Abstract: The invention provides a marine antifouling coating composition comprising a tributyltin acrylate coresin in the range of from about 10% to about 25% by weight, a tributyltin polysiloxane coresin in the range of from about 2% to about 20% by weight, at least one filler in the range of from about 10% to about 50% by weight and a solvent in an amount of from about 20% to about 50% by weight. Preferred tributyltin acrylate coresins comprise copolymers of tributyltin methacrylate monomers and methyl methacrylate monomers.

Abstract: A device is set forth for grounding a conduit or the like. The device includes a non-conductive saddle having an arcuate inner surface to mate with the exterior of the conduit. Secured along the inner surface is a mesh strap woven of conductive fibers. The saddle is adhered to the conduit with a conductive adhesive which conducts static charges from the conduit to the strap. Opposite the saddle the strap is conductively secured to a ground.

Abstract: A corrosion-inhibiting coating composition for application onto rusted steel or iron surfaces is disclosed. The coating composition comprises an organic silicate, citric acid, and a non-aqueous solvent. The organic silicate is preferably present in an amount sufficient to provide about 12% to 24% silicon dioxide in the cured coating from the composition and is preferably pre-hydrolyzed in an amount of about 70% to 90%. Citric acid is preferably present in an amount of about 0.1 to 0.2 grams per cubic centimeter of the coating composition. Dissolution and complexation of the rust by the citric acid provides a pigment which causes the organic silicate to become a film-forming binder. Zinc chloride is preferably added to the composition to increase the rate of rust dissolution and to improve binder properties.

Abstract: A conductive flange is set forth for a fitting such as a conduit. The flange is non-conductive including at least one strand of conductive yarn in conductive contact with the conduit and extending to the flange rim where it intersects one or several bolt holes.The flange is conductively attached to the conduit such that any static electrical charges are conducted by the yarn to the ounting bolt or bolts disposed in the bolt holes. The bolts are grounded to, in turn, ground the static charge and prevent sparking.

Abstract: A conductive flanged fitting is set forth having a conductive liner at, along and throughout the inside surface of the conduit to conduct developed static electrical charges. A portion of the liner wraps over each end of the conduit. Grounded, conductive flanges are coupled to the ends by a conductive adhesive which conducts static charges from the liner portions to the flanges and to ground.

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: An insulated pipe for conducting high and low temperature fluids includes a rigid carrier pipe, a layer of volumetrically compressible insulating material around the O.D. of the carrier pipe, and a protective outer pipe around the insulating layer. The method of making the pipe product includes placing a closed flexible bag around the carrier pipe and the insulating layer, and then drawing a vacuum on the interior of the bag to compress the insulating layer. The outer pipe is slid lengthwise over the compressed insulating layer, and the vacuum is then removed to allow the insulation to partially expand and fill the annulus between the carrier pipe and the outer pipe.

Abstract: A telescoping joint for plastic pipe comprises a pair of sleeve members bonded to adjacent ends of a pair of pipe sections, a tubular body member into opposite ends of which sleeve members telescope, with O-ring seals carried by the sleeve members forming a seal against the inner surface of the body member, and tubular adaptor members which fit on the respective pipe sections adjacent the sleeve members and thread into opposite ends of the body member to provide thrust restraint precluding withdrawal of the sleeve members and the pipe sections therefrom. The joint may be used for in situ repairs of fractured pipe, or may be supplied with pipe sections bonded-in, for use in a telescoping joint or union to be coupled into a pipe line.

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: Method and apparatus for longitudinally reinforcing continuously generated, resin-impregnated fiber pipe includes deposition longitudinal reinforcing fiber elements directly onto the surface of the pipe into the nip formed between the surface of the pipe being generated and fiber elements being wound circumferentially onto the pipe. Rollers contacting the pipe at the nip guide the longitudinal deposition of fiber elements supplied from a swinging supply tube.

Abstract: A non-ferrous pipe coupling comprises tubular threaded male and female coupling elements attached to ends of respective pipe sections. The male element terminates in a cylindrical non-threaded, non-tapering sealing surface adjacent its threads and the female coupling element, which may be filament-wound, includes an internal sealing sleeve or liner with a web that provides a lip seal around the cylindrical sealing surface of the male element. The web is urged into sealing engagement with the cylindrical surface by fluid pressure within the coupling. The liner precludes egress of fluid from within the coupling through the female coupling element.

Abstract: A method for flexibilizing an epoxy resin is disclosed which comprises (a) preparing a dicarboxy-terminated prepolymer by reacting a carboxylic anhydride with a polybutadiene having a minor amount of pendant vinyl groups at a temperature from about 125.degree. to about 140.degree. F.; (b) reacting the prepolymer with an excess of liquid epoxy resin at a temperature from about 180.degree. to about 200.degree. F.; (c) adding a vinyl monomer in an amount of about 2% to about 25% of the mixture; and (d) adding epoxy and vinyl polymerization catalysts to cure the mixture.

Abstract: A repair coupling is herein disclosed which is particularly suited for use with fiber-reinforced thermosetting resin pipe. The coupling comprises a pair of inner and outer sleeves to be secured on respective end portions of a pair of pipe sections to be coupled, a tubular seal carrier, and a clamp. Each inner sleeve is axially slit and has a tapered external thread. Each outer sleeve has a complementary internal thread. The inner sleeves have internal teeth so that threading of the outer sleeves onto the inner sleeves causes the teeth to grip the respective pipe end to secure the inner and outer sleeves thereto. The seal carrier has opposed seal-carrying sections which fit into the respective pipe ends and form internal fluid seals, and a flange between the seal-carrying sections forming a spacer between the adjacent pipe ends.

Abstract: A building block made of concrete or the like comprises a front face, a back face, a top face, a bottom face, and a pair of side faces. The top face has a convex angular first surface with a vertex extending between the side faces, and a concave angular second surface with a vertex extending between the side faces. The concave second surface lies between the convex first surface and the front face of the block. The bottom face has a concave angular third surface with a vertex extending between the side faces, and a convex angular fourth surface with a vertex extending between the side faces. The convex fourth surface lies between the concave third surface and the front face. The convexity of the first and fourth surfaces matches the concavity of the third and second surfaces, respectively, thereby forming a double interlock, namely, an interlock between the first and third surfaces and an interlock between the second and fourth surfaces.

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: A marine antifouling coating composition comprises an acrylic resin such as methyl methacrylate in the range of from 6 to 20% by weight, a polysiloxane having substituted thereon tributyltin moieties that are toxic to marine organisms. The polysiloxane is in the range of from 7 to 25% by weight. The acrylic resin and polysiloxane are dissolved in a solvent in the range of from 18 to 52% by weight with the balance of the composition in the range of from 10 to 65% by weight being primarily conventional marine paint and toxicant agents for augmenting action of the tributyltin polysiloxane. Copper or copper salts that are effective for inhibiting growth of marine organisms and facilitating release of toxins can also be included.

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.