Abstract: A double containment coupling is used to form a mechanical joint between double containment pipes. The coupling has an inner primary member within an outer secondary member. Two seals, one on top of the other, are fitted on top of the primary pipe which extends beyond the secondary pipe of the double containment pipe. The coupling inner member is fitted over the primary pipe and seals. An inner locking nut is threaded on the coupling inner member outer surface pushing a thrust ring onto one of the seals, sliding the seal over the other seal compressing and energizing both seals so as to create a seal between the primary pipe and the coupling inner member. A first end of a closure member is threaded onto the outer surface of the coupling outer member. An outer locking nut threaded on a second end of the closure member compresses a seal between the closure member and the secondary pipe creating a seal between the closure member and the secondary pipe outer surface.

Abstract: Fire resistant pipes and pipe fittings include a structural pipe wall formed from helically wound reinforcing fiber that is bonded together with a thermoset polymer resin selected from the group consisting of phenolic resins, siloxane-modified phenolic resins, furan resins, and mixtures thereof. In a first embodiment, a resin rich fire resistant layer is applied to the surface of the structural pipe wall. The carrier is capable of accommodating a large amount of resin. The resin used to impregnate the carrier is selected from the same group of resins used to form the structural pipe wall. It is desired that both resins be compatible, and preferably be the same, to facilitate forming a bond between the structural pipe wall and the fire resistant layer during cure.

Abstract: Fire resistant pipes and pipe fittings include a structural pipe wall formed from helically wound reinforcing fiber that is bonded together with a thermoset polymer resin selected from the group consisting of phenolic resins, siloxane-modified phenolic resins, furan resins, and mixtures thereof. A jacket is disposed around the structural pipe wall and comprises alternating release layers and fiber-reinforced resin layers. The release layer is formed from a material that is incompatible with the resin of the structural pipe wall and fiber-reinforced resin layers, and is energy absorbing to improve impact resistance and reduce thermal stress. The jacket is formed having a sufficient number of alternating layers, having sufficient layer thicknesses, to protect the structural pipe wall from heat induced failure produced by exposing the outermost pipe wall to a 1,000.degree. C. flame for at least five minutes in a dry condition.

Abstract: Fiber-reinforced resin pipes and pipe fittings have a structural pipe wall formed from helically wound reinforcing fiber that is bonded together with a polymer resin. An intermediate layer is disposed around the structural pipe wall, and a fiber-reinforced layer is disposed around the intermediate layer. The intermediate layer is formed from material selected from the group consisting of impact attenuating and impact absorbing materials. The fiber-reinforced resin layer comprises layers of helically wound reinforcing fiber bonded together with a polymer resin. The materials selected to form the fiber-reinforced resin layer can be the same or different from that used to form the structural pipe wall. The pipe may comprise a single intermediate and fiber-reinforced layer disposed around the structural pipe wall, or may comprise an impact resistant jacket disposed around the structural pipe wall, wherein the jacket is made up of alternating intermediate and fiber-reinforced resin layers.

Abstract: A fire resistant sprinkler coupling for fire resistant composite pipe having a stainless steel pipe coupling having a first portion for attachment of a nozzle and a second portion adapted to receive a nipple. The nipple extends through a wall of the composite fire resistant pipe and into a stainless steel anchor sleeve for securing the pipe coupling to the composite fire pipe. An outer protective jacket is positioned on an outer surface of the composite fire steel sleeve and insulation pipe around the nipple and at least a portion of the pipe coupling. The outer protective jacket comprises a stainless steel sleeve and an insulation layer. Alternatively, the outer protective jacket includes a structural wall comprising layers of helically wound reenforcing fiber that is bonded together with a thermoset polymer resin selected from the group consisting of phenolic resins, siloxane-modified phenolic resins, furan resins, and mixtures thereof.

Abstract: A prestress wire splicing apparatus is used to replace sections of wire used in prestressing concrete pipe, where a section of wire has either failed due to corrosion or has been removed for inspection purposes, and to restore the proper amount of tension necessary to keep the concrete pipe in a net overall compression force. The prestress wire splicing apparatus comprises a set of anchor blocks for attachment to the ends of wires, a stop screw for holding a set of the anchor blocks apart, a clamp bolt for securing a set of the blocks together, and a hydraulic clamping device for pressing a set of blocks toward each other. A splice-wire anchor block is attached to each end of a splice wire. An exposed-wire anchor block is attached to each remaining wire end. A clamping device is attached and operated to compress the anchor blocks together to a desired tension force. A clamp bolt is tightened to maintain the tension and the clamping device is removed.

Abstract: A fiber reinforced plastic pipe tee is formed by winding glass rovings around a mandrel in a plurality of wrap patterns which collectively cover the pipe tee. A tape having synthetic fiber warp and glass roving weft is included in wrapping of the pipe tee. Such glass reinforcing fibers are oriented in the tee for resisting biaxial stresses. A bulge is provided on each side of the pipe tee in the diaphragm area for resisting biaxial stresses without introducing problems in winding the pipe tee.

Abstract: A fiber reinforced plastic pipe tee is formed by winding glass rovings around a mandrel in a plurality of wrap patterns which collectively cover the pipe tee. A tape having synthetic fiber warp and glass roving weft is included in wrapping of the pipe tee. Such glass reinforcing fibers are oriented in the tee for resisting biaxial stresses. A bulge is provided on each side of the pipe tee in the diaphragm area for resisting biaxial stresses without introducing problems in winding the pipe tee.

Abstract: Resin-coated filaments wound around a mandrel to make a plastic pipe or fittings. In making a fitting with a nonlinear axis, the mandrel is supported with one end adjacent a winding station and rotated about an axis substantially tangent to the nonlinear axis at the winding station. The rotating mandrel oscillates back and forth past the winding station while maintaining the nonlinear axis substantially tangent to the axis of rotation. Resin-coated filaments pass between longitudinally spaced and curved guide fingers and are wrapped around the rotating mandrel in overlapping helical patterns as it moves back and forth past the winding station. The mandrel is removed from the fitting after the resin has cured.

Abstract: A fiber reinforced plastic pipe tee is wound around a mandrel according to this method and apparatus. Fiber rovings are delivered to the mandrel by way of a delivery ring translated in an X-Y plane. The mandrel can be rotated around an A axis parallel to the X direction or a B axis parallel to the Y direction. By switching between either rotation around the A axis or around the B axis, a three axis numerical control system can be employed. Means are provided for alternately rotating the mandrel around the A and B axes. Means are provided for independently translating the delivery ring in the X and Y directions as the mandrel rotates. The delivery ring comprises a curved bar around which a band of resin impregnated rovings makes a turn enroute to the mandrel for maintaining a reasonably constant width of the band of rovings.

Abstract: A fiber reinforced plastic pipe tee is formed by winding glass rovings around a mandrel in a plurality of wrap patterns which collectively cover the pipe tee. A tape having synthetic fiber warp and glass roving weft is included in wrapping of the pipe tee. Such glass reinforcing fibers are oriented in the tee for resisting biaxial stresses. A bulge is provided on each side of the pipe tee in the diaphragm area for resisting biaxial stresses without introducing problems in winding the pipe tee.

Abstract: A fiber reinforced plastic pipe tee is wound around a mandrel according to this method and apparatus. Fiber rovings are delivered to the mandrel by way of a delivery ring translated in an X-Y plane. The mandrel can be rotated around an A axis parallel to the X direction or a B axis parallel to the Y direction. By switching between either rotation around the A axis or around the B axis, a three axis numerical control system can be employed. Means are provided for alternately rotating the mandrel around the A and B axes. Means are provided for independently translating the delivery ring in the X and Y directions as the mandrel rotates. The delivery ring comprises a curved bar around which a band of resin impregnated rovings makes a turn enroute to the mandrel for maintaining a reasonably constant width of the band of rovings.

Abstract: Resin-coated filaments wound around a mandrel to make a plastic pipe or fittings. In making a fitting with a nonlinear axis, the mandrel is supported with one end adjacent a winding station and rotated about an axis substantially tangent to the nonlinear axis at the winding station. The rotating mandrel oscillates back and forth past the winding station while maintaining the nonlinear axis substantially tangent to the axis of rotation. Resin-coated filaments pass between longitudinally spaced and curved guide fingers and are wrapped around the rotating mandrel in overlapping helical patterns as it moves back and forth past the winding station. The mandrel is removed from the fitting after the resin has cured.

Abstract: Resin-coated filaments wound around a mandrel to make a plastic pipe or fittings. In making a fitting with a nonlinear axis, the mandrel is supported with one end adjacent a winding station and rotated about an axis substantially tangent to the nonlinear axis at the winding station. The rotating mandrel oscillates back and forth past the winding station while maintaining the nonlinear axis substantially tangent to the axis of rotation. Resin-coated filaments pass between longitudinally spaced and curved guide fingers and are wrapped around the rotating mandrel in overlapping helical patterns as it moves back and forth past the winding station. The mandrel is removed from the fitting after the resin has cured.