Abstract: A termite-proof bath trap barrier comprising a termite-proof screen with a pass-through hole therein which permits a conduit to pass therethrough. The conduit is secured in the pass-through hole in the screen with a termite-proof adhesive sealant which completely blocks passage of pests through the hole. The screen is secured to the top surface of the slab with a termite-proof adhesive sealant after the conduit is secured in its end-use position.

Abstract: Embodiments of the present disclosure provide for catalysts such as those shown in FIG. 1.1 and in the Examples, methods of making catalysts, methods of using catalysts, and the like.

Abstract: Method of manufacturing a large-scale shell construction, wherein a form is sprayed with a setting construction material, such as concrete. The method comprises rotating the form about a rotation axis while applying said construction material. Preferably it also comprises suspending the form from above in a point through which the rotation axis runs. Furthermore, the method can comprise floating the form on a body of water.

Abstract: A method for enabling a lining (14) to be applied to a pipe elbow or bend C comprises the steps of connecting a tie member (12) to an end of a flexible elongate mandrel (1), drawing the tie member through the elbow or bend so as to draw the mandrel therethrough and locate opposing ends of the mandrel adjacent to opposing respective ends of the elbow or bend, and securing the mandrel ends in relation to the respective ends of the elbow or bend. The mandrel can be adapted to the elbow or bend by locating the elbow or bend in a given orientation and deriving a profile S of the elbow or bend while in that orientation, removing the elbow or bend and then locating the mandrel in the given orientation, and adjusting the mandrel in relation to the profile of the elbow or bend to adapt it thereto.

Abstract: A valve in a mold as to provide a potential airflow pathway either way, the valving having at least a substantially closed condition from which it can be opened by a pressure differential in one direction that is below that which will cause it to open or fail to allow an airflow in the other direction.

Abstract: A fluid-filled soft prosthetic implant having a shell with a reinforced shell wall. The soft prosthetic implant may be for breast reconstruction or augmentation, or to restore the normal appearance of soft tissue in the buttocks, chin, calf, etc. The implants may be reinforced using several methods: reinforcement of the shell wall, non-homogeneous gel-filling, or both. At least a portion of the perimeter region desirably has a shell wall thickness greater than the average shell wall thickness of either the anterior face or the posterior face. The added material at the perimeter region strengthens that area in which a large percentage of implant ruptures occur. The reinforced perimeter also helps prevent the implant from collapsing or folding, which can cause undesirable rippling or wrinkling visible through the patient's skin. The remainder of the shell will desirably have a nominal wall thickness to retain the overall softness and supple feel of the implant.

Abstract: A method of manufacturing a syringe for use in enteral feeding includes providing a premolded syringe body having a plunger end and an outlet end, loading the premolded syringe body into a mold having a core pin extending into the outlet end of the premolded syringe body, closing the mold to thereby retain the premolded syringe therein and to close a mold cavity around the outlet end of the syringe body, injection molding by injecting plastic molding material into the mold cavity and cooling to thereby form a tip at the outlet end of the premolded syringe body, and opening the mold and extracting the syringe body and the tip.

Abstract: A device and a method for the production of multi-layer concrete pipes, particularly two-layer concrete pipes. The device has a first stand, in which a first pressing head that can be driven is mounted, a turntable, on which several mold mantles standing vertically can be pivoted into a stand in cycles, and a first charging system for filling a first concrete mixture into one of the mold mantles. A second pressing head having an outside diameter that is smaller than that of the first pressing head, and a second charging system for filling a second concrete mixture into one of the mold mantles are provided. In this manner, the second concrete mixture can be filled into the mold mantle, by the second charging system and the mixture can be distributed and compacted before the concrete pipe is removed from the mold mantle.

Abstract: An object of the present invention is to provide a process for producing a mixture of a two-liquid mixing type curable resin, which process is hard to generate curing unevenness, can be carried out with low energy consumption, and is suited for mixing even with a disposable static mixer. The present invention provides a process for producing a mixture of a two-liquid mixing type curable resin by mixing the constituents of the resin, wherein mixing operations of the constituents are performed multiple times and a non-mixing time is provided between at least one of the mixing operations and another one of the mixing operations subsequent thereto.

Abstract: A method of fabricating a double-walled shell of fiber reinforced plastic material is by centrifuging. The outer wall of the shell is made by projecting glass fibers and resin in a liquid phase against an inside face of a cylindrical mold rotating about its horizontal axis. A section member is then applied against the inside face of the outer wall by a plurality of turns having a diameter substantially equal to the inside diameter of the outer wall and separated from one another by a distance substantially equal to the thickness of the outer wall. The section member has a channel section with a web and two flanges extending radially outward, defining a sealed helical duct. The space between the turns is filled with resin by centrifuging, forming a helical spacer, and the inner wall is formed by centrifuging.

Abstract: A method and an apparatus for use in installing a liner in a conduit as part of a repair procedure, the apparatus including a sealing inlet port (106) for passage of the tubular liner (72) into an enclosed container (52) where an increased pressure is maintained to move the tubular liner into the conduit (179) and to evert it as it moves along the conduit A clamp (80) holds one end of the liner to the outlet side of an everter box (50) supported on a frame (18) that may be mounted on a trailer hitch receptable. The sealing inlet port includes a pair of lips (112, 114) to press against the opposite sides of a flattened liner. Support members (148, 150) keep the lips from being forced back out toward the outside of the pressurized everter box and control friction between the lips and the liner. Inlet and outlet fittings are provided. The apparatus is portable on a trailer hitch receiver.

Abstract: A method for making a liquid storage tank for holding chemicals and heating oil and water and liquids compatible with high-density polyethylene. The tank is lap welded with a perforation in the lap weld and contains a molded polyethylene lining inside the tank.

Abstract: A process and apparatus for forming a seal between a filter cartridge wall and a pleated filter disposed within the cartridge having a support for rotating the cartridge. A nozzle is connected to a source of sealant for injecting sealant into an area between the wall of the cartridge and the filter media. A valve connected to the nozzle valves sealant to the nozzle and has a draw back feature after a desired amount of sealant is injected. The method for sealing the filter media to the wall of the cartridge includes rotating the filter cartridge while disposing a nozzle into the interior of the cartridge and injecting a sealant through the nozzle controlled by a valve. The valve draws flow backwardly from the nozzle at the termination of the injection of sealant.

Abstract: Laminae suitable for use in a mold suitable for use in forming retroreflective sheeting and methods of making such laminae are disclosed. A representative lamina includes a single row of geometric structures disposed on the working surface. Each geometric structure includes three faces arranged as a cube corner element and at least one additional face. A set of parallel grooves is included, each groove having one of the three faces of one geometric structure and the at least one additional face of an adjacent geometric structure as groove side surfaces.

Abstract: A novel integral cardiotomy/venous blood reservoir, blood oxygenator and heat exchanging device, method of making a blood oxygenating and heat exchanging device and an extracorporeal circulatory support circuit. The reservoir includes a novel blood defoaming and filtering chamber closely receiving filtering and defoaming media. The blood oxygenating and heat exchanging device includes thermal formed housing portions, and a heat exchanging barrier, blood oxygenating medium and/or filtering medium, which are sealed by potting compound at one time. The oxygenating medium comprises a hollow fiber type medium, with its ends left open to be sealingly mounted in a gas path by a novel mounting bracket.

Abstract: Cast iron pipe and other elongated hollow articles are lined with a cementitious mortar for certain applications, such as the transmission of potable water or sewage. To improve the resistance to attack from acids and to provide a crack and void spot free cement lining, a calcium alumina cement is used to line the article. A plasticizer such as fireclay is added to the calcium alumina cement prior to its application. The cement lined article is then coated with an asphaltic based coating and then cured in a high humidity environment.

Abstract: A method is shown for forming a flange on an end of a plastic pipe liner of the type used to line a tubular member. A preformed synthetic disc is installed on the end of the synthetic liner which extends from the tubular member. The exposed end of synthetic liner is surrounded with a forming unit which includes a heating unit and an associated forming mandrel. The heating unit is extended to heat the junction between the preformed disc and exposed end of the liner to form a weld area between the two. The forming mandrel is then extended to compress the molten weld area between the liner and disc. The remaining exposed material is removed to form a finished surface coplanar with the face of the synthetic disc.

Abstract: A concrete article having a mixture layer comprising concrete and a polysulfide-modified epoxy resin as an intermediate layer between a concrete body and a cured layer of a polysulfide-modified epoxy resin, which concrete article is excellent in corrosion resistance, durability and workability, and shows good adhesion to the concrete body and to the cured layer of the polysulfide-modified epoxy resin. This concrete article can be produced by applying a coating composition containing the polysulfide-modified epoxy resin to the concrete body in an uncured state.

Abstract: A lid for sealing a container. The lid adheres to the container by a vacuum formed within the container. The lid is formed of a substantially circular panel having a flanged perimeter and a concave depression on an upper side of the circular panel. A pressure release hole extends through the concave depression of the circular panel and sanitary coating is disposed on a lower side of the circular panel. A first adhesive material is applied to the lower side of the lid by fusion to the sanitary coating to form a thin film over the release hole, and a second adhesive material is disposed in the concave depression on the upper side of the lid to form a removable seal. The second adhesive material has the same properties as the first adhesive material.

Abstract: A rotationally symmetrical molded part of a high-temperature superconductor achieves a critical current density of j.sub.c .gtoreq.800 A/cm.sup.2 at a temperature of 77K, by using a powder mixture (8) having the stoichiometric composition of Bi.sub.2+x EA.sub.3 Cu.sub.2 O.sub.y, where -0.15<x<0.4; EA=an alkaline earth metal or a mixture of alkaline earth metals, in particular a mixture of Sr and Ca in the ratio of Sr:Ca=(2+z):(1-z), where 0<x<0.2; 8.ltoreq.y.ltoreq.8.3. With the aid of a conveying chute (9), the powder mixture (8) is brought uniformly at room temperature with a grain size of <50 .mu.m into a silver mold (5) which is arranged inside a rotating fusion mold (4), open at one side, in a furnace (3). Subsequently, the fusion mold (4) is accelerated, heated to 500.degree. C. and held for approximately 30 min at 500.degree. C. After subsequent partial melting at a temperature of T.sub.m K to T.sub.m +6K, where T.sub.

Abstract: A repair device for the in situ repair of a pipe comprises an assembly of at least four short cylindrical, inflatable members 1, 2, 3, 4, which are interconnected by articulated rods 5 which are each articulated by means of a cardan joint 6. When in the pipe, the inflatable members define a cavity 10 for receiving a filler material 7'. Ducts 8 are provided for individually connecting the inflatable members to a source of compressed inflating fluid, and a duct 22 is provided for conveying the filler material to the cavity 10. The outermost inflatable members are provided with attachments for securing a cable or chain 9 thereto. This construction permits the complete and continuous repair of the pipe during advancement of the assembly of inflatable members, even in the region of shoulders 12, internal projections 13, connections with lateral pipelines 14, or bends 12', while ensuring that the injection chamber 10 remains filled with filler material 7'.

Abstract: A method of manufacturing an inner lined pipe in which a lining layer is formed to the inner circumferential surface of a pipe using a centrifugal molding method, wherein a resin mortar material and a hardening agent for lining are mixed at the top end of an arm member of a supply device and discharged, thereby enabling to select a lining material of a short pot life to attain efficient production, as well as eliminate wasteful consumption of the lining material.

Abstract: A method for producing a container having an inside bag for the accommodation of a filling material w which is applied by a propellant between the container and the inside bag from a valve or the like, wherein after production of the container, for example by pressing, deep drawing or the like, its interior is provided with an inside protective lacquer and subsequently primed. Thereupon, plastic for the inside bag is injected into the container and the container having the inside bag is subsequently subjected to heat to remove superfluous solvent from the plastic. Then a bottom hole is shaped out for the later introduction of the propellant. After injection of the plastic, the container is placed in an oven and rotated therein for a lengthy period.

Abstract: A molded part formed by outsert-molding a resin into a through hole of a pipe part includes a pipe part and a resin part. The pipe part includes a hole having a tapered surface whose size is gradually reduced inward from an end portion of a through hole formed in an outsert-molded part such as a metal part, and a resin part has an outer shape matching the tapered surface. The resin part is formed in the pipe part by outsert molding.

Abstract: A centrifugal molding method which can smooth the inner surface of the resin concrete layer of a resin concrete pipe or of a composite pipe having a resin concrete layer even without using any special sand conditioning mechanism and which is high in productivity includes producing a composite pipe having a resin concrete layer or producing a resin concrete pipe by moving an arm member of a pipe material feeding device forward and backward axially through a pipe forming outer mold rotating about an axis thereof and by feeding pipe materials from a discharge port formed in a front end of the arm member. The resin concrete layer is formed by feeding resin and aggregate to a mixing portion provided at the front end of the arm member through separate feed routes, mixing the two in the mixing portion and discharging the resulting mixed resin concrete material from the discharge port.

Abstract: A method for fabricating in a mold a rotatable recording drum. Initially, the mold is rotated and a predetermined quantity of a flowable substance is poured into the mold cavity and is centrifugally flung against the mold wall to form a mold layer with a smooth inner surface. Next, a surface substance is poured into the mold cavity and is allowed to harden against the mold layer. A core outer layer substance is then poured into the mold cavity and allowed to harden against the surface substance, and rotation of the mold is stopped. The mold layer fluid is removed, and the cavity inside the outer layer is filled with a core inner layer substance which is allowed to harden before the drum core is removed from the mold cavity. Following removal of the core from the mold cavity, the hardened surface substance may be vacuum coated, and a protective overcoat applied to the core. The drum core and the surface substance can also be formed separately.

Abstract: The components forming the layers of a composite pipe are successively introduced into a rotary drum (1). Initially, a plastic reinforcing lyaer (8), including a fiber reinforcement, is introduced into the drum, the ends of the drum (1) being bounded by rings. A concrete core layer (16) is then introduced and the length of the core layer (16) is shortened relative to that of the drum (1) by shaping rings fixed to the drum ends. The shaping rings are then replaced by other shaping rings (20, 21) so that, on either side of the core layer (16), two annular spaces (22, 23) are formed which are filled by a socket material (24, 25) of the same composite as the reinforcing layer (8). Thus, at one pipe end a socket end (28) is formed and at the other pipe end a spigot end (30) is formed, each such end being located within the composite pipe wall thickness. After introducing a second reinforcing layer (26), the production of the composite pipe is completed.

Abstract: A casting containing toxic waste is made by centrifugally casting toxic waste in a pre-formed cage having heat conducting means therein. The casting is formed with suitable shielding materials selected as a function of the waste being cast. The finished casting contains passageways through which heat is removed. These passageways are oriented such that when two or more castings are stacked in abutment, the passageways of adjacent castings interconnect.

Abstract: Iron pipe and other hollow articles are lined with a cementitious mortar containing a quantity of polymer particles and the pipe is rotated about its axis so as to stratify the mortar and develop a polymer rich inner surface that is subsequently cured, dried and heated to the polymer fusion temperature and then coated with a continuous layer of pure polymer.

Abstract: A computer controlled concrete injector pump and process for lining pipe comprises a pump chamber having an outlet connected to a spray lance through a first check valve and having first and second inlets, one inlet being connected through a second check valve to a hopper, and the second inlet being connected to an injector tube having a piston moveable therein by a hydraulic cylinder. The hydraulic cylinder is controlled by a programmable logic controller in a control system which has provisions for operator input of lining process parameters. The volume and flow rate of material from the pump may be controlled accurately by controlling the movement of the piston within the injector tube. The valve housing of the second check valve between the chamber and the hopper is split into two portions which are connected by a quick-disconnect coupling. The valve housing may be separated for access to its interior for maintenance and cleaning.

Abstract: The wall of the pipe section comprises a plurality of superimposed layers, which are formed from plastic and inorganic materials. The layer of inorganic materials forms the central layer, whose wall portions are in each case connected by a connecting layer to a reinforcing layer. While the central layer ensures the dimensional rigidity of the pipe section, the two reinforcing layers, which are made from a fiber-reinforced plastic, ensure the strength of the pipe. This combination of different layers is an inexpensive solution, which only requires that amount of expensive plastic as is required for the strength of the pipe. Through applying a plastic protective layer to the outer circumference of the pipe and a protective layer to the inner circumference of the pipe, the durability of the pipe section is ensured.

Abstract: A method for lining pipe lines for transporting city water, city gas, petroleum and other various kinds of fluids.In a method used as a conventional art, i.e.

Abstract: A method of lining a pipe comprises the steps of laying hose means along the bottom of a pipe to be lined, the hose means having been filled with a predetermined quantity of settable lining composition, anchoring the hose means at each end along the bottom of the pipe, advancing a centrifugal lining machine along the length of the hose means, slitting the hose means in front of the advancing centrifugal lining machine to permit egress of the lining composition from the hose means, and delivering the admixed settable composition to a centrifugal impellor of the centrifugal lining machine for application of the settable composition to the pipe wall as the centrifugal lining machine advances along the pipe. The method is characterised by the step of guiding the slit and emptied hose means through an axial bore in the centrifugal lining machine to lie in a flattened condition on the bottom of the lined pipe wall rearwardly of the centrifugal lining machine.

Abstract: Low-level radioactive wastes and the like are identified by composition and segregated based on specific contaminants identified. The separated wastes are subsequently encapsulated in a centrifugal process prior to disposal. The wastes advantageously are subjected to heat prior to classification in order to remove any volatiles and hydrocarbons present.

Abstract: A method of applying a protective coating to the inner surface of a pipeline includes the steps of adhering a porous flexible hose to the pipeline inner surface, an end of the hose of which is turned inside out and attached to the pipeline. The hose is moved inside the pipeline by progressively turning it inside out and pressing it to the inner surface of the pipeline by providing an excess pressure in a cavity formed by the portion of the hose turned inside out, and producing a counter-pressure before the hose as the same travels lengthwise of the pipeline. The magnitude of the counter-pressure is maintained at a predetermined level in the course of the hose travel. A piston having a passage for the hose is placed in the cavity formed by the portion of the hose turned inside out, and a binder is placed between the piston and the portion of the hose turned inside out. The binder soaks through the pores of the hose to facilitate the formation of a bond between the hose and the inner surface of the pipeline.

Abstract: A method of lining a passageway comprising pulling a first flexible lining pipe sized to the passageway to be lined into the passageway, the first lining tube comprising at least one resin absorbent layer impregnated with curable synthetic resin, and by the eversion into the first lining tube of a second flexible lining tube sized to the first tube inner diameter, to the inner surface of which a second lining tube before eversion is applied an initiator for the resin impregnating the first lining tube whereby, as the second lining tube everts into and along the first tube when in the passageway, the first tube is pressed against the passageway surface by fluid pressure used to evert the second tube, and also the initiator comes into contact with the resin of the first tube and commences and effects cure of the same.

Abstract: A method of lining pipes by providing a predetermined distance of pipeline with a first and second end; forming at least one closure point in the pipeline by cutting at least one section of the pipeline forming at least a first and second section of the pipeline and at least one cutout section of pipeline; pushing or pulling a first liner segment through the first section of pipeline to the closure point; pushing or pulling the second liner segment through the second section of the pipeline through to the closure point; contacting the two liner segments together at the closure point; fusing the two liner segments together at the closure point; insulating the exposed liner surface at the closure point; and welding the cut out section of pipeline to the first and second sections of pipeline.

Abstract: A method and apparatus for manufacturing a centrifugally cast pipe for use in a chemical and corrosive atmosphere is provided. The centrifugally cast pipe has an integrally cast socket or coupling at one end of the pipe. The socket is cast onto the pipe. At the same time that the pipe is cast, both socket and pipe are cured simultaneously, creating a homogeneous wall from body to socket through the transition zone.

Abstract: The invention provides for the light curing of a synthetic resin which is light curable, and is arranged as a layer upon the surface of a pipeline or passageway. The curing lamps are enabled to be pulled into the pipeline or passageway by virtue of inserting a tubular member into the passageway which is inflatable by fluid pressure so as to hold the resin layer in position. The lamps pass through the inflatable tubular member so that radiation therefrom will fall on the layer of resin and cure or initiate the cure of the same.

Abstract: A method and apparatus for spin casting a castable material into a cylindrical body. The method comprises the steps of rotating an elongated cylindrical body about its longitudinal axis, applying an extrudable uncured material as a continuous stream in helical fashion from one point in the body to another point, continuing to rotate the body until the material is leveled and at least partially curing the material while continuing to rotate the body. The apparatus comprises means for holding and spinning an elongated cylindrical body, and extruder means for providing a continuous stream of an extrudable uncured material in a desired fashion along the inside of the cylindrical body.

Abstract: In the method for manufacturing annular portions of magnetic heads, a gap between the confronting end surfaces of the magnetic heads is filled with glass. In one of the conventional processes, the glass is sucked into the gap by a capillary action of the gap, but bubbles are liable to form in the glass. The method according to the present invention comprises a step of heating the glass to a relatively low temperature capable of causing the glass to be flowable and applying a centrifugal force to the glass being heated in a rotatable support of a heating furnace. As a result of the centrifugal force, the tendency to form bubbles is considerably reduced as compared with the conventional methods.

Abstract: A reinforced bitumen pipe has an inner, strength-providing, reinforced thermosetting resin layer which is coated on its inner and outer sides with a bitumen layer. The bitumen layer on the inner side, and preferably also the bitumen layer on the outer side, is separated from the strength-providing reinforced thermosetting resin layer with the aid of an insulating glass fiber layer into which the thermosetting resin and the bitumen partially penetrate without finding their way up to each other.

Abstract: A process of molding a concrete pipe is proposed. The attainment of a predetermined degree of compactedness of fresh concrete is electrically detected through a pressing roller by which the fresh concrete is compacted in a molding flask. When a predetermined degree of compactedness of concrete is attained in one place within the molding flask, a belt conveyor for feeding the molding flask with fresh concrete is automatically moved to the next place.

Abstract: A method for coating the interior of a cylindrical surface comprising depositing on the interior or a rotating cylindrical surface a dry hydraulic cement composition and applying to the dry cement coating which is held stationary on the interior cylindrical surface by the centrifugal force of the rotating cylinder an aqueous composition and allowing the cement to harden to provide a coating having no tendency to slump or sag in the wet condition.

Abstract: A pipe lining apparatus includes a distributor head which throws cement mortar centrifugally against the interior of a pipe, a trowel which smooths the cement mortar and a liquid coating spray applicator which applies a curing control substance to the trowelled lining. The spray applicator comprises an air atomizing device which produces a very fine coating spray and blows it onto the freshly applied mortar lining without disturbing the lining. Also, in one embodiment the coating spray application is mounted to swing laterally with the trowel so as to be maintained centrally in the pipe.

Abstract: A method for the production of two-layer pipe casting is carried out in the following manner. First, a reaction chamber is filled with an initial mixture. Then, the reaction chamber with the initial mixture is set in rotation about its longitudinal axis whereupon the centrifugal acceleration of the reaction chamber is brought up to about 300 to about 1000 g. The initial mixture is then inflamed and centrifugal acceleration is gradually brought down to about 50 to about 100 g for a time period sufficient to enable combustion of the initial mixture as well as subsequent separation of the resultant melt into two layers, external and internal, until their solidification. The separation of the melt composed of the final products of combustion into two layers takes place under the action of centrifugal forces due to the difference in specific weights of said layers.

Abstract: A centrifuge rotor which is laminated and consists of at least two layers of different materials, a mechanically stronger layer being outermost and a chemically more resistant layer being positioned as an inner filler material. A method of forming a centrifuge rotor laminated and consisting of at least two layers of different materials is also disclosed.

Abstract: A process for the production of a refractory lining within a tubular vessel which comprises disposing said tubular vessel so that the longitudinal axis running therethrough is horizontal, slinging a moist refractory mass onto a longitudinal or annular section of the interior wall of the tubular vessel and thereafter applying moist refractory mass to additional longitudinal or annular sections as the case may be. The process can be conducted either by rotating the vessel so as to expose successive annular sections and applying refractory mass to said sections from a fixed position or it can be performed by moving the source of refractory mass longitudinally to cover longitudinal sections and rotating the vessel only partially so as to bring the stream of refractory mass against a second longitudinal section. Devices to carry out these processes are disclosed including a slinger machine disposed for longitudinal movement within the vessel and means for rotating the vessel to the desired extent.

Abstract: A method of lining a pipe with settable material including the steps of arranging the pipe with its longitudinal axis inclined at an angle to the horizontal, introducing a selected amount of liquid material into the pipe at a predetermined rate so that the liquid material flows down along the pipe, shifting the pipe to a horizontal position and spinning the pipe about its axis to distribute the material, spinning continuing until the material has set. The method is particularly applicable for lining pipes with polyurethane. For pipes with end flanges end faces of the lining material can be formed integral with the lining.

Abstract: A method of lining a pipe with thermosetting synthetic plastics material including the steps of arranging the pipe with its longitudinal axis inclined at an acute angle to the horizontal, introducing liquid lining material into the pipe at a predetermined rate for a predetermined time, shifting the pipe to a horizontal position shortly before or at the completion of introduction of the liquid material, spinning the pipe about its axis and blowing hot air axially through the pipe after spinning has started but before the lining material has set thereby to remove entrained air bubbles. The method is particularly applicable for lining pipes with polyurethane, especially pipes with end flanges and covers to form an end face of the lining material.