Procedure for application of insulating collar on pipe coupling

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.

11 cl

 

The invention relates to the field of corrosion protection of metal surfaces of pipelines intended for transportation of liquid and gaseous media in their construction and repair, and can be used to isolate the metal surfaces of pipelines from the combined action of moisture and oxygen.

Welded joints are one of the most important nodes in the operation of any pipeline. Therefore, when the insulation joints, special attention should be paid not only to the materials used, but also to the quality of application of these materials, strict compliance process procedures applying existing norms and standards.

It should be noted that technological regulations applying cuffs of different manufacturers are very different from each other and thus require constant adaptation of the working staff, difficult to control, first of all, the temperature settings of the heating tubes and cuffs, enough of ethnologica require very high qualifications insulating crews and long-term training of workers.

Given that work on applying the cuff on the road to perform in difficult climatic conditions (low temperature, wind, precipitation), are not always highly qualified workers, often low culture - when the check result is tov application cuffs bodies Supervisory organizations culling cuffs demanding their replacement. Besides that cuff is an expensive material, replacement cuffs strongly influences the increase in the period of the start of the pipeline into operation, resulting in huge losses operating organizations.

Known (RU, patent 2230878) method of isolation of pipelines welded joints of steel pipes lined with polyethylene, comprising applying to the location of the weld heat-shrink tape and heat treatment of the obtained compound with a naked flame, and before applying the heat shrink tape on the weld bead is applied polymer tape having an adhesive layer and providing adhesive connection with the metal pipe, remove moisture from the surface of the polymeric ribbon heating, open flame, heat shrinkable tape is applied on the polymer tape with overlap and accommodation space overlap on the lateral surface of the pipeline, compresses the compound obtained by heating lead an open flame, first the bottom, then top, then on the side surface on the opposite side from overlapping and complete heating of the places of overlap.

Also known (RU, patent 2228940) method of anti-corrosion insulation of welded joints and pipeline repair by applying a heat-shrinkable multilayer adhesive tape containing a protective layer of plastic tape electro-chemically modified to absorption is possible doses of 25 to 50 Mrad and oriented in a shared direction for 25-75%, and the adhesive layer on the basis of a copolymer of ethylene with additives inorganic filler and modifier moreover, before applying a multilayer adhesive tape is applied epoxy composition, with the adhesive layer of the tape contains as a modifier of the polyisocyanate, and a copolymer of ethylene and a copolymer of ethylene with vinyl acetate (I) and a copolymer of ethylene with vinyl acetate (II), with the difference in the content of the vinyl acetate groups, equal to 5-20%, and the copolymer of ethylene with vinyl acetate (III) with the content of 27-30% of vinyl acetate groups and a melt flow index of 15-30 g/10 min, in the following ratio, wt.%:

A copolymer of ethylene with vinyl acetate (I)19-57
A copolymer of ethylene with vinyl acetate (II)57-19
A copolymer of ethylene with vinyl acetate (III)4-15
Inorganic filler8-17
Modifier - the polyisocyanate1-3

The closest analogue developed technical solutions can be recognized (guidance document. Instructions for the protection of urban underground pipelines from corrosion. RD 153-39.4-091-01. - M.: the 4th branch Books, 2002, p.26-28) the method of applying a joint of pipe in trasco what's the conditions of the cuff of the heat-shrinkable tape with the use of special equipment and devices (sandblasting or sander, gas cylinders with burners, stitcher rollers and others).

When implementing the known method for isolation joints can be used for domestic heat-shrinkable tape Conrad-ST2 (TU 2245-004-46541379-97), DRL-ST2 (TU 2245-001-31673075-97), Therma-ST (THE 2245-002-44271562-00), LTA (TU RB 03230835-005-98), and heat-shrinkable tape company Raychem class not below with50. The thickness of the heat-shrinkable tape shall be not less than 1.8 mm, With insulation of welded joints of heat-shrinkable tapes by a known method sequentially perform the following operations:

- pre-heating and drying of the seal (if necessary);

- cleaning the weld zone on the sander or sand blasting apparatus;

- the formation of the cuff and ribbon;

application and shrinkage cuffs and heating of the junction.

For the formation of the cuff heat-shrinkable tape is used for insulation of welded joints of pipes, cut so that it overlaps on the factory insulation coating was not less than 70 mm, and the length corresponds to the length of the circumference of the pipe plus 20% of the length of the heat shrink material, plus 100 mm overlap when forming the cuff. The formation of the ribbon ring cuff carried out directly on the pipe near the joint. The blank tape on Flex ring around the welded joint of pipe. The magnitude of overlap of the tape to which GNA be not less than 100 mm Under the cuff in place of overlapping tape put a strip of heat-resistant material (PTFE). Then, using manual gas burner heats up the adhesive sublayer ribbons in place of overlapping to form a melt, and then manually applying the packer roller to produce a seal seat lap belt. As the cooling of the melt is used for bonding tape and the formation of circular cuff.

Prepared cuff leave near the zone of the welded joint of the pipeline until then, until you warm up the joint to the required temperature. Heating of the weld zone to the desired temperature (130-140°C) is produced by the manual gas burners of different designs. Gas burner should provide torch mecoptera flame length not less than 300 mm and width up to 100 mm, the temperature Control of the interface at different points in the exercise trial contact strips of tape applied to the surface of the hot junction of a glue layer. If a glue layer of the tape in contact with the metal of the pipe quickly melts and adheres to the steel surface, the junction temperature sufficient for formation of a coating of heat-shrinkable tape. Region adjacent to the junction of the coating must also be heated with a soft flame burner to 90-100°C., the polyethylene may slightly soften the Xia. After heating the insulated zone to the desired temperature termophilous cuff set in place of the welded joint. The magnitude of overlap cuff on the factory floor pipes shall be not less than 70 mm on both sides of the welded joint. The process thermocontracting cuff start with its fixation on the zone of the welded joint. This is implemented by uniform heating of the Central part of the cuff around the perimeter, resulting in the sleeve shrinks and is fixed on the pipe. To ensure uniform shrinkage of the material and prevent welding of cuff to top of pipe at the beginning of the process of shrinkage between the cuff and the tube on both sides of the cuff install resilient annular gasket thickness of 10-15 mm After fastening cuffs on the isolated section of the pipeline laying out and produce heating and shrinkage of the entire cuff. The process of shrinking lead from the center of the cuff to the edges. At the same time to ensure maximum adhesive contact between the cuff and the insulated section of the pipe should not be allowed education under floor air bubbles, folds. Seal, alignment, coating can be performed manually (using gloves), the compression elastic roller, a plate with a soft, elastic gasket and other

Heat-shrinkable sleeve shall PLO is but without bumps and folds to fit insulated pipeline section with the exit roller melt adhesive sublayer tape from under the cuff on the factory floor.

The disadvantage of this method should be recognized:

1. To ensure the polymerization of the (melting) of the adhesive layer should the tube be heated to 110-130°C, which often leads to disruption of the coating base isolation due to the formation between the plant floor and the pipe of the air gap. When applying the cuff and its shrinkage is further heated by the burner flame, resulting in increasing isolated volumes of air lead to extensive delamination of the coating;

2. Forced overheating of the pipe leads to thermo-oxidative degradation previously applied epoxy primer and magazinnogo layer;

3. Due to uneven shrinkage of the cuff between the pipe and flange are formed of air sinuses, buckles, hip area, which is hard to overcome. These activities spent a lot of time, in addition to lowering the temperature of the pipe and increases the risk of not having a strong adhesive connection.

4. High probability of degradation of polymers overheating causes to work with the shrinkage of the cuff in the field of low temperatures at which it is almost impossible to check guaranteed splavlenie adhesive layer at each point of the cuff, as well as the presence of micro volumes of air.

5. On heating pipes from 40-50°C to 110-130°C spent a lot of time and energy, and it is the rate of production operations and cost savings on labor and materials.

The technical problem to be solved by the proposed technical solution is to develop a method of applying a cuff at the junction of the pipeline using a small heating and high adhesion with a significant improvement of the corrosion characteristics of the coating and, consequently, reducing the cost of planned major repair metal surface by increasing its service life.

The technical result obtained by the implementation of the method is to improve the adhesion of the insulating cuff to the surface of the joint of pipe with an additional increase in the period between repairs on perezalivayu joint pipeline.

To achieve the technical result of the proposed use, a method of applying an insulating cuff at the junction of the pipeline. According to the developed method are preparing a surface of an insulated joint, put on the prepared surface of the roll of adhesive material, heat it up to soften, wet layer of adhesive material is placed piece of heat-shrinkable polymeric tape, with denaut overlap the ends of the heat-shrinkable polymeric tape with the formation of the cuff, at the junction of the ends of the install locking plate and hold termowizyjne cuffs.

Preparation of the interface depends on the conditions of deposition of the insulating cuff. Clearance is produced preferably by mechanical means - blasting or shot-blasting, mechanical polishing, etc. to remove metal oxides, inhomogeneities, burrs, etc. If necessary, in the case of cooling surface, it is necessary to heat the surface to the dew point and, if necessary, be applied on the surface of the junction layer of primer.

After the surface preparation of the joint of pipe to the prepared place put a roll of adhesive material that can be made on the basis of a copolymer of ethylene and vinyl acetate (Sevillana). Caused to roll the adhesive material is preferably heated by a gas flame to a temperature not higher than 70°C. the Heated layer of the roll of adhesive material, if necessary with known methods smooth the surface of the joint, ensuring the filling of all the irregularities in the surface, while removing any known way any air trapped between the roll of adhesive material and interface.

On a heated roll of adhesive material applied heat-shrinkable polymeric films, Abramenko the in side of the interface, surface of which is preferably further comprises a layer of adhesive with a thickness of 300 μm. Applied tape also smooth, removing any known way any air trapped between the polymer tape and a roll of adhesive material. To snap the cuffs to the ring the layer of primer is additionally heated before application to the interface, mainly to a temperature of 70°C.

Mostly use heat-shrinkable polymeric films made on the basis of polyethylene or polypropylene. However, it is possible to use other bases, providing the shrinkage of the material when heated preferably at a temperature of 90-150°C.

In the baseline method is used as follows.

The cuff is made from a polymeric heat-shrinkable tape, which is designed for corrosion protection of welded joints of pipe together with the adhesive layer - primer. When mounting the heat-shrinkable sleeve is applied over the epoxy primer. In addition to this polymer heat-shrinkable tape for forming the cuff must be used two-component epoxy or epoxy-polymer one-component primer. Used heat shrink tape should have two layers: the layer of radiation-modified polymer and thermoplastic layer is DHESIVE thickness of 250-300 μm. The supply of tape is carried rolls or in the form of segments per joint. In addition, you must use a layer of thermoplastic adhesive in the form of a tape thickness of 1.2-1.5 mm, you Must also use the standard locking plate, which is designed to snap tape in the ring on the spot welded joint.

To create a cuff, you must use the following equipment:

gas burner (2 pieces);

propane tank, equipped with a gearbox (2 pieces);

connecting the gas hose 10 m (2 pieces);

contact thermometer (pyrometer) with a range from 0 to 150°C;

silicone heat resistant packer rollers;

heat-resistant gloves, mittens;

spatulas for mixing the components of the primer;

foam rollers to apply primer on the insulated surface of the welded joint.

When you isolate the junction of the pre-carry out a preliminary mechanical cleaning of the surface of the joint. With the interface you want to delete, using a grinding machine or a file, burrs, and sharp edges grata. Then carry out a heat pipe gas burners to a temperature of 50-60°C to remove condensation (dew point), and then final clean interface. In particular, using sandblasting installation, you must process the steel is again the pipe before purification least 2 according to GOST 9.402-80. After processing steel pipe should have a light grey color with no trace of rust and scale. For pipes with diameter of up to 325 mm inclusive Pets to clean the surface to use a grinding machine, with careful control of the degree of purification. The steel surface of the welded joint should not be bold (if present on the pipe oil stains must be removed with a rag dampened with mineral spirits or other solvent)should not be dusty (dust should be removed with a dry cloth). To ensure the quality of the shrinkage of the polymer coating, it is necessary to smooth out the rough edges of the factory coating. Edge of the base polymer insulation at a distance of 100 mm from the edge (on both sides of the weld) should not be bold (if present on the pipe oil stains must be removed with a rag dampened with mineral spirits or other solvent)should not be dusty (dust should be removed with a dry cloth) and should have roughness.

For the preparation of the primer you need to open the lid of the containers with the components of the primer, to heat these capacity components to a temperature of not more than 20±5°C and mix the components until a homogeneous mixture.

In the case of lowering the temperature of the pipeline after its preparation to 25-30°C, heat it to a temperature of about 50°C. On Ernest pipe after heating must be free of soot, what is achieved by adjusting the burners.

The mixture of primer unloaded from the vessel to the pipe section and put the mixture in an even layer thickness of about 100-200 μm on the surface preheated to a temperature of about 50°C. Temperature praimirovanie steel surface after curing of the primer should be in the range of 40±5°C and must not decrease during the mounting of the cuff.

For the preparation of the cuff is initially necessary for the width of the tape of thermoplastic adhesive trim 2 angle with dimensions of 50 mm in width and 15 mm length of the tape so that the edge of the cuff was narrowed in the form of a trapezoid. If the tape comes in a roll, it is necessary to cut the required size of the tape in accordance with the recommendations. Then, you must wrap the prepared strip of thermoplastic adhesive around the pipe (the overlap of the tape shall be not less than 100 mm and positioned above and to one side of the pipe). The width of the adhesive layer should overlap the factory floor on both sides of the weld is not less than 75 mm Uniformly heated with a soft flame burner adhesion layer, starting from the place of overlapping and preventing it from overheating. Under the action of the flame of the burner cover should go to a plastic state, formed on the tube monolithic structure with no air bubbles, cracks, bumps and prop the SKOV coverage. Directly on the applied adhesive layer is applied the actual cuff wrap around the tube of heat-shrinkable polymeric tapes polymer layer top (lap belt shall be not less than 100 mm and positioned above and to one side of the pipe). Side of the tape adhesive with cut corners is located at the bottom of the overlap, the width of the tape should overlap the factory floor on both sides of the weld is not less than 75 mm At the contact of the thin adhesive layer on the cuff (250 μm) and previously applied adhesive layer is formed of a homogeneous layer. Heated by the burner flame inner adhesion layer edge cuffs in place of overlap (without overheating and shrinkage of the polymer) and press the edge of the cuff, using a roller or heat-resistant gloves. Locking plate installed in place of overlapping heat-shrinkable cuff polyethylene layer to the top and the middle of the overlap should be in the middle of the locking plate. Before installing the locking plate heat of her inner adhesion layer under the insulation. Then locking plate is placed on the overlap and produce heating of the yellow flame of the burner and simultaneously compacting using silicone packer roller before the performance contours overlap and the protrusion on the edges of the locking plate adhesive (melt adhesive SL is I lock plate). Next, you need to make the final rolling locking plate roller or a heat resistant glove to remove bubbles and bumps.

The shrinking cuffs should start after the installation of the locking plate. Termowizyjne cuff produce a soft gas flame. The shrinking cuffs produce from the line of the weld first one side, then from the line of the weld to the other side. The shrinking cuffs provide movement of the burners on the diameter of the pipe without heating the castle of the tape. In the case of formation of bubbles and bumps they should razglazhivaetsya packer heat-resistant roller or heat-resistant gloves.

If necessary (to avoid the situation, when the adhesive layer is not brought to a plastic state, and due to accidental overheating - up to yield stress) after application of the primer (primer) joint pre-wrap reinforcing material (e.g. glass fiber SST-B-Transit), and then applied to the adhesive layer.

If necessary (to avoid the situation, when the adhesive layer is not brought to a plastic state, and due to accidental overheating - up to yield stress) may use adhesive, reinforced, for example, glass fiber SST-B-Transit.

In particular, when using a two-layer thermoplastic Le is you type "NRL-ST" 450×2.4 THE 2293-001-29200582-02 together with epoxy primer "EAF" TO-003-29200582-2007 on the segment of the pipeline resulting homogeneous quality insulation coating with tensile strength not less than 26 MPa and strength adhesive joint with steel in the preliminary praimirovanie 70-75 N/cm (respectively, for the prototype method 12 MPa and 35-50 N/cm).

1. The method of applying insulating cuffs on the seam of the pipe, characterized in that the conducting surface of the insulated joint, put on the prepared surface of the roll of adhesive material, heat it up to soften, wet layer of adhesive material is placed piece of heat-shrinkable polymeric tape, connect the overlapping ends of the heat-shrinkable polymeric tape with the formation of the cuff, at the junction of the ends of the install locking plate and hold termowizyjne cuffs.

2. The method according to claim 1, characterized in that in the preparation of the surface of the insulated joint is heated it for condensate removal.

3. The method according to claim 1, characterized in that in the preparation of the surface of the insulated joint is removed from the surface contamination and irregularities.

4. The method according to claim 3, characterized in that in the preparation of the surface of the insulated joint optionally after removal of surface contaminants and irregularities heat the surface of the insulated joint for condensate removal.

5. The method according to claim 3, characterized in that in the preparation of the surface of the insulated joint after removal from the surface of the junction of the dirt and irregularities nano is Yat layer of primer.

6. The method according to claim 1, characterized in that the deposited layer is caused to roll the adhesive material is heated to the temperature of the transition into a plastic state.

7. The method according to claim 1, characterized in that the use of heat-shrinkable polymeric films facing interface surface which further comprises a layer of adhesive with a thickness of 300 μm.

8. The method according to claim 7, characterized in that the adhesive layer is additionally heated before application to the interface.

9. The method according to claim 1, characterized in that the use of heat-shrinkable polymeric films based on polyethylene.

10. The method according to claim 1, characterized in that the use of heat-shrinkable polymeric films based on polypropylene.

11. The method according to claim 1, characterized in that termowizyjne polymer tape is carried out at a temperature of 90-150°C.



 

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1 cl, 3 ex

FIELD: construction of conveyance pipelines used in sanitary engineering systems.

SUBSTANCE: flexible plastic extrusion profile has plastic sleeve which gives the impression of painting and/or metal plating. Method involves applying onto outer side of flexible plastic extrusion profile, in particular, plastic sleeve a system of layers including internal layer giving the impression of thin metal layer, and external at least partly transparent protective covering layer. Described in Specification are methods of applying said layers, their parameters and properties.

EFFECT: wider range of technical means.

39 cl, 4 dwg

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