Glass fiber reinforced plastic shell prefabricated directly buried insulation pipe
Glass fiber reinforced plastic shell prefabricated directly buried insulating pipe
The first layer: the work steel pipe layer, according to the requirements of customers design and seamless tube (GB8163-87) is generally selected spiral welded pipe (GB9711-88, SY/T5038-92) and straight seam welded pipe (GB3092-93). Steel tube surface after advanced shot blasting derusting processing, steel pipe descaling grade level can reach the Sa2 GB8923-1988 standard, the surface roughness can reach GB6060.5 R = 12.5 micrometers - 88 standard. Steel tube surface decontamination cleaning after besmear to brush a layer of cyanide anti-corrosion material, its function is a waterproof, 2 it is to improve the thermal insulation layer and the bonding between steel tube surface, make it to form a whole.
The second layer: polyurethane thermal insulation layer, using high pressure foaming machine in steel pipe in special steel in the mould cavity is formed between a one-time injection of rigid polyurethane foam plastics concentrate. That is commonly known as the "mold foaming process. Polyurethane foam is full, facilitate direct inspection there is any quality problem. But its action is a waterproof, thermal insulation, 3 it is to support the heat-supply self-respect. When the temperature of the medium is: - 50 ℃, 120 ℃, the selection of rigid polyurethane foam plastic insulation layer; When the temperature of the medium for: - 50 ℃, 150 ℃, use rigid poly semicarbazide acid ester foam plastic insulation layer.
Glass fiber reinforced plastic shell products prefabricated directly buried insulating pipe are used
When the temperature of the medium is: - 50 ℃, 150 ℃ within the scope of all kinds of medium heat/cold engineering, it is widely used in urban collective heating, geothermal development, coal, oil, ports, chemical and other industries engineering of heat/cold, because of the glass fiber reinforced plastic shell is better than the weather resistance of high density polyethylene, it is especially suitable for buried alternating with overhead laying the heat-supply pipeline laying and coastal areas.