The low thermal conductivity and low water absorption, coupled with insulation layers and high-density polyethylene or FRP shells with good water-repellent properties, have changed the status of the traditional trench laying heating pipe “wet cotton padded jacket”, which greatly reduced the number of heating pipes.(5) Outer protective pipe: An outer protective layer that protects the insulation from groundwater, supports the core pipe, and can withstand a certain pressure.055w (mk) Microporous calcium silicate (density ≤220kg/m3), magnesium silicate, rock wool (density ≥110kg/m3) can be used depending on the structure, and the moisture content of the material is also good Temperature, compressive strength and other indicators can also meet relevant requirements.056w/(mk), and heating line shrinkage ≤ 4%. Polyurethane rigid foam, density 55-65kg/m3, compressive strength ≥ 0. Spiral tubes are used for low heat loss and can save energy. The surface of the core tube removes rust, grease, moisture, and other contaminants.027w/(mk), water absorption ≤ 3%, applicable temperature ≤ 140°C. The reason for the low water absorption is that the closed cell ratio of the polyurethane foam is as high as about 92%.Spiral tube thermal conductivity: λ = 0. The soundproofing performance of the SSAW steel pipe is very good, to avoid the sound of liquid flowing in the pipe during transportation. This product generally uses high-density polyethylene (PE) as the outer protective tube, but in areas with high water levels or surface water, steel outer protective tubes must be used. According to different materials, it is generally divided into steel outer tube, high density polyethylene plastic outer tube, glass fiber reinforced plastic outer tube, composite outer tube and so on.According to calculations by related departments, dual-control heat supply pipes can generally be reduced by 25% of the construction cost (using FRP as a protective layer) and 10% (using high-density polyethylene as a protective polyurethane foam toys layer). The protective cushion is generally made of aluminum silicate felt, density ≤ 192kg/m3, room temperature thermal conductivity ≤ 0.The SSAW steel pipe has a strong thermal insulation property, which can ensure that the temperature of the internal transport material is not changed by the outside world and has good cold resistance in winter. Room temperature thermal conductivity ≤ 0. At the same time, the spiral tube can be preserved and does not absorb water, so that the installation position of the pipeline is not limited and can be used at various locations. The overall heat loss, thermal network heat loss is 2%, less than the international standard of 10%. Steel outer tube material properties and tolerances are in compliance with relevant national or industry standards. In addition, its water absorption is very low, about 0.03kcal/mhoC, much lower than other commonly used pipe insulation materials, insulation effect increased by 4 to 9 times.(4) Insulation layer: Insulation layer made of high temperature resistant inorganic insulation material. Spiral pipe construction is simple and efficient, high efficiency, reduce capital costs.2 kg/m2.013-0. The outer surface of the steel tube is shot blasted..Insulation large diameter spiral pipe structure:(1) Core pipe: Working steel pipe for steam delivery.(3) Organic insulation layer: insulation layer made of organic insulation material. When the core pipe is made of spiral welded steel pipe and the inorganic insulation layer is a hard material, a protective cushion layer is provided.(2) Protection cushion: The sandwich between the core tube and the insulation layer to prevent the inorganic insulation from being damaged due to displacement of the core tube.2MPa, normal temperature thermal conductivity ≤ 0.Core tube material properties, outer diameter dimensions, dimensional tolerances, and minimum wall thickness are in compliance with the relevant national or industry standards.
留言列表
