Insulated Steel Pipe Production Process

Product Introduction

Polyurethane insulated pipes, fully named: Prefabricated Directly Buried Insulated Pipes with High-Density Polyethylene (HDPE) Casing and Polyurethane (PU) Foam, are composed of a working steel pipe (for medium transport), a polyurethane insulation layer, and an outer HDPE protective casing. These three layers are bonded sequentially outward using specialized equipment.

Characteristics

1 Reduced Project Costs.

2 Low Heat Loss, resulting in energy savings.

3 Excellent Corrosion and Insulation Properties, leading to a long service life.

4 Minimal Land Usage, Rapid Construction, and environmental benefits.

5 Safety.

Prefabricated directly buried insulated pipes with HDPE casing and PU foam are highly regarded for their superior performance, convenient installation, and long service life. Their structure consists of three parts: an outer protective layer, an insulation layer, and an anti-permeation layer. The outer protective layer material can be HDPE jacket pipes, fiberglass reinforced plastic (FRP), or other materials. Installation methods include direct burial, overhead installation, and duct laying.

Applications:

The application range of polyurethane insulated pipes is extensive, including:

Liquid and gas transmission pipeline networks
Chemical pipelines
Insulation engineering
Petroleum industry
Centralized heating networks
Central air conditioning ventilation ducts
Municipal engineering projects

Production Process Flow:

The production process flow for polyurethane insulated pipes is as follows:

Raw Material Preparation: Prepare raw materials such as polyurethane components, isocyanate, catalysts, blowing agents, and fillers according to specific formulas.
Pipe Preparation: Process and prepare the steel pipes, including steps like cutting, grinding, and cleaning.
Primer Spraying: Apply a primer to the pipe surface to enhance adhesion for the subsequent layers.
Anti-Permeation Layer Application: Coat a barrier layer onto the pipe surface to prevent polyurethane foam from penetrating it.
Foaming: Spray the mixed polyurethane ingredients onto the pipe surface using specialized equipment, ensuring even coverage to form a uniform foam layer.
Curing: After foaming is complete, allow the pipe to sit for a period to cure and fully harden.
Cutting: Cut the cured polyurethane insulated pipes to the required lengths.
Packaging: Package the finished polyurethane insulated pipes for transportation and use.

Production Process