Design features of electric heating system of fire extinguishing pipeline

Published on:

2023-01-05 11:05

The fire-fighting pipeline is a guarantee of the safety of the water fire-fighting system. The water in the fire-fighting pipeline is stored for a long time, and the water is in a non-flowing state for a long time, in the cold winter, the fire-fighting pipeline without antifreeze measures often freezes. In the event of a fire, the fire-fighting pipeline will not be available in time.

In the northern part of my country, the temperature in winter is generally low. In order to ensure the reliable use of the fire protection system in winter and realize the insulation and antifreeze of the fire protection pipeline, it is necessary to take fire insulation measures. Protection pipeline. Conventional heat preservation can only delay the freezing time of pipelines, but cannot fundamentally solve the problem of antifreeze. A heating line must be laid between the pipeline and the insulation layer to compensate for the heat loss of the pipeline, keep its temperature within the normal operating range and actually achieve the antifreeze effect of the pipeline.

The principle of antifreeze technology for electric heating of the fire pipe is to attach the heating cable to the outside of the pipe to generate electricity, transfer the heat of the liquid in the pipe, and interact with the outer insulation layer of the pipe to compensate for and maintain the temperature of the liquid in the pipe to achieve the calculated temperature level.

The purpose of non-freezing of fire-fighting water facilities is to prevent freezing of the standing water stored inside, to freeze objects and to improve their safety during the cold season, so the function of electric heating is to maintain the water temperature in the facilities above 0 ° C. The terms of reference for the design of the water supply system requires that the water temperature in the water supply is at least 4 ° C, And the general technical project maintained the temperature at 5 ° C. Depending on the diameter of the pipe, the outer diameter of the object, the thickness and thermal conductivity of the insulation layer, the minimum ambient temperature, etc. D. Calculate the maximum heat dissipation and choose the type and method of installation of the electric heating cable according to the heat dissipation.

Heating cable is uniformly wound along fire-fighting structures such as pipes, valves, fire hydrants, foaming tanks, etc. D., and one end is connected to the temperature controller to accurately control the operation of the heating cable. The temperature controller of the heating cable is used to control the temperature of the external surface of the pipe. When the temperature of the detection point is lower than the set value, the thermostat is turned on, and the electric heating system starts to work to maintain the temperature of the pipes, fittings and fire-fighting equipment. When the temperature sensor detects that the temperature of the pipeline is higher than the set temperature, the thermostat disables the power supply so that the electric heating system can operate in the most economical and reasonable condition and meet the design requirements for the fire temperature. -Fight against pipeline insulation.

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