Electric heat tracing installation method and system for fluid conveying and storage equipment

Abstract

The invention provides an electric heat tracing installation method and system for fluid conveying and storage equipment, and the method comprises the steps: laying a heat tracing sleeve on the outer surface of the equipment in advance as a protection channel, enabling an electric heat tracing belt to penetrate through the heat tracing sleeve, and enabling the electric heat tracing belt to penetrate through the heat tracing sleeve; the mechanical protection performance of the electric heat tracing system is effectively enhanced, the external force damage resistance of the electric heat tracing system is remarkably improved, the service life of the electric heat tracing system is remarkably prolonged, more importantly, pluggable installation of the electric heat tracing band is creatively achieved, when the electric heat tracing band needs to be overhauled or replaced, an external heat preservation layer and a protection shell do not need to be damaged, and maintenance is convenient. Operation can be directly completed in the heat tracing sleeve through the junction box, the maintenance process is greatly simplified, the maintenance time is shortened, the maintenance cost and the system shutdown loss are remarkably reduced, the advantages of accurate temperature control and flexible installation of electric heat tracing are reserved, and the maintenance problem of a traditional installation mode is solved.

Description

Technical Field

[0001] This invention relates to the field of fluid transport and storage, and specifically to an electric heat tracing installation method and system for fluid transport and storage equipment. Background Technology

[0002] With the continuous development of industrial technology, the stable operation of fluid transportation and storage systems in complex environments increasingly relies on reliable heat tracing. Especially in northern regions or environments with significant seasonal temperature differences, outdoor pipelines, storage tanks, and other equipment often face the challenge of ambient temperatures not meeting the requirements for media transportation and storage. Effective insulation and heat tracing measures must be taken to maintain the normal state and safe flow of the process media. Currently, commonly used heat tracing methods mainly include internal sheathing heat tracing, external heat tracing pipe heat tracing, heat tracing pipe combined with thermally conductive mortar, and electric heat tracing, each with its own applicable conditions and limitations.

[0003] Although electric heat tracing technology has advantages such as precise temperature control and relatively simple installation, and is widely used in anti-condensation, anti-freezing, and process insulation, it still has significant shortcomings in practical engineering. Currently used electric heat tracing products are often sensitive to external mechanical impacts and are easily damaged. Moreover, the materials are prone to aging after long-term use, leading to a gradual decline in heating performance and a limited service life. Furthermore, in terms of installation, electric heat tracing tape is usually directly wrapped or laid flat on the surface of the equipment being heat-traced, and then covered with an insulation layer and a protective shell. This structure completely encloses the electric heat tracing within the insulation system. Once a fault occurs, the difficulty of maintenance increases significantly. Replacing the electric heat tracing tape after it reaches the end of its service life requires the removal of the external insulation and protective structure, resulting in a large amount of work and high costs, which brings many inconveniences to the long-term stable operation and maintenance of the system.

[0004] Therefore, there is an urgent need for an electric heat tracing installation method and system for fluid transport and storage equipment to solve the above-mentioned technical problems. Summary of the Invention

[0005] In view of the problems existing in the prior art, one of the objectives of the present invention is: In a first aspect, the present invention provides an electric heat tracing installation method for fluid transport and storage equipment, the method comprising the following steps: Pre-installation: Heat tracing sleeves are pre-laid on the outer surface of the fluid transport pipeline or storage container to be heat-traced, forming a continuous heat tracing channel, wherein the heat tracing sleeves are respectively installed at straight pipe sections, elbows, tees and valves. Junction box installation: A junction box is installed at the connection node of the heat tracing sleeve, and the junction box is detachably connected to the heat tracing sleeve; Electric heat tracing installation: The electric heat tracing tape is inserted into the heat tracing sleeve to form a composite heat tracing structure. The internal channel of the heat tracing sleeve is used to accommodate and fix the electric heat tracing tape, and can provide mechanical protection and heat dissipation space for the electric heat tracing tape, so that the heat tracing sleeve, together with the external insulation layer and protective shell of the fluid conveying pipeline, constitute a heat insulation mechanism. Maintenance: When the electric heating cable fails or reaches the end of its service life, the electric heating cable is directly pulled out from inside the heat tracing sleeve and another electric heating cable is inserted.

[0006] In one embodiment, the pre-installation step of the heat tracing sleeve specifically includes: At the straight pipe section, the heat tracing sleeve is laid parallel to the pipeline axis in the lower half of the cross-section of the fluid transport pipeline, and the heat tracing sleeve is set at at least 45° on one side of the bottom of the fluid transport pipeline. At the bend, the heat tracing sleeve is laid along the curvature of the bend, and the heat tracing sleeve is connected to the heat tracing sleeve of the straight pipe section. The heat tracing sleeve is provided on at least one side of the inner bend and the outer bend of the bend. At the tee, the heat tracing sleeve installation method of the straight pipe section continues in the direction of the main pipeline, and the heat tracing sleeve is laid on at least one side of the branch pipeline in the direction of the branch pipeline. At the valve, a heat tracing sleeve that matches the shape of the valve is installed.

[0007] In one embodiment, the pre-installation of the heat tracing sleeve in the storage device specifically includes: For a rectangular storage tank, a plurality of heat tracing sleeves are arranged circumferentially at intervals along the height direction on the outer wall surface of the rectangular storage tank, and a plurality of heat tracing sleeves are arranged horizontally at intervals on the top and bottom surfaces of the rectangular storage tank. For a cylindrical storage tank, multiple heat tracing sleeves are arranged circumferentially at intervals along the height direction on the outer wall surface of the cylindrical storage tank, or multiple heat tracing sleeves are arranged circumferentially on the outer wall surface of a rectangular storage tank, and heat tracing sleeves are arranged radially or in concentric rings on the top and bottom surfaces of the cylindrical storage tank.

[0008] In one embodiment, the junction box installation step specifically includes: Determine the installation location: Based on the laying path of the heat tracing sleeve at the straight pipe section, elbow, tee, and valve of the fluid conveying pipeline, and the arrangement of the heat tracing sleeve on the storage container, pre-set junction box installation points at different connection points of the heat tracing sleeve; Fixing the junction box: The base of the junction box is fixed to the outer surface of the storage container or the fluid delivery pipeline by means of structural adhesive bonding or welding; Connecting the heat tracing sleeve: The heat tracing sleeve is detachably connected to the interface of the junction box via threaded connection, compression fitting connection or quick-connect fitting; Internal treatment: The inside of the junction box is filled with high-temperature resistant insulation material.

[0009] In one embodiment, the size selection of the heat tracing sleeve must meet the following conditions: The inner diameter of the heat tracing sleeve is at least 4 mm larger than the maximum external dimensions of the electric heat tracing cable. Alternatively, the net internal cross-sectional area of ​​the heat tracing sleeve is greater than 140% of the cross-sectional area of ​​the electric heat tracing cable.

[0010] In one implementation, the maintenance steps specifically include: Disconnect the power and confirm that there is no power. Open the corresponding junction box and disconnect the electric tracing tape. Slowly pull out the electric heating tape from one end of the heat tracing sleeve; Inspect the internal condition of the heat tracing sleeve, clean it, and then insert another heat tracing cable. Reconnect and test the performance of the other electric heating tape.

[0011] In one embodiment, an insulation resistance test step is included between the junction box installation step and the maintenance step, which is required to be not less than 20MΩ; Perform a circuit continuity test to ensure that the electric heating tape is connected correctly; Conduct a power-on trial run and monitor whether the temperature of each section meets the design requirements; The initial operating current and temperature data were recorded as a baseline.

[0012] In one embodiment, a sealing step is further included between the junction box installation step and the maintenance step, the sealing step comprising: Sealing of the junction box: A sealing strip or sealant is applied to the mating surface between the junction box body and the cover. Sealing at the connection between the heat tracing sleeve and the junction box: Wrap sealing tape or apply thread sealant at the connection between the heat tracing sleeve and the lock nut or interface of the junction box to ensure the airtightness of the interface. Sealing of the lead wires of the electric heating cable: Use rubber cable plugs or waterproof glands to tighten and seal where the power cord or signal wire of the electric heating cable passes through the junction box wall; Overall system airtightness verification: After all sealing steps are completed, the junction box is subjected to an airtightness or waterproof spray test to verify its sealing effect.

[0013] Secondly, the present invention also provides an electric heat tracing system for implementing the above-mentioned electric heat tracing installation method for fluid transport and storage equipment. The system includes multiple heat tracing sleeves, multiple electric heat tracing cables, multiple junction boxes, an insulation layer, and a protective outer shell. The multiple heat tracing sleeves are respectively installed at straight sections, bends, tees, and storage devices of the pipeline, forming a continuous heat tracing channel. The multiple electric heat tracing cables are inserted inside different heat tracing sleeves. The electric heat tracing cables and the heat tracing sleeves constitute a heat tracing structure. The multiple junction boxes are respectively installed at the connection points of different adjacent heat tracing sleeves. The junction boxes are used for electrical connection and maintenance of the electric heat tracing cables. The insulation layer and the protective outer shell wrap around the outside of the heat tracing sleeves.

[0014] In one embodiment, the electric heat tracing system further includes a temperature control system, which includes temperature sensors and a control unit. The temperature sensors include multiple sensors, which are respectively installed on different heat tracing sleeves. The temperature sensors are used to monitor the temperature in real time, and the control unit can automatically adjust the output power of the electric heat tracing cable according to the monitored temperature and set parameters.

[0015] Compared with the prior art, the advantages of the present invention are that the embodiments of this application provide an electric heat tracing installation method and apparatus for fluid transportation and storage equipment. The electric heat tracing installation method for fluid transportation and storage equipment includes a pre-installation step, a junction box installation step, an electric heat tracing installation step, and a maintenance step. By pre-laying a heat tracing sleeve as a protective channel on the outer surface of the equipment and then inserting the electric heat tracing cable through it, not only is the mechanical protection performance of the electric heat tracing system effectively enhanced, its resistance to external damage and service life significantly improved, but more importantly, it creatively realizes the pluggable installation of the electric heat tracing cable. When the system needs to be repaired or the electric heat tracing cable needs to be replaced, there is no need to damage the external insulation layer and protective shell. The operation can be completed directly through the junction box from the heat tracing sleeve, which greatly simplifies the maintenance process, shortens the repair time, and significantly reduces maintenance costs and system downtime losses. It retains the advantages of precise temperature control and flexible installation of electric heat tracing while overcoming the maintenance difficulties under traditional installation methods. Attached Figure Description Figure 1 A flowchart illustrating an electric heat tracing installation method for a fluid transport and storage device, provided for some embodiments of this application.

[0016] Figure 2 This is a schematic diagram of the installation structure of a fluid transport pipeline for an electric heat tracing installation method for fluid transport and storage equipment, provided for some embodiments of this application.

[0017] Figure 3This is a schematic diagram of the installation structure of a straight pipe section for an electric heat tracing installation method for fluid transport and storage equipment, provided for some embodiments of this application.

[0018] Figure 4 This is a schematic diagram of the installation structure of a horizontal elbow for an electric heat tracing installation method for fluid transport and storage equipment, provided for some embodiments of this application.

[0019] Figure 5 This is a schematic diagram of the installation structure of a vertical elbow in an electric heat tracing installation method for fluid transport and storage equipment, provided for some embodiments of this application.

[0020] Figure 6 This is a schematic diagram of the installation structure of a tee for an electric heat tracing installation method for fluid transport and storage equipment, provided for some embodiments of this application.

[0021] Figure 7 This is a schematic diagram of the valve installation structure for an electric heat tracing installation method for fluid transport and storage equipment, provided for some embodiments of this application.

[0022] Figure 8 This is a cross-sectional view of a valve installed in an electric heat tracing method for a fluid transport and storage device, provided for some embodiments of this application.

[0023] Figure 9 This is a schematic diagram of the installation structure of a rectangular container for an electric heat tracing installation method for fluid transport and storage equipment, provided for some embodiments of this application.

[0024] Figure 10 This is a schematic diagram of the installation structure of a circular container for an electric heat tracing installation method for fluid transport and storage equipment, provided for some embodiments of this application.

[0025] Figure 11 This is a schematic diagram of the installation structure of a maintenance box in the middle of a flow transport pipeline for an electric heat tracing installation method for fluid transport and storage equipment, provided for some embodiments of this application.

[0026] Figure 12 This is a schematic diagram of the installation structure of a maintenance box for a fluid transport pipeline terminal, which is provided in some embodiments of this application for an electric heat tracing installation method for fluid transport and storage equipment.

[0027] Figure 13 This is a schematic diagram of the installation structure of a maintenance box in the middle part of a fluid transport and storage device, provided in some embodiments of this application for an electric heat tracing installation method for fluid transport and storage devices.

[0028] Figure 14This is a schematic diagram of the installation structure of a maintenance box for a storage device terminal in an electric heat tracing installation method for fluid transport and storage equipment, provided for some embodiments of this application.

[0029] Figure label: 1. Heat tracing sleeve; 2. Electric heat tracing tape; 3. Junction box; 4. Housing; 5. Terminal block; 6. Conduit; 7. Cable. Detailed Implementation

[0030] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0031] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0032] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0033] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or a joint; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0034] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0035] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0036] The invention will now be further described with reference to the accompanying drawings.

[0037] Firstly, see Figures 1-2 An embodiment of this application provides an electric heat tracing installation method for fluid transport and storage equipment, the method comprising the following steps: Pre-installation: Heat tracing sleeve 1 is pre-laid on the outer surface of the fluid transport pipeline or storage container to be heat-traced, forming a continuous heat tracing channel. Heat tracing sleeve 1 is respectively installed at straight pipe sections, elbows, tees and valves. Junction box 3 installation: Junction box 3 is installed at the connection node where heat tracing sleeve 1 is laid. Junction box 3 is detachably connected to heat tracing sleeve 1. Electric heat tracing installation: The electric heat tracing tape 2 is inserted into the heat tracing sleeve 1 to form a composite heat tracing structure. The internal channel of the heat tracing sleeve 1 is used to accommodate and fix the electric heat tracing tape 2, and can provide mechanical protection and heat dissipation space for the electric heat tracing tape 2, so that the heat tracing sleeve 1, together with the external insulation layer of the fluid conveying pipeline and the protective shell 4, constitute a heat insulation mechanism. Maintenance: When the electric heating cable 2 fails or reaches the end of its service life, the electric heating cable 2 is directly pulled out from inside the heat tracing sleeve 1 and another electric heating cable 2 is inserted.

[0038] The electric heat tracing installation method for fluid transport and storage equipment provided in this application embodiment, by pre-laying a heat tracing sleeve 1 as a protective channel on the outer surface of the equipment and then inserting the electric heat tracing cable 2 through it, not only effectively enhances the mechanical protection performance of the electric heat tracing system and significantly improves its resistance to external damage and service life, but more importantly, it creatively realizes the pluggable installation of the electric heat tracing cable 2. When the system needs to be repaired or the electric heat tracing cable 2 needs to be replaced, there is no need to damage the external insulation layer and protective shell 4. The operation can be completed directly through the junction box 3 from the heat tracing sleeve 1, which greatly simplifies the maintenance process, shortens the repair time, and significantly reduces maintenance costs and system downtime losses. It retains the advantages of precise temperature control and flexible installation of electric heat tracing while overcoming the maintenance difficulties under its traditional installation method.

[0039] In addition, this embodiment also includes a power supply. A terminal block 5 is provided inside the junction box 3. The power supply is connected to the terminal block 5 through a cable 7. A conduit 6 is provided outside the cable 7.

[0040] like Figures 1-6 As shown, in some embodiments, the pre-installation step of the heat tracing sleeve 1 specifically includes: like Figure 3 As shown, at the straight pipe section, the heat tracing sleeve 1 is laid parallel to the pipeline axis in the lower half of the fluid transport pipeline section, and the heat tracing sleeve 1 is set at at least 45° on one side of the bottom of the fluid transport pipeline. like Figure 4 As shown, at the bend, the heat tracing sleeve 1 is laid along the curvature of the bend, and the heat tracing sleeve 1 is connected to the heat tracing sleeve 1 of the straight pipe section. The heat tracing sleeve 1 is provided on at least one side of the inner bend and the outer bend of the bend. like Figure 5 As shown, at the tee, the heat tracing sleeve 1 is installed in the direction of the main pipeline continuing the straight pipe section, and the heat tracing sleeve 1 is laid on at least one side of the branch pipeline in the direction of the branch pipeline. like Figure 6 As shown, a heat tracing sleeve 1 that matches the shape of the valve is installed at the valve.

[0041] By designing differentiated installations for straight pipe sections, elbows, tees, and valves in different structural parts of the fluid transport pipeline, the heat tracing system achieves a high degree of fit with the form of the process equipment and precise coverage of heat compensation. This ensures continuous and uniform heat transfer along the fluid path, effectively avoiding excessive local heat dissipation or heating blind spots, and significantly improving the thermal efficiency and temperature control uniformity of the entire heat tracing system. Furthermore, by customizing heat tracing sleeves for complex components such as valves, the pain points of traditional heat tracing methods, such as difficult installation and poor thermal contact on these components, are solved. This ensures complete thermal protection from the main pipeline to the branch pipelines and even every key component, enhancing the overall reliability and media maintenance effect of the system in harsh environments.

[0042] like Figure 1 , Figure 9 and Figure 10 As shown, in some embodiments, the pre-installation of the heat tracing sleeve 1 in the storage device specifically includes: like Figure 9 As shown, for a rectangular storage tank, multiple heat tracing sleeves 1 are arranged circumferentially at intervals along the height direction on the outer wall surface of the rectangular storage tank, and multiple heat tracing sleeves 1 are arranged horizontally at intervals on the top and bottom surfaces of the rectangular storage tank. like Figure 10 As shown, for a cylindrical storage tank, multiple heat tracing sleeves 1 are arranged circumferentially at intervals along the height direction on the outer wall surface of the cylindrical storage tank, or multiple heat tracing sleeves 1 are arranged circumferentially on the outer wall surface of a rectangular storage tank, and heat tracing sleeves 1 are arranged radially or in concentric rings on the top and bottom surfaces of the cylindrical storage tank.

[0043] By employing a vertical or spiral layout on the outer wall and a horizontal, radial, or concentric ring arrangement on the top and bottom surfaces, comprehensive and uniform heat coverage of the storage container's three-dimensional surface is achieved. This effectively adapts to the heat dissipation characteristics of containers with different geometries, ensuring that heat is uniformly introduced from all directions. It significantly improves the overall insulation performance and temperature field consistency of large storage tanks in low-temperature environments, overcoming the technical limitations of traditional heating methods that easily result in uneven heating, localized overcooling, or heat concentration on the container surface. This ensures the temperature stability and process safety of the storage medium under complex climatic conditions.

[0044] like Figure 1 , Figures 11-14 As shown, in some embodiments, the installation steps of the junction box 3 specifically include: Determine the installation location: Based on the laying path of the heat tracing sleeve 1 in the straight pipe section, elbow, tee, and valve of the fluid conveying pipeline, as well as the arrangement of the heat tracing sleeve 1 on the storage container, pre-set the junction box 3 installation point at the connection of different heat tracing sleeves 1. Fixing the box body: Fix the base of the junction box 3 to the outer surface of the storage container or fluid transport pipeline by means of structural adhesive bonding or welding; Connecting the heat tracing sleeve 1: The heat tracing sleeve 1 is detachably connected to the interface of the junction box 3 by means of threaded connection, compression fitting or quick-connect fitting; Internal treatment: The inside of junction box 3 is filled with high-temperature resistant insulation material.

[0045] By pre-setting installation points at all critical connections of the heat tracing pipeline and using a robust base fixing method, the long-term structural stability of junction box 3 is ensured in complex industrial environments. The detachable connection design makes the connection between heat tracing sleeve 1 and junction box 3 both safe and reliable, and easy to quickly separate, which greatly facilitates subsequent maintenance operations. In addition, the treatment of filling the junction box 3 with high-temperature resistant insulation material effectively reduces the thermal bridging effect and heat loss at this node, ensuring the thermal efficiency and temperature uniformity of the entire heat tracing system. Thus, while realizing the electrical connection function, the thermal performance and long-term operational reliability of the system are also taken into account.

[0046] like Figure 1 As shown, in some embodiments, the size selection of the heat tracing sleeve 1 must meet the following conditions: The inner diameter of the heat tracing sleeve 1 is at least 4 mm larger than the maximum external dimensions of the electric heat tracing cable 2 to which it is installed; Alternatively, the net internal cross-sectional area of ​​the heat tracing sleeve 1 is greater than 140% of the cross-sectional area of ​​the electric heat tracing cable 2.

[0047] By precisely controlling the dimensional relationship between the internal space of the sleeve and the electric heating cable 2, the three key requirements of installation operability, heat dissipation efficiency, and maintenance convenience are scientifically balanced. Furthermore, sufficient radial clearance and cross-sectional area redundancy not only ensure that the electric heating cable 2 is not damaged during the pipe insertion process and that installation is smooth, but also provide ample air convection space for heat dissipation during operation, effectively preventing hot spots or accelerated aging caused by heat accumulation inside the sleeve. At the same time, this dimensional margin also provides necessary operational space for the subsequent removal and replacement of the electric heating cable 2, ensuring the maintainability of the system throughout its entire lifecycle from the design source, reflecting a preventative design philosophy.

[0048] like Figure 1 As shown, in some embodiments, the maintenance steps specifically include: Disconnect the power and confirm that there is no power. Open the corresponding junction box 3 and disconnect the electric heating tape 2; Slowly pull out the electric heating tape 2 from one end of the heat tracing sleeve 1; Inspect the internal condition of the heat tracing sleeve 1, clean it, and then insert another electric heat tracing cable 2; Reconnect and test the performance of the other electric heating tape 2.

[0049] Through a closed-loop process of power-off verification, modular disconnection, pull-out replacement, sleeve condition inspection, and performance testing, the safety of maintenance operations is greatly improved, avoiding the risks of live operation. It also significantly reduces the technical threshold and time cost of maintenance. Furthermore, it ensures that the diagnosis and replacement of the electric heating tape 2 can be completed efficiently without touching the insulation layer and protective shell 4, minimizing system downtime and achieving fast and convenient maintenance. This provides reliable technical support for the full life cycle management of the electric heat tracing system.

[0050] like Figure 1 As shown, in some embodiments, an insulation resistance test step is also included between the installation and maintenance steps of the junction box 3, which is required to be not less than 20MΩ; Perform a circuit continuity test to ensure that the electric heating tape 2 is connected correctly; Conduct a power-on trial run and monitor whether the temperature of each section meets the design requirements; The initial operating current and temperature data were recorded as a baseline.

[0051] By implementing insulation resistance testing, electrical insulation defects that may occur during installation can be effectively detected and eliminated, preventing the risk of leakage. Furthermore, circuit continuity testing can verify the integrity and correctness of the electrical connections of the entire heat tracing circuit, avoiding open circuit or short circuit faults. Power-on trial operation combined with multi-point temperature monitoring is the final test of the system's thermal performance, ensuring that the actual heating effect meets the design requirements and establishing an initial operating data benchmark. This not only provides an objective basis for current acceptance but also accumulates a valuable data foundation for future system status monitoring, performance comparison, and preventive maintenance, realizing full-process quality control and traceability management from installation to operation and maintenance.

[0052] like Figure 1 As shown, in some embodiments, a sealing step is further included between the installation step and the maintenance step of the junction box 3. The sealing step includes: Sealing of junction box 3: Set a sealing strip or apply sealant to the mating surface between the junction box body and the cover of junction box 3; Sealing at the connection between heat tracing sleeve 1 and junction box 3: Wrap sealing tape or apply thread sealant at the lock nut or interface connection between heat tracing sleeve 1 and junction box 3 to ensure the airtightness of the interface. Sealing of the lead wires of the electric heating cable 2: Use rubber cable plugs or waterproof glands to tighten and seal where the power or signal wires of the electric heating cable 2 pass through the wall of the junction box 3. System overall airtightness verification: After all sealing steps are completed, the junction box 3 is subjected to an airtightness or waterproof spray test to verify its sealing effect.

[0053] Through multi-layered waterproofing and moisture-proofing treatments, a long-term protective barrier is constructed for key nodes of the electric heat tracing system in harsh industrial environments. From the static sealing of the junction box 3 to the dynamic sealing of the heat tracing sleeve 1 interface, and then to the through-sealing of the cable inlet and outlet, all possible water seepage paths are completely blocked. This ensures the insulation safety and stable operation of the electrical components of the electric heat tracing system in humid, water-sprayed, and even corrosive environments. The final airtightness or spray test provides an objective verification of the quality control of the entire sealing process, eliminating the risk of sealing failure due to installation oversights. This provides a solid guarantee for the long-term maintenance-free operation of the system in complex working conditions such as outdoors and in pits.

[0054] In this embodiment, the electric heating cable 2 and the heat tracing sleeve 1 of the straight pipe section are laid at a 45° position on the left or right side of the bottom of the fluid transport pipeline. If the heat power of one electric heating cable 2 is not sufficient to meet the heat tracing temperature requirements, one cable can be laid at a 45° position on each side of the bottom of the medium pipeline. Junction boxes 3 are installed at the head and tail of the straight pipe section respectively. For straight pipe sections exceeding 50 meters, an additional junction box 3 is added every 30 meters.

[0055] In this embodiment, the number of heating cables installed at the horizontal elbow is the same as that of the straight pipe section. The electric heating cable 2 and the heating sleeve 1 are installed on the outer side of the elbow, and the number of them is the same as that of the straight pipe section. The electric heating cable 2 and the heating sleeve 1 of the elbow are consistent with the bending radius of the elbow. The heat power of one electric heating cable 2 is not sufficient to meet the heating temperature requirements, so one cable can be laid on both the inner and outer bends of the elbow. Junction boxes 3 are installed at the junctions of the elbow and the straight pipe section on both sides to ensure complete connection between the elbow and the straight pipe section sleeve.

[0056] In this embodiment, the installation position and number of electric heating tape 2 and heat tracing sleeve 1 of the horizontal tee are the same as those of the straight pipe section. The installation position and number of heat tracing tapes in the pipeline direction of the horizontal tee are the same as those of the straight pipe section. The heat tracing tapes in the pipeline direction are not connected to the heat tracing tapes in the straight pipe section. The installation position of electric heating tape 2 and heat tracing sleeve 1 of the vertical tee is on the outside of the tee, and the number of tapes is the same as that of the straight pipe section. The electric heating tape 2 and heat tracing sleeve 1 in the pipeline direction of the tee can be installed on the left or right side. The heat tracing tapes in the pipeline direction are not connected to the heat tracing tapes in the straight pipe section.

[0057] In this embodiment, the valve is subject to frequent maintenance and replacement. The heating cable can be directly laid on the valve body. The heating cable 2 is not disconnected and has a reserved length of 3 times the circumference of the valve body. The heating cable 2 is folded into two strands and wrapped around the valve body. The heating cable 2 is covered with an insulation layer and a protective shell 4.

[0058] In this embodiment, the heat tracing sleeve 1 and the junction box 3 are fixed to the outer surface of the fluid pipeline by metal hose clamps or spot welding. The spacing between hose clamps and welded connections should be approximately 1 meter. The sleeve must be securely and reliably fixed. The junction box 3 is 100x100mm in size, with a depth consistent with the insulation thickness, and a minimum depth of 50mm. The connection between the sleeve and the junction box 3 uses a lock nut connection with a protective sleeve installed at the pipe opening. The junction box 3 cover is waterproof and removable. After the heat tracing installation of the junction box 3 is completed, the interior is filled with insulation material to reduce heat loss. Hot-dip galvanized steel pipes and hot-dip galvanized iron boxes are preferred for the heat tracing sleeve 1 and the junction box 3.

[0059] In this embodiment, the heat tracing sleeve 1 is uniformly fixed on the front, back, left, right and top surfaces of the rectangular storage container. The sleeves on the vertical surfaces are preferably installed vertically on the vertical surfaces and horizontally on the top surfaces. The sleeves are wrapped with insulation boards and shells 4 of different materials. The installation spacing of the sleeves is determined according to the storage temperature of the heat-traced medium. The bottom of the storage container is generally close to the equipment foundation and does not require heat tracing. When the bottom of the storage container is installed in an elevated position, heat tracing and insulation are required, and the method is the same as that for the top.

[0060] The heat tracing sleeve 1 and wiring are installed at the top of the storage container's facade. They can be shared with the junction box 3 of the top heat tracing sleeve 1. The junction box is either an independent junction box or a long strip junction box, 100mm wide. The length of the long strip junction box is determined according to the size of the storage container, and the depth is the same as the insulation layer thickness, with a minimum depth of 50mm. The heat tracing sleeve 1 and junction box 3 are fixed to the outer surface of the fluid transport pipeline using metal structural adhesive or spot welding. The adhesive bonding spacing on both sides of the heat tracing sleeve 1 is 200mm, with adhesive dots no less than 50mm in length. The welding spacing is 500mm. The junction box 3 is adhesive bonding or spot welding on all four sides. The heat tracing sleeve 1 and junction box 3 are securely and reliably fixed. When the top and bottom of the storage container are not heat-traced, the heat tracing sleeve 1 can be installed horizontally on the surface, and the junction box 3 can be installed vertically at the corner of the storage container, thus providing heat tracing for both sides.

[0061] In this embodiment, the heat tracing sleeve 1 is uniformly fixed on the outer periphery and top surface of the circular storage container. The vertical sleeve is preferably installed vertically, and the top sleeve is installed horizontally in a ring on the surface. The sleeve is wrapped with insulation board and shell 4 of different materials. The installation spacing of the sleeve is determined according to the storage temperature of the heat-traced medium. The bottom of the storage container is generally close to the equipment foundation and does not need to be heat-traced. When the bottom of the storage container is installed in the air, heat tracing and insulation are required, and the method is the same as that for the top. The heat tracing sleeve 1 and junction box 3 are installed at the top of the storage container facade, and the top junction box 3 is installed in the middle of the top. The facade junction box 3 should be a single junction box 3 with a size of 100x100mm and a depth the same as the insulation layer thickness, with a minimum depth of not less than 50mm. The top junction box 3 is a long strip with a width of 100mm and a length determined according to the size of the storage container. Its depth is the same as the insulation layer thickness, with a minimum depth of not less than 50mm. The heat tracing sleeve 1 and junction box 3 are fixed to the outer surface of the fluid pipeline by adhesive bonding or spot welding. The adhesive bonding on both sides of the sleeve is spaced 200mm apart, and the adhesive bonding point length is not less than 20mm. The spot welding is spaced 500mm apart. The junction box 3 is glued or spot welded on all four sides. The sleeve and junction box 3 are firmly and reliably fixed.

[0062] In this embodiment, the heat tracing sleeve 1 and the junction box 3 are connected using KBG / JDG locknuts. Elbows and connectors utilize KBG / JDG dedicated fittings. The junction box 3 cover is waterproof and easy to install and remove. After the heat tracing installation of the junction box 3 is completed, it is filled with insulation material to reduce heat loss. In this embodiment, the heat tracing sleeve 1 is preferably made of galvanized KBG / JDG steel pipe, and the junction box 3 is preferably made of KBG / JDG dedicated galvanized iron box. Stainless steel can be used in special environments.

[0063] In this embodiment, the fluid pipeline can use a self-regulating or constant power electric heating tape 2, the storage container uses a self-regulating electric heating tape, and the parallel / series constant power electric heating tape 2 needs to be customized according to the external dimensions of the storage container. The voltage of the electric heating tape 2 can be 380V, 220V, or 36V according to actual needs. Secondly, see Figure 2 An embodiment of this application provides an electric heat tracing system for implementing the above-mentioned electric heat tracing installation method for fluid transportation and storage equipment. The system includes multiple heat tracing sleeves 1, multiple electric heat tracing cables 2, multiple junction boxes 3, an insulation layer, and a protective outer shell 4. The multiple heat tracing sleeves 1 are respectively installed at straight pipe sections, bends, tees, and storage equipment, forming a continuous heat tracing channel. Multiple electric heat tracing cables 2 are inserted inside different heat tracing sleeves 1. The electric heat tracing cables 2 and the heat tracing sleeves 1 constitute a heat tracing structure. Multiple junction boxes 3 are respectively installed at the connection points of different adjacent heat tracing sleeves 1. The junction boxes 3 are used for electrical connection and maintenance of the electric heat tracing cables 2. The insulation layer and the protective outer shell 4 are wrapped around the outside of the heat tracing sleeves 1.

[0064] like Figures 2-14 As shown in the embodiments of this application, an electric heat tracing system is provided, which achieves a systematic upgrade of traditional electric heat tracing technology through modular design. Its core lies in constructing a channelized heat tracing structure composed of a pre-installed heat tracing sleeve 1, a pluggable electric heat tracing cable 2, and a standardized junction box 3. This structure, while retaining the precise temperature control advantages of electric heat tracing, fundamentally changes its installation and maintenance paradigm. The heat tracing sleeve 1, as a permanent infrastructure, provides reliable mechanical protection and a heat dissipation channel for the electric heat tracing cable 2, while the node-based arrangement of the junction box 3 makes electrical connections and maintenance operations highly centralized and standardized. The entire system is integrated within a unified thermal insulation system, forming an integrated thermal protection solution. This not only significantly improves the system's durability and reliability under complex operating conditions but also greatly reduces the operating and maintenance costs throughout its entire life cycle through its unique maintainable design. It provides an electric heat tracing system that is both efficient, reliable, and economical for the antifreeze and insulation needs of fluid transportation and storage equipment.

[0065] In some embodiments, the electric heat tracing system further includes a temperature control system, which includes temperature sensors and a control unit. The temperature sensors include multiple sensors, which are respectively installed on different heat tracing sleeves 1. The temperature sensors are used to monitor the temperature in real time, and the control unit can automatically adjust the output power of the electric heat tracing cable 2 according to the monitored temperature and set parameters.

[0066] By distributing temperature sensors at multiple key nodes of the heat tracing sleeve 1, the electric heat tracing system can accurately sense the actual thermal state of different parts of the equipment and adjust the output power of the electric heat tracing tape 2, thereby achieving dynamic adjustment of the heat tracing and overcoming the temperature monitoring blind spots and control lag problems caused by traditional single measuring points. Furthermore, based on real-time temperature data from multiple feedback points and preset parameters, the control unit dynamically and precisely adjusts the output power of the electric heat tracing tape 2 in a closed-loop manner. This not only achieves stable maintenance of the medium temperature and avoids excessive energy consumption, but also intelligently adapts to fluctuations in ambient temperature and changes in process conditions. This improves system energy efficiency and economy while enhancing the protection capability for heat-sensitive media, making the entire electric heat tracing system safer, more efficient, and more adaptive.

[0067] Although the invention has been described with reference to preferred embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner as long as there is no structural conflict. The invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A method for installing electric heat tracing in fluid conveying and storage equipment, characterized in that, The method includes the following steps: Pre-installation: Heat tracing sleeves are pre-laid on the outer surface of the fluid transport pipeline or storage container to be heat-traced, forming a continuous heat tracing channel, wherein the heat tracing sleeves are respectively installed at straight pipe sections, elbows, tees and valves. Junction box installation: A junction box is installed at the connection node of the heat tracing sleeve, and the junction box is detachably connected to the heat tracing sleeve. Electric heat tracing installation: The electric heat tracing tape is inserted into the heat tracing sleeve to form a composite heat tracing structure. The internal channel of the heat tracing sleeve is used to accommodate and fix the electric heat tracing tape, and can provide mechanical protection and heat dissipation space for the electric heat tracing tape, so that the heat tracing sleeve, together with the external insulation layer and protective shell of the fluid conveying pipeline, constitute a heat insulation mechanism. Maintenance: When the electric heating cable fails or reaches the end of its service life, the electric heating cable is directly pulled out from inside the heat tracing sleeve and another electric heating cable is inserted.

2. The electric heat tracing installation method for fluid conveying and storage equipment according to claim 1, characterized in that, The pre-installation steps of the heat tracing sleeve specifically include: At the straight pipe section, the heat tracing sleeve is laid parallel to the pipeline axis in the lower half of the cross-section of the fluid transport pipeline, and the heat tracing sleeve is set at at least 45° on one side of the bottom of the fluid transport pipeline. At the bend, the heat tracing sleeve is laid along the curvature of the bend, and the heat tracing sleeve is connected to the heat tracing sleeve of the straight pipe section. The heat tracing sleeve is provided on at least one side of the inner bend and the outer bend of the bend. At the tee, the heat tracing sleeve installation method of the straight pipe section continues in the direction of the main pipeline, and the heat tracing sleeve is laid on at least one side of the branch pipeline in the direction of the branch pipeline. At the valve, a heat tracing sleeve that matches the shape of the valve is installed.

3. The electric heat tracing installation method for fluid conveying and storage equipment according to claim 1, characterized in that, The pre-installation of the heat tracing sleeve on the storage device specifically includes: For a rectangular storage tank, a plurality of heat tracing sleeves are arranged circumferentially at intervals along the height direction on the outer wall surface of the rectangular storage tank, and a plurality of heat tracing sleeves are arranged horizontally at intervals on the top and bottom surfaces of the rectangular storage tank. For a cylindrical storage tank, multiple heat tracing sleeves are arranged circumferentially at intervals along the height direction on the outer wall surface of the cylindrical storage tank, or multiple heat tracing sleeves are arranged circumferentially on the outer wall surface of a rectangular storage tank, and heat tracing sleeves are arranged radially or in concentric rings on the top and bottom surfaces of the cylindrical storage tank.

4. The electric heat tracing installation method for fluid conveying and storage equipment according to claim 1, characterized in that, The specific steps for installing the junction box include: Determine the installation location: Based on the laying path of the heat tracing sleeve at the straight pipe section, elbow, tee, and valve of the fluid conveying pipeline, and the arrangement of the heat tracing sleeve on the storage container, pre-set junction box installation points at different connection points of the heat tracing sleeve; Fixing the junction box: The base of the junction box is fixed to the outer surface of the storage container or the fluid delivery pipeline by means of structural adhesive bonding or welding; Connecting the heat tracing sleeve: The heat tracing sleeve is detachably connected to the interface of the junction box via threaded connection, compression fitting connection or quick-connect fitting; Internal treatment: The inside of the junction box is filled with high-temperature resistant insulation material.

5. The electric heat tracing installation method for fluid conveying and storage equipment according to claim 1, characterized in that, The size selection of the heat tracing sleeve must meet the following conditions: The inner diameter of the heat tracing sleeve is at least 4 mm larger than the maximum external dimensions of the electric heat tracing cable. Alternatively, the net internal cross-sectional area of ​​the heat tracing sleeve is greater than 140% of the cross-sectional area of ​​the electric heat tracing cable.

6. The electric heat tracing installation method for fluid conveying and storage equipment according to claim 1, characterized in that, The maintenance steps specifically include: Disconnect the power and confirm that there is no power. Open the corresponding junction box and disconnect the electric tracing tape. Slowly pull out the electric heating tape from one end of the heat tracing sleeve; Inspect the internal condition of the heat tracing sleeve, clean it, and then insert another heat tracing cable. Reconnect and test the performance of the other electric heating tape.

7. The electric heat tracing installation method for fluid conveying and storage equipment according to claim 1, characterized in that, An insulation resistance test step is also included between the junction box installation step and the maintenance step, which requires an insulation resistance of not less than 20MΩ. Perform a circuit continuity test to ensure that the electric heating tape is connected correctly; Conduct a power-on trial run and monitor whether the temperature of each section meets the design requirements; The initial operating current and temperature data were recorded as a baseline.

8. The electric heat tracing installation method for fluid conveying and storage equipment according to claim 1, characterized in that, A sealing step is also included between the junction box installation and maintenance steps, and the sealing step includes: Sealing of the junction box: A sealing strip or sealant is applied to the mating surface between the junction box body and the cover. Sealing at the connection between the heat tracing sleeve and the junction box: Wrap sealing tape or apply thread sealant at the connection between the heat tracing sleeve and the lock nut or interface of the junction box to ensure the airtightness of the interface. Sealing of the lead wires of the electric heating cable: Use rubber cable plugs or waterproof glands to tighten and seal where the power cord or signal wire of the electric heating cable passes through the junction box wall; Overall system airtightness verification: After all sealing steps are completed, the junction box is subjected to an airtightness or waterproof spray test to verify its sealing effect.

9. An electric heat tracing system for implementing the electric heat tracing installation method for fluid transport and storage equipment as described in any one of claims 1-8, characterized in that, The device includes multiple heat tracing sleeves, multiple electric heat tracing cables, multiple junction boxes, an insulation layer, and a protective outer shell. The multiple heat tracing sleeves are respectively installed at straight sections, bends, tees, and storage devices of the pipeline to form a continuous heat tracing channel. The multiple electric heat tracing cables are inserted inside different heat tracing sleeves. The electric heat tracing cables and the heat tracing sleeves constitute a heat tracing structure. The multiple junction boxes are respectively installed at the connection points of different adjacent heat tracing sleeves. The junction boxes are used for electrical connection and maintenance of the electric heat tracing cables. The insulation layer and the protective outer shell are wrapped around the outside of the heat tracing sleeves.

10. The electric heat tracing system according to claim 9, characterized in that, The electric heat tracing system also includes a temperature control system, which includes temperature sensors and a control unit. The temperature sensors are multiple and are respectively installed on different heat tracing sleeves. The temperature sensors are used to monitor the temperature in real time. The control unit can automatically adjust the output power of the electric heat tracing cable according to the monitored temperature and set parameters.

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