39 results about "Cured-in-place pipe" patented technology

A reinforced liner for cured in place pipe rehabilitation of an existing pipeline having a plurality of high-strength low-elongation fiber bundles disposed circumferentially around the tubular liner at both inner and outer surfaces of a resin absorbent layer of the liner is provided. The bundles of reinforcing fibers are continuous lengths of high modulus fibers laid circumferentially with the ability to stretch to accommodate variations in host pipe diameter. The ends of reinforcing fibers on the inner and outer reinforcing layers overlap so that the ends slide past each other as the liner is expanded prior to cure. The reinforcing fibers may be secured to a porous scrim to form an inner tubular reinforcing layer. An outer layer of bundles of reinforcing fiber are formed into a tube about the absorbent layer. An outer impermeable tubular layer is wrapped around the inner layers. The reinforcing layer may include longitudinal reinforcing fiber in either or both reinforcing layers to increase the longitudinal strength of the liner.

A reinforced liner for cured in place pipe rehabilitation of an existing pipeline having a plurality of high-strength low-elongation fiber bundles disposed circumferentially around the tubular liner at both inner and outer surfaces of a resin absorbent layer of the liner is provided. The bundles of reinforcing fibers are continuous lengths of high modulus fibers laid circumferentially with the ability to stretch to accommodate variations in host pipe diameter. The fibers on the inner surface are secured to a porous scrim to form an inner tubular reinforcing layer. A resin absorbent layer is formed into a tube about the inner layer. An outer layer of bundles of reinforcing fiber are formed into a tube about the absorbent layer. An outer impermeable tubular layer is wrapped around the inner layers. The reinforcing layer may include longitudinal reinforcing fiber in either or both reinforcing layers to increase the longitudinal strength of the liner.

A liner for repairing damaged pipes, such as underground sewer or gas pipes is disclosed. The liner comprises a TPU coating on a fibrous mat of non-woven fabric. The TPU coating is a high heat resistance polyester TPU which allows an epoxy resin / amine to be saturated in the non-woven fabric and the cure initiated by the use of steam or hot water. The cured epoxy resin converts the liner from a flexible state to a rigid state as the liner is cured in place inside the pipe. The TPU containing liner may also be used with thermoset resins other than epoxy resins, such as polyester resins and vinyl ester resins.

A fiber reinforced non-stick plastic bladder is provided. The bladder preferably includes a bladder body formed of a fiber reinforcing material layer with a coating on the bladder body made of a thermoplastic. The coating preferably has elastomeric properties and is semi-transparent. Methods of lining pipe using the new bladder are also provided.

A composite fabric includes: a fabric backing; an adhesive layer; a midlayer barrier bonded to the fabric backing by the adhesive layer; and an external barrier bonded to the midlayer barrier, wherein the composite fabric has a hydrostatic pressure resistance of at least 100 psi and is sufficiently flexible such that it can be formed into a tube and everted. A process and an apparatus for producing the composite fabric are also disclosed. The composite fabric is particularly suitable for use as a liner in a cured-in-place pipe repair method.

A method of inserting a cured in-place pipe from a cleanout includes positioning a lining along a portion of a length of a bladder, wherein the lining is frangibly connected to the bladder, inserting the bladder through the cleanout, to a position wherein the lining is within the pipe and does not block the pipe.

The present invention relates to methods and apparatus utilizing distributed temperature sensing (DTS) to monitor the temperature of a cured-in-place pipe liner to determine if proper curing temperatures and times are achieved. More particularly, an optical fiber is placed between the pipe and the liner running the entire length of the liner. The optical fiber is coupled to a DTS unit. During curing of the liner, the DTS unit sends light pulses down the fiber from one end and detects the characteristics and time delay of light backscattered to the unit. The characteristics are indicative of the temperature of the optical fiber, while the delay is indicative of the round trip time of the light within the fiber, and thus the distance from the DTS unit from which any particular backscatter signal originated.

A curing system for Cured-In-Place-Pipe includes a generator, low pressure high volume blower, heater, upstream sensor and control system housed within a vehicle for mobilization from job site to job site. In use a technician inserts CIPP into a pipe requiring repair, and inputs project specifications such as diameter of CIPP, thickness of CIPP and length of host pipe into the curing system's control system. The technician connects the curing system to the upstream end of the CIPP and initiates the curing process, including the steps of evacuation of ambient air from lining system; pressurizing lining system; superheating lining system; evacuation of superheated air; and relieving pressure after liner has cooled down. During the process, an upstream sensor and a downstream sensor measure parameters such as pressure and temperature and send this data to a control system. The control system includes algorithms that guide the process by adjusting specific parameters such as flow rate, temperature, exhaust rate, and duration, based on upstream and downstream sensor data and differentials there between.

An apparatus and method of making a cured-in-place pipe repair to a lateral pipe having an area in need of repair. The method and apparatus use a liner assembly comprising a bladder tube and a liner tube. The liner tube comprises at least one layer of non-stretching material, which includes strands of non-stretching material oriented in the longitudinal direction of the liner tube. The strands allow radial stretching but ensure that the liner tube does not stretch longitudinally, which prevents the liner tube from stretching into a main pipe or past the area in need of repair during use. The liner tube may also comprise second and third layers of a resin impregnable material, such as felt, which surround the layer of non-stretching material such that the liner tube may be impregnated with a resinous material to repair a pipe having an area in need of repair.

The use of nitroxides to control free radical cured resin systems used in the production of thermosetting materials such as in vacuum infusion, resin transfer molding and cured in place piping systems is disclosed. The invention could also be employed in other resin systems where control of kinetics would be desirable such as in adhesive formulations, in solid surface composites, and certain types of polyester casting resins.

The embodiment of the invention relates to the field of pipeline repair, and discloses a cured-in-place pipe (CIPP) liner pipe and a method for preparing the CIPP liner pipe. The CIPP liner pipe comprises a fabric layer, a thin film layer and a rubber layer made of rubber which is expandable when meeting water. The fabric layer is in a pipe shape; the thin film layer surrounds the inner surface ofthe fabric layer to form the inner wall of the CIPP liner pipe; and the rubber layer is arranged on the outer surface of the fabric layer. According to the embodiment of the invention, relative to the prior art, the rubber layer made of the rubber which is expandable when meeting the water is arranged on the outer surface (that is, the surface facing the inner wall of a damaged pipeline) of the CIPP liner pipe, when a gap is formed between the CIPP liner pipe and an original pipeline, the intrusive water (that is, groundwater or pipeline sewage entering the gap) can cause spontaneous rapid expansion of the rubber, thus the gap is fully filled with the rubber, and a sealed isolation layer is formed, so that the CIPP liner pipe and the original pipeline are closely attached together, and mutual infiltration of the groundwater and the pipeline sewage is effectively prevented accordingly.

A combination of a styrene reduction agent and a catalyst that effectively and economically reduces styrene emissions in Cured-In-Place Pipe, closed molding processes. The reduction agent generally comprises a calibrated mixture of salts including sodium chloride plus three persulfate salts: ammonium (APS), potassium (KPS), and sodium (NPS). These ingredients are combined in powder form and are compressed into soluble capsules containing calibrated amounts of the mixture. The capsule(s) may be prescribed through the use of software. The catalyst is hydrogen peroxide (H2O2). A calibrated amount of the styrene reduction agent capsule(s) are added to the cure water prior to starting the boiler equipment for the Cured-In-Place Pipe process, and this is followed by a calibrated amount of the H2O2 catalyst in order to reduce the residual monomer content in either process or waste streams.

A styrene reduction agent that effectively and economically reduces styrene emissions in Cured-In-Place Pipe, closed molding processes. The reduction agent generally comprises a calibrated mixture of salts including sodium chloride plus three persulfate salts: ammonium (APS), potassium (KPS), and sodium (NPS). These ingredients are combined in powder form and are compressed into soluble capsules containing calibrated amounts of the mixture. The capsule(s) may be prescribed through the use of software. Capsule(s) are added to the cure water prior to starting the boiler equipment for the Cured-In-Place Pipe process in order to reduce the residual monomer content in either process or waste streams.

An assembly and method of sealing a junction of a pipe and a second structure are provided. The assembly includes a pipe liner having a tubular portion and a brim portion, and a mechanical anchor adapted to secure the brim portion of the pipe liner to the second structure. The assembly may further include a compression gasket for placement between the pipe liner and the pipe or second structure. The compression gasket may comprise a hydrophilic material, a hydrophobic material, or a compressible material. The methods of using the assembly include, but are not limited to, the use of a cured-in-place pipe liner.

The invention relates to the technical field of pipeline engineering, and discloses a CIPP (cured in place pipe) for repairing a trenchless underground pipe network, and a preparation method and application of the CIPP. The CIPP for repairing the trenchless underground pipe network disclosed by the invention comprises a tubular fiber fabric, resin and a curing agent or a reactive diluent, whereinthe resin, the curing agent and the reactive diluent or the reactive diluent fill the fiber fabric; and the CIPP also comprises ultra-high-molecular-weight polyethylene, wherein the ultra-high-molecular-weight polyethylene is ultra-high-molecular-weight polyethylene particles or ultra-high-molecular-weight polyethylene fibers. The ultra-high-molecular-weight polyethylene has high impact strength,high wear resistance and low friction coefficient, so that the ultra-high-molecular-weight polyethylene is adopted as a single filler, then the CIPP can meet various repair performance requirements such as wear resistance, corrosion resistance, impact resistance, self-lubrication and the like, and meanwhile, the effects of simplifying formula, facilitating stirring and saving construction time areachieved. The ultra-high-molecular-weight polyethylene is safe and nontoxic, so that the CIPP provided by the invention can be used for repairing underground pipelines, and can also be used for repairing drinking water pipelines.