Method to repair pipeline, complex of equipment for realisation of method and its devices
FIELD: machine building.
SUBSTANCE: method to repair pipes dismantled in process of pipeline repair and accepted suitable for repeated use, is carried out on a route under basic conditions using a complex of equipment for repair of pipes, in connected mobile modules of which pipes are cleaned from old insulation, the external surface of the pipes is prepared for application of a coating, the external surface of the pipes is insulated by application of a protective coating, while heating the external surface of pipes to speed up the process of protective coating polymerisation. Pipes are moved to the place of storage, at the same time works are carried out in a general flow, for this purpose each pipe is based on two trolleys. Depending on the nature of technological operations, each pipe is given a rotary movement using reciprocal motion of trolleys along a rail track, besides, ends of pipes at the length of at least 150 mm are protected against application of a coating.
EFFECT: method expands the arsenal of technical facilities, increases efficiency of a process for coating application under route conditions onto pipes, also of large diametres due to automation and synchronisation of efficiency of processes for preparation of external pipe surfaces and application of an insulating coating onto them.
The invention relates to the construction of pipeline transport and is used in the repair of pipelines, as well as the repair of pipelines for different purposes.
According to the "Provisional instructions for the re-use of pipes in the overhaul of the linear parts of main gas pipelines", Gazprom, 2005, allowed the re-use of pipes, removed from the main gas pipelines with removing them from the trench and repaired. The tubes re-use must be isolated in accordance with the requirements of normative documents on corrosion protection of pipes for the overhaul of the linear parts of main gas pipelines.
It is known that the cleaning of pipes mechanically with the help of machines high performance at low cost. Production of insulation works on trubozagotovitelny bases in the presence of the pipeline is more favorable conditions than on the track. In addition, it is known that if between the cleaning pipe and coating on its surface an insulating coating is formed a gap in time in a few hours, then have to re-clean the surface of the pipe, because during this time, especially if precipitated rain, fog, dew or snow on the pipe there is a RAID RJ is whiny, preventing case the adhesion of the insulation material with the pipe body. Thus, there is a problem in the field of integrated automation of process pipe insulation from training their surface before applying the coating, and the problem of increasing the reliability of the outer protective coating of the pipeline by improving the protective properties of the coating of the pipe, eliminating development sub pellicle and stress-corrosion on the pipeline in a period of time comparable to the lifetime of the pipeline.
The prior art line PTL-2 (Catalog machines for the construction of pipelines, ed. 7, revised and expanded. M: "NEDRA", 1984, section 6, p.120), designed to remove the round metal brushes dirt, rust and loose scale from the outer surfaces of steel pipes and application of bitumen-rubber protective coatings or protective coatings from polymeric adhesive tapes. The disadvantages of line, you must include the fact that it is used in the basic conditions and cannot be applied coatings, as well as impossible qualitative preparation of the pipe surface under the paint application due to the lack of necessary mechanisms.
The known method of repairing the pipeline, which is implemented in the mobile insulating base 100-500, before aznacenni for pipe and pipe sections ("dubtronic") mastic, tape and combined materials.
The base is designed on a modular basis and consists of the drive uninsulated pipes, conveyor module drying tubes from moisture and ice, module, pipe cleaning, module, application smolney primer, module insulated coating and the drive insulated pipe (http://www.izolperm.ru/trubi/mid100500.html). The known solution is the closest to the claimed group of inventions.
The disadvantages of the known solutions need to be considered limited scope due to the lack of equipment for surface preparation of the pipe for applying coatings, as well as lack of equipment for applying such coatings.
The objective of the invention is to expand the Arsenal of technical means, i.e. the creation equipment to perform field method, containing operations prepare pipe surface under the paint application, and the application of paint on the outer surface of the pipe in the repair of pipelines.
Achievable technical result when implementing the claimed group of inventions is the creation equipment to perform field method, containing operations prepare pipe surface under the paint application, paint etc is s on the outer surface of the pipe in the repair of pipelines, as well as getting in route conditions of the coating with desired corrosion resistance and dielectric properties, high gasoline, atmosferoustojchivosti, abrasion resistance;
increase service life coverage is comparable to the lifetime of the new pipeline, improving the performance of the coating process in route conditions on the pipe, including large diameter (1200 mm and more) through automation and synchronization on the performance of the processes of preparing the outer surface of the pipe and application of an insulating coating.
This problem is solved by the method of repair of the pipeline, in which on the road, in basic conditions, using complex equipment for repair of pipes/pipe sections, dismantled pipes/pipe section clear of the old insulation, for example, pre-use metal brushes with subsequent finishing cleaning the outer surface of the pipe/pipe sections, for example, using a water jet installation of high pressure and drying the outer surface of the pipe/pipe sections, prepare the outer surface of the pipe/pipe sections under the coating, for example, shot blasting (shot blasting) processing, insulate the outer surface of the pipe/pipe sections by applying protective coatings, such as polyurethane, IU the Odom airless spray heated outer surface of the pipe/pipe sections to accelerate the polymerization process of the protective coating, move pipe/pipe section to the place of storage, cleaning, preparing the outer surface of the pipe/pipe sections and the application of a coating are in the United mobile modules in the General flow of what each tube/pipe section is based on two trucks, depending on the nature of technological operations of each tube/pipe sections give a rotary motion in the longitudinal translational movement of the trolleys along the track, and the ends of the pipes/pipe sections for a length not less than 150 mm protects from the coating.
In addition, the task is solved by a complex of the equipment for repair of pipes/pipe sections when the repair of the pipeline, made of interconnected mobile modules, containing, respectively, the equipment for cleaning and drying of pipes/pipe sections, preparing their outer surfaces under insulation coating, applying an insulating coating, and containing a power unit, a compressor, a system of forced removal of harmful substances such as dust, when cleaning pipes/pipe sections, drives uninsulated and insulated pipes/pipe sections, lifting means for moving pipes/pipe sections, in which the modules are used for transport the containers containing the sections of rails the path of the transport system for the movement of trucks, that are the basis for pipes/pipe section, and the specified equipment is placed in transport containers along/on the sides of the respective sections of rail track, and in the joined end walls of the transport container is made is supplied with insulating flanges technological window for the passage of trucks with pipes/pipe sections.
This task is solved by a mobile module that contains a transport container, in which the railway transport system, the end wall of the container is provided with elements fixation and mounting attachable mobile modules of the complex of the equipment for repair of pipes/pipe sections, and equipped with technological Windows for passage movable on rail transport trolleys with pipes/pipe sections, insulating flanges for process window, while along/on the sides of the track in the direction of pipes/pipe sections is appropriate technological equipment.
This task is solved by a transport truck that contains a frame, movable on rails, wheels, support rollers, drive for rotation placed on the support rollers with their ends of the pipe/pipe section, and the traction drive wheels, this cart is equipped with screens for protection of all TRU the tube sections from the coating over a length not less than 150 mm
These set of features to ensure high performance at low cost, reduce the gap in time between the cleaning pipe and coating on its outer surface coating, since the operations of the method are carried out in basic conditions, where streamlined production work on the pipeline, which in turn improves the quality of insulation.
The complex of the equipment for repair of pipes mounted on a prepared base near the place of storage of pipes/pipe sections (hereinafter, pipes), removed during the repair of the pipeline.
The complex of the equipment for repair of pipes contains a device for removing the old insulation (pre-treatment) pipe/pipe sections, for example, using a metal brush to finish cleaning the outer surface of the pipe (for example, using a water jet high pressure units), equipment for drying the outer surface of the pipe, equipment, training their outer surfaces for insulation coating, for example, shot blasting plant, equipment for applying insulation coating, equipment for heating the outer surface of the pipe after applying the coating, transport carts moving along a track, the unit, the compressor.
The criminal code is itia to protect process equipment from rain and inclement weather made in the form of mobile modules - transport, for example, shipping containers, each of which railway transport system, the end wall of each container is equipped with a fixation and mounting attachable mobile modules of the complex of the equipment for repair of pipes, and is also provided technological Windows for passage movable on rail transport trolleys with pipes and insulating flanges for process window, while along/on the sides of the track in the direction of travel of the pipe is required technological equipment.
The mechanism of rotation of pipes/pipe sections and the mechanism of longitudinal movement of the transport trucks are located on the transport trucks.
Equipment for removal of old insulation, cleaning, drying the outer surface of the pipe is placed in the processing block, representing depending on the length of the tube/pipe sections of the transport container/containers. Equipment for preparing the outer surface of the pipe under the coating and for applying to a coating placed in the processing block, representing depending on the length of the tube/pipe sections of the transport container/containers. While working areas of these blocks are separated by a protective flanges, and performed in a single thread when the post what annoy longitudinal speed of the repaired pipe.
In addition, there are area loading pipes on the transport truck and accumulation of transport trucks after unloading insulated pipe, the drive serviceable pipes and the drive-insulated heating pipes.
The complex of the equipment for repair of pipeline works as follows.
Two transport carts are served in the area under the loading of the repaired pipe. Includes a rotation mechanism laid on the trolley pipes and mechanism of longitudinal movement of trucks, these mechanisms are designed to regulate the speed of rotation and longitudinal movement of the pipe due to the performance of the equipment. The pipe is fed to the pre-cleaning of its outer surface from the old insulation and enters the area where the equipment for finish cleaning the final cleaning of the pipe surface from the primer. Then the trumpet comes in the area of equipment for drying the outer surface of the pipe from possible residual moisture and then the pipe goes into the process unit where the equipment for preparing the outer surface of the pipe under the coating with the necessary degree of surface preparation, for example, Sa 2½.
Then the trumpet comes in the painting Department - zone equipment for applying an insulating coating, which were the focus of his application, for example, using pistols-spray installation airless spray. At each end of the insulated pipe for a length not less than 150 mm protects from coating the screen, which is installed on each transport cart. Available from insulation pipe ends then used for welding and Assembly operations. To speed up the process of polymerization of the insulating coating equipment is used to heat the outer surface of the pipe. In this technological area where pipe insulation coating is applied, is isolated from the portion where the cleaning of pipes and, therefore, dusts removed by the system of forced removal of harmful discharge - suction installation.
Saythaliasana pipe on transport trucks rolled into the area, where it is shipped to the storage area of the finished tubes in the drive of the finished tubes.
Transport carts are accumulated in the accumulation zone from further moving in the loading area of the pipe. Transfer trucks is carried out, for example, transport by crane to the removal from the track or at the end of the regulated period of time (for example, twice a day) transport truck serves on the track in the opposite direction to suspend the operation of complex equipment.
The dimensions of the loading zone tramposos to place subject to repair pipes on transport trucks before as the previous processed pipe is fully seated in the pre-cleaning of its outer surface. This is necessary to ensure that the processed pipe could form a single stream with a minimum clearance between the ends of the tubes, while the equipment of the complex, sequentially processing the pipe runs in a single prescribed mode when processing the entire party prepared for the repair of pipes.
As the time interval between cleaning the pipe surface and a drawing of her isolation is extremely small, the result is a dense monolithic insulation that protects the pipe from corrosion and well perceiving mechanical uniformly distributed loads and concentrated in the form of bumps and Siderov load on the pipeline.
Because of the quality of execution of work on pipe insulation depend on the duration and continuity of the steel pipe, the insulation be tested in all stages of its implementation.
Systematic quality cleaning pipes and insulated coating allows you to set the correct mode of movement of the tubes on the conveyor and to provide greater productivity and high quality of work performed. Suitable for use tubes labeled with the subsequent registration document quality pipe.
That is they way complex equipment in field conditions at the place of storage tubes removed during the repair of the pipeline, makes it possible underlying conditions in a single mode to repair the insulation coating of pipes repaired pipeline.
The invention provides for the removal of old insulation, cleaning and preparing the outer surface of the pipe, apply a new coating on the outer surface of the pipe in route conditions. While retaining all the advantages of factory conditions repair of pipelines with automation of these operations, while ensuring high performance of repair work, the high mobility of the complex and small technological areas.
1. The method of repair of the pipeline, in which on the road, in basic conditions, using complex equipment for repair of pipes/pipe sections, dismantled pipes/pipe section clear of the old insulation, for example, pre-use metal brushes with subsequent finishing cleaning the outer surface of the pipe/pipe sections, for example, using a water jet installation of high pressure and drying the outer surface of the pipe/pipe sections, prepare the outer surface of the pipe/pipe sections under the coating, for example, shot blasting (shot blasting) processing, insulate exterior surfaces shall be of pipes/pipe sections by applying a protective cover, for example, polyurethane, airless spray heated outer surface of the pipe/pipe sections to accelerate the polymerization process of the protective coating, move pipes/pipe section to the place of storage, cleaning, preparing the outer surface of the pipe/pipe sections and applied to the insulating coating are in the United mobile modules in the General flow of what each tube/pipe section is based on two trucks, depending on the nature of technological operations of each tube/pipe sections give a rotary motion in the longitudinal translational movement of the trolleys along the track, and the ends of the pipes/pipe sections on length not less than 150 mm protects from the coating.
2. The complex of the equipment for repair of pipes/pipe sections when the repair of the pipeline, made of interconnected mobile modules, containing, respectively, the equipment for cleaning and drying of pipes/pipe sections, preparing their outer surfaces under insulation coating, applying an insulating coating, and containing a power unit, a compressor, a system of forced removal of harmful substances such as dust, when cleaning pipes/pipe sections, drives uninsulated and insulated pipes/pipe sections, protopad the roadways means for moving pipes/pipe sections, in which the modules are used casks, containing sections of rail transport system for the movement of trucks, which are based on pipe/pipe section, and the specified equipment is placed in transport containers along/on the sides of the respective sections of rail track, and in the joined end walls of shipping containers are made equipped with insulating flanges technological window for the passage of trucks with pipes/pipe sections.
3. Mobile module containing a transport container, in which the railway transport system, the end wall of the container is provided with elements fixation and mounting attachable mobile modules of the complex of the equipment for repair of pipes/pipe sections, and equipped with technological Windows for passage movable on rail transport trolleys with pipes/pipe sections, insulating flanges for process window, while along/on the sides of the track in the direction of pipes/pipe sections, is appropriate technological equipment.
4. Transport trolley containing a frame, movable on rails, wheels, support rollers, drive for rotation placed on the support rollers with their ends of the pipe/pipe section, is also driving the running wheels, when this transport trolley equipped with screens for protection of ends of pipes/pipe sections from the coating over a length not less than 150 mm
SUBSTANCE: seam design for overlapping (5', 5) from an aluminium foil designed to cover and simultaneously close a cut (2', 2) in a section (1', 1) of pipe insulation from mineral wool coated with a shell (4', 4) of aluminium foil. Besides, the shell at the side facing the mineral wool is coated with a layer (8', 8) of polyethylene, by means of which it is attached to the outer layer of mineral wool of an insulating section. Besides, a double-sided adhesive tape (7', 7) is applied as overlapping onto the layer (8', 8) of polyethylene to fix the overlap (5', 5) to the foil of the shell (4', 4) arranged at the other side of the cut in the insulating section. On both sides of the double-sided adhesive tape (7) there is one and the same adhesive composition, and one of the tape sides is connected to the layer (8) of polyethylene on the inside of the overlap (5) of the shell (4) of the aluminium foil, when the polyethylene layer is in melted condition. The invention also relates to the method for arrangement of the above seam for overlapping.
EFFECT: reduced total fire load, reduced total weight.
7 cl, 4 dwg
FIELD: machine building.
SUBSTANCE: procedure for fabrication of insulated unit "pipe-in-pipe" consists in following stages: in facilitating unit containing at least one internal pipe and external pipe surrounding at least one internal pipe creating circular space between external surface of at least one internal pipe and internal surface of external pipe. There is also at least one container located in circular space. It contains porous flexible volumetric compressed material of porous particles. It is compressed in the container and has the first volume less, than volume of not compressed material. The procedure also consists in change of at least one container to reduce compression of compressed material to the second volume exceeding the first volume, thus creating an insulating unit "pipe-in-pipe". There are also disclosed versions of the insulating unit "pipe-in-pipe".
EFFECT: improved heat insulation of pipelines.
SUBSTANCE: unit (1) of hardened tubular section from production line is finished by cutting its uneven ends off. At least part of cut-off ends (2) of units (1) of the tubular section is crumbled into particles and together with all materials contained in them are re-used in at least one of earlier stages of tubular section production. Cut and crumbled ends (13) are uniformly distributed over not hardened containing binding substance mat (3) out of mineral cotton along its total width prior to its winding around core (16) and forming a tubular section out of it. Also, crumbled cut ends (13) do not get to front and back ends of mat (3). The system consists of at least breaker (10) for crumbling cut ends (12), of shredder (11) with a distributor of crumbled cut ends (13) of transport device (5, 6) for transporting cut ends (2) to a preceding stage of fabrication.
EFFECT: improved procedure.
13 cl, 2 dwg
SUBSTANCE: invention is related to heat insulation of pipes, namely to methods for formation of external heat insulation cover of foaming materials, such as polyurethane foam, on pipes intended for transportation of coolant or freezing liquids. In method of heat insulation of pipe for air, ground and underground installation, previously arranged sections of thin-sheet rolled metal shells are installed concentrically versus insulated pipe, which simultaneously perform functions of heat insulation shape and protective coat, annular cavity between pipe and shell is filled via longitudinal joint of open shell with polyurethane of poured grades, longitudinal joint of shell is closed with overlapping of edges, and heat insulation material is tempered for some time for structuring.
EFFECT: possibility to install heat insulation in the field.
FIELD: construction industry.
SUBSTANCE: according to presented method for forming of, actually, cylindrical insulating blank, cotton-wool is supplied in form of loose material to spacing between core and, actually, cylindrical external form enclosing core. For fixation of form of pipe section blank its inner and outer surfaces are heat-treated by means of heating of at least part of core and external form. Then processing of unprocessed layer located between processed inner and outer surfaces is performed. Forming device contains area of pipe section formation, this area consists of core and, actually, cylindrical external form enclosing it, and also of device for final thermal processing of formable pipe section.
EFFECT: invention provides continuity of process of pipe section forming, absence of waste material, it allows to change length of product depending on customer's requirements.
28 cl, 3 dwg
SUBSTANCE: in method of manufacturing of foam polymer heat insulation on pipes, including installation of insulated pipe in metal mold, made by hingedly joined segments of pipes, filling of gap between pipe and mold with hardening heat-insulating mixture, further exposure until mixture hardens and mold removal, to facilitate air exhaust and reduce formation of fin, prior to heat insulation mixture pouring, insert is installed in mould from sheet material with width that provides for coverage of its long edges with an overlap, and pouring is executed into gap between insert and pipe.
EFFECT: facilitates air exhaust from filled gap and reduced formation of fin.
3 cl, 2 dwg
FIELD: process engineering.
SUBSTANCE: proposed flexible pipe consists of at least one inner pipe, one outer pipe and heat-insulating layer from polyurethane or polyisocyanurate foam arranged between aforesaid inner and outer pipes. Note that hollow balls are added to aforesaid foam in the amount of 0.1% to 7.5% by weight. Note also that aforesaid balls are furnished with thermoplastic synthetic material and filled with medium which, at higher temperature, facilitates inflating balls enclosure. Invention covers also the method of producing water supply pipe wherein hollow balls are added to polyol, isocyanate, foaming substance or mix of polyol, and foaming substance isocyanate in mixing chamber.
EFFECT: higher pipe flexibility.
FIELD: technological processes.
SUBSTANCE: invention is related to the field of heat insulation of pipelines. In method for manufacture of foamed or blown casing for flexible heat insulated pipeline mixture is made of granulated material based on polyethylene and granulated material based on polyethylene, to which expanding additive is mixed in the form of hollow balls, at that mixture is placed in extruder, melted in it, and melt is extruded in the form of pipe and foamed or blown in process of exiting or after exiting from extrusion nozzle, at that ratio of granulated material based on polyethylene and granulated material on the basis of polyethylene, to which expanding additive is mixed, is between 90:10 and 99:1.
EFFECT: improved performance characteristics.
8 cl, 1 dwg
SUBSTANCE: invention refers to heat insulating element fabricated out of thermo-resistant material, preferably out of mineral cotton and, in particular out of mineral cotton "rockwool"; also heat insulating element (1, 1a) can be inserted into opening of wall, ceiling or covering or similar structure and has at least one opening along linear axis passing through the heat insulating element. At least one tubular cover (3, 3a, 3c) is installed into the opening; this cover is fabricated out of heat resistant fiber material in form of winding, preferably out of mineral cotton and, particularly out of mineral cotton "rockwool", wherein a hot pipe is inserted; notably, fibers of this tubular cover are in essence of two-dimensional orientation in the direction along circumference of the cover.
EFFECT: development of insulating element with upgraded heat-resistant properties.
24 cl, 5 dwg
SUBSTANCE: proposed centering support for inner pipe comprises clamp with clamping lock enveloping the inner pipe and posts arranged radially on the clamp to fix the inner pipe position in the outer pipe. Aforesaid clamp is made in plastic material, said posts are made integral with the clamp and represent flat plates fitted along the inner pipe axis. The posts ends accommodate load-bearing blocks, while the clamping lock represents rack arranged on one end of the clamp and bent along the inner pipe surface and mating rack arranged opposite the former rack. There is slot-like passage formed for the rack to pass therein. The cross section of the rack, mating rack and guiding strip features one ledge.
EFFECT: simpler design.
2 cl, 2 dwg
FIELD: machine building.
SUBSTANCE: proposed method comprises contactless unearthing, removing damaged coating, pipe surface processing, applying new coating and burying repaired pipeline. Pipeline separate equal-length sections are unearthed while all process job time intervals are equal. Said removing damaged coating, pipe surface processing, and applying new coating are executed without contact between process equipment and pipeline surface and spark-forming mechanical contact of work tools.
EFFECT: repair without interrupting transfer of product, reduced repair interval.
FIELD: machine building.
SUBSTANCE: before insertion of sleeve inside pipe bandage of fibrous material is fixed on internal surface of pipe by means of metal band impregnated with solidificated binding. There is formed an open circular section of the bandage. A tube-like sleeve of fibrous material is inserted inside the pipe. The sleeve is impregnated with solidificated binding and is enclosed into a flexible casing of polymer material. Further, the sleeve is reversed and moved inside the pipe, is straightened and pressed to internal surface of the pipe due to pressure of water on internal surface of an inverted sleeve. The bandage is solidificated simultaneously with the sleeve.
EFFECT: reduced amount of air in space between internal surface of pipe and sleeve inserted into pipe; elimination of working fluid leakage between internal surface of pipe and external surface of solidificated sleeve coating.
FIELD: machine building.
SUBSTANCE: procedure for application of protective enamel on internal surface of pipe consists in preliminary surface cleaning, in application of enamel and in drying. Also, initially pipe is heated and dried by blowing air of t=+40÷80°C through it. Further, internal surface of the pipe is cleaned by an abrasive-jet method for elimination of impurities and obtaining roughness as high, as RZ 40, where upon dust is removed by air blowing. There are applied not less, than two layers of enamel. Each wet layer of enamel has thickness, as high as 90÷180 mcm. Each enamel layer is dried at flow rate 2÷8 m/sec by blowing air of temperature +15÷25°C through pipe during not less, than 3 hours. Interval between application of layers should last no more, than 24 hours. Here is also disclosed the procedure for control over application of a protective cover on internal surface of the pipe. A sample in form of a cylinder of length equal to 0.5-1.5 diametre of a pipe is cut out from the pipe with protective enamel applied on it as a coating. The sample is subjected to compression in a radial direction till coating fractures. Quality of protective coating is determined by a value of deformation of the sample at the moment of detection of this coating fracture.
EFFECT: simplified process, raised efficiency, reduced power input and upgraded quality of coating.
FIELD: machine building.
SUBSTANCE: installation for trenchless repair of pipelines consists of drum with cloth shell wound on it, of bath for impregnation of this shell with polymer composition, of hollow cantilever for laying cloth shell into film sleeve, and of pneumatic-mechanical gate with pressure gauges and valves arranged on it. The bath is equipped with freely rotating rollers and has a cover with an opening hatch for refilling polymer composition and with thermo-electric heaters for polymer composition controlled heating. In the cover from the side of the bath there are made two slits opposite to each other for input and output of the cloth shell. The bath, the cover and its hatch have heat insulation coating on external side.
EFFECT: impregnation of cloth shells with polymer composition at low ambient temperature and accelerated impregnation, increased efficiency of installation for trenchless repair of pipelines.
FIELD: machine building.
SUBSTANCE: input consists of band of fireproof material arranged on plastic tube and of a collar to fix band of fireproof material on plastic tube. The band of fireproof material and the collar only partially envelopes the plastic tube.
EFFECT: compact positioning of wall or ceiling input.
13 cl, 8 dwg
SUBSTANCE: threaded joint for pipes (the first version) comprises a rod (100) and a body (200) elements. The rod element has a thread adapted for matching with the body element. The thread shape and the rod and body elements shape are determined by the thread profile, where the thread surface has a coating. This coating contains the first layer (24) with high friction and antiscoring properties, applied onto the whole surface of the rod element (100), and the second layer (25) with low friction properties applied into separate parts of the surface of either only the rod element, or only the body element. The threaded joint for pipes (the second version) comprises a rod (100) and a body (200) elements. The rod element has a thread adapted for matching with the body element. The thread shape and the rod and body elements shape are determined by the thread profile, where the thread surface has a coating. This coating contains the first layer (24) with high friction and antiscoring properties, applied onto the whole surface of the body element (200), and the second layer (25) with low friction properties applied onto separate parts of the surface of either only the rod element, or only the body element.
EFFECT: increased efficiency of the structure operation, its resistance to corrosion.
48 cl, 12 dwg
FIELD: machine building.
SUBSTANCE: anti-corrosion coating is applied to inner pipe surface, bushes made from corrosion-resistant metal and having on outer surface the sealing layers in the form of elastic coating are installed inside ends of pipe with covering some part of coating and bushes are fixed by their expansion till they tightly touch inner pipe surface. Sealing layer can be made from elastic polymer material.
EFFECT: reducing labour intensity of production and reducing the cost of products.
6 cl, 3 dwg
FIELD: machine building.
SUBSTANCE: first, before welding end of pipeline, heat-shrinkage clutch-bushing is positioned on pipeline close to joint. Upon joint welding, insulated surface is cleaned with metal brushes and dried from moisture. Prime coating - "liquid" primer and mastic band corresponding to coating with 80…90 degrees C temperature of mastic material softening are applied on this surface. Further, the heat-shrinkage clutch-bushing is pushed to a zone of a welded joint symmetrically to it and is heated to temperature 110…120 degrees C. Simultaneously, layers of the mastic band are heated and melted through the heat-shrinkage clutch-bushing ensuring pressure onto melted mastic of the mastic band and filling interstices with it in a zone of welding joint strengthening (hemi-spherical zones) and places of transition to base coating and overlapped layers of the mastic band. Insulating coating of the welded joint of the pipeline contains prime coating- "liquid" primer, the mastic band made either in from of a polymer-bitumen with base out of polyvinylchloride with mastic of 80…90 degr. C of softening, or in form of a base-less material consisting of polymer-bitumen mastic with softening temperature 80-90 degrees C and glass mesh. Also insulating coating consists of the heat-shrinkage clutch enveloping the pipeline and made in form of a solid bushing out of a sheet of light- and heat stabilised one-layer polyethylene modified by radiation-chemical method. The clutch is installed on the pipeline before pipeline joint welding and can travel along axis of the pipeline.
EFFECT: raised efficiency of anti-corrosion protection due to increased resistance of insulation coating.
2 cl, 2 dwg
FIELD: machine building.
SUBSTANCE: according to procedure surface of isolated coupling is prepared and rolled adhesive material is applied on prepared surface. Material is heated to softening; a section of thermo-contracting polymer band is placed on a softened layer. Ends of the band are connected with overlap, thereby forming a collar. A locking plate is put on the point of ends connection; further, the collar is thermo-contracted.
EFFECT: raised adhesion of insulating collar to surface of coupling and increased period between repair operations for re-insulating coupling of pipeline.
FIELD: oil and gas production.
SUBSTANCE: method for manufacturing a tubing string involves coating formation on its internal surface. The coating represents at least one polyurethane coating layer containing ureal groups with their mass fraction in the coating makes 6 to 14%. Total coating thickness is within the range 10 to 500 microns.
EFFECT: increased service durability of the tubing string ensure by more efficient deposit protection and abrasive, hydroabrasive and corrosive wear.
9 cl, 5 dwg
SUBSTANCE: device comprises drive and rod provided with a set of flexible collars that are in a contact with the inner surface of the pipe. Between the collars is the vessel. The brush is mounted downstream of the batching collar. The vessel that is open from above is filled with a polymeric material to be applied to the pipe, and the device is set in the pipe. The device moves along the pipe and rotates simultaneously. The polymeric coating is made preliminary by the batching collar, and the brush downstream of the batching collar provides finishing leveling of the coating in thickness.
EFFECT: expanded functional capabilities.