Full name: hdpe external protecting tube polyurethane foam plastic, prefabricated directly buried insulating pipe are good heat preservation material should have low thermal conductivity;Not bad, when be affected with damp be affected with damp heat resistant performance is good, not a corrosive action on metals, more light and space;Has certain mechanical strength and avoid damage when a force;Easy processing, low cost and other characteristics.The commonly used thermal insulation material has: expanded perlite and its products, glass wool and its products, rock wool products, microporous calcium silicate, aluminum silicate fibre products, plastic foam, foam asbestos, etc.
Company strength is abundant, it can produce DN50mm - 3000 km DN1600mm polyurethane insulating pipe, 6 grade ethylene pipe production lines, using vacuum sizing, spray cooling, automatic cutting, an annual output of 30000 tons of polyethylene outer protection pipe.Glass fiber reinforced plastic polyurethane directly buried tube, 300 km, prefabricated steel set of directly buried steam pipe productivity of 100 km. 
Product specifications: DN50mm - DN1400mm
Use: the products are widely used in urban heating pipes, pipelines, electrical power.
Structure:
High temperature is prefabricated directly buried insulating pipe by steel pipes, FRP inner sheath, glass fiber reinforced plastic shell, whose character is: include high temperature resistant insulation thermal insulation layer, elastic seal, lubrication layer.The utility model effectively solves the big urban central heating in 130 ℃ to 600 ℃ high temperature heat losing use of prefabricated directly buried insulating pipe insulation, sliding lubrication and bare tube end waterproof problems.?
High temperature prefabricated directly buried insulating pipe is mainly composed of four parts.
Steel pipe (1) job: according to the requirements of the medium technology adopt the seamed steel pipe, seamless steel pipe, double sided spiral submerged arc welded steel pipe.
(2) the thermal insulation layer: the rigid polyurethane foam plastics.
(3) the protective shell: using high density polyethylene or glass fiber reinforced plastic.
(4) leakage alarm line: manufacturing high temperature, the prefabricated directly buried insulating pipe are close to the steel pipe insulation, embedding a warning line, once the pipeline leakage somewhere, conduction through the warning line, can be on the special detecting instrument alarm and show the leaking of accurate location and the size of the degree of leakage, in order to inform the maintenance staff quickly deal with a leaky pipe section, to ensure the safe operation of the heat supply network.
USES:
High temperature prefabricated directly buried insulating pipe are widely used in liquid, gas transmission pipeline, chemical pipeline heat preservation engineering, petroleum, chemical industry, the central heating network central air-conditioning ventilation pipe, municipal engineering, etc.High temperature is a kind of prefabricated directly buried insulating pipe heat preservation performance is good, safe and reliable, low engineering cost of prefabricated directly buried insulating pipe.Effectively solve the city central heating in 130 ℃ to 600 ℃ high temperature heat losing use of prefabricated directly buried insulating pipe insulation, sliding lubrication and bare tube end waterproof problems.High temperature prefabricated directly buried insulating pipe by adopting the technology of directly buried heating pipe, marks the development of heat pipe technology has entered a new starting point.