Abstract: A centering support for a double-containment pipe assembly is adapted to support a plurality of primary pipes within a single containment pipe. A first support half of the centering support defines a plurality of first curved support surfaces for supporting one or more primary pipes, wherein each first curved support surface is defined by a radius greater than or equal to the outside radius of the primary pipe to be supported by the respective support surface. A second support half of the centering support similarly defines a plurality of second curved support surfaces for supporting one or more primary pipes, and each second curved support surface is defined by a radius greater than or equal to the outside radius of the primary pipe to be supported by the respective support surface.

Abstract: A double-containment piping assembly has two anchor supports, and at least one elbow fitting with an outer elbow section and an inner elbow section received within the inner elbow section. A first leg having a first inner pipe received within a first outer pipe is coupled between an anchor support and the elbow fitting. A second leg having a second inner pipe received within a second outer pipe is coupled between the other anchor support and the other side of the elbow fitting. First flexibility supports are mounted on either side of the elbow fitting, and permit axial and lateral movement of the inner pipe relative to the outer pipe in the areas of the elbow. First axial-guiding supports, which permit axial movement of the inner pipe relative to the outer pipe, but prevent lateral movement of the inner pipe, are each mounted a minimum distance from the elbow fitting between the inner and outer pipes.

Abstract: An elbow fitting for a double-containment assembly has an inner elbow section contained within an outer elbow section, and the inner elbow section is coupled to corresponding straight sections of inner pipe and the outer elbow section is coupled to corresponding straight sections of outer pipe. The inner elbow section defines a first centerline radius of curvature or a first centerline-to-end radius, and the outer elbow section defines a second centerline radius of curvature or a second centerline-to-end radius. The first centerline radius of curvature is greater than the second centerline radius of curvature, and the first centerline-to-end radius is greater than the second centerline-to-end radius, forming an expanded outer annulus space in comparison to the inner annulus space. The annulus between the inner and outer elbow sections is unobstructed permitting movement of the inner and outer elbow sections relative to each other.

Abstract: A centering support for a double containment pipe assembly of an inner pipe located within an outer pipe, has a first half defining a first surface substantially conforming to the outer surface of the inner pipe, and a second half defining a second surface substantially conforming to the outer surface of the inner pipe. The first and second surfaces are seated on the outside surface of the inner pipe, and the first and second halves are coupled together by at least one fastening member for coupling the centering support to the inner pipe.

Abstract: A centering support for a double-containment piping assembly has a body portion including an inner surface defining a central aperture for receiving and supporting the inner pipe within the outer pipe, and the inner surface is defined by a first radius of curvature. A plurality of support lugs are spaced apart from each other and project outward from the body portion, and each support lug defines an outer support surface for contacting the outer pipe. The support lugs also define corresponding recessed surfaces extending between adjacent support lugs, and each recessed surface is defined by a second radius of curvature substantially concentric with the first radius of curvature.