The way to recover the metal underground gas pipeline
(57) Abstract:Usage: in the field of pipeline construction. The essence of the invention: method for recovery of metal underground pipeline, comprising cleaning the inner surfaces against rust, tarnish, burrs and placement inside plastic pipes by pulling, before pulling the polyethylene pipe to its bottom surface attached feet with a height of ensuring the alignment of existing and jam through pipes and slope and curvature in the lower part by direction of the pulling polyethylene pipes, while at the end of the pulling of polyethylene pipes in the space between its outer surface and the inner surface of the metal pipe, fill-curing composition having a low coefficient of thermal conductivity. 1 C.p. f-crystals, 3 ill. The invention relates to the field of construction and for the restoration of degraded underground metal pipelines.A known way to recover the metal underground gas pipeline, including the locations of pouria method is its high cost.The closest in technical essence and the achieved result to the invention is a method for the recovery of metal underground pipeline, comprising cleaning the inner surfaces against rust, tarnish, burrs, etc. and placing inside plastic pipes by pulling 
The disadvantage of this method is the possibility of formation around the pipeline below the border, seasonal soil freezing, icy halo during transportation of natural gas at a temperature below 0oC and subsequent "ascent" of the pipeline.The objective of the invention is the prevention of educational opportunities around the pipeline below the border, seasonal soil freezing, icy halo during transportation of natural gas at a temperature below 0oC and subsequent "ascent" of the pipeline.Required technical result is achieved by the fact that the current way to recover the metal underground pipeline, comprising cleaning the inner surfaces against rust, tarnish, burrs, etc. and placing inside a polyethylene tube method procaccianti appoint, based on the need coaxially location of existing and jam through the pipes, and these strips are carried out with a slope and curvature in the lower part by direction of the pulling polyethylene pipes, however after pulling the plastic pipe space between its outer surface and the inner surface of the metal pipe filled hardening composition having low thermal conductivity.The result is achieved that, as a curing composition used baumgartenberg mixture.Attaching to the bottom surface of polyethylene pipes before dragging anchor pads allows you to adjust the position of the plastic tube inside the metal and to avoid direct contact between the walls of these tubes; the appointment of a height of the supporting strips, based on the need coaxially location of existing and jam through pipes allows to achieve the optimal arrangement of pipes (a constant value of the distance between the outer surface of the polyethylene pipe and the inner surface of a metal pipe); run spacers with tilt and curvature in the lower part of the incurred distortions; filling the space between the outer surface of the polyethylene pipe and the inner surface of the metal pipe hardening composition having low thermal conductivity, allows you to save on the outer surface of the pipeline a positive temperature during transportation of natural gas at a temperature below 0oC, i.e., to avoid the formation around the pipeline icy halo; used as a hardening composition baumgarteni mixture also allows you to keep a positive temperature on the outer surface of the pipeline.A comparison of the claimed technical solution with the prototype allowed us to establish its compliance with the criterion of "novelty", as it is not known from the prior art.The proposed method is industrially applicable existing technical facilities and meets the criterion of "inventive step", as it is not obvious from the prior art, while the latter is not identified prescribed transformation characterized by distinctive features of the prototype of essential features necessary to achieve the technical result.Thus, the proposed tihohodnogo destination with such significant signs the applicant is not found.In Fig. 1 shows the pipeline after the implementation of the proposed method to restore his health (longitudinal section); Fig. 2 section a-a in Fig. 1; Fig. 3 node I in Fig. 1.The way to recover the metal underground pipeline according to the invention implemented as follows.The inner surface 1 came in defective condition of underground metal pipeline 2 in a known manner is cleaned from rust, tarnish, burrs, etc., On the bottom surface of the plastic pipe 3 is fixed supporting strip 4, and the height "h" designate, based on the need coaxial arrangement of the metal of the pipeline 2 and the plastic pipe 3. In the manufacture of the support strips 4 at their end facing in the direction of pulling, perform a slope of 5 and the curve 6 in the lower portion. Then on the pipeline 2 produce placement of polyethylene pipe 3 by the method of pulling on the plot of a set of annular plugs 7, in close proximity to them in the pipeline 2 cut fitting 8 and by a pump (not shown) into the space between the inner surface 1 of the pipeline 2 and the outer surface 9 polri one of the fittings 8 are used for feeding curing composition 10, and the other for air exhaust from the annulus.The economic effect from the use of the invention to the precise calculation is not difficult. The positive effect is that it prevents the formation around the pipeline icy halo and subsequent "ascent" of the pipeline. 1. The way to recover the metal underground pipeline, comprising cleaning the inner surfaces against rust, tarnish, burrs, etc. and placing inside plastic pipes by pulling, characterized in that before pulling the polyethylene pipe to its bottom surface attached feet, the height of which is prescribed based on the need coaxially location of existing and jam through the pipes, and these strips are carried out with a slope and curvature in the lower part by direction of the pulling polyethylene pipes, however after pulling the plastic pipe space between its outer surface and the inner surface of the metal pipe filled hardening composition, having a low coefficient of thermal conductivity.2. The method according to p. 1, characterized in that
FIELD: oil extractive industry.
SUBSTANCE: device has inner and outer pipes, placed coaxially with forming of ring-shaped space between them. Ring-shaped space is pressurized by vacuum seams, thermo-isolation is placed therein and vacuum is formed, on both sides of outer pipe thread is made, on one end thereof sleeve is screwed with isolating bushing. Vacuum seams are made at even spaces from ends of outer pipe, calculated from formula L=K·β, where L - distance between vacuum seam and end of outer pipe, mm; K - number of predicted maintenances of threads of thermo-isolated pipe; β - value of shortening of thermo-isolated pipe after single thread maintenance, mm. Also described is another variant of thermo-isolated pipe, wherein vacuum seams are made at different spaces from ends of outer pipe. Distance on side of sleeve is calculated from formula: LM=KM·β, where LM - distance between vacuum seam and end of sleeve end of outer pipe, mm, KM - number of predicted maintenances of thread of sleeve end of thermo-isolated pipe; β - value of shortening of thermo-isolated pipe after single thread maintenance, mm; and on nipple side space is calculated from formula: LH=KH·β, where LH - distance between vacuum seam and end of nipple end of outer pipe, mm; KH - amount of predicted maintenances of thread of nipple end of thermo-isolated pipe, while KM<KH.
EFFECT: higher efficiency.
2 cl, 1 dwg
FIELD: oil and gas extractive industry.
SUBSTANCE: pipe has bearing pipe and concentrically placed thermo-isolated covers, between which end diaphragms are rigidly fixed and a space is present between covers at contact lines. Isolated covers in sections are made linearly of two portions and different metals, and rigidly connected in contact to each other, one portion whereof is made of common assortment, and other one is made of metal capable of remembering shape. Linear length of current engaged portion of the latter is determined on basis of length of sections and temperature difference of inner cover and outer bearing lifting pipe.
EFFECT: higher reliability.
2 cl, 1 dwg
FIELD: building units, particularly for heat insulation.
SUBSTANCE: article comprises layer of heat-insulation material and mineral fiber material having opposite sides, two major surfaces and thickness defined by above surfaces. Article includes fastening means to provide article fixation. Fastening means extends from the first article end in the first direction substantially parallel to one major surface. The first and the second ends of fastening means adjoin corresponding layer side. Fixing means may be increased in length to secure article to building structure so that fixing means may extend outwards from article sides. Length increase is carried out by applying pulling force to fixing means end.
EFFECT: provision of article adjustment in length and shape, possibility to connect article to itself, to adjoining sheets, to structure to be insulated and so on.
26 cl, 6 dwg, 2 ex
SUBSTANCE: butt joint comprises heat insulating material interposed between the outer side of pipes to be joined, faces of the heat insulating material, and inner side of the polymeric shell made of semirings, polymeric clutch mounted in the zone of butt joining, and waterproofing material between the outer side of the polymeric shell, faces of the waterproofing material of the pipeline, and inner side of the polymeric clutch. The heat-insulating material interposed between the outer side of the pipes to be joined and the inner side of the polymeric shell are made of semirings which are made in block with the semirings of the polymeric shell. The electric heating members are arranged over the periphery of the ends of polymeric shells of pipes between their outer sides and inner side of the polymeric clutch. The heating members can be connected with a power source. The sites of butting the polymeric shell of the semirings are provided with applicator. The semirings should be pressed with banding belts to the outer side of the polymeric shell.
EFFECT: enhanced reliability.
39 cl, 7 dwg
FIELD: pipeline insulation from heat-retention polyolefin foam.
SUBSTANCE: invention relates to method for production of physically foamed heat-retention polyolefin foam and expanded material made from the same. Polyolefin foam is obtained by extrusion of expanded material composition containing (mass %): metallocene polyethylene 77-92; antipyrene 5-10; cell stabilizer 3-8; and other additives 0-5 % using physical foaming agent. Flexible expanded material of present invention has wide-range application, in particular it is useful as insulator for thin and/or twisted pipelines. Forasmuch foam is obtained using physical foaming agents and is not chemically cross-linked it may be reprocessed for reutilization.
EFFECT: flexible heat-retention polyolefin foam of improved quality.
10 cl, 1 ex
FIELD: pipeline transport.
SUBSTANCE: pipeline comprises metallic pipe provided with a heat insulating coating and outer nondetachable polymeric water proofing shell. The heat insulating coating is made of polyurethane based on ozone-nondestructive freons, the volume composition of closed pores of which after foaming and foam solidifying is at least 88%. The polyurethane composition before foaming comprises water, ozone-nondestructive soft freon, and polyisocyanate . The water proofing shell is made of a low-pressure polyethylene.
EFFECT: reduced heat losses and prolonged service life of hydraulic insulation .
FIELD: pipeline engineering.
SUBSTANCE: multi-layered heat insulation is made of centering members and preliminary activated gas absorbers, which are set on the clean surface of the inner steam-conducting pipe and plates of vacuum-screen insulation, which are sewed along the steam-conducting pipe. The inner surface is sealed and evacuated. The heat insulating material are made of, e.g., unwoven fiber glass cloth.
EFFECT: enhanced efficiency of insulation.
FIELD: pipeline transport.
SUBSTANCE: method comprises setting and sealing the shell, applying heat insulating composition on the pipe, and foaming and solidifying the composition. The heat insulating composition is made of liquid polyurethane foam. The heat insulating composition is applied on the steel pipe by preliminary setting centering supports made of polyethylene. The conductor-indicators are simultaneously mounted. The axes of the waterproofing shell and the pipe are then aligned by moving the shell onto the pipe, which is provided with centering rings. The "pipe-inside-pipe" structure is heated in a furnace and then is fed to the sloped table for filling structure with polyurethane foam. The faces of the structure are plugged. The interpipe space is filled with the polyurethane foam and, after the solidification of the composition, the plugs are removed and the faces are covered with a waterproofing material.
EFFECT: enhanced efficiency of insulating.