Improve living comfort!
There are many advantages of district heating and cooling. It can improve heat energy utilization
efficiency and reduce the loss of cooling capacity of central air conditioning ventilation pipes.
Long distance heating pipeline projects increases rapidly so that polyurethane insulated direct
buried pipe demand is also growing. We work hard to improve people's quality of life.
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ADVANTAGE
ADVANTAGE -
PROCESS
PROCESS -
TECHNOLOGY
TECHNOLOGY
ADVANTAGE
Pipes insulated with rigid polyurethane foam have been successfully used for more than 40 years throughout the world - it secures the energy transportation wherever hot or cold area. Polyurethane as the best suitable insulation material minimizes the exchange of heat with the external environment. Rigid polyurethane foams have unrivalled insulating properties which, together with excellent mechanical properties, high heat resistance and low water absorption.Polyurethane foam has good compatibility with many materials, provides good adhesive force, and is tightly bonded with substrate.
PROCESS
Pipe is prefabricated in the factory,pouring process and spraying process mainly. Pipe joint engineering can be done manually or mechanically on site. Pouring method: polyurethane material is injected by high pressure foaming machine between the steel pipe and high density polyethylene outer protective layer, to form a firm whole between the steel tube and the outer sleeve tube and the insulation layer three. Spraying Method: mixed polyurethane raw material evenly and spray onto continuous tube surface, wait polyurethane slowly forming up, and the extrusion equipment will melt polyethylene sheet continuous winding to the outer surface of polyurethane insulation layer, untill a continuous dense polyethylene outer sheath is achieved.
TECHNOLOGY
Rich experience to meet the requirements of different pipe diameters or construction site conditions
Application
GB Standard
Typical Performance
|
Product property |
|
Index |
|
Foam density |
kg/m³ |
≥60 |
|
Thermal conductivity@50°C |
W/(m·K) |
≤0.033 |
|
Closed-cell rate |
% |
≥88 |
|
Compressive strength |
MPa |
≥0.3 |
|
Water absorption rate （100 °C，90min） |
% |
≤10 |
|
Insulating layer thickness(surface temperature of outer protective tube) |
℃ |
≤50 |
* GB/T 29047-2012 Prefabricated directly buried insulating pipes and fittings with polyurethane foamed-plastics and high density polyethylene casing pipes
