Precision Pre-Insulated Pipe Extrusion Line with Vacuum Calibrating
Technology
This fully automated production line is engineered to manufacture
precision pre-insulated bonded pipe systems in a single, continuous
pass. A vacuum-calibrated crosshead immediately after the PE
extruder pulls the melt against a precision sleeve, ensuring
uniform wall thickness, ovality ≤ 0.5 % and surface roughness Ra ≤
6 µm at line speeds up to 2.5 m/min. Closed-loop vacuum control
(±0.2 kPa) automatically compensates for melt-temperature and
haul-off variations, eliminating diameter drift and reducing scrap
to < 1 %. The result is a perfectly round, dimensionally stable
outer jacket that locks the polyurethane foam and carrier pipe into
one composite structure—ready for direct burial or offshore
reel-lay without secondary sizing or machining.
Technical Prameters:
| Style | PE-110/600 | PE-365/760 | PE-655/1380 | PE-960/1680 | PE-1054/1860 |
| Main Extruder | SJ-75/33 | SJ-90/33 | SJ-120/33 | SJ-150/33 | SJ-150/33 |
| Pipe diameter | Φ110-600mm | Φ365-760m | Φ655-1380mm | Φ960-1680mm | Φ1054-1860mm |
| Capacity | 250-350kg/h | 400-500kg/h | 700-900kg/h | 1000-1200kg/h | 1000-1250kg/h |
| Installed power | 160kw | 240kw | 480kw | 580kw | 580kw |
| Length | 26m | 32m | 36m | 40m | 45m |
The core technology of Huastar PE960-1880 insulation pipe
production line is at the leading level in China, and a number of
innovation points and design concepts have filled the gaps in
China, among which four core technologies such as solid-liquid
phase separation screw, spiral diverter head, DCL human-machine
dialogue technology, and real box external manipulator technology
are the first or first applied in the industry. This product is
also the only domestic production line capable of manufacturing
1880mm large diameter insulation pipe.
HDPE Jacket Process Flow:
Vacuum feeding PE granule-->hot air dry material-->extrusion
plasticizing-->mold shaping-->Vacuum sizing-->water
cooling-->Pulling out-->cutting pipe-->carrier laying-off
pipe
Composition of Equipments:
1.hopper dryer ⒉ Single Screw Extruder ⒊ extrusion mould die ⒋ Head
bracket ⒌ Vacuum calibration device ⒏ Water cooling tank ⒐ haul-off
⒑ Planetary cutting machine 11.Pipe bracket ⒓. Loader 13. PLC
PU Foaming Pre-insulated Pipe Production process Flow:
The production process of "pipe in pipe" (PU Foaming Pre-insulated Pipe) mainly includes three steps: surface pretreatment of steel pipe,
production of HDPE outer protective pipe and production of
insulation layer.
Rigidity due to the presence of strong ties between the steel pipe
layer polyurethane insulation and jacket pipe and provides pre-shot
blast or blast cleaning the surface of the steel pipe, optimum
performance polyurethane insulation, corona surface of polyethylene
pipe shell.The production steps of insulation layer are as follows: firstly,
the steel pipe is penetrated into the high-density polyethylene
outer protection pipe to form a casing structure, and the supports
are evenly arranged in the annular space between the steel pipe and
the high-density polyethylene outer protection pipe, and the two
ends are sealed by flanges; secondly, the casing is hoisted on the
foaming platform, and the polyurethane foaming material is injected
into the casing by high-pressure foaming machine; finally, the
polyurethane material is foamed After curing, the sealing structure
at both ends is removed to complete the production process of the
insulation layer.
gas/oil /water pipeline Puf Pre-Insulated Pipe PE shell casing
plastic Machinery Advantages:
Significantly increases the reliability of the pipeline in the PUF
insulation system operational availability of remote condition
monitoring PUF insulation, which allows to detect and repair
leaking coolant, preventing accidents typical for thermal networks
of other designs.
Highly cost-effective use of pipelines in the foam insulation
define the following parameters:
Simplifying the construction, maintenance and repair;
Increased service life of 30-40 years (traditional types of
pipelines - 5-10 years);
Reduction of heat losses to 8% (traditional types of pipelines -
30-40%);
Reducing capital costs by 15-20% (not required construction of
concrete channels and chambers for valves);
Reduced operating costs by 9 times;
Reduction in repair costs 3 times.
Our Advantages
-small dimension
-high degree of automation, can be operated by one person, saving
labor costs.
-long service life.
-high-efficiency extruder gives larger output and stable
performance.
-pipe wall is average and smooth
-no waste of raw material
-once forming. No need to trim the edge.
Packaging & Shipping
Exhibition
