Facing the sleeve to the inner surface of the pipeline

 

(57) Abstract:

The sleeve is designed to protect the inner surface of the pipeline. The sleeve contains a concentrically arranged outer bag film shell, a reinforcing sheath and an inner tubular shell three-layer film. Reinforcing shell is from the inner lining thermoplastic layer, rigidly connected with a reinforcing membrane and serves as the inner surface of this shell. The side edges of the wrapper together with the side edges of thermoplastic layer are interconnected. Internal three-layer film bag shell is connected between a first outer layer containing thermoplastic polymer material polyamide adjacent to the inner surface of the reinforcing shell and is able to separate from the shell, the second intermediate layer in contact with the outer layer and containing a thermoplastic polymeric material is a polyamide or a polymeric adhesive based on polyamide, and a third inner layer in contact with the intermediate layer and containing a thermoplastic polymeric material blend of polyethylene with polypropylene. The technical result is Rotella, more precisely concerns facing the sleeve to the inner surface of the pipeline and can be used to protect the inner surface of the pipe against mechanical damage, corrosion or the formation of unwanted deposits.

There are various decorative sleeve for repair and strengthening of pipelines.

In particular, is known for facing the sleeve from the patent of the Russian Federation 2000513, F 16 L 58/02, 07 February 1993. The specified facing the sleeve contains a reinforcement impregnated with a binder material enclosed between the inner and outer sealed sleeves of synthetic film material. The inner and outer sealed sleeves are made of materials having a ratio of plastic strain (1.5-to 3.5):1 at a temperature of 60-80oWith and (1,5-5,0):1 at a temperature of 80-100oC.

The specified cladding sleeve has the following disadvantages. The inner sleeve in the heat treatment due to the slight melting must be attached to the inner surface of the pipeline, it is very likely that his detachment, which may result in the operation of the pipeline to its obstruction, filtration, and infiltration through the sleeve, and due to illicit antigenome invention is facing the sleeve to the inner surface of the pipeline, containing the outer bag film shell of thermoplastic polymeric material, a reinforcing sheath adjacent its outer surface to the inner surface of the outer film wrapper and impregnated cured binder, and the inner bag three layer of thermoplastic polymeric material film membrane, located on the inner surface of the reinforcing sheath (U.S. patent 5186987, F 16 L 55/162, February 16, 1993).

In the specified facing the reinforcing sleeve sheath consists of a fabric or Mat of fibers of high strength, soaked in thickened liquid termomaterialy resin for the formation of tissue-fiber-reinforced composite cladding sleeve having sufficient length and width greater than the length of the inner circumference of the processed pipe. The side edges of the shell slightly perelistyvat each other to form a tube around the inner tubular film. The inner bag film has: a) an outer layer that can easily be separated from the reinforcing shell and consisting of a biaxial oriented film of plastic, b) an intermediate layer consisting of a film of biaxially oriented plastic and flexible, selling an insignificant vapor permeability and resistance to heat to such an extent, that plastic does not melt and is not destroyed by steam.

This invention has the following disadvantages.

The inner layer is infusible film, in particular polypropylene, has a low ductility under the action of temperature, water vapor. In the internal heat of the self-heating reaction polypropylene softens, because the temperature of the highly plastic deformation of polypropylene 130oWith that much below the temperature of self-heating reactions (above 200oC). Due to the low elasticity of the inner layer is not stretched, defects occur, therefore, there is leakage of the lining sleeve.

The inner tubular sheath is made in connection together with layer-by-layer bonding and subsequent timosaponin ends. This process is unstable because of the place of gluing and welding defects occur that dramatically reduces the reliability of the sleeve as a whole.

Obtaining a thermoplastic inner layer for reinforcing the membrane by dissolving the plastic in the process of obtaining coverage is an unstable process, in which the probability of incomplete dissolution of the plastic and thus obtain a nonuniform coating.

Overlap the edges of the reinforcing sheath can result in their displacement during transportation in a pipeline and, consequently, loss of tubular form, because existing pipelines, especially gravity, have undocking, chips, dips, so when transporting reinforcing sheath on these defects meets resistance, which reduces quality of coating.

As can be seen from the above, all of these deficiencies generally lead to a deterioration of the quality of the coating.

The present invention was based on the task of creating such a lining sleeve to the inner surface of the pipeline, which would be designed in a way that would reduce the porosity of the resulting coating and improve its homogeneity, integrity and reliability, which would significantly improve the quality of the coating, which would, in turn, to a significant reduction of abrasive wear of the pipeline and increased throughput.

This is achieved by the fact that in facing the sleeve to the inner surface of the pipeline containing the external bag her surface to the inner surface of the outer film wrapper and impregnated cured binder, and the inner bag three layer of thermoplastic polymeric material film membrane, located on the inner surface of the reinforcing shell and is able to separate from the inner surface of the shell according to the invention a reinforcing shell is the inner sleeve three-layer film of a thermoplastic shell layer, is rigidly connected with a reinforcing membrane and serves as the inner surface of this shell, and the side edges of the wrapper together with the side edges of thermoplastic layer are connected, and the inner sleeve three-layer film shell is connected between a first outer layer containing thermoplastic polymer material polyamide 6, adjacent to the inner surface of the reinforcing shell and is able to separate from the shell, the second intermediate layer in contact with the outer layer and containing a thermoplastic polymeric material polyamide 12 or polymer adhesive based on polyamide, and a third inner layer in contact with the intermediate layer and containing a thermoplastic polymeric material blend of polyethylene with polypropylene, one of kotorye education molten phase fusible polymer - polyethylene, which is distributed among the defects of the intermediate layer, while the outer shell, a reinforcing shell and the inner shell concentrically located between them.

thermoplastic layer may contain polyurethane in the amount of 100 wt.%, or a mixture of polyurethane in an amount of 70-95 wt.% with the polyolefin in the number 30-5 wt.% or with a mixture of polyolefins in the number 30-5 wt.%, or a mixture of polyurethane in an amount of 70-95 wt.% with the polyester in the amount 30-5 wt.% or with a mixture of polyesters in the number 30-5 wt.%, or the polyolefin in the amount of 100 wt.% or a mixture of two polyolefins in the amount of 70-95 wt.% and 30-5 wt.% respectively, or polyester in the amount of 100 wt.% or a mixture of two polyesters in the amount of 70-95 wt.% and 30-5 wt.% respectively.

When the content of the polyurethane is less than 70 wt.% lost heat sleeve, thus decreasing the probability of obtaining a high-quality coating, and above 95 wt.% decreases the homogeneity and uniformity of application of polyurethane because of its mixture of polyolefin or mixture of polyolefins (polyolefin is a structural plasticizer) contributes to the process of applying a polyurethane in the form of a continuous web.

As for the mixture of polyurethane floor with the years of polyurethane above 95 wt.% reduced elasticity of the sleeve, consequently, the resulting coating.

It is quite possible that the inner layer of the inner shell contained a mixture of polyethylene in the amount of 20-40 wt.% with polypropylene number 80-60 wt.%.

The content of polyethylene is more than 40 wt.% reduces the internal resistance of the layer is less than 20 wt.% increases the rigidity of the layer.

All layers of the inner shell can be interconnected throughout the surface layers by melt.

The advantages of the present invention are as follows. The presence of the outer shell in contact with the defective pipe, prevents the penetration inside the uncured lining sleeve groundwater and thereby protects it from washing away uncured binder, the presence of water interferes with the curing process of the binder (water is an inhibitor of the curing process). The presence of the obtained thermoplastic coating in contact with the transported fluid, increases the tightness of the pipeline, improves throughput, prevent from abrasion.

Hereinafter the invention is explained in the description of specific examples of its implementation and the accompanying drawings, on which:
Fig.3 is the same as in Fig.1, on an enlarged scale.

The proposed facing the sleeve 1 (Fig.1 and 2) to the inner surface of the pipe 2 includes an external tubular film casing 3 of a thermoplastic polymer material, a reinforcing sheath 4 made of synthetic felt of polyester fibers, adjacent its outer surface to the inner surface of the outer film wrapper 3 and impregnated cured binder based on unsaturated polyester resin or epoxy resin, and the inner bag three layer of thermoplastic polymeric film material shell 5 button from the inner surface of the reinforcing shell 4 and is able to separate from the inner surface of the shell 5. Reinforcing the casing 4 (Fig.3) has the inner sleeve three-layer film of the shell 5 of thermoplastic layer 6, is rigidly connected with a reinforcing shell 4 and an employee of the inner surface of the lining 4. The side edges of the shell 4 together with the side edges of thermoplastic layer 6 are interconnected. Internal three-layer film bag, the shell 5 is connected between a first outer layer 7 containing in the quality of the glasses 4 and is able to separate from the shell 4, the second intermediate layer 8 in contact with the outer layer 7 and containing a thermoplastic polymeric material polyamide 12 or polymer adhesive based on polyamide, and a third inner layer 9 in contact with the intermediate layer 8 and containing a thermoplastic polymeric material blend of polyethylene with polypropylene, one of which is the heat treatment of polyethylene melts, and the other is polypropylene does not melt and is not destroyed, that promotes the formation of a molten phase fusible polymer is polyethylene, which is distributed among the defects of the intermediate layer 8. The outer shell 3, a reinforcing sheath 4 and the inner shell 5 are concentric with each other.

As thermoplastic polymeric material of the sheath 3 contains polyethylene in the amount of 100 wt.% or a mixture of polyethylene with polypropylene in an amount of 20-40 wt.% and 80-60 wt.% respectively.

thermoplastic layer 6 contains the polyurethane in the amount of 100 wt.%, or a mixture of polyurethane in an amount of 70-95 wt.% with the polyolefin in the number 30-5 wt. % or with a mixture of polyolefins in the number 30-5 wt.%, or a mixture of polyurethane in an amount of 70-95 wt.% with the polyester in the amount 30-5 wt.% or with smesto 70-95 wt.% and 30-5 wt.% accordingly, or polyester in the amount of 100 wt.%, or a mixture of two polyesters in the amount of 70-95 wt.% and 30-5 wt.% respectively.

The inner layer 9 of the inner shell 5 comprises a mixture of polyethylene in the amount of 20-40 wt.% with polypropylene number 80-60 wt.%.

As the polyolefin in the blend with polyurethane can be used polyethylene, Sevilen, and as polyolefins separately - polyethylene, Sevilen and mixed with additives, polypropylene, polyvinyl chloride.

If the limit polyolefin is more than 70 wt.%, then we have the difficulty of obtaining uniform distribution, if greater than 95 wt.%, for polypropylene increases rigidity for Sevilen, polyethylene and polyvinyl chloride reduces the heat resistance.

As polyesters it is possible to use thermoplastic elastomers - definiltely, the best choice or polybutylene terephthalate.

All of the layers 7, 8, 9 of the inner shell 5 are connected across the surface layers by melt.

The method of applying the proposed lining of the sleeves on the inner surface of the pipeline is as follows.

Facing the sleeve 1 (Fig.3) containing bag 3 external and 5 internal three-layer coating on the cured binder, injected into the pipeline 2, and then produce the flow inside the lining sleeve 1 under pressure of 0.1-0.3 ATM compressed air or water to fit (hereinafter pressure fit) sleeve 1, the internal surface of the pipeline 2, produce a supply of pressure fluid, and conducting heat treatment to cure the binder in the following modes:

- coolant - saturated water steam or hot water;

- coolant temperature - 80-100oC;

- pressure - 0.1 to 0.6 MPa;

the time of heat treatment - 2-15 hours.

Then, after heat treatment to produce the cooling sleeve with cooling rate of 10-20oWith/hour.

Then remove the inner shell 5 and receive a coating of the inner surface of the pipeline 2.

Below will be described in detail specific examples of the proposed cladding sleeves.

Example 1.

Facing the sleeve 1 (Fig.1 and 2) to the inner surface of the pipe 2 includes an external tubular film casing 3 made of polyethylene in the amount of 100 wt. %, reinforcing the shell 4 made of synthetic felt of polyester fibers, adjacent its outer surface to the inner surface of the outer planoconcave three-layer film membrane 5, located by the inner surface of the reinforcing shell 4 and is able to separate from the inner surface of the shell 5. Reinforcing the casing 4 (Fig.3) has the inner sleeve three-layer film of the shell 5 of thermoplastic layer 6 containing polyurethane in the amount of 100 wt.%, rigidly connected with a reinforcing shell 4 and an employee of the inner surface of the lining 4. The side edges of the shell 4 together with the side edges of thermoplastic layer 6 are interconnected. Internal three-layer film bag, the shell 5 is connected between a first outer layer 7 containing polyamide 6 in the amount of 100 wt.%, adjacent to the inner surface of the reinforcing shell 4 and is able to separate from the shell 4, the second intermediate layer 8 in contact with the outer layer 7 and containing polyamide 12 in the amount of 100 wt. percent, and a third inner layer 9 in contact with the intermediate layer 8 and containing a mixture of polyethylene with polypropylene in an amount of 20 wt. % and 80 wt.% accordingly, one of which is the heat treatment of polyethylene melts, and the other is polypropylene does not melt and is not destroyed, that promotes the formation of a molten phase fusible polymer - p the points 4 and the inner shell 5 are concentric with each other. All of the layers 7, 8, 9 are interconnected over the entire surface by the melt.

The method of application is that of facing the sleeve 1 (Fig.3) containing 3 external and 5 internal three-layer shell, between which is placed a reinforcing sheath 4, impregnated cured binder based on unsaturated polyester resin, is injected into the pipeline 2, and then produce the flow inside the lining sleeve 1 pressure fit of 0.3 ATM compressed air to fit the sleeve 1 of the internal surface of the pipeline 2, produce a supply of pressure fluid, and conducting heat treatment to cure the binder in the following modes:

- coolant - saturated water vapor;

- coolant temperature - 100oC;

pressure of 0.6 ATM;

the heat treatment time is 15 hours.

Then produce a cooling sleeve with cooling rate of the 20oWith/hour.

Then remove the inner shell 5 and get coverage.

In the inside of the pipe 2 is formed cured plastic shell containing an inner sealed thermoplastic layer, resulting in a gain of coverage high quality.

All ngeap is the iMER 1. The difference will be only in the materials and their quantities shell 3, thermoplastic layer 6, the intermediate 8 and 9 internal layers of the shell 5, the types of fluid modes of curing and cooling, which are summarized in the following table. The results obtained are the same as in example 1.

Thus, the proposed cladding sleeve provides receive coverage of high quality, because the inner surface of the cover has a rugged thermoplastic layer that reduces abrasion, increases the throughput of the pipeline.

1. Facing the sleeve to the inner surface of the pipeline containing the outer bag film shell of thermoplastic polymeric material, a reinforcing sheath adjacent its outer surface to the inner surface of the outer film wrapper and impregnated cured binder, and the inner bag three layer of thermoplastic polymeric material film membrane, located on the inner surface of the reinforcing shell and is able to separate from the inner surface of the shell, characterized in that the reinforcing sheath is from inside the sandwich bag is the surface of the shell, and the side edges of the wrapper together with the side edges of thermoplastic layer are connected, and the inner sleeve three-layer film shell is connected between a first outer layer containing thermoplastic polymer material polyamide adjacent to the inner surface of the reinforcing shell and is able to separate from the shell, the second intermediate layer in contact with the outer layer and containing a thermoplastic polymeric material is a polyamide or a polymeric adhesive based on polyamide, and a third inner layer in contact with the intermediate layer and containing a thermoplastic polymeric material blend of polyethylene with polypropylene, one of which is a polyethylene - when the heat treatment is melted, and the other - polypropylene - does not melt and is not destroyed, that promotes the formation of a molten phase fusible polymer is polyethylene, which is distributed among the defects of the intermediate layer, while the outer shell, a reinforcing shell and the inner shell concentrically located between them.

2. Facing the sleeve under item 1, characterized in that thermoplastic layer contains polyurethane in amounts of the olefins in the number 30-5 wt. %, or a mixture of polyurethane in an amount of 70-95 wt. % with polyester in the amount 30-5 wt. % or with a mixture of polyesters in the number 30-5 wt. % or polyolefin in the amount of 100 wt. % or a mixture of two polyolefins in the amount of 70-95 wt. % 30-5 wt. % respectively, or polyester in the amount of 100 wt. % or a mixture of two polyesters in the amount of 70-95 wt. % 30-5 wt. % respectively.

3. Facing the sleeve under item 1 or 2, characterized in that the inner layer of the inner shell contains a blend of polyethylene with polypropylene in an amount of 20-40 wt. % 80-60 wt. % respectively.

4. Facing the sleeve according to any one of paragraphs. 1-3, characterized in that all layers of the inner shell are connected across the surface layers by melt.

 

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