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 [2]

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

 

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