Shandong Huaning Electric Heating Technology Co., Ltd.
Application of electric heating antifreeze on water pipes in cold regions
Generally, there are two types of electric heating used for freezing protection of water pipes: one is a self-regulating electric heating cable, and the other is a constant power sequential electric heating cable.
Sep 01,2022
Construction water occupies an extremely important strategic position in engineering construction, and any project is inseparable from building water during the construction process. In cold regions, heat conservation and non-freezing of water pipes are of particular importance. This is not a problem of equipment freezing and maintenance, but a big problem of ensuring safe, orderly, timely and efficient execution of contracts and safe water supply.
In cold regions, effective measures should be taken against the freezing of water supply pipelines and several levels of storage tanks in order to ensure the safe operation of pipelines and storage tanks in winter, to ensure the supply of production and household water, and to prevent freezing in relatively flat areas. Areas that can be dug up and buried deeply The problem is relatively easy to solve if the depth of the pipeline is strictly controlled according to design specifications, but if you want to keep in mind the extremes, such as relatively steep hillsides and pristine forests in mountainous areas, deep burying cannot be carried out. This led to the fact that the water pipes must be exposed to the outside, and to ensure the safe supply of water in the winter, only measures for laying and insulation can be taken. In recent years, more and more electric heating systems have been used to protect water pipes from freezing and bring good economic and social benefits.
Generally, there are two types of electric heating used to protect water pipes from freezing: one is a self-regulating electric heating cable, and the other is a constant power sequential electric heating cable.
Self-temperature heating
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 ℃. The characteristic of self-regulating electric heating cable is that the conductive polymer composite material has the characteristic of the temperature coefficient of steam "PTC", but they are related to each other, it can automatically adjust the output power and automatically limit the heating temperature. Heating system with temperature change of heated system. The self-regulating point heating cable can be arbitrarily shortened or lengthened within a certain range, and multiple overlapping is allowed without worrying about low-temperature hot spots and fire.
Advantage
Low temperature, fast start, uniform temperature, as each part can be automatically adjusted due to the change of electric heating temperature; easy installation and maintenance, all-day maintenance, high level of automation, low operation and maintenance costs; safe, reliable, and widely used, No environmental pollution, long service life.
Electric Heating Tape Series
HCL Series Electric Heating Tape is a type of electric heating with a wire core as a heating element Because the resistance per unit length of the wire core and the passing current are constant, the entire heating strip is heated evenly from end to end, and the output power is constant. Its biggest feature is its long length of use, which is mainly suitable for heating and heat preservation of single pipelines of long and ultra-long length. The maximum length of the power point is from several hundred meters to several thousand meters.
Advantage
Compared with other electric heating cables, the most important characteristic of serial electric heating cables is the large working length, which is 5-20 times longer, than conventional electric heating cables Heating pipes or tanks at temperatures below 135 °C. Therefore, it is especially suitable for the design of electric heating of trunk pipelines in the oil, chemical, electricity, berthing, fire and other industries. And it has the advantages of fast start, uniform heating and so on.
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