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Should a sprinkler fire extinguishing system use electric heating to prevent freezing?
The water in the fire pipe is standing and freezes more easily in winter than in the public water supply. Even in East China with a subtropical monsoon climate, despite the fact that the outdoor temperature in winter for a short period of time is below the freezing point, there is still a possibility that the static fluid in the pipeline may also freeze.
Oct 25,2022
The water in the fire pipe is standing and freezes more easily in winter than in the public water supply. Even in East China with a subtropical monsoon climate, despite the fact that the outdoor temperature in winter for a short period of time is below the freezing point, there is still a possibility that the static fluid in the pipeline may also freeze.
Fire sprinkler pipes typically use steel pipes that are divided into four levels according to the heat transfer process of steel pipes, namely: liquid-wall steel pipe-insulation material-atmosphere. Among them, the heat exchange between the liquid, the steel pipe wall and the thermal insulation material refers to the internal heat exchange of the steel pipe, and the heat exchange between the thermal insulation material and the atmosphere refers to the external heat exchange. Steel pipe.
According to the toilet, at an outside air temperature of-5 °C, the non-freezing time of a spray pipe with a pipe diameter exceeding or equal to DN50 exceeds 4.0 h. For a spray pipe with a pipe diameter smaller than or equal to DN40., thermal insulation measures can be taken. However, for DN25, DN20 and DN15 pipes, the thickness of the thermal insulation layer is too large, which is not only inconvenient to install, but also economical, so electric heating can be considered to prevent freezing and heat preservation.
The flow of water in the pipes of the fire sprinkler system is static, so they are more prone to freezing than conventional water pipes. As for the antifreeze problem of the fire extinguishing system pipeline, it should be considered comprehensively according to the requirements of the building safety level, the economical type of system and the project location. In East China (Jiangsu-Shanghai District), the stay time below 0 °C in winter is less. For outer pipes with a pipe diameter of less than or equal to DN25, electric heating can be considered. For the northern region, winter temperatures are usually below freezing, so whether it is DN150-100 or DN25-DN15 sprinkler pipes, electric heating, such as electric heating, must be used.
The reason why it is recommended to use electric heating is that compared with water heating, electric heating has the advantages of uniform heating, accurate temperature control, relatively high thermal efficiency, easy operation, energy saving and environmental protection. In
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