Pipeline corrosion insulation and electric heat tracing integrated construction method

Abstract

This invention discloses an integrated construction method for pipeline corrosion protection, heat insulation, and electric heat tracing, comprising the following steps: Step S1, pipeline surface treatment; Step S2, anti-corrosion coating; Step S3, installation of π-shaped stainless steel buckles; Step S4, application of heat-conducting oil; Step S5, circumferential tightening: using stainless steel bolts to lock and fix at designed intervals; Step S6, embedding the heat tracing cable: passing the electric heat tracing cable through the slit at the top of the π-shaped stainless steel buckle into the heat-conducting groove; Step S7, construction of the heat insulation layer; Step S8, installation of the outer protective layer: using quick-connect clips for connection; Step S9, resistance testing; Step S10, hot-state acceptance: in this solution, the heat tracing cable and the anti-corrosion layer are physically isolated through aluminum alloy heat tracing cable and heat-conducting oil, completely avoiding direct baking of the anti-corrosion layer by the high temperature of heat tracing, increasing the service life of the anti-corrosion layer by ≥1.5 times, and extending the overall protection cycle of the pipeline.

Description

Technical Field

[0001] This invention relates to the field of industrial pipeline protection technology, and in particular to an integrated construction method for pipeline corrosion protection, heat insulation and electric heat tracing. Background Technology

[0002] In the fields of pipeline heat tracing, insulation, and corrosion protection, especially in the application of various industrial and marine pipelines, the core technical problem that urgently needs to be solved is that the existing pipeline heat tracing, corrosion protection, insulation, and maintainability functions cannot be integrated. Specifically, the contact between the electric heating cable and the pipeline corrosion protection layer leads to accelerated aging of the corrosion protection layer, the fixed structure has an excessively large thermal bridge area, the integrity of the insulation layer is damaged, resulting in increased cold loss, and the maintenance of the heating cable is inconvenient and costly. Moreover, the existing technology has not formed a system-level solution and cannot fundamentally solve the above pain points.

[0003] Currently, several related technical solutions exist in the industry. Among them, the detachable pipe insulation shell (CN215386568U) uses a snap-on stainless steel shell, offering the advantage of easy maintenance. However, this solution lacks an anti-corrosion layer and heat tracing function, failing to meet the dual requirements of pipe heat tracing and corrosion protection. A method and system for monitoring the heating current of a self-regulating electric heating tape (CN202511093086.1) uses the signal-to-noise ratio of current data to obtain the current fault coefficient at the current moment, enabling real-time fault monitoring of the electric heating tape current. It also involves the electric heat tracing structure and construction methods. However, this solution does not address the integrated structure and maintainability of corrosion protection, insulation, and heat tracing, failing to solve core issues such as anti-corrosion layer aging and excessive thermal bridge area. The national standard for self-regulating electric heating tape (GB / T...) The document (19835-2015) only specifies the selection and installation of heat tracing cables, without addressing the integrated anti-corrosion and heat insulation structure and construction methods, thus failing to provide technical guidance for the synergistic realization of pipeline heat tracing, corrosion protection, and heat insulation; a device for laying electric heat tracing cables for marine fuel pipelines and its usage method (CN202511152220.0) involves adhesively fixing "Ω"-shaped stainless steel clamps to the outer wall of the marine fuel pipeline, with the heat tracing cable embedded in the inner cavity of the clamps. While this solution achieves the fixing and laying of the heat tracing cable, However, it has obvious drawbacks. The clamp base plate remains in direct contact with the anti-corrosion primer, accelerating paint aging. Furthermore, the clamps are fixed at discrete points, resulting in a high thermal bridge area. There is no integrated insulation layer design, requiring secondary insulation construction, making wire threading and opening holes unavoidable. Additionally, the clamps cannot be repeatedly opened after being flipped, making it impossible to achieve "replaceable individual heating cables," leading to inconvenient maintenance. (A method for preventing the movement of electric heating cables and a method for preventing the movement of electric heating cables (CN202510231248.7, 2025-04-05)) (Public) A method involves hot-melt extrusion of "T"-shaped positioning ribs on both sides of the heat tracing cable to prevent axial movement of the cable by adhesive bonding to the pipe surface. While this solution solves the problem of cable movement, the positioning ribs are in contact with the pipe via adhesive bonding, which can easily soften and fail over long-term operation. Furthermore, the T-ribs are protruding structures, requiring the insulation layer to be grooved to avoid them, creating a continuous line contact thermal bridge and increasing heat loss. Additionally, the solution does not address the aging problem of the anti-corrosion layer, nor does it provide an integrated construction plan for the insulation and outer protective layer. Once the adhesive fails, the entire insulation layer must be removed and re-adhesive applied, resulting in extremely poor maintainability.

[0004] In summary, existing technologies generally suffer from problems such as direct contact between the electric heating cable and the anti-corrosion layer or only an adhesive layer. The thermal cycle during operation accelerates the powdering of the anti-corrosion coating, shortening its lifespan by 30-50%. Furthermore, the fixing structures, such as Ω clamps and T ribs, are "point-to-line" contacts, with thermal bridge areas reaching 7-15%, far exceeding the theoretical limit. At the same time, the insulation layer needs to be grooved and perforated on-site, which disrupts its continuous closed-cell structure, resulting in additional cold loss. When replacing the heating cable, all insulation and outer protection must be removed, leading to high maintenance costs and long construction periods. Summary of the Invention

[0005] The purpose of this invention is to provide an integrated construction method for pipeline anti-corrosion insulation and electric heat tracing, addressing the aforementioned shortcomings. This method solves the problems in existing technologies where the electric heat tracing cable is in direct contact with the anti-corrosion layer or only separated by an adhesive layer, leading to accelerated powdering of the anti-corrosion coating during thermal cycling and shortening its lifespan by 30-50%. Additionally, the insulation layer requires on-site grooving and perforation, disrupting its continuous closed-cell structure and resulting in additional cold loss. Furthermore, replacing the heat tracing cable requires the complete removal of insulation and outer protection, resulting in high maintenance costs and long construction periods.

[0006] This invention is achieved through the following scheme: The integrated construction method for pipeline corrosion protection, heat insulation, and electric heat tracing includes the following steps: Step S1, pipe surface treatment; Step S2, anti-corrosion coating: Step S3, Install the π-shaped stainless steel buckle: Insert the π-shaped stainless steel buckle into the round hole of the aluminum alloy heat conductor. Step S4, heat transfer oil coating: pre-brush heat transfer oil on the inner surface of the aluminum alloy heat transfer tape, and immediately apply the heat transfer tape to the surface of the anti-corrosion layer after the coating is completed. Step S5, Circumferential tightening: Use stainless steel bolts to tighten and fix at the designed intervals to ensure that the aluminum alloy heat conductor is tightly attached to the pipe surface; Step S6, embedding the heating cable: pass the electric heating cable through the slit at the top of the π-shaped stainless steel buckle into the heat conduction groove; Step S7, Insulation layer construction: The insulation layer is constructed using a layered staggered joint laying method; Step S8, Outer Sheath Installation: Complete the outer sheath installation according to the design requirements, ensuring that the maintenance section is removable, and use quick-release buckles for connection; Step S9, Resistance test: The resistance between the heating cable and the grounding is tested; Step S10, Hot Acceptance: After the system reaches a thermally stable state by powering on, use an infrared thermal imager to detect the temperature rise on the pipe surface and accept whether the construction quality meets the design requirements.

[0007] In step S1, sandblasting is used to treat the surface of the pipe to remove impurities such as rust and oil. In step S2, the anti-corrosion coating is applied according to the wet film thickness and dry film thickness standards required by the design.

[0008] In step S3, the π-shaped stainless steel buckle specifically includes a first connector, a second connector, and a third connector. The second connector and the third connector are arranged in parallel, and the ends of the second connector and the third connector are both perpendicular to the first connector. The first connector, the second connector, and the third connector enclose a heat-conducting groove structure that supports and limits the heat tracing tape.

[0009] In step S3, the aluminum alloy conductive tape is specifically an aluminum alloy strip with a large number of perforations, the size of which is not smaller than the size of the ends of the second and third connectors; so that the ends of the second and third connectors can pass through the aluminum alloy conductive tape.

[0010] The aluminum alloy conductive tape has a width of 50-100mm and a thickness of 1.5mm, and adopts a combination of axial and circumferential arrangement.

[0011] In step S3, specifically, the first connector is set parallel to the platform of the aluminum alloy heat tracing cable, while the second and third connectors are passed through the perforations of the aluminum alloy heat tracing cable, and the first connector is spaced at a predetermined distance from the surface of the aluminum alloy heat tracing cable. Then, the ends of the second and third connectors are reversed and passed back into the space where the first connector is located, so that the π-shaped stainless steel buckle is connected to the aluminum alloy heat tracing cable as a whole. At the same time, the sidewalls of the aluminum alloy heat tracing cable, as well as the sidewalls of the first, second, and third connectors, form a cavity structure that restricts the heat tracing cable.

[0012] In step S3, the distance between the heat conduction groove and the anti-corrosion layer is 3mm, and the tensile strength of the π-shaped stainless steel buckle flange locking is ≥500 N; In step S4, specifically, the coating thickness of the dimethyl silicone oil type heat transfer oil is 0.1 to 0.2 mm, and it is uniformly filled between the aluminum alloy heat transfer tape and the anti-corrosion layer.

[0013] In step S5, circumferential tightening is performed: circumferential locking elements are spaced apart on the aluminum alloy conductive tape, and the circumferential locking elements surround the pipe. Specifically, the circumferential locking elements include stainless steel bolts, locking holes, and connecting strips; the connecting strips surround the pipe, and the locking holes are respectively set on the connecting strips. The connecting strips are connected by stainless steel bolts and nuts, so that the aluminum alloy conductive tape is in close contact with the pipe surface.

[0014] In step S8, a 200mm wide detachable maintenance section is reserved every 2 to 3 meters.

[0015] In step S9, if the resistance test fails, the heat tracing cable needs to be replaced. The specific method for replacing the heat tracing cable includes: when the heat tracing cable is pulled out, the thin steel wire is fixed at the far end of the heat tracing cable. The thin steel wire replaces the original installation position of the heat tracing cable as the heat tracing cable is pulled out; after the heat tracing cable is updated or repaired, the thin steel wire is pulled out from the far end until the heat tracing cable is reset.

[0016] In summary, due to the adoption of the above technical solution, the beneficial effects of this solution are: 1. The heat tracing tape and the anti-corrosion layer are physically isolated by aluminum alloy heat-conducting tape and heat-conducting oil, which completely avoids the direct baking of the anti-corrosion layer by the high temperature of heat tracing, increases the service life of the anti-corrosion layer by ≥1.5 times, and extends the overall protection cycle of the pipeline. 2. The insulation layer does not require grooving or drilling during construction, preserving its continuous closed-cell structure. Thermal bridge loss is reduced by more than 20%, significantly improving the insulation effect and reducing energy consumption. 3. During maintenance, only the reserved 200mm wide outer protective layer maintenance section needs to be removed, and the heat tracing cable can be pulled out as a whole through the narrow gap at the top of the π-shaped stainless steel buckle. There is no need to damage the insulation layer and anti-corrosion layer, saving labor costs and maintenance time. 4. The structural design is simple and reasonable, and the core main materials are all commercially available standard profiles, making procurement convenient; the "one-time construction, one-time acceptance" system-level construction method shortens the on-site construction period and reduces the overall cost by 20% to 25%, which has significant economic advantages. Attached Figure Description

[0017] Figure 1 This is a partial cross-sectional view of the aluminum alloy heat-conducting tape after assembly. Figure 2 This is a diagram showing the unfolded shape of the aluminum alloy conductive tape. Figure 3 Diagram showing the circumferential tensioning of the aluminum alloy heat-conducting tape; Figure 4 This is a flowchart of the construction process. Reference numerals: 1. π-shaped stainless steel buckle; 2. Aluminum alloy heat conduction tape; 3. Pipe; 4. Heat conduction oil; 5. Heat tracing tape; 6. Stainless steel bolt; 7. Locking hole; 8. Connecting strip; 9. Perforation; 10. Heat conduction groove; 11. First connector; 12. Second connector; 13. Third connector. Detailed Implementation

[0018] All features disclosed in this specification, or all steps in all disclosed methods or processes, may be combined in any way, except for mutually exclusive features and / or steps.

[0019] Any feature disclosed in this specification (including any appended claims and abstract) may be replaced by other equivalent or similar features, unless specifically stated otherwise. That is, unless specifically stated otherwise, each feature is merely one example of a series of equivalent or similar features.

[0020] In the description of this invention, it should be understood that the terms "upper," "lower," "left," "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a predetermined orientation, or be constructed and operated in a predetermined orientation. Therefore, they should not be construed as limitations on this invention.

[0021] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature.

[0022] Example 1 like Figures 1-4 As shown, the present invention provides a technical solution: The integrated construction method for pipeline corrosion protection, heat insulation, and electric heat tracing includes the following steps: Step S1, surface treatment of pipe 3: The surface of pipe 3 is treated with sandblasting to remove impurities such as rust and oil, ensuring the adhesion of the anti-corrosion layer. Step S2, Anti-corrosion coating: Complete the anti-corrosion coating application according to the wet film thickness and dry film thickness standards required by the design, ensuring that the coating is uniform and undamaged; Step S3, Install π-shaped stainless steel buckle 1: Insert the two legs of π-shaped stainless steel buckle 1 into the round holes of aluminum alloy heat conductor 2, and flatten and lock it after turning the edges at 90° to ensure a firm installation; Step S4, coating of heat transfer oil 4: pre-brush dimethyl silicone oil type heat transfer oil 4 on the inner surface of aluminum alloy heat transfer tape 2, and immediately apply the heat transfer tape to the surface of the anti-corrosion layer after the coating is completed to ensure the heat conduction coupling effect. Step S5, circumferential tightening: Use stainless steel bolts 6 to tighten and fix at the designed intervals to ensure that the aluminum alloy heat conduction tape 2 and the surface of the pipe 3 are tightly attached; Step S6, embedding the heating cable 5: pass the electric heating cable 5 through the slit at the top of the π-shaped stainless steel buckle 1 into the heat conduction groove 10, ensuring that the installation of the heating cable 5 is uninterrupted and tightly fitted. Step S7, Insulation layer construction: The insulation layer is constructed using a layered staggered laying method, and the layers are fixed by a combination of high-temperature resistant adhesive nails and steel strips to ensure the stability of the insulation structure. Step S8, Outer Sheath Installation: Complete the outer sheath installation according to the design requirements, ensuring the removable function of the reserved maintenance section. Use quick-release buckles for connection to improve construction and maintenance efficiency. Specifically, select the outer sheath material according to the usage environment and design requirements, and reserve a 200mm wide removable maintenance section every 2-3 meters to facilitate later maintenance operations.

[0023] Step S9, Resistance test: Test the resistance between the heating cable 5 and the ground to ensure that the electrical safety performance meets the standards; Step S10, Hot Acceptance: After the system reaches a thermally stable state by powering on, use an infrared thermal imager to detect the temperature rise on the surface of pipe 3 and accept whether the construction quality meets the design requirements.

[0024] In step S3, the π-shaped stainless steel buckle 1 may specifically include a first connector 11, a second connector 12, and a third connector 13. The second connector 12 and the third connector 13 are arranged in parallel, and the ends of the second connector 12 and the third connector 13 are both perpendicular to the first connector 11. The first connector 11, the second connector 12, and the third connector 13 enclose and form a heat-conducting groove 10 structure that supports and limits the heat tracing tape 5. In step S3, the aluminum alloy heat conductor 2 can specifically be an aluminum alloy strip with a large number of perforations 9, the size of the perforations 9 being not smaller than the size of the ends of the second connector 12 and the third connector 13; so that the ends of the second connector 12 and the third connector 13 can pass through the aluminum alloy heat conductor 2. Specifically, aluminum alloy heat conduction cable 2: 50-100mm wide and 1.5mm thick, arranged in a combination of axial and circumferential directions; evenly distributed circular holes along the centerline of the heat conduction cable. In step S3, specifically, the first connector 11 is set parallel to the platform of the aluminum alloy heat-conducting cable 2, while the second connector 12 and the third connector 13 are passed through the perforation 9 of the aluminum alloy heat-conducting cable 2, and the first connector 11 is spaced at a predetermined distance from the surface of the aluminum alloy heat-conducting cable 2. Then, the ends of the second connector 12 and the third connector 13 are reversed and passed back into the space where the first connector 11 is located, so that the π-shaped stainless steel buckle 1 is connected to the aluminum alloy heat-conducting cable 2 as a whole. At the same time, the sidewalls of the aluminum alloy heat-conducting cable 2, as well as the sidewalls of the first connector 11, the second connector 12 and the third connector 13, form a cavity structure that restricts the heat-tracing cable 5.

[0025] In step S3, the distance between the heat-conducting groove 10 and the anti-corrosion layer is 3mm, thus achieving a balance between physical isolation and efficient heat conduction. The thermal conductivity of the aluminum alloy heat-conducting tape 2 is ≥230 W / (m). K), thus ensuring thermal conductivity.

[0026] In step S3, the tensile strength of the π-shaped stainless steel buckle 1 flange locking is ≥500 N, which ensures the reliability of the connection.

[0027] In step S4, specifically, the coating thickness of the dimethyl silicone oil type heat transfer oil 4 is 0.1 to 0.2 mm, which is uniformly filled between the aluminum alloy heat transfer tape 2 and the anti-corrosion layer to reduce contact thermal resistance and improve heat transfer efficiency. In step S5, circumferential tightening is performed: circumferential locking elements are spaced apart on the aluminum alloy conductive tape 2, and the annular locking elements surround the pipe 3. Specifically, the annular locking elements may include stainless steel bolts 6, locking holes 7, and connecting strips 8; the connecting strips 8 surround the pipe 3, and the locking holes 7 are respectively provided on the connecting strips 8. The connecting strips 8 are connected by stainless steel bolts 6 and nuts, so that the aluminum alloy conductive tape 2 is in close contact with the surface of the pipe 3.

[0028] In step S9, if the resistance test fails, the heat tracing cable 5 needs to be replaced. The specific method for replacing the heat tracing cable 5 includes: when the heat tracing cable 5 is pulled out, the thin steel wire fixed at the far end of the heat tracing cable 5 is removed, and the thin steel wire replaces the original installation position of the heat tracing cable 5; after the heat tracing cable 5 is updated or repaired, the thin steel wire is pulled out from the far end until the heat tracing cable 5 is reset. In this solution, during maintenance, only the reserved 200mm wide outer protective layer maintenance section needs to be removed, and the heat tracing cable 5 can be pulled out as a whole through the slit at the top of the π-shaped stainless steel buckle 1 without damaging the insulation layer and anti-corrosion layer, saving labor costs and maintenance time.

[0029] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for integrated construction of pipeline anticorrosion, thermal insulation and electric tracing, characterized in that, Includes the following steps: Step S1, surface treatment of pipe (3); Step S2, anti-corrosion coating: Step S3, Install the π-shaped stainless steel buckle (1): Insert the π-shaped stainless steel buckle (1) into the round hole of the aluminum alloy heat conductor (2); Step S4, heat transfer oil (4) coating: pre-brush heat transfer oil (4) on the inner surface of the aluminum alloy heat transfer tape (2), and immediately attach the heat transfer tape to the surface of the anti-corrosion layer after the coating is completed. Step S5, circumferential tightening: Use stainless steel bolts (6) to tighten and fix at the designed interval to ensure that the aluminum alloy heat conductor (2) and the surface of the pipe (3) are tightly attached; Step S6, embedding the heating cable (5): pass the electric heating cable (5) through the slit at the top of the π-shaped stainless steel buckle (1) into the heat conduction groove (10); Step S7, Insulation layer construction: The insulation layer is constructed using a layered staggered joint laying method; Step S8, Outer Sheath Installation: Complete the outer sheath installation according to the design requirements, ensuring that the maintenance section is removable, and use quick-release buckles for connection; Step S9, Resistance test: The resistance between the heating cable (5) and the ground is tested; Step S10, hot acceptance: After the system reaches a thermally stable state by powering on, use an infrared thermal imager to detect the temperature rise on the surface of the pipe (3) and accept whether the construction quality meets the design requirements.

2. The method for integrated construction of pipe anticorrosion, thermal and electric tracing according to claim 1, characterized in that: In step S1, sandblasting is used to treat the surface of the pipe (3) to remove rust, oil and other impurities; In step S2, the anti-corrosion coating is applied according to the wet film thickness and dry film thickness standards required by the design.

3. The method for integrated construction of pipe anticorrosion, thermal and electric tracing according to claim 2, characterized in that: In step S3, the π-shaped stainless steel buckle (1) specifically includes a first connector (11), a second connector (12) and a third connector (13). The second connector (12) and the third connector (13) are arranged in parallel, and the ends of the second connector (12) and the third connector (13) are both perpendicular to the first connector (11). The first connector (11), the second connector (12) and the third connector (13) enclose and form a heat-conducting groove (10) structure that supports and limits the heat tracing tape (5).

4. The integrated construction method for pipeline corrosion protection, heat insulation, and electric heat tracing according to claim 3, characterized in that: In step S3, the aluminum alloy conductive tape (2) is specifically an aluminum alloy strip with a large number of perforations (9), the size of which is not less than the size of the ends of the second connector (12) and the third connector (13); so that the ends of the second connector (12) and the third connector (13) can pass through the aluminum alloy conductive tape (2).

5. The integrated construction method for pipeline corrosion protection, heat insulation, and electric heat tracing according to claim 4, characterized in that: The aluminum alloy heat conductor (2) has a width of 50-100mm and a thickness of 1.5mm, and adopts an axial and circumferential arrangement.

6. The integrated construction method for pipeline corrosion protection, heat insulation, and electric heat tracing according to claim 5, characterized in that: In step S3, specifically, the first connector (11) is set parallel to the platform of the aluminum alloy heat conductor (2), while the second connector (12) and the third connector (13) are passed through the perforation (9) of the aluminum alloy heat conductor (2), and the first connector (11) is spaced at a predetermined distance from the surface of the aluminum alloy heat conductor (2). Then, the ends of the second connector (12) and the third connector (13) are reversed and passed back into the space where the first connector (11) is located, so that the π-shaped stainless steel buckle (1) is connected to the aluminum alloy heat conductor (2) as a whole. At the same time, the side wall of the aluminum alloy heat conductor (2), as well as the side walls of the first connector (11), the second connector (12) and the third connector (13), form a cavity structure for restricting the heat tracing cable (5).

7. The integrated construction method for pipeline corrosion protection, heat insulation, and electric heat tracing according to claim 6, characterized in that: In step S3, the distance between the heat conduction groove (10) and the anti-corrosion layer is 3mm, and the tensile strength of the π-shaped stainless steel buckle (1) for flange locking is ≥500N; In step S4, specifically, the coating thickness of the dimethyl silicone oil type heat transfer oil (4) is 0.1 to 0.2 mm, and it is uniformly filled between the aluminum alloy heat transfer tape (2) and the anti-corrosion layer.

8. The integrated construction method for pipeline corrosion protection, heat insulation, and electric heat tracing according to claim 7, characterized in that: In step S5, circumferential tightening is performed: circumferential locking elements are spaced apart on the aluminum alloy conductive tape (2), and the circumferential locking elements surround the pipe (3). Specifically, the circumferential locking elements include stainless steel bolts (6), locking holes (7), and connecting strips (8); the connecting strips (8) surround the pipe (3), and the locking holes (7) are respectively set on the connecting strips (8). The connecting strips (8) are connected by stainless steel bolts (6) and nuts, so that the aluminum alloy conductive tape (2) is in close contact with the surface of the pipe (3).

9. The integrated construction method for pipeline corrosion protection, heat insulation, and electric heat tracing according to claim 8, characterized in that: In step S8, a 200mm wide detachable maintenance section is reserved every 2 to 3 meters.

10. The integrated construction method for pipeline corrosion protection, heat insulation, and electric heat tracing according to claim 9, characterized in that: In step S9, if the resistance test fails, the heat tracing cable (5) needs to be replaced. The specific method for replacing the heat tracing cable (5) includes: when the heat tracing cable (5) is pulled out, the thin steel wire is fixed at the far end of the heat tracing cable (5). The thin steel wire replaces the original installation position of the heat tracing cable (5) as the heat tracing cable (5) is pulled out; after the heat tracing cable (5) is updated or repaired, the thin steel wire is pulled out from the far end until the heat tracing cable (5) is reset.

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