The polyurethane sprayed polyethylene thermal winding preinsulation pipe production line independently developed by Huashida, consists of three parts: External shot blasting and derusting collector production line, polyurethane spraying production line, and PE winding production line.  
It is mainly used in pipeline engineering for oil, natural gas, and district heating. This production line uses an automated process to form a uniform insulation layer on the pipe surface, improving thermal efficiency and service life.It has significant economic and social benefits.

          Rust Removal                                                            Polyethylene wrapping                                                   Water cooling

Key Processes:
Steel Pipe Rust Removal: The steel pipe surface is treated to remove rust, ensuring a clean surface.
Preheating: The cleaned steel pipes are preheated using medium-frequency heating.
Polyurethane Foam Spraying: Polyurethane raw materials (isocyanate and polyol) are mixed using a high-pressure foaming machine and evenly sprayed onto the preheated steel pipe surface.
External Protection: Polyethylene (PE) material is used for wrapping.
Cooling and Shaping: Water cooling system.
Cutting: The insulated pipes are cut to the required length.
Trimming: The ends of the pipes are trimmed to ensure a flat end face, facilitating subsequent installation and connection.
Finished Product Output: Automatic unloading and packaging.

Technical Features:
1. Dust removal meets environmental standards(The three-level dust removal )
2. Suitable for the production of large-diameter insulation pipes
3. Automated operation of production lines
4. Spraying saves materials
5. Efficient extrusion of pipelines
6. Automated precision machining of pipeline interfaces

Advantage:
Awarded the first (set) technical equipment in Shandong Province
Evaluation Report on Standardization of Scientific and Technological Achievements in Qingdao City
Having multiple national patents

 

Product Parameters

 

Steel pipe diameter	Thickness of insulation pipe	Diameter of outer protective tube	Minimum wall thickness of outer protective layer
500	30-60	580-640	5.6
630	30-60	710-772	6.6
710	30-60	790-850	7.2
800	30-60	885-950	7.9
900	30-60	980-1054	8.7
1000	30-60	1090-1155	9.4
1100	30-60	1190-1250	10.2
1200	40-100	1316-1436	11
1400	50-100	1538-1638	12.5
1500	50-100	1638-1738	12.5

Production line parameter:
Steel pipe range: 206mm-1820mm
Processing capacity:≤250m²/h
Cleaning class: Sa2.5
Used material: ISO (isocyanate), POLY (premixed polyether polyols), PE
Main equipment: Shot blasting and rust removal production line, Polyurethane spray production line, PE winding production line.
 

Detailed Photos

Production line equipment Photos show


Rust Removal   

PE film jacket wrapping 

PE Jacket Water quenching 

 

Qingdao Huashida Machinery Co., Ltd was established in 2003. Since its inception, Huashida has focused on plastic polyurethane insulation pipe production line, 3LPE anticorrosion pipe production line, large diameter underground pipe production line and plastic pipe joints for 20 years. We always attach great importance to research and development,collaborating closely with Beijing University of chemical technology, Qingdao university of technology and scientific research institutions. by absorbing advanced technology home and abroad, after 22 years of endeavor we now rank one of the top 3 manufacturers in the industry in China.  Huashida machines have been well received in Saudi Arabia, Kazakhstan, Uzbekistan, United Arab Emirates, Turkey, Russia, etc.

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