a second cylindrical valve element adapted to seat on the second seat. Means rotatably move the valve stem towards and away from the valve seat for wiping the sealing areas upon closing. A plastic lining covers all of the interior areas of the valve that are exposed to contact with fluid flowing through the valve. The end of the stem moves to a position generally tangent to the internal diameter of the valve body for preventing material buildup in the passageway.