PU Sprayed Foaming HDPE Winding Preinsulation Pipe Continuous
Production Line
Product description
Vacuum calibrating method pre-insulated pipe outside casing
extrusion line is the most advanced and popular machinery in the
world. HSD brand absorbs the advanced technology from German and
improve to meet development. Especially compared with internal
pressure method, Vacuum calibrating method is much better than it
for stiffness, pressure resistance and surface smooth.
Pipe structure
Rigid polyurethane spraying polyethylene winding prefabricated
directly buried insulation pipe consists of steel working pipe, spraying polyurethane rigid foam insulation layer and
winding polyethylene outer protective pipe. See the following
figure for product structure
Technological flow:
Technological flow of the polyurethane coating steel preinsulated pipe equipment:
1. Remove rust from steel pipe surface
2. preheat the steel pipe to get it ready for polyurethane spraying
3. Spray polyurethane evenly on steel pipe outer surface
4. Wrap melted HDPE strap around the PU foam
5. Trim the pipe ends
Other supplier racks
The integrated welded structure, without adjustment devices, cannot
be installed when the ground is uneven. The height of the stand
cannot be adjusted, resulting in uneven rolling of steel pipes on
the stand, too fast rolling, or difficult rolling, which poses a
safety hazard.
Main accessories
| Item | Standard value | Tested value |
| Pipe diameter | DN300-DN1620 | |
| OD contraction rate | <=2% | 1.46 |
| Radial shear strength | ≥0.12(23±2ºC)MPa
≥0.08(140±2ºC)MPa | 0.14
0.09 |
| Shock strength | (-20ºC, 3Kg, hammer falls from 2 meters high) No visible cracks | OK |
| Peak Operating temperature | 140ºC | 150ºC |
| Continuous operating temperature | 120ºC | 140ºC |
| Service life | ≥30 years | OK |
