Abstract:
A thermoplastic impregnated fiberglass pipe or tube and the process for making such pipe are disclosed. The pipe or tube is made of thermoplastic impregnated fibrous roving which consists of a plurality of glass filaments, at least a portion of the filaments' surfaces being in contact with the residue produced by evaporating water from an aqueous size composition consisting of an organosilane coupling agent, a polyethylene oxide binder material, and a polypropylene thermoplastic polymer resin, wherein the composition is applied to the glass fiber during the fiber forming process. The pipe forming process includes filament winding the rovings around a spindle and thereafter heating the wound rovings to fuse the thermoplastic polymer resin.
Abstract:
A steel liner (a pipe or vessel) is wrapped with a stack of sheets of glass fiber-reinforced epoxy matrix composite arranged in angle ply pattern. The stack is cured on the liner to bond the sheets together and to the liner. The wrapped liner is then internally pressurized to cause the liner to yield while the composite remains elastic. When de-pressurized, the liner has compressive residual stress and the composite has tensile residual stress. When the resulting hybrid structure is subsequently again pressurized, it is found that the elastic regime of the liner has been extended.
Abstract:
A corrosion-resistant connection (10) for use with tubular members having externally threaded ends. The connection includes a stress-bearing sleeve member (12) having an interior surface (22) and an exterior surface; and a fiber-filled polymeric composite shell (26) having at least one internally threaded portion (46) therein, the composite shell molded to the sleeve so as to be coaxially aligned and in close conforming contact with at least a substantial portion of the interior surface of the sleeve member. The composite shell has a thickness of greater than about 0.04 inches.
Abstract:
Improved high dielectric stength unitary insulation sleeving. The insulation sleeving comprises an inner insulating (1) layer such as woven fiberglass overcoated with an insulation resin (2) such as an acrylic resin, having an additional insulating layer (3) such as fiberglass overbraided upon it. The overbraided layer (3) is secured to the inner resin-sleeving member (2) by means of an additional impregnation with an electrically insulating binder resin, such as acrylic, to secure the composite together. This material, in addition to having the requisite mechanical and electrical properties for use on coil leads, is specifically adapted to VPI processing and can be utilized reliably with minimal effort. For example, the material has comparable and, in some instances, superior dielectric breakdown voltages as compared to conventionally used sleeving and is not subject to layer slippage which can decrease electrical properties, as can occur with conventionally used materials.
Abstract:
Method comprising the winding about a hollow body (1), according to substantially jointed turns, a flexible profiled section (2) which is fixed on said hollow body. In said method, use is made of a profiled section (1) of a material of which the yield strength is higher than that of the material of the hollow body (1) and the profiled section is wound about the hollow body with a sufficient tension so that, when the hollow body (1) is under pressure, the stresses susceptible to develop in the body and in the windings of the profiled section (2) reach their admissible maximum substantially at the same time. Utilization to reinforce pipes or containers intended to be under pressure.
Abstract:
A steel liner (a pipe or vessel) is wrapped with a stack of sheets of glass fiber-reinforced epoxy matrix composite arranged in angle ply pattern. The stack is cured on the liner to bond the sheets together and to the liner. The wrapped liner is then internally pressurized to cause the liner to yield while the composite remains elastic. When de-pressurized, the liner has compressive residual stress and the composite has tensile residual stress. When the resulting hybrid structure is subsequently again pressurized, it is found that the elastic regime of the liner has been extended.
Abstract:
A composite tubular member having an outer cylindrical member (6) containing fibers oriented to resist internal pressure and provide low bending stiffness, and two inner smaller core members (4) located near the neutral axis of the composite tubular members containing fibers oriented to provide high axial stiffness, high tensile strength and low bending stiffness and fibers oriented to resist shear stress, positioned opposite each other and adjacent to the inner walls (8) of the outer cylindrical member.
Abstract:
A Coriolis flowmeter whose flow tubes are made, at least partly, of anisotrophic materials such as fiber reinforced composites. The composite material is formed by orienting the fibers in one direction to increase the tensile strength of the material in that direction. Selected areas of the flow tubes are formed of this composite to increase the flowmeter sensitivity and to separate desired flowmeter vibrational frequencies from undesired vibrational frequencies. Circumferentially oriented fibers increase the internal pressure containment capability of the flow tubes. A strain gauge affixed to the flow tubes flexes with flow tube deformation to indicate the internal flow tube pressure.
Abstract:
Structures, such as pressure vessels (10) or pipes (26), for the storage and transportation of fluids under pressure are wrapped with a composite material including a high-strength unidirectional filament material (20) in a matrix of a flexibilized isophthalic polyester resin (22) which has an elongation at least equal to the elongation of the material of the structure (10 or 26). The index of refraction of the resin is matched to the index of refraction of the filament material so that the pressure vessel is visible through the wrapping. The resin discolors (28) when exposed to a heat above which the material of the structure weakens, thus acting as an indicator that the structure is unsuitable for use.
Abstract:
Sound attenuators used in ventilation, and in particular, for positioning adjacent ventilation fans that produce noise and vibration in such industrial areas as mines or factories. Known sound attenuators for such purposes are normally constructed of bulky and heavy material such as perforated metal and solid metal thereby tending to be easily dented and damaged and susceptible to corrosion. These attenuators also use sound absorbing material that if wetted renders the attenuator substantially useless wherein the attenuator must be replaced. Considering such problems as noted, a sound attenuator is provided suitable for use in reducing noise produced by axial flow fans used in industrial environs such as mines and factories. The sound attenuator comprising concentric inner and outer tubular members (10, 12) having sound absorbing material (14) positioned therebetween. The inner tubular member comprises a lattice (20) of reinforcing strand material (22) coated with solidified resin (24) wherein the strand material is formed in opposed generally helical patterns to provide the lattice.