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