Electric heat tracing explosion-proofHigh temperature electric heating plate
1. Design drawing confirmation: A complete design drawing should be available before construction, including the following information: 1. Circuit number, power supply point indicated by a rectangle. 2. Model and length of heat tracing cable required for the circuit. (Unit: meters) 3. Length of heat tracing cable required per meter of pipe length (Unit: meters), i.e., winding factor. 4. Length of heat tracing cable required for each valve. (Unit: meters) 5. List of supporting materials and accessories for the heat tracing system. 6. List of temperature control system components. 7. List of materials required for construction. 8. Design parameters and specifications of insulation materials used.
1. The piping system and equipment have been installed. 2. The anti-rust and anti-corrosion coating is completely dry. 3. The piping system installation complies with the design drawing. 4. All burrs and sharp edges have been filed off.
(B) Heat tracing cable and accessories: 1. Check if the surface of the heat tracing cable is damaged. 2. The insulation performance of the heat tracing cable is good (insulation resistance should be ≥ when tested with a megger at 1000VDC). 3. The models of the heat tracing cable and all accessories match the design requirements.
(C) Site preparation: 1. Place a roll of heat tracing cable and the reel on a support, lay the heat tracing cable along the pipeline, and avoid:
3. Single heat tracing cable installation method: 1. Use fiberglass pressure-sensitive tape or aluminum tape to fix the heat tracing cable to the pipe every approximately 50 cm. 2. When laying flat, place the heat tracing cable on the lower 45-degree side of the pipe as much as possible. 3. Reserve 1 m of heat tracing cable at the power supply point and the end of the circuit. 4. Route the cable according to the winding factor shown in the design drawing (if the factor is an integer, lay flat to reduce connection points). 5. For all heat sinks (such as supports, valves, flanges, etc.), reserve the required length of heat tracing cable as per the design drawing, wrap this section around the heat sink body, and secure it.
Note the following points: *The heat sink should have the required length of heat tracing cable as designed. *Heat tracing cables can overlap or cross each other. Reserve 40 cm at each end of the heat tracing cable.
If the winding factor is 1.4, i.e., 5 m of pipe requires 7 m of heat tracing cable, first fix both ends of the 7 m heat tracing cable to a 5 m long pipe section, then wrap the slack cable around the pipe and secure it.
1. The design drawing indicates the winding factor (n=1, 2…) generally used for large-diameter pipes. 2. The method is as follows: *Route the heat tracing cable from one end of the pipeline to the other end and then back to the starting point; the number of routes equals the factor. *Route the heat tracing cable from one end to the other end in sequence; the number of times equals the factor.
*Backup system: critical pipelines for backup emergency use. Therefore, each circuit should be installed as an independent circuit with its own power supply point.
