Open-air shower pipes are exposed to long-term outdoor exposure and cold, frozen cracks during winter, affecting fire water supply. For the most part, water is cut off, water is static within the pipe, and the open environment is affected by rain and condensation, which prevents the selection from replicating the tropics used for common indoor pipes, giving priority to water-resistant, cryogenic and stable products。
Electric tropics
The temperature-free cryogenic tropics are more commonly used in open-air venting lines. It automatically regulates output power with ambient temperature, increases in temperature, automatically decreases heat power, does not cause local overheating burning, does not require complex temperature control equipment and is simple to install. Low temperature is resistant to tens of degrees below zero, the outer layer is thickened, uv-resistant, resistant to external sunburning, and the interface is sealed to meet the freezing requirements of an open-air shower supervisor and a bronchial base. For most of the southern open-air venting networks, as well as areas in the north where temperature is not extreme, the construction maintenance costs are low, the length of the pipes is flexible and the site can be tailored as needed。
Open-air nozzle line in cold northern areas, vents or blast-proof plant areas is not recommended. The constant power associated tropics could be considered, thermal power would be constant, the capacity for continuous heating would be stronger and the heating would be stable at low temperatures. The thermostat is used with precision and temperature and is suitable for freezing by a long-range shower supervisor. The constant-power product shield is corrosive and resistant to external wear and tear, except that it cannot be reduced at will, and it is necessary to account for the length of the pipe in advance and to accompany the power circuit. In the case of blast-proof areas such as chemical compounds, the explosive-proof type must be selected, and the fittings and trunks must match the blast-proof level to eliminate security hazards。
Electric tropics
There is also the tropics of assembly of mielectrics, which are of high mechanical strength, are resistant to pressure and bumping on the outer metallic layer, are highly resistant to water preservation and have a longer life. This is more secure when the spray pipe is often at risk of collisions, rockfalls, or high altitude, corrosive open-air scenes. It is high-temperature and blast-resistant, but it is costly to procure and construct, and is generally used to spray main main pipes for priority fire。
In addition to the selection, a few details cannot be ignored. The vent roads are thin-walled steel pipes, which are fitted with pressure-sensitive tape to stabilize the tropical zone, and external cooling layers are selected with waterproof temperature-preserving materials, which are supplemented by an outer protective layer to prevent rain from permeating the tropics. All lines and tails are sealed to protect against tides, open water is heavy and failure to seal is prone to electrical leakage. Pre-selection accounts for minimum ambient temperatures, piping lines, combined with blast resistance on site, and matching power specifications。
Pressure tape
Open-air shower pipes are frozen, with cores matching field conditions. General outdoor non-explosive scenes, with priority given to low-temperature auto-temperature telecommunications. It's cold, long distance from the main tube. There is a focus line for impact wear and tear, high blast protection requirements, with a selection of mics for the tropics. The selection of pairs of products and the regulation of construction are necessary to ensure that the network is free of ice during the winter and that fire protection systems are readily available。
