Abstract: A dual containment pipe system suitable for installation into an existing conduit includes an impervious containment pipe adapted to be installed as a primary containment pipe and a crush-resistant and flexible spacer element disposed about the entire external circumference of the primary containment pipe. The annular spacer is formed of a plurality of spaced apart and parallel substantially crush-resistant longitudinal members with a plurality of spaced apart parallel flexible connecting ribs bonded thereto. The longitudinal members form a uniform space when the containment pipe suitable for installation of leak detection systems including cables or based on measuring pressure differentials. The new impervious primary containment pipe may be cured in place, folded and formed, diameter reduced pipe, or any other pipe suitable for pipeline rehabilitation.

Abstract: A dual containment pipe system suitable for installation into an existing conduit includes an impervious containment pipe adapted to be installed as a primary containment pipe and a crush-resistant and flexible spacer element disposed about the entire external circumference of the primary containment pipe. The spacer is formed of a plurality of spaced apart and parallel substantially crush-resistant longitudinal members with a plurality of spaced apart parallel flexible connecting ribs bonded thereto. The longitudinal members form a uniform space when the containment pipe suitable for installation of leak detection systems including cables or based on measuring pressure differentials. The new impervious primary containment pipe may be cured in place, folded and formed, diameter reduced pipe, or any other pipe suitable for pipeline rehabilitation.

Abstract: A dual containment pipe system suitable for installation into an existing conduit includes an impervious containment pipe adapted to be installed as a primary containment pipe and a crush-resistant and flexible spacer element disposed about the entire external circumference of the primary containment pipe. The spacer is formed of a plurality of spaced apart and parallel substantially crush-resistant longitudinal members with a plurality of spaced apart parallel flexible connecting ribs bonded thereto. The longitudinal members form a uniform space when the containment pipe suitable for installation of leak detection systems including cables or based on measuring pressure differentials. The new impervious primary containment pipe may be cured in place, folded and formed, diameter reduced pipe, or any other pipe suitable for pipeline rehabilitation.

Abstract: A method and apparatus for expanding a replacement thermoplastic pipe installed within an existing conduit is provided. A pipe expansion apparatus having a flexible substantially cylindrical bladder and a relief valve to inflate the bladder to a predetermined gauge pressure and allow fluid to exit the expansion apparatus and fill and pressurize the area behind the apparatus is inserted within the collapsed pipe. Fluid, such as cold water, is introduced into the apparatus to inflate the inflatable section to conform substantially to the interior diameter and configuration of the existing conduit. As the area behind the expander fills with pressurized fluid, the expansion apparatus is pushed forward, thereby pushing and expanding the replacement pipe up against the interior of the existing conduit. Steam is injected ahead of the apparatus to maintain the replacement pipe in a heated flexible condition.

Abstract: A repair structure for the repair, mainly, of leaking pipelines. The repair structure is a bandage of absorbent material impregnated with a curable resin. The bandage is wrapped round the pipeline to form a hard seal casing when the resin cures. The bandage preferably comprises also an impermeable membrane and a vent to allow leaking medium to escape while the bandage is being applied, with the membrane innermost, and while the resin is curing. The vent comprises a bush cast around a vent sleeve and bonded to the membrane. The resin which is used to form the vent bush and the membrane is the same as that used for the impregnation of the absorbent layer so that such layer will bond to the membrane. The sleeve is removable and can be replaced by a solid plug to seal the vent bush when the rigid seal casing is formed. The casing extends over a gallery in the region of the joint so that it will act as a bellow and accomodate large relative pipe section movements without failing.

Abstract: The method discloses the lining of a lateral connection to a pipeline. The method is by remotely inserting a unit in the pipeline and everting a flexible lining tube out of an outlet in the unit directly into the lateral connection. The lining may be a flexible lining which subsequently hardens to form a rigid pipe inside the connection. The eversion of the lining tube is by means of a fluid pressure differential.

Abstract: A pipeline repairing kit comprising (a) a sealed, flexible envelope; (b) two removable means dividing said envelope into at least first, second and third compartments, said means being removable selectively to connect the first and second and third compartments without opening the sealed envelope; (c) measured quantities of the parts of a two-part curable resin system in the first and second compartments; and (d) an elongated flexible bandage member made of absorbent material disposed in said third compartment, said member including an integral closeable vent, whereby an elongated resin-soaked flexible bandage member adapted for wrapping around a pipeline can be provided by first removing the removable means between said first and second compartments to thereby mix the parts of the resin system, next removing the other removable means and bringing the mixed resin into intimate contact with said elongated flexible member, and then manually manipulating the envelope so as to thoroughly impregnate said bandage m