1. First, you must know the heat loss of the pipeline
"The simplified calculation formula of pipeline heat loss: Q=2兀K(Tp-Ta)/ln(D2/D1)
p>In the formula: K is the thermal conductivity of the insulation layer, note that K is the value calculated based on the thermal conductivity equation, Tp is the maintenance temperature, Ta is the lowest temperature of the environment, D1 is the inner diameter of the insulation layer (outer diameter of the pipe), D2 is the outer diameter of the insulation layer. "
It can be seen that the heat loss is related to the lowest possible ambient temperature at startup, the temperature to be maintained by the medium, and the material and thickness of the insulation material.
2. Secondly, after selecting the type of heating tape, the output power of the heating tape is required. The output power of the heating tape must be greater than or equal to the heat loss of the pipe to meet the temperature maintenance requirements. To put it simply, the heat loss per meter divided by the output power of the heating cable per meter is the required laying ratio (the output power of the self-regulating line is the power value required to maintain the temperature point.) It is generally laid parallel to the pipeline at a position diagonally below the pipeline. .
3. How to choose the type of heating tape?
1) The temperature resistance of the heating tape must be higher than the medium or the highest temperature it can be exposed to. (Consider the possible maximum temperature of the medium, whether there are pipeline purging and other conditions that affect the temperature)
2) The relevant certification of the heating tape and accessories should meet the explosion-proof level, protection level, and temperature group of the area. and other requirements
3) Combine the above two points to determine whether to choose self-regulating, constant power, skin effect, etc. based on the length and complexity of the pipeline and the rationality of the distribution circuit settings.
4. The manufacturer should provide you with the selection, installation manual and calculation book you want. It is appropriate to design, install and operate the equipment according to the specific situation.