Product introduction

Prefabricated directly buried insulation pipe (produced by "pipe-in-pipe" method)

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Scope of application

 

This product is suitable for conveying medium temperature within the range of -30℃ ~ 140℃, underground directly buried pipeline, suitable for urban central heating, residential heating pipe network. Adopts the "pipe in pipe" production process to produce the high density polyethylene outer protective pipe polyurethane foam plastic directly buried prefabricated insulation pipe, the product quality meets the standard requirements. Steel pipe after rust removal, anticorrosion treatment; Polyurethane foam insulation layer, good thermal insulation effect, transport 80℃ hot water temperature drop per km <1℃; High density polyethylene outer protective pipe, made of high quality high density polyethylene, has high mechanical strength, good weather resistance, superior sealing performance, can be used in the permafrost and high water level geological conditions for a long time.

 

Execution standard

 

"High density polyethylene outer protective pipe polyurethane foam prefabricated directly buried insulation pipe" CJ/T114-2000

 

Technical indicators

 

Polyethylene outer guard tube

Project

Unit

Performance requirement

Density

Kg/m³

≥940

Carbon black content

%

2.5±0.5

Tensile yield

MPa

≥19

Elongation at break

%

≥19

Longitudinal retraction rate

%

≤3

Long term mechanical properties

h

≥1500

 

Polyurethane foam

Project

Unit

Performance requirement

Core density

Kg/m³

≥60

Radial compressive strength

MPa

≥0.3

High temperature water absorption

%

≤10

Obturator ratio

%

≥88

Thermal conductivity

W/m.k

≤0.033

 

Finished product pipe

Project

Unit

Performance requirement

Increase rate of outer diameter

%

≤2

Impact resistance

/

There is no visible crack on polyethylene outer pipe

Axial shear strength

MPa

≥0.12（23℃±2）
≥0.08（140℃±2）

 

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Precoated hot dip zinc steel tube

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3 PE anticorrosive pipe