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

A process for lining an existing pipeline or conduit with a flexible resin impregnated cured in place liner by pulling in the liner and inflating an eversion bladder with air and curing the liner with flow-through steam without loss of pressure is provided. The bladder is stored in a pressure bladder canister coupled to a pressurized downtube and eversion elbow. The bladder is everted by introducing pressurized air into the canister As the bladder reaches the distal manhole, it enters a receiving canister where it is punctured while maintaining air pressure within the bladder a pinch valve between the downtube and elbow isolates the inverted bladder so that steam can be introduced into the bladder to cure the resin and exhaust through the receiving canister. The bladder is then removed and lateral service reinstated.

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.

The present invention relates to method 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 in the pipe between the original pipe and the liner running the entire length of the liner. The optical fiber is coupled to a DTS unit at neo end. 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 of the backscattered light is indicative of the temperature of the optical fiber, while the time delay between the sending of the light pulse and the detection of any portion of the backscatter signal is indicative of the round trip time of the light within the fiber, and thus the distance down the fiber from the DTS unit from which that particular backscatter signal originated.

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.

A method 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 in the pipe between the original pipe and the liner running the entire length of the liner. The optical fiber is coupled to a DTS unit at one end. During curing, the DTS unit sends light pulses down the fiber and detects the characteristics and time delay of light backscattered to the unit. The characteristics of the backscattered light is indicative of the temperature of the fiber while the round trip time delay is indicative of the distance down the fiber from the DTS unit from which that particular backscatter signal originated.

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, a compression plate, and a mechanical anchor adapted to secure the compression plate and brim portion of the pipe liner to the second structure. The assembly may further include a gasket for placement between the pipe liner and the pipe or second structure. The 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.

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 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 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.

Method and apparatus for forming a grommet assembly to seal and reinforce holes through a cured in place liner for securing a cable. A first grommet base having a centrally located aperture with wedge shaped grooves is positioned on one side of the hole. A barrel having two opposed sets of wedge shaped projections is inserted into the grommet base and a second grommet base is placed on the barrel and pushed towards the liner until the second base firmly contacts the top surface of the liner and compresses the liner against the first base. The wedge shaped projections on the barrel and the complimentary grooves in the central apertures of the grommet bases prevent the barrel from being pulled out of either grommet base. The end of the barrel which projects out above the second base is cut off flush with the top surface. A hydraulic press to install the grommet assembly is also disclosed.

A Cured In Place Pipe System includes a tubular substrate constructed of needle-punched fibers of carbon, aramid and thermoplastic. The tubular structure defines a longitudinal channel running along the length. Within the channel is an air bladder, preferably including an air duct. The tubular substrate is enclosed within a loose-fitting protective film. The tube is preferably constructed with multiple overlapping layers that aren't permanently bound, thereby allowing for circumferential expansion to accommodate various host pipe sizes, shapes, and configurations. The integrated thermoplastic has a melt/flow point of approximately 300-342° F., a cure point of approximately 330-370° F., and bonding point of approximately 372-412° F. at approximately 5-20 psi.

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 thickening agent for thickening polyester resin used in Cured-In-Place-Pipe open-molding processes. The thickening generally comprises a calibrated mixture of neutral polyester resin carrier with an active agent comprising approximately 98.5% Magnesium Oxide (MgO) paste and 1.5% anhydrous Calcium Chloride. The Calcium Chloride is powdered and combined in powder form with the MgO paste and binder for addition to the polyester resin prior to curing for the Cured-In-Place process.

A filtration system is used with a pipe repair system, such as a cured-in-place pipe lining system. Before, during, and/or after the repair of the pipe with the pipe lining system, air from inside the pipe is directed into a filtration system. The filtration system removes contaminants, such as VOCs and other harmful gases, particles, and the like, with a filter, and then the filtered air is exhausted from the system. The filter can be a carbon filter or other filter that can remove harmful or hazardous materials and particles from the air prior to exhaust. The air is also sensed to acquire information, such as temperature, pressure, composition, flow, or the like.

A fitting including a tubular extension, flange with apertures, and interface there between is fused with surrounding cured in place pipe and subsequently connected with an adjoining fitting, to connect two segments of pipe in a pipeline. The tubular extension is sized and shaped to mate with the host pipe with which it is associated, and the flange is sized, shaped, and has an aperture pattern that corresponds with the fitting to which it will be attached.