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Pre Insulated Polyurethane Foam Insulation Steel Pipe

Brand ZCXH
Product origin Shandong,China
Delivery time 10-20 days
Supply capacity 1000 tons/ month

Pre Insulated Polyurethane Foam Insulation Steel Pipes combine strength and efficiency. The steel core ensures high pressure resistance, ideal for fluid transport, while polyurethane foam insulation minimizes heat loss, boosting energy efficiency in heating/cooling systems. A protective outer layer resists corrosion, moisture, and UV damage, extending service life in harsh environments. Pre-insulated design simplifies installation, reducing on-site work. Smooth inner walls optimize flow, suitable for municipal heating, industrial pipelines, and district cooling. Balancing durability, thermal performance, and ease of use, they deliver reliable, cost-effective operation long-term.

for Hot Water Pipeline Underground Pipe

Product Description

Pre Insulated Polyurethane Foam Insulation Steel Pipe (short for "PU pre-insulated steel pipe") is a composite pipe structure integrating a steel pipe (carrier layer), polyurethane foam (insulation layer), and outer protective layer (e.g., HDPE pipe). It is widely used in thermal fluid transmission (e.g., hot water, steam, district heating) and low-temperature medium transportation. Its core product features are as follows:

1. Exceptional Thermal Insulation Performance

High Thermal Resistance of PU Foam: The middle polyurethane (PU) foam layer has an extremely low thermal conductivity (λ ≤ 0.024 W/(m·K)), far lower than traditional insulation materials like mineral wool or glass wool. It forms a dense, closed-cell structure (closed-cell rate ≥ 90%) that effectively blocks heat transfer—minimizing heat loss during hot medium transmission (heat loss rate ≤ 2%) and preventing cold loss for low-temperature media.
Stable Insulation Effect: The PU foam layer is tightly bonded to the inner steel pipe and outer protective layer, with no gaps or air pockets that could reduce insulation efficiency. Even under long-term operation (e.g., 20+ years of district heating), it maintains stable thermal insulation performance without aging-induced degradation.
Wide Temperature Adaptability: It can operate safely in a broad temperature range, from -50°C (for low-temperature media like chilled water) to 120°C (for high-temperature hot water/steam), meeting the needs of diverse thermal engineering scenarios.

2. Excellent Corrosion & External Damage Resistance

Dual Protection for Inner Steel Pipe:

The inner steel pipe (usually hot-dip galvanized or anti-corrosion coated) resists corrosion from the transported medium (e.g., water, chemicals).
The outer PU foam and protective layer isolate the steel pipe from external corrosive factors (e.g., soil moisture, underground salts, industrial pollutants), avoiding external rusting or electrochemical corrosion.

Durable Outer Protective Layer: The outer layer is typically made of high-density polyethylene (HDPE) with high impact strength (≥ 20 kJ/m²) and wear resistance. It can withstand mechanical damage during transportation, burial, or construction (e.g., soil pressure, gravel impact) and resists ultraviolet (UV) aging for above-ground applications.
Suitable for Buried/Above-Ground Use: Its anti-corrosion and anti-damage properties make it adaptable to both buried (underground district heating networks) and above-ground (factory steam pipelines) installations, eliminating the need for additional anti-corrosion wrapping.

Specification

Foam Insulation

item	value
Section Shape	ROUND
Surface Treatment	Hot Rolled
Oiled or Non-oiled	Non-oiled
Place of Origin	Shandong，China
Alloy Or Not	Non-Alloy
Standard	ASTM
Technique	SAW
Grade	Q235/Q235B/Q345/Q345B
Delivery Time	15-21 days
Tolerance	±1%
Invoicing	by actual weight
Brand Name	ZCXH
Application	Boiler Pipe, Drill Pipe, Hydraulic Pipe, Gas Pipe, OIL PIPE, Chemical Fertilizer Pipe, Other, Structure Pipe, Fluid Pipe
Special Pipe	API Pipe, Other, Thick Wall Pipe, EMT Pipe
Thickness	2.1mm--60mm
Length	12M, 6m, 6.4M
Certificate	API, ce, Bsi, BIS, ISO9001
Processing Service	Welding, Cutting, Punching, Bending, Decoiling
Product name	Pre-insulation steel pipe
Keyword	welded round steel pipes
MOQ	5TON
Payment term	30%TT Advance + 70% Balance
Sample	Provide
Material	Q195-Q345 Q195/Q215/Q235/Q345/10#/20#
Shape	Round Pipe Tube
Length	1-12m
Packing	Standard Seaworthy Packing
Technique	Hot Rollled

3. High Structural Integrity & Long Service Life

Strong Layer Bonding: The PU foam is foamed in-situ between the steel pipe and outer HDPE layer, creating a seamless bond that integrates the three layers into a single unit. This prevents layer separation due to temperature changes, vibration, or soil settlement—ensuring structural stability over time.
Pressure Resistance of Inner Steel Pipe: The inner steel pipe (often seamless or ERW welded steel pipe) has high mechanical strength (tensile strength ≥ 345 MPa) and pressure-bearing capacity (working pressure up to 2.5 MPa), suitable for high-pressure thermal fluid transmission.
Long Lifespan: With comprehensive protection against corrosion, thermal aging, and external damage, the service life of pre-insulated PU steel pipes typically exceeds 30 years—far longer than ordinary steel pipes (10-15 years) and reducing the need for frequent pipe replacement.