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Products introduction

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1. Performance of outer protective tubes: the products are black (in the conditions that one-step manufacturing technique is used or users have special requirements, they are yellow; light aging speed of the yellow or colorless and transparent tubes is very high, so they are not used generally), and have the advantages like high strength, good toughness, good sealing property, corrosion resistance, low temperature resistance, impact resistance, easy welding, easy construction and long service life, etc. In the thermal insulation pipes production and area heat-supply engineering, they have been extensively adapted home and abroad.

2. Functions of outer protective tubes: outer protective tubes are auxiliary products of producing and prefabricated thermal insulation pipes (pipe in pipe) with two-step method, mainly used for external protecting layer of thermal insulation materials. Outer protective tubes provide efficient protection for polyurethane thermal insulation layers, and play a role in being waterproof, anti-corrosion, anti-aging, impact resistant, etc.

3. The usage temperature of outer protective tubes:??thickness of thermal insulation layers of thermal insulation pipes should ensure outer insulation to be used normally when the temperature of external protecting layers are??—50℃～+50℃.

4. Production capacity: At present, our company is owning 1 outer protective tube production line, and it has been put into production; our company can produce 500km DN90-DN1800mm various high density polyethylene outer protective tubes each year.

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Executive standards

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1. GB/T29047-2012?High Density Polyethylene Outer Protective Tubes Rigid Polyurethane Foamed Plastic Prefabricated Directly Buried Thermal Insulating Pipes and Pipe Fittings?was published on Dec. 31, 2012, and implemented on Sep. 1, 2013.

2. CJ/T114-2000?High Density Polyethylene Outer Protective Tubes Polyurethane Foamed Plastic Prefabricated Directly Buried Thermal Insulating Pipes?was published on Apr. 12, 2002 and was implemented on Oct. 1, 2000.