DE1924971A1 - Heat-insulating lining from oil pipe lines - Google Patents

Abstract

Foil of coating material is stored as a roll. The latter is arranged vertically to the ppipe axis, unrolled parallel to the pipe and directed onto the latter in such a way that it surrounds the pipe in the form of a continuous tube whose edges are connected parallel to the pipe axis. Specifically, the edges are welded or glued together and covered by a band which is attached by gumming or welding. The coating is pref. of polyvinyl chloride, polyethylene or an elastomer such as butyl polyurethane.

Description

Method and device for lining pipelines The invention relates to a method and devices for lining pipelines, in particular can already be provided with a heat-insulating layer and the are intended for the transport of hot or cold media.

The lining of the insulating layer of these pipelines, which Laying in the ground or in the open air is said to have a number of properties have, in particular the following: It should always be completely leak-proof be.

It should be pliable enough to allow slight ground shifts without breaking withstand as well as the displacements due to the expansion and the deformations the irregularities in a rocky environment.

It should be sufficiently rigid so that it can be, including the insulating The material that covers it, in its entirety, is not deformed under the pressures as a result of the digging.

You want quick connections and secure, comfortable seams right now allow the relocation.

If necessary, it should be able to be relocated continuously, and at speeds that are generally used in clothing and laying used by oil pipes.

It is said to be chemically inert and resistant to attack by Rodents, mold, roots, etc.

be.

The currently commonly used clothing methods include to the following three major types: a) The clothing is formed from a tube, which is concentric to the pipeline that transports the liquid. Of the Gap between the pipe and the pipeline becomes partly or completely filled with insulating material. The outer tube is sometimes made of metal, sometimes made of plastic such as polyethylene or vinyl chloride. The insulating Material for tubes made of plastic material often consists of organic foam, such as Polyurethane foam that expands in place in the annular space.

With this type of clothing, the insulated ones are clad Prefabricated pipelines manufactured in the factory in limited lengths: for example 6 m.

They are then laid discontinuously and they are welded respective ends of the pipelines with each other, the outer tubes being shorter are. The outer tubes are then connected to a sleeve by welding (Socket, sleeve), and after this connection one fills the at the connection point left free annular space with self-expanding and / or pourable Isolating agent. When using a rigid isolating agent However, this is applied before the shell is welded.

The main disadvantage of this process is that it is discontinuous Assembly requires numerous welded joints and, if necessary, one in sections Route.

b) The clothing is made of ribbons made of plastic materials, in turns with partial coverage in one or more layers the insulation (polyurethane foam, fiber material, etc.) must be applied. The ribbon can be adhesive or adhere to the previous tape by interposing an adhesive with and without heating. The length of the glue line, the necessary Delicacy in the product, the difficulty in applying it on an often irregular surface and the relatively soft surface of the insulation cause this process is not always completely sure about the tightness.

c) The cladding is formed from a product that was laid when it was laid is liquid and solidifies rapidly, either because it is at the moment of application has been heated, or because it polymerizes or sets over time in the cold. This product is applied by dipping or spraying Spread on. Sometimes you bring in mechanical reinforcement this A glass fiber veil, a textile fabric, etc.

The garments produced in this way have, if they are of small thickness errors that are analogous to those of the method described above. If they are of great thickness, their price is high, the hardening time is long, and the fragility is high great for shifts.

The aim of the invention is the production of thermal clothing insulated pipelines that meet the requirements listed above. In particular, this clothing should be able to be laid continuously and have every security in terms of tightness and mechanical resistance.

The inventive method is characterized in that one starts from a film made of the material that is to form the clothing, whereby the film is kept in stock as a roll, so that the roll is essentially vertical to the axis of the pipeline arranges that the film is initially parallel to the pipeline let it roll, that one then directs it towards the latter and that one can do it that way leads that it progressively surrounds the pipeline forming a continuous one Tube, the edges of which are connected to each other parallel to the axis of the pipeline.

The edges of the foil used to clad the pipeline can be abutting or overlapping.

Their union can be made by welding or Gluing along a surface line, preferably the upper one, of the tube formed.

You can also apply a tape over the connection of the edges of the film, which in turn can be glued or welded.

The film forming the covering of the pipeline can have a thickness of 0.5 to 5 mm and came from semi-rigid material that can be welded or can be glued.

It is preferably made of a plastic material such as polyvinyl chloride, Polyethylene or an elastomer such as butyl, polyurethane.

You can also use a film made of a material that is used in the Ambient temperature is relatively rigid and that one at the moment of use can soften sufficiently by heating.

According to another feature, the method of the invention is thereby characterized in that the thermal insulation on the pipeline immediately before the beginning of the turning over of the clothing film forms. This thermal insulation can are made by means of strips of glass fiber mats, which are wound onto the Pipeline to be wound up.

It can also be made from shells made of insulating material.

According to another characteristic, the invention is characterized in that that the thermal insulation is carried out in place on the pipeline by means of a cellular material obtained by foaming an expandable resin such as polystyrene, polyurethane, etc., which can be expanded by a propellant is made.

This production of thermal insulation by means of a cellular material can be made prior to the formation of the garment tube or in the same tube after their manufacture.

The invention also relates to a device for implementation of the method according to the invention. This device is characterized by that it has a carriage that extends along the pipeline to be covered moves and who carries the role with the clothing material as well as the organs for Guiding the film coming from the roll.

According to a further feature, the device according to the invention characterized in that for guiding the film during the process of wrapping the Pipeline an organ in the form of an inlet channel is used.

According to a further feature, the device according to the invention characterized in that the carriage is provided with a rotating disc on which the rollers are mounted with insulating tape that wraps around the pipeline squirm while providing thermal insulation at the same time as forming the garment tube form.

Further features and advantages of the invention emerge from the following Description, referring to ways of performing the procedure and to a mode of execution of a device, which are given as non-limiting examples of the scope of protection given are. In this description, reference is made to the drawing. In this 1 shows a perspective view to illustrate the method; Fig. Fig. 2 is a side view showing the formation of thermal insulation by foaming a resin on the tubing prior to forming the tube; Fig. 3 is a side view showing the formation of the insulation by foaming a resin on the Piping in the tube as it is being formed; Fig. 4 is a side view a device with slide; Fig. 5 as a round image, a vertical section of the Clothing covering zone; FIG. 6 is a partial view, analogous to FIG. 4, of a variant of the invention.

Fig. 1 shows at 1 the pipeline to be clad. This pipeline is with a thermal insulation 2 from a winding in turns of tapes, strips or the like. made of insulating material. These strips of insulating material can, for example consist of resin-bonded glass fibers, these bands are reinforced by Longitudinal seams made of textile threads, as described in French patent 1,495,614 is described by the applicant. One can also use bands made of mineral mats Use fibers, especially glass fibers, in which the cohesion is effected through organic or mineral fibers that penetrate the mats in their thickness, as proposed by the applicant according to the French patent application No. 150 268 and the German patent application P 19 19 709.2.

The film that forms the cladding of the heat-insulated pipeline is held in stock on a roll 4, the axis of which is perpendicular to the axis the pipeline 1 is; the sheet 4 unwinds in a flat state until it unfolds at 5 then directed towards the pipeline, which then surrounds it progressively below Passage through a guide member 6 in the form of an inlet channel, which the film wraps around itself, causing the thermal insulation 2 to be enveloped. The two edges of the foil that come together at 7 are attached to each other either by welding or by gluing. The process takes place continuously, wherein the arrangement of the roller 4 and the inlet channel 6 with respect to the Pipeline moved on.

A band 8 can be provided to cover the edges in the film, this tape in turn can be glued or welded.

For testing the tightness of the cladding formed on the pipeline you can put one on the liner on the side facing the pipeline Provide thin self-adhesive metal strips. The test can be carried out by means of a device for electrical glow discharges, the sliding contact of this device slides along the joint of the cover and with the adhering metal tape connected to the earth.

Fig. 2 shows a device with which one on the pipeline forms thermal insulation by expanding a thermoplastic resin that you can foam in a mold 9, which slides on the pipeline at the same time the arrangement of the roller 4 and the inlet channel 6.

The liquid resin comes into contact with the pipeline at 10 and 11 brought. In zone 12 it begins to expand; its expansion is complete finishes at 13 and it's already half hard. At 14 the expanded resin is sufficient rigid in order to be covered with the clothing film can.

In the variant shown in Fig. 5, the expansion of the Resin directly at the point where the clothing is formed. The liquid one Resin is added at 15, it is creamy at 16, and starts at 17 it to expand. The resin is fully expanded at 18 and fills. the space between the pipeline 1 and the tube 19 formed. In this case, the inlet channel 6 serves on the one hand to form the clothing tube 19 and on the other hand to produce the necessary mechanical resistance for Absorption of the pressure from the expansion of the foam.

The apparatus shown in FIG. 4 for continuous production the thermal insulation 2 and the outer clothing comprises a carriage 20, the is provided with rollers 21-22 which are in contact with the pipeline 1. This carriage is self-propelled and has a motor 23, which is interposed a countershaft 24 drives one of the rollers 21. The chassis 25 of the engine is on mounted on the slide with the interposition of screw brackets 26 which the regulation of its position in height according to the diameter of the pipeline 1 allow. For the same purpose, the lower rollers 22 are in turn adjustable Mounts 27 mounted, which allow a change in their position.

A rotating disk 28 is mounted on the carriage 20, which Bear rollers 29 with insulating tape 30. This disc is driven by the motor 25 with the interposition of a transmission 31 at its output has a pinion which is in engagement with an internally toothed ring on the Disc.

The roll 4 with the film 5, which is the clothing of the heat-insulated Is to form the pipeline is mounted on the carriage 20. The slide 3 runs through between guide rollers 32-3S and is inserted into the guide channel 6 initiated, which is attached to the carriage by means of articulated rods 54, 55, 36 is. The slide causes continuous further movement on the pipeline 1 20 at the same time the formation of the thermal insulation 2 and the formation of the outer clothing 19th

An adhesive tape 37 coming from a roll 38 is applied to the edges of the Clothing applied by means of a roller 39, the support 40 for the role 38 and the pressure roller 39 are attached to the inlet channel 6. It's a feather 41 or the like. provided to push the roller 39 against the tube.

In Fig. 5 the zone of coverage by the adhesive tape 37 is on top Clothing 3 shown.

In the variant shown in FIG. 6, the two edges are the film 3 is welded by fusing. This amalgamation is effected by means of a device which is attached to the inlet channel 6 and which is connected to the slide 20 (not shown in this figure) and the one air supply 42, comprises heating resistors 43 fed by a line 44 and a heating element 45, the two edges of the clothing are fused together by means of hot air, the heating element through the device 43 is supplied. the Welding is completed by the pressure of a roller 46.

All features mentioned in the preceding description and / or are shown in the drawing, provided that the known prior art this allows, on its own or in any combination or partial combination are regarded as essential to the invention, even if they are not in the claims are included.

Claims (16)

Patent claim Ö: Process for the continuous lining of pipelines, in particular heat-insulated pipelines, characterized in that one starts out from a Foil made of the material that is to form the clothing, with the foil as a roll is kept in stock that the roller is substantially perpendicular to the axis of the Pipeline arranges that you first roll off the film parallel to the pipeline lets them be directed towards the latter and lead them in such a way that that it progressively surrounds the pipeline to form a continuous one Tube, the edges of which are connected to each other parallel to the axis of the pipeline. 2) Method according to claim 1, characterized in that the Union of the edges of the foil covering the pipeline by welding or Gluing along a surface line, preferably the upper one, of the tube formed. 3) Method according to at least one of claims 1 and 2, characterized characterized in that a tape is applied over the connection of the edges of the film, that is attached by gluing or welding. 4) Method according to at least one of claims 1 to 3, characterized characterized in that one to facilitate the continuous control of the welded joint a self-adhesive metal strip under the foil near the part to be welded attaches. 5) Method according to at least one of claims 1 to 4, characterized characterized in that a plastic material is used as the material for clothing such as polyvinyl chloride, polyethylene or an elastomer such as butyl, polyurethane. 6) Method according to at least one of claims 1 to 5, characterized characterized in that one uses a material which is at ordinary temperature is relatively rigid and that one at the moment of use by heating softened. 7) Method according to at least one of claims 1 to 6, characterized characterized in that the thermal insulation on the pipeline immediately before the beginning of the turning over of the clothing film forms. 8) Method according to at least one of claims 1 to 7, characterized characterized in that the thermal insulation by means of strips, in particular made of glass fiber mats, forms, which are wound onto the pipeline in turns. 9) Method according to at least one of claims 1 to 8, characterized characterized in that the thermal insulation by means of shells made of insulating material executes. 10) Method according to at least one of claims 1 to 9, characterized characterized in that the thermal insulation is carried out in place on the pipeline is made by means of a cellular material, which by foaming an expandable Resin is obtained. 11) Method according to at least one of claims 1 to 10, characterized characterized in that the thermal insulation is carried out by foaming an expandable Resin inside the tube immediately after its manufacture. 12) Device for performing the method according to at least one of claims 1 to 11, characterized in that it has a slide (20), which moves along the pipeline to be covered (1) and which the roller (4) with the clothing material (3) and the organs for guiding (32, 33) of the film coming off the roll. 13) Device according to claim 12, characterized in that for guidance the film during the process of wrapping the pipeline (1) an organ in the form of a Inlet channel (6) is used. 14) Device according to at least one of claims 12 and thereby characterized in that the carriage (20) is provided with a rotating disc (28) is on which the rollers (29) are mounted with insulating tape (30), which are Wind around the pipeline (1) and at the same time use the thermal insulation (2) the formation of the clothing tube. 15) Device according to at least one of claims 12 to 14, characterized characterized in that the inlet channel (6) to form the clothing tube at the same time used to form thermal insulation by foaming an expandable resin is. 16) Device according to at least one of claims 12 to 15, characterized characterized in that a device (42, 43, 44, 45, 46 in Fig. 6) for connecting welding the edges of the cover sheet of the tube is firmly seated on the said carriage.