Most of the chemical industry is in the flammable and explosive area, chemical pipeline or tank medium, such as benzene, concentrated alkali, sulphuric acid, chlorinated paraffin, etc., and more sensitive medium. So for the chemical industry area of the pipeline medium frost insulation is more strict, to accompany the heat of the product demand is raised to a higher level.

                       Choose traditional steam accompanied heat, steam accompanied heat temperature is too high, may be much larger than the medium temperature, resulting in accompanied heat medium temperature overheating. And because the chemical medium corrosiveness is more serious, use the steam accompanies the heat easily to cause the pipeline or the tank local etching through, affects the normal production seriously. Compared with steam accompanied by heat, more reliable choice is electric accompanied by tropical heat preservation way.

　　              Then choose what type of electric accompanied by tropical most suitable? For the sensitive medium of flammable and explosive characteristics, we need to choose flame-proof, explosion-proof, anti-corrosion electric accompanied by tropical products. In the current electric accompanied by the tropical industry, can choose from low temperature self-limiting electric heat, medium temperature self-limiting electric accompanied by the tropical, parallel constant power electric accompanied by the tropical, series constant power electric accompanied by the tropical.

 　　                   Among them, the structure of self-limiting temperature electric accompanying tropical strip is distributed from inside to outside, heat core belt, conductive plastic, inner sheath, metal braiding layer and anti-corrosion outer sheath. Self-limiting temperature electric accompanying tropical metal weaving layer can effectively eliminate static electricity and foreign mechanical force, play the role of explosion-proof grounding and protection. The outermost fluorine plastic outer sheath to prevent organic and corrosive solutions, anti-mechanical damage, and play the role of corrosion prevention.


 　　                  Constant power electric heating cable structure layer including metal braid and fluorine plastic outer sheath, and self-limiting temperature electric accompanying tropical with explosion-proof and anti-corrosion function, with the difference is constant power electric accompanying tropical power constant, accompanying high temperature, high temperature resistance, long use length.