Pipeline lining pipe repairing machine under anti-explosion environment and operation method

Abstract

The invention relates to the technical field of operation and maintenance of production devices in anti-explosion places in the petroleum and petrochemical industry, in particular to a pipeline lining pipe repairing machine in an anti-explosion environment and an operation method. The repairing machine comprises a sealing pipe storage bin, a sealing liner pipe wound into a coil is stored in the sealing pipe storage bin, the lower end of the sealing pipe storage bin is communicated with a supporting cylinder, the two sides of the supporting cylinder are communicated with a gas pipe connector and a connector respectively, and a gas heater is installed in the supporting cylinder and connected with the gas pipe connector. One end of the gas heater is connected with a heating control assembly; the other end of the connector is connected with a lip; the lip is connected with an operation pipeline; the top end of the connector is provided with a ball valve; and the operation pipeline is mounted in the pressure container. According to the repairing machine and the operation method, the problem that open fire operation cannot be conducted in the anti-explosion environment is effectively solved.

Description

Technical Field

[0001] The present invention relates to the technical field of operation and maintenance of production devices in explosion-proof places in the oil and petrochemical industries, and particularly relates to a pipeline inner liner repair machine and an operation method in an explosion-proof environment. Background Art

[0002] During the production process in the oil and petrochemical industries, there are a large number of oil and gas explosion-proof places. According to industry regulations, production devices with explosion-proof requirements must be installed in oil and gas explosion-proof places. However, during operation, once there is a leakage in the internal pipeline of the production device, it involves relatively large safety risks. Generally speaking, the production device cannot be repaired for leakage through conventional electric welding equipment. If the leaking pipeline is in an area inside the device that cannot be disassembled, relevant repairs cannot be completed on site.

[0003] For example, in oilfield production, the oil and gas metering separator commonly used in metering rooms has an integrated separator with an independently circulating heating pipeline inside. The heating pipeline provides heating for the produced fluid in the separator to avoid the condensation of crude oil in the produced fluid. However, after a long service life, this part of the pipeline often leaks due to corrosion, causing the hot water in the heating pipe to enter the separator, resulting in inaccurate metering of the separator and making it unusable.

[0004] The internal structure of the separator is complex and compact, making it difficult to thoroughly clean the residual oil inside. Moreover, the operators cannot enter the interior for repair, and there are huge safety risks in disassembling the separator on site. In response to this problem, the common practice in the industry is to stop production, disassemble the connecting pipeline between the separator and the roof of the metering room, lift the separator out of the metering room and return it to the factory, clean the interior of the separator outdoors, and then cut the outer wall of the separator to repair the leakage point of the internal heating pipe. The entire operation process is complicated and costly, seriously affecting oilfield production.

[0005] In addition, there are also some pipelines in a concealed state, such as buried pipelines passing through roads that cannot be excavated, and single pipelines inside a group of pipelines in a bridge that cannot be separated from the inside. There are problems with leakage repair that cannot be carried out from the outside. Similar situations also widely exist in the production of various oil and petrochemical industries, becoming a chronic problem in the industry. Therefore, in view of the above deficiencies, a pipeline inner liner repair machine and an operation method in an explosion-proof environment are proposed. Summary of the Invention

[0006] (I) Technical Problems to be Solved The present invention provides a pipeline inner liner repair machine and an operation method in an explosion-proof environment, avoiding the problems in the existing methods that in an explosion-proof environment, the production device must be disassembled, conventional electric welding equipment needs to be used, and it is impossible to repair the leakage point inside the pipeline.

[0007] (II) Technical Solutions To solve the above problems, the present invention provides a repair machine for the inner lining pipe of a pipeline in an explosion-proof environment, comprising: A sealed pipe storage bin, inside which a sealed lining pipe wound in a roll is stored. The lower end of the sealed pipe storage bin communicates with a support cylinder. On both sides of the support cylinder, an air pipe joint and a connector are respectively communicated. A gas heater is installed inside the support cylinder. The gas heater is connected to the air pipe joint, and the other side of the air pipe joint is connected to an external air pipe assembly. One end of the gas heater is connected to a heating control assembly. The other end of the connector is connected to a lip, the lip is connected to a working pipeline, a ball valve is installed at the top of the connector, a flange plate is installed outside the connector, the flange plate is connected to a first flange, the first flange is connected to a second flange, and the working pipeline is installed inside a pressure vessel.

[0008] Preferably, the sealed pipe storage bin is a cylindrical bin body, a detachable sealing cover is provided at the top of the sealed pipe storage bin, a horizontal shaft hole is provided at the center of the sealed pipe storage bin, a reel is inserted into the sealed pipe storage bin through the horizontal shaft hole, and the sealed lining pipe is wound around the outside of the reel.

[0009] Preferably, an internal channel is provided in the middle of the gas heater. The gas heater is connected to the air pipe joint through the internal channel, and gas can be introduced into the internal channel for heating.

[0010] Preferably, the heating control assembly is installed outside the support cylinder. The heating control assembly includes a heating controller and a cable. The heating controller is connected to one end of the gas heater, and the other end of the heating controller is connected to the cable.

[0011] Preferably, the external air pipe assembly includes an air pipe and a quick connector. The two sides of the air pipe are respectively connected to the air pipe joint and the quick connector, and the air pipe is connected to the air source through the quick connector.

[0012] Preferably, the connector installs the ball valve through a short joint, and a handle is provided on the ball valve.

[0013] Preferably, the flange plate fixes the first flange through bolts, the first flange fixes the second flange through bolts. The diameter of the first flange is larger than that of the second flange. A sealing groove is provided inside the first flange, and a sealed lining pipe is installed inside the sealing groove. The outside of the notch of the sealing groove is the pipe head of the sealed lining pipe. A sealed pipe pressing ring is embedded between the port of the first flange and the working pipeline.

[0014] The present invention also provides an operation method based on the repair machine for the inner lining pipe of a pipeline in an explosion-proof environment, comprising: Step S1: Stop the production of the pressure vessel with leakage problems, drain the medium, purge the pipeline with nitrogen, connect the first flange to the connector and the flange plate respectively, and fix the first flange to the working pipeline through bolts; Step S2: Connect the ball valve installed on the connector in Step S1 to a hot water source, and perform degreasing operation on the working pipeline through the hot water source; Step S3: After completing the degreasing operation in Step S2, connect the gas pipe joint to the gas source through an external gas pipe assembly, and connect the heating control assembly to the power distribution line, and perform drying treatment on the working pipeline through the gas source; Step S4: After completing the drying treatment in Step S3, close the gas source and the heating control assembly, open the ball valve, inject a stabilizing agent into the working pipeline through the ball valve, put a compressed sponge ball into the connector through the ball valve, and use the sponge ball to apply the stabilizing agent to the working pipeline; Step S5: After completing the stabilizing agent in Step S4, inject a waterborne polyurethane adhesive into the working pipeline through the ball valve, put a compressed sponge ball into the connector through the ball valve, and use the sponge ball to apply the waterborne polyurethane adhesive to the working pipeline; Step S6: Pass the sealing liner in the sealing pipe storage bin through the support cylinder and the connector, the sealing liner is sleeved on the lip through stretching and flipping, and connect the sealing liner to the working pipeline; Step S7: Start the gas source, continuously blow air into the support cylinder, the sealing liner rolls and expands from the inside to the outside in the working pipeline, the sealing liner is positioned and tightly attached to the working pipeline through the waterborne polyurethane adhesive in Step S5, and the edge of the sealing liner is pressed and installed in the sealing groove of the first flange to complete the operation.

[0015] Preferably, in Step S4, the stabilizing agent seals and protects the rust-damaged area inside the working pipeline, and the stabilizing agent includes a waterborne polyurethane rust stabilizing agent.

[0016] Preferably, in Step S5, the waterborne polyurethane adhesive is a waterborne epoxy resin adhesive. Beneficial effects

[0017] The pipeline inner liner repair machine and operation method in an explosion-proof environment provided by the present invention solve the problem of pipeline leakage by installing an inner liner repair machine to lay a liner inside a leaking pipeline, and solve the problem that open fire operations cannot be carried out by electric welding in an explosion-proof environment. Especially suitable for the situation where the pipeline is in a concealed area such as equipment or the ground and direct contact operations cannot be carried out directly. The operation method of using the inner liner repair machine to lay a flexible inner liner inside the pipeline to repair pipeline leakage has a wide application prospect in the petrochemical field. Description of the drawings

[0018] Figure 1 It is a schematic structural diagram of the pipeline inner liner repair machine in an explosion-proof environment according to an embodiment of the present invention; Figure 2 It is a schematic connection diagram of the unsealed liner and the pipeline to be operated without expansion according to an embodiment of the present invention; Figure 3 This is a schematic diagram showing the connection between the expandable sealing liner and the operation pipeline in an embodiment of the present invention; Figure 4 This is a schematic diagram showing the connection between the expandable sealing liner and the first flange in an embodiment of the present invention; Figure 5 This is an effect diagram showing the treatment of the first flange after the plugging operation in an embodiment of the present invention; Figure 6 This is a schematic diagram showing the connection between the sealing liner and the sealing pipe compression ring in an embodiment of the present invention; Figure 7 This is a schematic diagram showing the connection between the operation pipeline and the pressure vessel in an embodiment of the present invention.

[0019] Wherein: 1 - sealing liner; 2 - sealing pipe storage bin; 3 - gas pipe joint; 4 - gas heater; 5 - connector; 6 - lip; 7 - support cylinder; 8 - flange plate; 9 - ball valve; 10 - nipple; 11 - handle; 12 - heating control assembly; 13 - operation pipeline; 14 - external gas pipe assembly; 15 - first flange; 16 - bolt; 17 - second flange; 18 - sealing pipe compression ring; 19 - pressure vessel. Embodiment

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0021] In the description of the present invention, it is necessary to understand that the orientation or positional relationship indicated by "upper", "lower", "inner", "outer", "top", "bottom", etc. is based on the orientation or positional relationship shown in the drawings. The purpose is only to facilitate the description of the present invention and simplify the description, rather than indicating or implying that the components referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present invention.

[0022] As Figures 1 to 7 shown, the present invention provides a pipeline inner liner repair machine in an explosion-proof environment, including: The sealed pipe storage bin 2 has a coiled sealed liner 1 stored inside. The lower end of the sealed pipe storage bin 2 communicates with a support cylinder 7. On both sides of the support cylinder 7, an air pipe joint 3 and a connector 5 are respectively communicated. A gas heater 4 is installed inside the support cylinder 7. The gas heater 4 is connected to the air pipe joint 3. The other side of the air pipe joint 3 is connected to an external air pipe assembly 14. One end of the gas heater 4 is connected to a heating control assembly 12. The other end of the connector 5 is connected to a lip 6. The lip 6 is connected to an operation pipeline 13. A ball valve 9 is installed at the top of the connector 5. A flange plate 8 is installed outside the connector 5. The flange plate 8 is connected to a first flange 15. The first flange 15 is connected to a second flange 17. The operation pipeline 13 is installed inside a pressure vessel 19.

[0023] In this repair machine, the sealed pipe storage bin 2 is a cylindrical bin body. A detachable sealing cover is provided at the top of the sealed pipe storage bin 2. A horizontal shaft hole is provided at the center of the sealed pipe storage bin 2. The sealed pipe storage bin 2 inserts a reel through the horizontal shaft hole, and the sealed liner 1 is wound around the outside of the reel.

[0024] In practical applications, an internal channel is provided in the middle of the gas heater 4. The gas heater 4 is connected to the air pipe joint 3 through the internal channel. Gas can be introduced into the internal channel and heated. The heating control assembly 12 is installed outside the support cylinder 7. The heating control assembly 12 includes a heating controller and a cable. The heating controller is connected to one end of the gas heater 4, and the other end of the heating controller is connected to the cable.

[0025] In this repair machine, the external air pipe assembly 14 includes an air pipe and a quick connector. The two sides of the air pipe are respectively connected to the air pipe joint 3 and the quick connector. The air pipe is connected to a gas source through the quick connector. At the same time, the connector 5 installs the ball valve 9 through a short joint 10, and a handle 11 is provided on the ball valve 9.

[0026] In practical applications, the flange plate 8 fixes the first flange 15 through bolts 16. The first flange 15 fixes the second flange 17 through bolts 16. The diameter of the first flange 15 is larger than that of the second flange 16. A sealing groove is provided inside the first flange 15. The sealed liner 1 is installed inside the sealing groove. The outside of the notch of the sealing groove is the pipe head of the sealed liner 1. A sealed pipe compression ring 18 is embedded between the port of the first flange 15 and the operation pipeline 13.

[0027] The present invention also provides an operation method for a pipeline inner liner repair machine based on an explosion-proof environment, including: Step S1: Stop the production of the pressure vessel with leakage problems, empty the medium, purge the pipeline with nitrogen, connect the first flange to the connector and the flange plate respectively, and fix the first flange to the operation pipeline through bolts; Step S2: Connect the ball valve installed on the connector in Step S1 to a hot water source, and perform degreasing operation on the working pipeline through the hot water source; Step S3: After completing the degreasing operation in Step S2, connect the air pipe joint to the air source through an external air pipe assembly, and connect the heating control assembly to the power distribution line, and perform drying treatment on the working pipeline through the air source; Step S4: After completing the drying treatment in Step S3, close the air source and the heating control assembly, open the ball valve, inject a stabilizing agent into the working pipeline through the ball valve, put a compressed sponge ball into the connector through the ball valve, and use the sponge ball to apply the stabilizing agent to the working pipeline; Step S6: After completing the stabilizing agent in Step S4, inject a waterborne polyurethane adhesive into the working pipeline through the ball valve, put a compressed sponge ball into the connector through the ball valve, and use the sponge ball to apply the waterborne polyurethane adhesive to the working pipeline; Step S8: Pass the sealing liner in the sealing tube storage bin through the support cylinder and the connector, the sealing liner is sleeved on the lip through stretching and flipping, and connect the sealing liner to the working pipeline; Step S7: Start the air source, continuously blow air to the support cylinder, the sealing liner rolls and expands from the inside to the outside in the working pipeline, the sealing liner is positioned and tightly attached to the working pipeline through the waterborne polyurethane adhesive in Step S5, and the edge of the sealing liner is pressed and installed in the sealing groove of the first flange to complete the operation.

[0028] In this method, in Step S4, the stabilizing agent seals and protects the rust-damaged area inside the working pipeline, and the stabilizing agent includes a waterborne polyurethane rust stabilizing agent; in Step S5, the waterborne polyurethane adhesive is a waterborne epoxy resin adhesive.

[0029] The pipeline inner liner repair machine and operation method in the explosion-proof environment provided by the present invention solve the problem of pipeline leakage by installing an inner liner repair machine for laying a liner inside a leaking pipeline, and solve the problem that open-flame operations cannot be carried out by electric welding in the explosion-proof environment. Especially suitable for the situation where the pipeline is in a concealed area such as equipment or the ground and direct contact operations cannot be carried out directly. The operation method of using an inner liner repair machine to lay a flexible inner liner inside the pipeline to repair pipeline leakage has a wide application prospect in the petrochemical field.

[0030] Next, specifically describe the working principle of this pipeline inner liner repair machine in the explosion-proof environment: In this embodiment, the sealed liner 1 is stored inside the sealed tube storage bin 1 by being wound around. The lower end of the sealed tube storage bin 2 is connected to the support cylinder 7. The two sides of the support cylinder 7 are respectively connected to the air pipe joint 3 and the connector 5. The gas heater 4 is installed inside the support cylinder 7. The gas heater 4 is connected to the air pipe joint 3. The other side of the air pipe joint 3 is connected to the external air pipe assembly 14. One end of the gas heater 4 is connected to the heating control assembly 12. The other end of the connector 5 is connected to the lip 6. The lip 6 is connected to the operation pipeline 13. The top of the connector 5 is installed with a ball valve 9 through a short joint 10. A handle 11 is provided on the ball valve 9. A flange plate 8 is installed outside the connector 5. The flange plate 8 is connected to the first flange 15 through bolts 16. The first flange 15 is connected to the second flange 17 through bolts 16. A sealed tube pressing ring 18 is embedded between the port of the first flange 15 and the operation pipeline 13. The operation pipeline 13 is installed inside the pressure vessel 19.

[0031] The following specifically describes the implementation process of the operation method of the pipeline liner repair machine based on such an explosion-proof environment: Step 1: Shut down the pressure vessel with leakage problems, drain the medium, purge the pipeline with nitrogen, connect the first flange to the connector and the flange plate respectively, and fix the first flange to the operation pipeline through bolts.

[0032] In this embodiment, shut down the pressure vessel 19 with leakage problems, drain the medium, and purge the pipeline with nitrogen; remove the second flange 17 connected to the operation pipeline 13 to expose the first flange 15, clean the first flange 15, and install a sealing gasket; according to the specifications of the first flange 15, select the connector 5 and flange plate 8 of the liner repair machine with matching specifications, and fix the assembled liner repair machine to the first flange 15 at a higher position of the pipeline 13 to be operated through bolts 16.

[0033] Step 2: Connect the ball valve installed on the connector to a hot water source, and perform degreasing operation on the operation pipeline through the hot water source.

[0034] In this embodiment, connect the ball valve 9 on the upper part of the connector 5 to a hot water source outside the environment through a temporary pipeline, use hot water to circulate and clean the operation pipeline 13, and discharge and recycle the cleaning residual liquid from the outlet at the lower part of the pipeline 13 to be operated.

[0035] Step 3: After completing the degreasing operation, connect the air pipe joint to the air source through the external air pipe assembly, connect the heating control assembly to the power distribution line, and perform drying treatment on the operation pipeline through the air source.

[0036] In this embodiment, the supporting air pipe joint 3 externally connected to the inner liner pipe repair machine is connected to a nitrogen source or an air compressor outside the explosion-proof environment through an external air pipe assembly 14. The heating control assembly 12 is connected to the power distribution line. After the pipeline degreasing operation is completed, the temporary hot water pipeline on the ball valve 9 is removed, the ball valve 9 is closed, the connected nitrogen source of the inner liner pipe repair machine is started, the heating control assembly 12 is turned on, the gas entering the support cylinder 7 is heated, and the heated gas enters the operation pipeline 13 to perform a drying treatment on the operation pipeline 13.

[0037] Step Four: After the drying treatment is completed, close the gas source and the heating control assembly, open the ball valve, inject a stabilizer into the operation pipeline through the ball valve, put a compressed sponge ball into the connector through the ball valve, and use the sponge ball to apply the stabilizer to the operation pipeline.

[0038] In this embodiment, after the internal drying treatment of the operation pipeline 13 is completed, close the gas source and the heating control assembly 12, open the ball valve 9, calculate the dosage according to the pipeline length, inject a water-based polyurethane rust stabilizer into the ball valve 9, and let it flow into the operation pipeline 13; put a compressed sponge ball into the connector 5 through the ball valve 9. The outer diameter of the sponge ball is larger than the inner diameter of the operation pipeline 13. Close the ball valve 9, start the gas source, and use a pneumatic method to push the sponge ball to apply the water-based polyurethane rust stabilizer to the inner wall in the pipeline 13, and then recover the flowing water-based polyurethane rust stabilizer and the sponge ball from another lower outlet of the operation pipeline 13. Repeat the same operation several times to evenly apply the water-based polyurethane rust stabilizer to the inner wall of the operation pipeline 13. Do not heat the gas source and continuously ventilate and dry the operation pipeline 13 for 4 - 6 hours.

[0039] Step Five: After the stabilizer is applied, inject a water-based polyurethane adhesive into the operation pipeline through the ball valve, put a compressed sponge ball into the connector through the ball valve, and use the sponge ball to apply the water-based polyurethane adhesive to the operation pipeline.

[0040] In this embodiment, after the operation pipeline 13 is dried, calculate the dosage according to the pipeline length, then inject a water-based polyurethane adhesive into the connector 5 through the ball valve 9, and let it flow into the operation pipeline 13; put a compressed sponge ball into the connector 5 through the ball valve 9. The outer diameter of the sponge ball is larger than the inner diameter of the operation pipeline 13. Close the ball valve 9, start the gas source, and use a pneumatic method to push the sponge ball to apply the water-based polyurethane adhesive to the inner wall in the pipeline 13, and then recover the flowing water-based polyurethane adhesive and the sponge ball from another lower outlet of the operation pipeline 13. Repeat the same operation several times to evenly apply the water-based polyurethane adhesive to the inner wall of the operation pipeline 13. Do not heat the gas source and continuously ventilate and dry the operation pipeline 13 for 15 - 30 minutes.

[0041] Step Six: Pass the sealed liner pipe in the sealed pipe storage bin through the support cylinder and the connector. The sealed liner pipe is sleeved on the lip through stretching and flipping, and connect the sealed liner pipe to the operation pipeline.

[0042] In this embodiment, a matching sealing liner 1 is selected according to the length and inner diameter size specification of the pipeline 13, and one end of it is blocked by hot melting or bundling. In actual application, first remove the inner liner repair machine, open the upper cover of the sealing pipe storage bin 2, install the coiled sealing liner 1 through the reel, and one end of the outer side of the sealing liner 1 is taken out from the support cylinder 7 and the connector 5 of the inner liner repair machine. After the material of the sealing liner 1 is stretched and turned over, it is sleeved on the connector lip 6, and then reinstall the inner liner repair machine through the first flange 15.

[0043] Step 7: Start the air source and continuously blow air into the support cylinder. The sealing liner rolls, expands and moves from the inside to the outside in the working pipeline. The sealing liner is positioned and tightly attached to the working pipeline through the waterborne polyurethane adhesive, and the edge of the sealing liner is pressed and installed in the sealing groove of the first flange to complete the operation.

[0044] In this embodiment, start the air source, and the compressed gas is pressurized between the sealing liner 1 and the inner wall of the equipment, pushing the sealing liner 1 to roll, expand and move from the inside to the outside into the working pipeline 13. The pipe material rolled out from the inside contacts the pre-surface-dried waterborne polyurethane adhesive on the inner wall of the working pipeline 13, forming a preliminary bonding state and positioning. The original outer wall of the sealing liner 1 is rolled into the inner wall in a certain compressed state, forming an outward supporting effect on the material on the other side turned from the inside to the outside, making the whole sealing liner 1 present an outward tight-fitting effect; continuously press air into the support cylinder 7 until the other end of the sealing liner 1 rolls out from the other side outlet of the working pipeline 13, and then continuously maintain the air pressure state for 2 - 3 hours to realize the complete adhesion of the sealing liner 1 to the inner wall of the working pipeline 13; relieve the pressure inside the inner liner repair machine and remove it, cut, stretch and trim the edge of the sealing liner 1, and press it and install it in the sealing groove area clamped by the first flange 15 to complete the operation.

[0045] In actual application, if the edge of the sealing liner 1 cannot be tightly pressed, a sealing pipe compression ring 18 can be selected to be embedded in the port area between the working pipeline 13 and the first flange 15 to tightly press the sealing liner 1, and then the pipeline can be restored for use.

[0046] In this operation method, the waterborne polyurethane rust stabilizer is a closed protection measure for the rust-damaged area inside the pipeline. Its purpose is to avoid the thinning of the old pipeline wall due to rust removal, which is easy to break. The polyurethane material can form a good combination with the rust solids. Although it cannot completely block the corrosion leakage points, it can maintain the thickness and structural strength of the pipe wall, avoid large-area continuous breakage, and extend the service life of the pipeline.

[0047] In practical applications, the components of the waterborne polyurethane rust stabilizer in parts by mass are as follows: 70 - 80 parts of waterborne polyurethane / modified epoxy resin emulsion; 20 - 25 parts of iron-titanium anti-rust pigment; 8 - 10 parts of silica; 0.8 - 1 part of composite bentonite; 1 - 1.5 parts of W6038 dispersant; 0.8 - 1 part of W203 wetting agent; 0.5 part of W4002 defoamer; 0.5 part of sodium benzoate; 3 - 5 parts of ethylene glycol butyl ether acetate; 0.5 part of silane coupling agent; 0.5 - 1 part of zinc powder; The preparation process of the above materials includes: adding iron-titanium anti-rust pigment to the waterborne polyurethane / modified epoxy resin emulsion and continuously stirring for 10 - 15 min, then adding silica, composite bentonite, W6038, and W203 and continuously stirring for 10 - 15 min, and then adding the remaining part, and continuously stirring for 20 min and then storing it in a sealed manner.

[0048] For different seasons, the fluidity of this material at room temperature varies. Preferably, the mass fraction of the waterborne polyurethane / modified epoxy resin emulsion can be increased by 60 - 80%. The coating thickness in the pipeline should be controlled between 0.2 - 0.5 mm. To control the coating effect, there is no need to increase the gas source temperature during drying to avoid cracks in the coating.

[0049] The above description of the waterborne polyurethane rust stabilizer is only a preferred embodiment of the present invention and is not used to limit the present invention. For those skilled in the art, various changes and modifications can be made to the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

[0050] In addition, in this embodiment, the waterborne polyurethane adhesive is a waterborne epoxy resin adhesive, which is an adhesive that can achieve good adhesion between the material of the sealing liner 1 and the pipe wall structure after the waterborne polyurethane rust stabilizer hardens, has good adaptability, and can be optimized and selected according to indicators. No index description is made here.

[0051] The pipeline inner liner repair machine and operation method provided by the present invention are used to lay a liner inside a leaking pipeline to solve the problem of pipeline leakage. It solves the problem that open-flame operations using electric welding cannot be carried out in an explosion-proof environment, especially suitable for situations where the pipeline is in a concealed area such as equipment or the ground and direct contact operations cannot be directly carried out. Nitrogen or air is used in combination during the device treatment process, and there are no safety and environmental protection risks during the device operation process. For inner liners made of different flexible rubber materials, pneumatic continuous flipping laying and pasting operations are adopted. The operation propulsion speed is fast, the unfolding structure and stress state of the inner liner are evenly distributed, it is firmly bonded to the pipe wall, and it is not easily damaged and leaked after bearing pressure. A water-based polyurethane rust stabilizer is used to seal and solidify the inner wall of the pipeline with a relatively serious rust condition, which can increase the pipeline strength, avoid the aggravation of the corrosion and peeling of the pipe material, and greatly extend the service life of the pipeline. In summary, the operation method of laying a flexible inner liner inside the pipeline using the inner liner repair machine to repair pipeline leakage has a wide application prospect in the petrochemical field.

[0052] The above embodiments are only used to illustrate the present invention and are not intended to limit the present invention. Those of ordinary skill in the relevant technical fields can also make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions also belong to the scope of the present invention. The patent protection scope of the present invention shall be defined by the claims.

Claims

1. A pipeline inner lining repair machine in an explosion-proof environment, characterized in that, Comprising: A sealed pipe storage bin (2), inside which a coiled sealed liner (1) is stored. The lower end of the sealed pipe storage bin (2) communicates with a support cylinder (7). On both sides of the support cylinder (7), a gas pipe joint (3) and a connector (5) are respectively communicated. Inside the support cylinder (7), a gas heater (4) is installed. The gas heater (4) is connected to the gas pipe joint (3), and the other side of the gas pipe joint (3) is connected to an external gas pipe assembly (14). One end of the gas heater (4) is connected to a heating control assembly (12). The other end of the connector (5) is connected to a lip (6), and the lip (6) is connected to an operation pipeline (13). A ball valve (9) is installed at the top of the connector (5), and a flange plate (8) is installed outside the connector (5). The flange plate (8) is connected to a first flange (15), and the first flange (15) is connected to a second flange (17). The operation pipeline (13) is installed inside a pressure vessel (19).

2. The pipeline inner liner repair machine in an explosion-proof environment according to claim 1, wherein The sealed pipe storage bin (2) is a cylindrical bin body. A detachable seal cover is provided at the top of the sealed pipe storage bin (2). A horizontal shaft hole is provided at the center of the sealed pipe storage bin (2). A reel is inserted into the sealed pipe storage bin (2) through the horizontal shaft hole, and the sealed liner (1) is wound around the outside of the reel.

3. The pipeline inner liner repair machine in an explosion-proof environment according to claim 1, characterized in that An internal channel is provided in the middle of the gas heater (4). The gas heater (4) is connected to the gas pipe joint (3) through the internal channel, and gas can be introduced into the internal channel for heating.

4. The pipeline inner liner repair machine in an explosion-proof environment according to claim 1, wherein, The heating control assembly (12) is installed outside the support cylinder (7). The heating control assembly (12) includes a heating controller and a cable. The heating controller is connected to one end of the gas heater (4), and the other end of the heating controller is connected to the cable.

5. The pipeline inner liner repair machine in an explosion-proof environment according to claim 1, wherein, The external gas pipe assembly (14) includes a gas pipe and a quick connector. The two sides of the gas pipe are respectively connected to the gas pipe joint (3) and the quick connector, and the gas pipe is connected to a gas source through the quick connector.

6. The pipeline inner liner repair machine in an explosion-proof environment according to claim 1, wherein, The connector (5) installs the ball valve (9) through a short joint (10), and a handle (11) is provided on the ball valve (9).

7. The pipeline inner liner repair machine in an explosion-proof environment according to claim 1, characterized in that, The flange plate (8) fixes the first flange (15) through bolts (16), and the first flange (15) fixes the second flange (17) through bolts (16). The diameter of the first flange (15) is larger than that of the second flange (17). A sealing groove is provided inside the first flange (15), and the sealed liner (1) is installed inside the sealing groove. The outside of the groove opening of the sealing groove is the pipe head of the sealed liner (1). A sealed pipe pressing ring (18) is embedded between the port of the first flange (15) and the operation pipeline (13).

8. An operation method of a pipeline inner lining repair machine in an explosion-proof environment proposed based on any one of claims 1 to 7, characterized in that, Comprising: Step S1: Stop the production of the pressure vessel with leakage problems, evacuate the medium, purge the pipeline with nitrogen, connect the first flange to the connector and the flange plate respectively, and fix the first flange to the operation pipeline through bolts; Step S2: Connect the ball valve installed on the connector in step S1 to a hot water source, and perform degreasing operation on the operation pipeline through the hot water source; Step S3: After completing the degreasing operation in Step S2, connect the air pipe joint to the air source through the external air pipe assembly, and connect the heating control assembly to the power distribution line. Then, use the air source to dry the working pipeline. Step S4: After completing the drying process in Step S3, close the air source and the heating control assembly, open the ball valve, inject a stabilizing agent into the working pipeline through the ball valve, put a compressed sponge ball into the connector through the ball valve, and use the sponge ball to apply the stabilizing agent to the working pipeline. Step S5: After completing the stabilizing agent application in Step S4, inject a waterborne polyurethane adhesive into the working pipeline through the ball valve, put a compressed sponge ball into the connector through the ball valve, and use the sponge ball to apply the waterborne polyurethane adhesive to the working pipeline. Step S6: Pass the sealing liner in the sealing pipe storage bin through the support cylinder and the connector. The sealing liner is sleeved on the lip through stretching and flipping, and connect the sealing liner to the working pipeline. Step S7: Start the air source and continuously blow air into the support cylinder. The sealing liner rolls and expands from the inside to the outside in the working pipeline. The sealing liner is positioned and tightly attached to the working pipeline through the waterborne polyurethane adhesive in Step S5, and the edge of the sealing liner is pressed and installed in the sealing groove of the first flange to complete the operation.

9. According to the operation method described in Claim 8, in Step S4, the stabilizing agent seals and protects the rust-damaged area inside the working pipeline (13), and the stabilizing agent includes a waterborne polyurethane rust stabilizing agent.

10. According to the operation method described in Claim 8, in Step S5, the waterborne polyurethane adhesive is a waterborne epoxy resin adhesive.

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