Hebei Municipal Administration Thermal insulation pipe straight pin Hot spring foaming insulation pipe factory
polyurethane Directly buried insulation pipe surface treatment Mainly mechanical treatment, including shot peening and shot blasting. The shot peening technology is to make Abrasive materials High speed flow, impact and friction are used to remove rust, oxide scale, pollutants and attachments on the steel surface. After cleaning, the steel will not change color, and will form appropriate cleanliness and roughness. For boilers with large steel consumption, petrochemical machinery enterprises usually adopt shot blasting technology, which means that under the action of high-speed rotating polishing head blades, abrasives are thrown to the steel surface with large radial and tangential speeds, so as to remove impurities.
In addition, we can also use high-pressure water treatment, high-pressure water plus sand cleaning and other methods. These methods have good removal effect, high efficiency, significant comprehensive economic benefits, and can effectively extend the life of directly buried insulation pipes. Therefore, in recent years, the application development is very rapid. Low heat loss and energy saving. The thermal conductivity of the prefabricated polyurethane directly buried insulation pipe is λ=0.013-0.03kcal/m · h · oC, which is much lower than other commonly used pipeline insulation materials in the past, and the insulation effect is improved by 4~9 times. Moreover, its water absorption is very low, about 0.2kg/m2. The reason of low water absorption is that the closed cell rate of polyurethane foam is up to 92%.
The low thermal conductivity and low water absorption, together with the insulation layer and the high density polyethylene or glass fiber reinforced plastic protective shell with good waterproof performance outside, have changed the situation of traditional trench laying of heat supply pipes "wearing wet cotton padded jacket", greatly reducing the overall heat loss of heat supply pipes. The heat loss of the heat network is 2%, less than the standard requirement of * * * 10%.
Polyurethane seamless insulation pipe composition:
(1) Working steel pipes: according to the technical requirements of the transmission medium, seamed steel pipes, seamless steel pipes and double-sided submerged arc spiral welded steel pipes are used respectively.
(2) Thermal insulation layer: rigid polyurethane foam.
(3) Protective shell: high-density polyethylene or glass fiber reinforced plastic.
(4) Leakage * * * line: When fabricating high-temperature prefabricated directly buried insulation pipes, * * * line is embedded in the insulation layer near the steel pipe. Once leakage occurs somewhere in the pipe, through the conduction of the alarm line, * * * on the * * * detection instrument can * * * show the exact location of the leakage and the size of the leakage degree, so as to notify the maintenance personnel to quickly deal with the leaking pipe section and ensure the safe operation of the heating network.
The manufacturer supplies directly buried heating pipes. The polyurethane directly buried insulation pipe manufacturer prefabricates directly buried polyurethane insulation pipes. The prefabricated polyurethane pipe manufacturer's quotation system insulation pipes are divided into two types: plastic sheathed steel insulation pipes (high-density polyethylene directly buried insulation pipes) and steel sheathed steel insulation pipes (high-temperature steam insulation pipes).
Plastic sheathed steel insulation pipe is closely combined by high-density polyethylene outer pipe, polyurethane foam insulation layer and inner working steel pipe.
