Polyurethane insulated steel pipe

Polyurethane (PUR) insulated steel pipes are high-performance prefabricated piping systems designed for efficient thermal insulation in heating, cooling, and industrial fluid transport. They consist of a steel inner pipe, polyurethane foam insulation layer, and an outer protective casing, ensuring minimal heat loss, corrosion resistance, and long-term durability.

Structure & Composition

1. Inner Steel Pipe (Working Pipe)

Material: Carbon steel (Q235B, 20#, etc.) or stainless steel (304/316 for corrosive media).

Function: Transports hot water, steam, oil, or other high-temperature fluids.

Pressure Rating: Typically 1.6MPa–2.5MPa (customizable).

2. Polyurethane (PUR) Foam Insulation Layer

Material: Rigid closed-cell polyurethane foam (density: 60–80 kg/m³).

Thermal Conductivity: 0.022–0.033 W/m·K (excellent insulation).

Thickness: 30–100 mm (adjustable based on temperature requirements).

Function: Minimizes heat loss (≤5%) and maintains fluid temperature.

3. Outer Protective Casing

Options:

HDPE (High-Density Polyethylene): Lightweight, waterproof, and corrosion-resistant.

Steel Casing (Galvanized/3PE Coated): Extra mechanical strength for harsh environments.

FRP (Fiberglass Reinforced Plastic): Chemical and UV resistance for above-ground use.

Function: Protects insulation from moisture, soil pressure, and mechanical damage.

4. Optional Leak Detection System

Embedded alarm wires detect insulation damage or leaks for early warning.

Key Features & Advantages

✔ Excellent Thermal Efficiency – Reduces heat loss by 90%+ compared to uninsulated pipes.
✔ Strong & Durable – Steel structure withstands high pressure (up to 2.5MPa).
✔ Corrosion-Resistant – Outer HDPE/steel casing prevents rust and degradation.
✔ Long Lifespan – 30–50 years with minimal maintenance.
✔ Waterproof & Moisture-Proof – Closed-cell foam prevents water absorption.
✔ Prefabricated Design – Factory-made for fast installation and consistent quality.
✔ Wide Temperature Range – Suitable for -50°C to +150°C (steam applications require modifications).

Applications

District Heating Systems (Hot water, steam networks).

Oil & Gas Pipelines (Insulated crude oil, LNG transport).

Industrial Process Piping (Chemical plants, power stations).

Chilled Water Supply (Central cooling systems).

Geothermal Energy Systems (Ground-source heat exchangers).