What electric heating cable is used for anti-frost insulation of petrochemical equipment and pipelines?

Published on:

2022-08-31 15:40

Petrochemical plants and auxiliary facilities are generally located outdoors. The extreme temperature range of the environment in winter and summer in north and south China is approximately-40-44 degrees Celsius. The design of electric heating and thermal insulation of instruments and measuring pipelines is a key point ensuring the normal operation of the device.

The electric heating gradually displaced water and steam heating due to its uniform heating, convenient maintenance and automatic control, and became the main material for anti-freezing and heat preservation in petrochemical appliances and pipelines.

Electric heating cables, commonly used for thermal insulation of petrochemical instruments and piping, are mainly divided into self-regulating electric heating cables, constant power parallel heating cables, and constant power series heating cables The rated voltage is usually 220 V (AC) or 380 V (AC). Self-regulating electric heating cables can be divided into three series according to the operating temperature: low-temperature, medium-temperature and high-temperature. The service temperature is 150 ± 5 ℃, and the withstand temperature is 250 ℃.

Self-regulating electric heating cable is used for freezing protection, and its characteristic is that it can automatically control the heating temperature and automatically adjust the power output according to the temperature of the heating element; it can be arbitrarily cut or lengthened. Within the specified length; any incision is allowed; or it can be extended within the specified length; the use of overlapping is allowed; the electrical power of the cold start is relatively large, so the specified length of the device usually does not exceed 100 m.

The rated power range of constant power parallel electric heating cables is 10-60 W/m, and the maximum operating temperature is 130 degrees Celsius; the rated power range of continuous power electric heating cables is 8-45 W/m. The constant-power-side electric heating cable should be equipped with a thermostat for use in cases where precise temperature control is required; it can be arbitrarily cut or lengthened within the specified length range; the use of random intersections and overlays is not allowed. The main features of the constant power series electric heating cables are long length, constant output power, need for customization, and shear resistance. These are commonly used for anti-freezing, anti-condensate and heat preservation in main pipelines, large tanks and storage tanks.

When used in explosion-proof rooms, it should be borne in mind that the explosion-proof performance of heating electrical cables must meet the requirements of fission of explosive zones on the object, especially the requirements for the maximum limit of surface temperature.

Electric heating is finding more and more applications in heating appliances and piping in terms of installation convenience, environmental protection efficiency, maintenance costs and heating accuracy. It has obvious advantages in energy-saving effect and other aspects. At the same time, the widespread use of electric heating in petrochemical equipment and auxiliary facilities allows to fully achieve the standardized design and installation of the electric heating system, as well as to implement automatic control of the entire electric heating system in the device.

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