Yifen School provides full free training and consulting services for Anyi Members, and will surely become the best platform for quickly improving HVAC professional skills and company performance in the HVAC industry. With a broad vision, unique skills, and willingness to contribute to the HVAC industry, welcome to join the Yifen School lecturer team and become one of us. We want you! Fix the heating cable on the dry pipeline with fiberglass pressure-sensitive tape or aluminum tape at 50cm intervals, and generally place the heating cable at 45 degrees below the pipeline as much as possible; reserve 1m of heating cable at the first power supply point and the end of the line; reserve a certain length of heating cable at all heat dissipating parts such as brackets, valves, flanges, etc. for easy removal, maintenance, and replacement. At the use of two-way or three-way fittings, reserve 40cm at each end of the heating cable. For multiple heating cables, pay attention to reasonable selection of power points for easy maintenance. The insulation layer material must be dry, with a waterproof outer cover, and a warning label indicating "Heating cable inside" should be attached outside the insulation layer. Avoid sharp edges and corners; the heating cable surface must be free of damage; the insulation resistance of the heating cable should be ≥20MΩ (1000VDC). Do not forcefully pull the heating cable, avoid stepping on or placing heavy objects on it; the models of the heating cable and all accessories should match the design requirements. Test each independent circuit at one end with 2500VDC; the insulation resistance should be above 20MΩ. Ensure that the power supply part has good overload protection, leakage protection, and explosion-proof safety devices. V-type, must use matching sealing caps for tight sealing; waterproof and explosion-proof occasions should have matching explosion-proof junction boxes and terminals. After wiring, seal with silicone rubber (for heating cables with shielding layer, strip 10cm of the shielding layer at the terminal to prevent short circuit); measure the insulation of the heat tracing point one by one during installation; the shielding layer must be grounded; the insulation resistance should not be less than 20MΩ (1000VDC). Select bipolar disconnect and leakage protection circuit breakers according to the voltage, current and other parameters of each electric heat tracing circuit. For steam cleaning of pipelines to remove scale, note that cleaning should be done before installing the heating cable. If annual routine steam cleaning is required, design and install according to special circumstances. 4. Self-regulating electric heat tracing long line is specially used for anti-freezing and heat preservation of long-distance pipelines. The maximum maintenance temperature is 65℃. Single power supply line (m). The heat tracing line is suitable for ordinary areas, hazardous areas, or corrosive areas. 5. Self-regulating electric heat tracing long line is specially used for anti-freezing and heat preservation of long-distance pipelines. It has a higher maintenance temperature (up to 150℃) and can withstand a higher exposure temperature (up to 215℃). The single power supply length can reach 1830m. The heat tracing line is suitable for ordinary areas, hazardous areas, and anti-corrosion areas. 2. The installation, commissioning, and operation of electric heat tracing must comply with the national standards GB50254-96 "Code for Construction and Acceptance of Electrical Installations in Explosive and Fire Hazardous Environments" and GB50257-96 "Code for Construction and Acceptance of Low-Voltage Electrical Appliances" and other relevant provisions. 3. Various electric heat tracing cables have minimum bending radius requirements during installation and laying; excessive bending will damage the heating cable. 4. Electric heat tracing cables laid parallel along the pipeline are generally installed below the pipeline and at the horizontal axis of the pipeline cross-section; multiple heating cables should be laid symmetrically. 5. When installing on a container, the heating cable should be wound around the lower part of the container, usually not exceeding 2/3 of the container height, generally 1/3. 6. For non-metallic pipeline electric heat tracing, a metal sheet (aluminum foil) should be sandwiched between the outer wall of the pipeline and the heating cable. 7. When installing the heating cable, fully consider the possibility of disassembly of pipeline accessories and equipment to ensure that the heating cable itself is not damaged. 8. When installing accessories, ensure that rubber rings, gaskets, fasteners, etc. are complete, installed correctly, and tightened to prevent loosening or entry into the box. 2. When laying parallel on horizontal pipelines, ensure that the heating cable is tightly attached to the bottom of the pipeline to transfer heat more effectively during operation and reduce heat loss. 3. Also note that the freeze protection sensor should be installed on the upper part of the pipeline (i.e., opposite to the heating cable); do not directly contact the freeze protection sensor with the heating cable, otherwise it cannot accurately detect the actual temperature of the pipeline. 4. Also pay attention to the installation position of the freeze protection sensor; it is best to place it at the lowest temperature point of the pipeline. 5. During construction, check that the surface of the heating cable has no scratches, cracks, etc.; if found, replace immediately. 6. In addition to using intelligent instruments to control the operation of the heating cable, when using the heating cable alone for freeze protection, the power input end must be equipped with a leakage protection device, and a common three-pin plug cannot be used directly. The ground protection wire must be reliably connected to the pipeline where the heating cable is laid. In this way, once the heating cable leaks, the leakage protection device can reliably act to cut off the power supply to ensure safety. DXW, ZXW self-regulating temperature heating cables; DWK, ZWK self-regulating temperature heating cables; DBR, ZBR self-regulating temperature heating cables; DBW, ZBW self-regulating temperature heating cables. Self-regulating temperature heating cables consist of conductive polymer (plastic) and two parallel metal wires and an insulating sheath. Its characteristic is that the conductive polymer has a high positive temperature coefficient (PTC) characteristic and is connected in parallel, automatically adjusting the output power as the temperature of the heated system changes, and automatically limiting the heating temperature. It can be cut arbitrarily or extended within a certain range, and allows multiple cross overlaps without the risk of high-temperature hot spots or burnout. Therefore, the above-mentioned constant temperature heating is adapted to the heated system, while traditional constant power heaters affect the heated system. *Self-regulating temperature heating cables automatically adjust the output power according to the heated system, so they will not burn out due to self-heating but compensate for the actual required heat, making them a new generation of energy-saving constant temperature heaters. *Low temperature state, fast start-up, uniform temperature, because each part can automatically adjust according to the temperature change at the heat tracing point. *Safe, reliable, versatile, non-polluting, long life. Self-regulating temperature heating cables (self-regulating electric heat tracing lines) are widely used in pipelines and storage tanks of petroleum, chemical, steel, electric power and other industrial enterprises for heat tracing, anti-condensation, and freeze protection. The cable is suitable for ordinary areas, hazardous areas, and corrosive areas. 4. Thermal stability: After 300 cycles between 10℃ and 99℃, the cable heating capacity remains above 90%. 6. Insulation resistance: For a cable length of 100m at an ambient temperature of 75℃, when tested with a 2,500VDC megger for 1 minute, the insulation resistance (conductor A. This site is a network storage space for personal knowledge management. All content is published by users and does not represent the views of this site. Please pay attention to distinguishing contact information, inducement to purchase, etc. in the content to avoid fraud. If you find harmful or infringing content, please click
