CN113531228A - Anti-corrosion heat-insulation ground pipeline welding structure and welding method - Google Patents
Anti-corrosion heat-insulation ground pipeline welding structure and welding method Download PDFInfo
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- CN113531228A CN113531228A CN202110975984.5A CN202110975984A CN113531228A CN 113531228 A CN113531228 A CN 113531228A CN 202110975984 A CN202110975984 A CN 202110975984A CN 113531228 A CN113531228 A CN 113531228A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L9/00—Rigid pipes
- F16L9/14—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups
- F16L9/147—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups comprising only layers of metal and plastics with or without reinforcement
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L13/00—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints
- F16L13/02—Welded joints
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
- F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
- F16L58/04—Coatings characterised by the materials used
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Abstract
The invention relates to an anti-corrosion heat-preservation ground pipeline welding structure and a welding method, and the anti-corrosion heat-preservation ground pipeline welding structure comprises a liner pipe end surface straight section and a second steel pipe, wherein an end part anti-corrosion layer is arranged on the right side of the liner pipe end surface straight section, a ladder-shaped groove is formed in the right side of the end part anti-corrosion layer, a connecting sleeve is arranged outside the ladder-shaped groove, the upper end of the connecting sleeve is provided with the first steel pipe, the right side of the connecting sleeve is provided with a vacuum layer, and the second steel pipe is located at the lower end of a supporting sleeve. The invention has the beneficial effects that: the welding structure and the welding method of the anti-corrosion heat-preservation ground pipeline have the advantages that the straight section of the end part of the lining pipe in the double-layer pipe is welded into a whole by plastic hot melting in a butt joint mode, the two ends of the outer wall of the first steel pipe are welded into a whole by the welding sleeve, the anti-corrosion heat-preservation ground pipeline welding structure is formed, the welding opening of the lining pipe is seamless and free of leakage points, the welding opening of the outer welding sleeve is arranged on the vacuum layer at the two pipe ends, the vacuum layer blocks the damage of high-temperature electric welding on the lining pipe in welding, the inner anti-corrosion layer is as new after the inner hole of the welding opening is welded, the opening repairing treatment of the inner anti-corrosion layer is not needed, the all-dimensional anti-corrosion effect is achieved, the vacuum layer plays a heat preservation effect, and the static temperature of the steel pipe with the same diameter is increased by 22-25 ℃.
Description
Technical Field
The invention relates to the technical field of anti-corrosion heat-insulation ground pipelines, in particular to a welding structure and a welding method of an anti-corrosion heat-insulation ground pipeline.
Background
At present, the crude oil transportation from an oil production well to a metering room, a metering room to a combined station, a combined station to an oil refinery and a wharf in China is basically carried out by adopting pipelines. The oil pipeline has the characteristics of large transportation volume, good sealing property, low cost, high safety factor and the like. The connecting mode of the pipelines mainly comprises three types of screw thread, welding and flange connection, most of the pipelines are connected by adopting a welding method, the welding method has the advantages of convenient construction, firmness, tightness, steel saving and the like, and China has hundreds of thousands of oil wells and hundreds of thousands of kilometers of oil pipelines (pipelines and pipelines). However, corrosion waxing and perforation are critical factors affecting the reliability and service life of the piping system. The corrosion perforation happens 1-2 years after the underground oil and gas pipeline of China is put into production, according to statistics, the Daqing oil field can build various pipelines 10 thousands kilometers more and the oil extraction of the Daqing oil field six factories can perforate 7000 times in 2018 years, the corrosion perforation at the welded junction accounts for more than 70%, and the annual failure rate of the pipeline of the Daqing oil field in 2019 is 0.461 times/kilometer year. Causing huge economic loss and environmental pollution to the oil field.
At present, crude oil with high viscosity and easy coagulation in China accounts for more than 80% of crude oil produced in China, and particularly, oil products with high coagulation point, high wax content, high viscosity and high yield (for example, the suspected point of crude oil in Daqing oil fields is as high as 32 ℃) are poor in fluidity at normal temperature, a heating and conveying process is mainly adopted in the prior art, and a heating station is arranged along a pipeline at intervals of dozens of kilometers. The disadvantages of the method are high oil transportation energy consumption, small allowable variation range of transportation quantity, and serious pipeline blockage accidents caused by condensation due to overlarge crude oil temperature drop when the pipeline is shut down for too long time. The long-distance oil pipeline in China consumes dozens of thousands of tons of fuel oil for heating every year, so the problems of energy conservation and safe transportation of the high-viscosity and easily-condensable crude oil are one of the main technical problems in the field of petroleum storage and transportation in China.
The existing welding pipeline is two-pipe butt welding, the high temperature of the welding opening damages an anticorrosive coating on the inner wall of the welding opening, a good repairing anticorrosive coating such as a new technology for an inner hole of the welding opening does not exist at present, the anticorrosive coating in the oil pipeline in China mostly adopts an epoxy powder coating anticorrosive technology at present, the defect of the technology is that air is used as a carrier, and trace air or volatile is sealed in the coating after the solidification is fast carried out, or the coating is broken to form pores. Excessive holes can absorb moisture and diffuse along the interface, the binding force between the dissipation coating and a steel substrate can be dissipated, delamination and stripping can be caused seriously, the wall thickness of the solid epoxy powder anti-corrosion coating is only dozens of microns, the surface is rough, the friction coefficient is large, the coating disappears completely in a short time in the flowing speed scouring process of high-pressure liquid, and long-acting anti-corrosion use cannot be realized.
Therefore, it is necessary to design a welding structure and a welding method for an anti-corrosion and heat-insulation ground pipeline in order to solve the above problems.
Disclosure of Invention
The invention aims to provide an anti-corrosion heat-preservation ground pipeline welding structure and a welding method, aiming at solving the problems that the welding pipeline is provided in the background technology, two pipes are welded in an opposite port mode, the anti-corrosion layer on the inner wall of a welding port is damaged due to high temperature at the welding port, no good repairing anti-corrosion layer such as a new technology exists at present in the welding port, the anti-corrosion layer in the oil pipeline in China mostly adopts an epoxy powder coating anti-corrosion technology, and the anti-corrosion structure has the defects that air is used as a carrier, and trace air or volatile matters are sealed in a coating layer after the solidification is carried out rapidly after a film is formed, or the coating layer is broken to form pores. Excessive pore space can absorb moisture to along interface diffusion, the cohesion of dissipation coating and steel substrate, serious can lead to the delaminating to peel off, solid-state epoxy powder anticorrosive coating wall thickness is only tens microns, and the surface is coarse, and coefficient of friction is big, disappears in the short time of high-pressure liquid velocity of flow scouring in-process and loses completely, does not play the long-term problem of anticorrosive use.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides an anticorrosive heat preservation ground pipeline welded structure and welding method, includes interior bushing pipe terminal surface straight section and second steel pipe, the right side of interior bushing pipe terminal surface straight section is provided with the tip anticorrosive coating, and the right side of tip anticorrosive coating is provided with trapezoidal groove, the outside in trapezoidal groove is provided with the adapter sleeve, and the upper end of adapter sleeve is provided with first steel pipe, the right side of adapter sleeve is provided with the vacuum layer, and the right side on vacuum layer is provided with the supporting sleeve, the second steel pipe is located the lower extreme of supporting sleeve adapter sleeve, and the lower extreme of second steel pipe is provided with interior village pipe, the outside of first steel pipe has set gradually outer anticorrosive coating and welding sleeve from a left side to the right side, welding sleeve's inboard lower extreme is provided with the plastic welding seam, and welding sleeve's both ends are provided with the weld seam about and.
Preferably, the method for welding the corrosion-resistant heat-insulation ground pipeline comprises the following steps: A. selecting a steel pipe; B. manufacturing a double-layer vacuum steel pipe; C. manufacturing a lining plastic pipe; D. coating an anticorrosive heat-insulating layer on the outer wall of the double-layer vacuum steel pipe in a hot melting way; E. forming the double-layer vacuum heat-preservation steel-plastic composite oil pipe; F. installing a welding sleeve; G. welding; H. manufacturing a welding structure of the anti-corrosion heat-insulation ground pipeline; I. finishing connection;
a, selecting steel pipes: selecting a first steel pipe and a second steel pipe, wherein the lengths of the two pipes are the same, the wall thickness of the first steel pipe is larger than that of the second steel pipe, the wall thickness uses the outer diameter of the first steel pipe as a reference, the wall thickness of the pipe is large, the wall thickness is thin if the pipe diameter is small, the outer diameter of the second steel pipe is smaller than the inner diameter of the first steel pipe by 6-20mm and is a vacuum layer, the size of the vacuum layer uses the inner diameter of the first steel pipe as a reference, the diameter is large, the vacuum layer is large if the diameter is large, the vacuum layer is small if the diameter is small, the first steel pipe is executed according to an oil pipe execution standard, and the second steel pipe is executed according to a ground pipeline standard.
Preferably, b. manufacturing a double-layer vacuum steel pipe: the connecting sleeves and the middle supporting sleeves are arranged on the outer wall of the second steel pipe at equal intervals, the connecting sleeves at two ends and the middle supporting sleeves are welded on the outer wall of the second steel pipe by using an electric resistance welding process, the second steel pipe penetrates into an inner hole of the first steel pipe, the two ends are aligned, the lengths are the same, and the first steel pipe and the second steel pipe are welded into a whole by using a vacuum seal welding process.
Preferably, c. manufacturing a lining plastic pipe: modifying and granulating a selected PP-PE plastic raw material by using a parallel double-screw granulator, wherein the modified PP-PE plastic raw material has memory property and elastoplasticity, processing an inner village pipe by using a plastic extruder vacuum forming process, wherein the outer diameter of the inner village pipe is 1-3mm larger than the inner diameter of a second steel pipe, performing sand blasting, rust removing and shot blasting treatment on the inner wall of a double-layer vacuum steel pipe to reach the Sa2.5-level standard, penetrating the prefabricated inner village pipe into an inner hole of the second steel pipe while reducing the diameter of the prefabricated inner village pipe by using a reducing machine, respectively growing 200mm and 250mm of second steel pipes at two ends of the inner village pipe, adjusting the length, standing at normal temperature for 72-120 hours after penetrating the inner village pipe, and naturally rebounding the outer wall of the inner village pipe to tightly abut against the inner wall of the second steel pipe to form an inner anticorrosive layer.
Preferably, D, coating an anti-corrosion heat-insulation layer on the outer wall of the double-layer vacuum steel pipe by hot melting: carrying out sand blasting and rust removing treatment on the outer wall of the double-layer vacuum steel pipe to reach the Sa2.5-level standard, carrying out intermediate frequency heating on the double-layer vacuum steel pipe during transmission and walking by using a transmission roller, enabling the steel pipe subjected to intermediate frequency heating to enter an inner hole of a right-angle machine head of an extruder at a constant speed, coating the outer wall with an outer anti-corrosion layer, cooling the moving part when the steel pipe coated with the outer anti-corrosion layer moves out of the machine head by 100 mm and 200mm, and cooling to room temperature, thus finishing the processing of the double-layer vacuum steel-plastic composite oil pipe with the plastic lining pipe and the outer wall hot-melting coated with the outer anti-corrosion layer.
Preferably, E, forming the double-layer vacuum heat-preservation steel-plastic composite oil pipe: cutting the two ends of the interior village pipe to expose 25-30mm of the end part of the second steel pipe, adjusting the wall thickness of the double-layer steel pipe, heating the interior village pipe exposed out of the two ends of the second steel pipe to a melting temperature, and molding the interior village pipe into the trapezoid groove at the end part of the double-layer steel pipe and the outer wall of the first steel pipe by using a molding press, wherein the diameter of the interior village pipe exposed out of the two ends of the second steel pipe is the same as that of the outer wall of the first steel pipe to form a right angle, and at the moment, the processing and manufacturing of the double-layer vacuum heat-preservation steel-plastic composite oil pipe are finished, and each double-layer vacuum heat-preservation steel-plastic composite oil pipe is processed and manufactured by the steps.
Preferably, the installation of the welding sleeve: processing a welding sleeve, wherein the length of the welding sleeve is 2-2.5 times of the outer diameter of the first steel pipe, the inner diameter of the welding sleeve is 0.5-1mm larger than the outer diameter of the first steel pipe so as to be sleeved on the outer wall of the first steel pipe, the wall thickness of the welding sleeve is 1.5-2 times of the wall thickness of the first steel pipe, a double-layer vacuum steel-plastic oil pipe is taken, an outer anticorrosive layer at two ends is polished to a first steel pipe substrate by an electric steel brush, the length of the welding sleeve is 1.5 times of the length of the welding sleeve, the welding sleeve is sleeved at one end, and the length of the welding sleeve is determined by a welding opening on a vacuum layer at the end part.
Preferably, the g. welding: taking a double-layer steel pipe with an outer anticorrosive layer polished at the outer wall of the end part, aligning the end part of the steel pipe sleeved in a welding sleeve to expose the straight outer anticorrosive layer of the end part, using a plastic pipe hot melting butt welding machine to weld the straight sections of the outer anticorrosive layer of the end part of the two pipes into a whole, and treating the outer wall of a plastic welded junction by taking the sliding of the welding sleeve as the standard.
Preferably, the H. anti-corrosion heat-preservation ground pipeline welding structure is manufactured as follows: move the welding sleeve pipe to two pipe intermediate positions to the crater sets up on both ends vacuum layer as the standard, carries out electric welding to welding sleeve pipe both ends face and first steel pipe outer wall, and the welding standard is according to ground pipeline welding standard, and the standard is carried out, and this anticorrosion heat preservation ground pipeline welded structure accomplishes this moment, repeats this step and needs length to the pipeline.
Compared with the prior art, the invention has the beneficial effects that:
1. the inner hole of the second steel pipe is provided with an inner village pipe, and the two ends of the inner village pipe are flanged and connected with inner side hot melting molds to be pressed in the trapezoid grooves at the two ends, so that the problems that the inner village pipe is easy to move and fall off are solved.
2. The straight section of village pipe end in the double-layer pipe is formed into an organic whole by plastic hot melt butt welding, and the welding sleeve pipe is formed into an organic whole by welding the two ends of the outer wall of the first steel pipe by electric welding, so that an anti-corrosion heat-preservation ground pipeline welding structure is formed, the weld seam of the village pipe in the inner pipe can be seamless without leakage points, the outer weld seam is arranged on a vacuum layer at the two pipe ends, and the vacuum layer blocks the damage of electric welding high temperature to the village pipe in the welding process.
3. The ground pipeline is connected with the inner wall and the outer wall in an infinite length mode and has no steel exposed point, the inner hole of the welded junction does not need to be subjected to internal corrosion prevention joint coating treatment after welding, the all-round corrosion prevention effect is achieved, the second steel pipe and the inner village pipe are welded into a whole through hot melting, the two pipes are welded into a whole, no gap or leakage point exists at the welded joint, and the complete long-acting corrosion prevention effect of the whole pipeline is achieved.
4. The crater is arranged on the vacuum layer, the vacuum layer prevents the electric welding heat conduction from damaging the inner village pipe in the second steel pipe, and the inner village pipe does not need to be repaired.
5. The inner anti-corrosion layer is lined in the inner hole of the second steel pipe by adopting an integral plastic pipe processed by a PP-PE modified material, the inner wall of the plastic pipe is high in smoothness, small in frictional resistance and low in friction coefficient, the flow speed is increased by 15% -20% compared with that of a steel pipe with the same diameter, and the power output is reduced by 15%. Because the inner anti-corrosion layer is an integral plastic pipe with a lining, the plastic pipe is made of PP material with heat conduction coefficient being lower than 171.42-207.67 times of steel material, the PP heat conduction coefficient is 0.21-0.26, and the steel material heat conduction coefficient is 36-54. The inner hole of the lining plastic pipe manufactured by adopting the vacuum processing technology has high surface smoothness, small friction coefficient, good self-sliding property and low friction coefficient, and the friction coefficient is 0.219 mN/m. And because the lining pipe is made of the PP material made of the PP modified material and has a saturated molecular group structure, the lining pipe can resist the erosion of strong chemical substances, has a smooth surface like a mirror, increases the flow rate by 10-15% compared with a steel pipe with the same diameter, reduces the power output by 15%, improves the ground pipeline conveying capacity, reduces the conveying power and reduces the conveying cost.
6. The vacuum layer has the heat preservation effect, the temperature is increased by 22-25 ℃ compared with the static temperature of a steel pipe with the same diameter, the consumption of heating fuel oil of a heating station is reduced, the number of the heating stations along the line is reduced, and the crude oil conveying cost is reduced.
Drawings
FIG. 1 is a schematic view of the overall structure of a steel-plastic composite ground pipeline of a welding structure of an anti-corrosion heat-insulation ground pipeline of the invention;
FIG. 2 is a schematic structural view of a double-layer vacuum steel pipe of the anti-corrosion heat-preservation ground pipeline welding structure of the invention;
FIG. 3 is a schematic view of a second steel pipe installation structure of the anti-corrosion heat-preservation ground pipeline welding structure of the invention;
FIG. 4 is a schematic structural view of the plastic layer coated by the plastic pipe of the anti-corrosion and thermal insulation ground pipeline lining.
In the figure: 1. the end surface of the lining pipe is a straight section; 2. an end anticorrosive layer; 3. a trapezoidal groove; 4. connecting sleeves; 5. A first steel pipe; 6. a vacuum layer; 7. an outer corrosion resistant layer; 8. a support sleeve; 9. inner village pipes; 10. a second steel pipe; 11. welding a sleeve; 12. a plastic slit; 13. and (7) welding the opening.
Detailed Description
As shown in fig. 1 to 4, the present invention provides a technical solution: a corrosion-resistant heat-preservation ground pipeline welding structure and a welding method comprise a liner pipe end face straight section 1 and a second steel pipe 10, wherein a tip corrosion-resistant layer 2 is arranged on the right side of the liner pipe end face straight section 1, a ladder-shaped groove 3 is arranged on the right side of the tip corrosion-resistant layer 2, a connecting sleeve 4 is arranged outside the ladder-shaped groove 3, a first steel pipe 5 is arranged at the upper end of the connecting sleeve 4, a vacuum layer 6 is arranged on the right side of the connecting sleeve 4, a supporting sleeve 8 is arranged on the right side of the vacuum layer 6, the second steel pipe 10 is located at the lower end of the supporting sleeve 8, a liner pipe 9 is arranged at the lower end of the second steel pipe 10, an outer corrosion-resistant layer 7 and a welding sleeve 11 are sequentially arranged outside the first steel pipe 5 from left to right, a plastic welding nozzle 12 is arranged at the lower end of the inner side of the welding sleeve 11, and weld craters 13 are arranged at the left end and the right end of the welding sleeve 11;
the operation is as follows, the second steel pipe 10 has the inner village pipe 9 in the bore, the inner village pipe 9 two ends turn-ups and inner side hot melting mould presses in the two ends ladder type groove 3, the problem that the inner village pipe 9 is easy to move and fall off is solved, the end straight section of the inner village pipe 9 of the double-layer pipe is welded into a whole by plastic hot melting butt joint, the welding sleeve 11 welds the two ends of the outer wall of the first steel pipe 5 into a whole by electric welding, the anti-corrosion and heat preservation ground pipeline welding structure is formed, the inner village pipe 9 weld joint can be seamless without leakage point, the outer weld joint 13 is arranged on the two-pipe end vacuum layer 6, the vacuum layer 6 obstructs the damage of electric welding high temperature to the inner pipe 9 during welding, the ground pipeline is connected with unlimited length without steel bare dew point on the inner wall, and the inner hole of the weld joint 13 does not need to be treated by anti-corrosion joint after welding, the all-round anti-corrosion effect is achieved, the second steel pipe 10 and the inner village pipe 9 are welded into a whole by hot melting butt joint, the weld seam has no gap or leakage point, so as to achieve the effect of complete long-acting corrosion prevention of the whole pipeline, the weld seam 13 is arranged on the vacuum layer 6, the vacuum layer 6 prevents the electric welding heat conduction from damaging the inner village pipe 9 inside the second steel pipe 10, and the inner village pipe 9 does not need to be repaired.
The welding method of the anti-corrosion heat-insulation ground pipeline comprises the following steps: A. selecting a steel pipe: selecting a first steel pipe 5 and a second steel pipe 10, wherein the lengths of the two pipes are the same, the wall thickness of the first steel pipe 5 is larger than that of the second steel pipe 10, the wall thickness is based on the outer diameter of the first steel pipe 5, the pipe diameter is large, the wall thickness is small, the wall thickness is thin, the outer diameter of the second steel pipe 10 is smaller than the inner diameter of the first steel pipe 5 by 6-20mm, a vacuum layer 6 is formed, the size of the vacuum layer 6 is based on the inner diameter of the first steel pipe 5, the size of the vacuum layer 6 is large when the diameter is large, the size of the vacuum layer 6 is small when the diameter is small, the first steel pipe 5 is executed according to an oil pipe execution standard, and the second steel pipe 10 is executed according to a ground pipeline standard;
B. manufacturing a double-layer vacuum steel pipe: installing the connecting sleeves 4 and the middle supporting sleeves 8 on the outer wall of the second steel pipe 10 at equal intervals, welding the connecting sleeves 4 at two ends and the middle supporting sleeves 8 on the outer wall of the second steel pipe 10 by using an electric resistance welding process, penetrating the second steel pipe 10 into an inner hole of the first steel pipe 5, aligning two ends, and welding the first steel pipe 5 and the second steel pipe 10 into a whole by using a vacuum seal welding process, wherein the two ends are aligned and the lengths are the same;
C. manufacturing a lining plastic pipe: modifying and granulating a selected PP-PE plastic raw material by using a parallel double-screw granulator, wherein the modified PP-PE plastic raw material has memory property and elastoplasticity, processing an inner village pipe 9 by using a plastic extruder vacuum forming process, wherein the outer diameter of the inner village pipe 9 is 1-3mm larger than the inner diameter of a second steel pipe 10, performing sand blasting, rust removing and shot blasting treatment on the inner wall of the double-layer vacuum steel pipe to reach the Sa2.5-level standard, penetrating the prefabricated inner village pipe 9 into the inner hole of the second steel pipe 10 by using a reducing machine while reducing the diameter, respectively growing 250mm of second steel pipes 10 and 200 at two ends of the inner village pipe 9, adjusting the length, placing the pipe at normal temperature for 72-120 hours after penetrating the pipe 9, and naturally rebounding the outer wall of the inner village pipe 9 to tightly abut against the inner wall of the second steel pipe 10 to form an inner anticorrosive layer;
D. coating an anticorrosive heat-insulating layer on the outer wall of the double-layer vacuum steel pipe by hot melting: carrying out sand blasting and rust removing treatment on the outer wall of the double-layer vacuum steel pipe to reach the Sa2.5-level standard, carrying out medium-frequency heating on the double-layer vacuum steel pipe during transmission and walking by using a transmission roller, enabling the steel pipe subjected to medium-frequency heating to enter an inner hole of a right-angle machine head of an extruder at a constant speed, coating an outer anticorrosive layer 7 on the outer wall, cooling a moving part when the steel pipe coated with the outer anticorrosive layer 7 moves out of the machine head for 100-200mm, and cooling to room temperature, thus finishing the processing of the double-layer vacuum steel-plastic composite oil pipe with the plastic lining pipe 9 and the outer wall hot-melt coated with the outer anticorrosive layer 7;
E. forming the double-layer vacuum heat-preservation steel-plastic composite oil pipe: cutting both ends of the inner village pipe 9 to expose 25-30mm of the end part of the second steel pipe 10, adjusting the wall thickness of the double-layer steel pipe, heating the inner village pipe 9 exposed out of both ends of the second steel pipe 10 to a melting temperature, and molding the inner village pipe into the trapezoid groove 3 at the end part of the double-layer steel pipe and the outer wall of the first steel pipe 5 by using a molding press, wherein the diameter of the inner village pipe is the same as that of the outer wall of the first steel pipe 5 to form a right angle, and at the moment, the processing and manufacturing of one double-layer vacuum heat-preservation steel-plastic composite oil pipe are finished, and each double-layer vacuum heat-preservation steel-plastic composite oil pipe is processed and manufactured by the steps;
F. installing a welding sleeve: processing a welding sleeve 11, wherein the length of the welding sleeve 11 is 2-2.5 times of the outer diameter of the first steel pipe 5, the inner diameter of the welding sleeve 11 is 0.5-1mm larger than the outer diameter of the first steel pipe 5 so as to be sleeved on the outer wall of the first steel pipe 5, the wall thickness of the welding sleeve 11 is 1.5-2 times of the wall thickness of the first steel pipe 5, taking a double-layer vacuum steel-plastic oil pipe, polishing the outer anticorrosive layers 7 at two ends to the bottom material of the first steel pipe 5 by using an electric steel wire brush, the length of the welding sleeve 11 is 1.5 times of the length of the welding sleeve 11, and sleeving the welding sleeve 11 at one end, wherein the length of the welding sleeve 11 is based on a welding opening 13 on a vacuum layer 6 at the end part;
G. welding: taking a double-layer steel pipe with an outer anti-corrosion layer 7 polished off on the outer wall of the end part, aligning the end part of the steel pipe sleeved into a welding sleeve 11, exposing the straight outer anti-corrosion layer 7 on the end part, welding the straight sections of the outer anti-corrosion layers at the end parts of the two pipes into a whole by using a plastic pipe hot melting butt welding machine, and treating the outer wall of a plastic welding port 13 on the basis that the welding sleeve can slide;
H. manufacturing a welding structure of the anti-corrosion heat-insulation ground pipeline: moving the welding sleeve 11 to the middle position of the two pipes, carrying out electric welding on two end faces of the welding sleeve 11 and the outer wall of the first steel pipe 5, wherein the welding standard is carried out according to the standard of ground pipeline welding, and the step is repeated until the pipeline needs to be long;
the working principle is as follows: selecting a first steel pipe 5 and a second steel pipe 10, wherein the lengths of the two pipes are the same, the wall thickness of the first steel pipe 5 is larger than that of the second steel pipe 10, the wall thickness is based on the outer diameter of the first steel pipe 5, the pipe diameter is large, the wall thickness is thin if the pipe diameter is small, the outer diameter of the second steel pipe 10 is smaller than the inner diameter of the first steel pipe 5 by 6-20mm, the vacuum layer 6 is formed, the size of the vacuum layer 6 is based on the inner diameter of the first steel pipe 5, the vacuum layer 6 is large if the pipe diameter is large, the vacuum layer 6 is small if the pipe diameter is small, the first steel pipe 5 is executed according to an oil pipe execution standard, the second steel pipe 10 is executed according to a ground pipeline standard, the connecting sleeves 4 and the middle supporting sleeves 8 are equidistantly installed on the outer wall of the second steel pipe 10, the connecting sleeves 4 at two ends and the middle supporting sleeve 8 are welded on the outer wall of the second steel pipe 10 by an electric resistance welding process, the second steel pipe 10 is inserted into an inner hole of the first steel pipe 5, the two ends are aligned, the lengths are the same, the first steel pipe 5 and the second steel pipe 10 are welded by a vacuum sealing process, modifying and granulating a selected PP-PE plastic raw material by using a parallel double-screw granulator, wherein the modified PP-PE plastic raw material has memory property and elastoplasticity, processing an inner village pipe 9 by using a plastic extruder vacuum forming process, wherein the outer diameter of the inner village pipe 9 is 1-3mm larger than the inner diameter of a second steel pipe 10, performing sand blasting, rust removing and shot blasting treatment on the inner wall of a double-layer vacuum steel pipe to reach the Sa2.5-level standard, penetrating the prefabricated inner village pipe 9 into the inner hole of the second steel pipe 10 by using a reducing machine while reducing the diameter, wherein the length of the second steel pipe 10 grown at two ends of the inner village pipe 9 is 250mm, the length of the prefabricated inner village pipe is adjustable, placing the prefabricated inner village pipe 9 at normal temperature for 72-120 hours, naturally rebounding the outer wall of the inner village pipe 9 to tightly abut against the inner wall of the second steel pipe 10 to form an inner anticorrosive layer, performing sand blasting and rust removing treatment on the outer wall of the double-layer vacuum steel pipe to reach the Sa2.5-level standard, conveying the double-layer vacuum steel pipe by using a conveying roller to perform intermediate frequency heating during traveling, the steel pipe heated by the medium frequency enters an inner hole of a right-angle head of an extruder at a constant speed, an outer anticorrosive layer 7 is coated on the outer wall, the steel pipe coated with the outer anticorrosive layer 7 is moved out of the head by 100 mm and 200mm, the moved part is cooled in the movement, the temperature is cooled to room temperature, then the processing of the double-layer vacuum steel-plastic composite oil pipe with the inner plastic lining pipe 9 and the outer wall hot melting coated with the outer anticorrosive layer 7 is finished, the two ends of the inner village pipe 9 are cut to expose the end part of the second steel pipe 10 to be 25-30mm long, the wall thickness of the double-layer steel pipe can be adjusted, the inner village pipe 9 exposed out of the two ends of the second steel pipe 10 is heated to the melting temperature, the inner village pipe is molded into the end part ladder-shaped groove 3 of the double-layer steel pipe and the outer wall of the first steel pipe 5 by a molding press, the diameter of the inner village pipe is the same as the outer wall of the first steel pipe 5 to form a right-angle shape, at the time, the processing and the manufacturing of the double-layer vacuum steel-plastic composite oil pipe are finished, each double-plastic composite oil pipe is processed and manufactured by the steps, processing a welding sleeve 11, wherein the length of the welding sleeve 11 is 2 to 2.5 times of the outer diameter of a first steel pipe 5, the inner diameter is 0.5 to 1mm larger than the outer diameter of the first steel pipe 5, so as to be sleeved on the outer wall of the first steel pipe 5, the wall thickness of the welding sleeve 11 is 1.5 to 2 times of the wall thickness of the first steel pipe 5, taking a double-layer vacuum steel-plastic oil pipe, polishing the outer anticorrosive layers 7 at two ends to the substrate of the first steel pipe 5 by using an electric steel wire brush, the length of the welding sleeve 11 is 1.5 times of the length of the welding sleeve 11, sleeving one end of the welding sleeve 11, taking the length of the welding sleeve 11 so as to enable a welding opening 13 to be positioned on a vacuum layer 6 at the end part, polishing the double-layer steel pipe of the outer anticorrosive layers 7 at one end part, enabling the end part to be aligned with the end part of the steel pipe sleeved in the welding sleeve 11 to expose the end part of the straight anticorrosive layers 7, welding the outer anticorrosive layers 7 at two pipe ends into a whole by using a plastic pipe hot melting welding machine, and processing the outer wall of the plastic welding opening 13, and moving the welding sleeve 11 to the middle position of the two pipes by taking the sliding of the welding sleeve as a reference, performing electric welding on two end faces of the welding sleeve 11 and the outer wall of the first steel pipe 5, and executing the welding standard according to the ground pipeline welding standard in a standard manner, so far, completing the welding structure of the anticorrosion and heat-preservation ground pipeline, and repeating the step until the pipeline needs the required length.
Claims (10)
1. The anti-corrosion heat-preservation ground pipeline welding structure is characterized by comprising an inner lining pipe end face straight section (1) and a second steel pipe (10), wherein an end anti-corrosion layer (2) is arranged on the right side of the inner lining pipe end face straight section (1), a ladder-shaped groove (3) is formed in the right side of the end anti-corrosion layer (2), a connecting sleeve (4) is arranged outside the ladder-shaped groove (3), a first steel pipe (5) is arranged at the upper end of the connecting sleeve (4), a vacuum layer (6) is arranged on the right side of the connecting sleeve (4), a supporting sleeve (8) is arranged on the right side of the vacuum layer (6), the second steel pipe (10) is located at the lower ends of the supporting sleeve (8) and the end connecting sleeve (4), an inner village pipe (9) is arranged at the lower end of the second steel pipe (10), an outer anti-corrosion layer (7) and a welding sleeve (11) are sequentially arranged outside the first steel pipe (5) from left to right, the lower extreme of the inboard of welding sleeve pipe (11) is provided with plastics seam (12), and both ends are provided with crater (13) about welding sleeve pipe (11).
2. The welding structure and the welding method for the corrosion-resistant heat-insulating ground pipeline according to claim 1 are characterized in that the welding method for the corrosion-resistant heat-insulating ground pipeline comprises the following steps: A. selecting a steel pipe; B. manufacturing a double-layer vacuum steel pipe; C. manufacturing a lining plastic pipe; D. coating an anticorrosive heat-insulating layer on the outer wall of the double-layer vacuum steel pipe in a hot melting way; E. forming the double-layer vacuum heat-preservation steel-plastic composite oil pipe; F. installing a welding sleeve; G. welding; H. manufacturing a welding structure of the anti-corrosion heat-insulation ground pipeline; I. finishing connection;
a, selecting steel pipes: select first steel pipe (5) and second steel pipe (10), two pipe length are the same, first steel pipe (5) wall thickness is greater than second steel pipe (10), the wall thickness uses first steel pipe (5) external diameter as the benchmark, the big pipe wall thickness of pipe diameter, the pipe diameter is little then wall thickness is thin, second steel pipe (10) external diameter is less than first steel pipe (5) internal diameter 6-20mm and is vacuum layer (6), vacuum layer (6) size uses first steel pipe (5) internal diameter as the standard, the diameter is big then vacuum layer (6) are big, the diameter is little then vacuum layer (6) are little, first steel pipe (5) are executed according to the oil pipe execution standard, second steel pipe (10) are executed according to the ground pipeline standard.
3. The welding structure and the welding method of the corrosion-resistant heat-insulating ground pipeline according to claim 2, wherein B, manufacturing a double-layer vacuum steel pipe: the connecting sleeves (4) and the middle supporting sleeves (8) are equidistantly installed on the outer wall of the second steel pipe (10), the connecting sleeves (4) at the two ends and the middle supporting sleeves (8) are welded on the outer wall of the second steel pipe (10) through an electric resistance welding process, the second steel pipe (10) penetrates into an inner hole of the first steel pipe (5), the two ends are aligned, the lengths are the same, and the first steel pipe (5) and the second steel pipe (10) are welded into a whole through a vacuum seal welding process.
4. The welding structure and the welding method for the corrosion-resistant heat-preservation ground pipeline according to claim 2, wherein the manufacturing of the lining plastic pipe comprises the following steps: modifying and granulating a selected PP-PE plastic raw material by using a parallel double-screw granulator, wherein the modified PP-PE plastic raw material has memory property and elastoplasticity, processing an inner village pipe (9) by using a plastic extruder vacuum forming process, wherein the outer diameter of the inner village pipe (9) is 1-3mm larger than the inner diameter of a second steel pipe (10), performing sand blasting, rust removing and shot blasting treatment on the inner wall of the double-layer vacuum steel pipe to reach the Sa2.5-level standard, penetrating the prefabricated inner village pipe (9) into an inner hole of the second steel pipe (10) by using a reducing machine while reducing the diameter, respectively growing 200-250mm second steel pipes (10) at two ends of the inner village pipe (9), adjusting the length, placing the pipe at normal temperature for 72-120 hours after penetrating the pipe (9), and naturally rebounding the outer wall of the inner village pipe (9) to tightly abut against the inner wall of the second steel pipe (10) to form an inner anticorrosive layer.
5. The welding structure and the welding method for the anti-corrosion heat-insulation ground pipeline according to claim 2, wherein the anti-corrosion heat-insulation layer is hot-melted and coated on the outer wall of the double-layer vacuum steel pipe: carrying out sand blasting and rust removing treatment on the outer wall of the double-layer vacuum steel pipe to reach the Sa2.5-level standard, carrying out intermediate frequency heating in the transmission and walking process of the double-layer vacuum steel pipe by using a transmission roller, enabling the steel pipe subjected to intermediate frequency heating to enter an inner hole of a right-angle machine head of an extruder at a constant speed, coating an outer anticorrosive layer (7) on the outer wall, cooling a moving part when the steel pipe coated with the outer anticorrosive layer (7) moves out of the machine head for 100 mm and 200mm, and cooling to room temperature, thus finishing the processing of the double-layer vacuum steel-plastic composite oil pipe with the inner village plastic pipe (9) and the outer wall hot-melting coated with the outer anticorrosive layer (7).
6. The welding structure and the welding method for the anti-corrosion heat-preservation ground pipeline according to claim 2 are characterized in that the E-double-layer vacuum heat-preservation steel-plastic composite oil pipe is formed by the following steps: cutting the two ends of the inner village pipe (9) until the end part of the second steel pipe (10) is exposed to be 25-30mm long, adjusting the wall thickness of the double-layer steel pipe, heating the inner village pipe (9) exposed to the two ends of the second steel pipe (10) to a melting temperature, and molding the inner village pipe and the outer village pipe into the trapezoid groove (3) at the end part of the double-layer steel pipe and the outer wall of the first steel pipe (5) by using a molding press, wherein the diameter of the inner village pipe and the outer wall of the first steel pipe are the same as the diameter of the outer wall of the first steel pipe (5) to form a right-angle shape, and at the moment, the processing and manufacturing of the double-layer vacuum heat-insulation steel-plastic composite oil pipe are finished, and each double-layer vacuum heat-insulation steel-plastic composite oil pipe is processed and manufactured by the steps.
7. The anti-corrosion heat-preservation ground pipeline welding structure and the welding method according to claim 2, wherein the installation of the F-welding sleeve comprises the following steps: processing welding sleeve pipe (11), welding sleeve pipe (11) length is 2 times to 2.5 times of first steel pipe (5) external diameter, the internal diameter is 0.5-1mm than first steel pipe (5) external diameter, it is accurate on can emboliaing first steel pipe (5) outer wall, welding sleeve pipe (11) wall thickness is 1.5 times to 2 times of first steel pipe (5) wall thickness, it moulds oil pipe to get a double-deck vacuum steel, with both ends outer anticorrosive coating (7), polish to first steel pipe (5) substrate with electronic steel brush, length is welding sleeve pipe (11) length 1.5 times, embolia one end with welding sleeve pipe (11), welding sleeve pipe (11) length is accurate on welding seam (13) pipe end vacuum layer (6).
8. The welding structure and the welding method for the corrosion-resistant heat-preservation ground pipeline according to claim 2 are characterized in that G welding: a double-layer steel pipe with an outer anticorrosive layer (7) polished at the outer wall of the end part is taken, the end part of the steel pipe sleeved with a welding sleeve (11) in an aligned mode is exposed out of the straight outer anticorrosive layer (7) of the end part, the flat outer anticorrosive layer (7) of the end part is welded integrally by a plastic pipe hot melting butt welding machine, the outer wall of a plastic welding opening (13) is processed, and the welding sleeve can slide.
9. The anti-corrosion heat-insulation ground pipeline welding structure and the welding method according to claim 2, wherein the H. anti-corrosion heat-insulation ground pipeline welding structure is manufactured by the following steps: and moving the welding sleeve (11) to the middle position of the two pipes, and carrying out electric welding on two end faces of the welding sleeve (11) and the outer wall of the first steel pipe (5), wherein the welding standard is executed according to the ground pipeline welding standard, and the anticorrosion heat-preservation ground pipeline welding structure is completed.
10. The structure and the method for welding the anti-corrosion heat-insulation ground pipeline according to claim 2 are characterized in that the outer wall (11) of the welding sleeve and the welded junctions (13) at two ends are subjected to anti-corrosion treatment on the steel pipes with anti-corrosion layers polished at the end parts of the two pipes according to the external anti-corrosion joint coating specification, and the welded junctions and the outer wall of the welding sleeve are subjected to anti-corrosion treatment until the two double-layer heat-insulation steel pipes are connected, and the steps are repeated until the required length of the pipeline is reached.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114110297A (en) * | 2021-11-30 | 2022-03-01 | 南京苏夏设计集团股份有限公司 | Plastic-sheathed steel steam direct-buried prefabricated pipeline and construction joint coating method |
| CN114198584A (en) * | 2021-12-16 | 2022-03-18 | 大庆石油管理局有限公司松原装备制造分公司 | Anti-corrosion connecting structure in gathering and transportation pipeline of metering station and processing method thereof |
| CN114233941A (en) * | 2022-01-22 | 2022-03-25 | 张志民 | Steel-plastic composite steel-plastic connecting gathering and transportation pipeline without repaired mouth and processing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114110297A (en) * | 2021-11-30 | 2022-03-01 | 南京苏夏设计集团股份有限公司 | Plastic-sheathed steel steam direct-buried prefabricated pipeline and construction joint coating method |
| CN114198584A (en) * | 2021-12-16 | 2022-03-18 | 大庆石油管理局有限公司松原装备制造分公司 | Anti-corrosion connecting structure in gathering and transportation pipeline of metering station and processing method thereof |
| CN114198584B (en) * | 2021-12-16 | 2024-06-04 | 松原市大庆油田汽车改装有限公司 | Anti-corrosion connection structure in metering station gathering and conveying pipeline and processing method thereof |
| CN114233941A (en) * | 2022-01-22 | 2022-03-25 | 张志民 | Steel-plastic composite steel-plastic connecting gathering and transportation pipeline without repaired mouth and processing method |
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