LNG (liquefied natural gas) operates at extremely low temperatures (approximately -162°C) during transportation and storage, placing extremely high demands on pipeline insulation materials. LNG elastic felt, a flexible insulation material specifically designed for low and ultra-low temperature conditions, is widely used in LNG pipeline systems.

I. Core Requirements for Insulation Materials in LNG Pipelines

The operating environment of LNG pipelines has the following characteristics:

Long-term operation at extremely low temperatures

Significant pipeline contraction due to cold

Large temperature variations

Complex routing and weld joints

High requirements for preventing condensation and frost

Therefore, insulation materials must not only possess stable low thermal conductivity but also consider flexibility, crack resistance, and structural adaptability.

II. Structural Characteristics of LNG Elastic Felt

LNG elastic felt is typically made from highly elastic fiber materials through a special process. Its internal structure is porous and interwoven, possessing the following characteristics:

High flexibility, adaptable to pipeline shrinkage and deformation due to temperature changes.

Stable fiber structure, not easily pulverized.

Strong adaptability to multi-layer wrapping construction.

Can be used in conjunction with moisture-proof and protective layer systems.

This structure makes it particularly suitable for low-temperature insulation of straight pipes, elbows, valves, and irregularly shaped parts.

III. Insulation Mechanism in LNG Pipelines

1. Inhibition of Heat Conduction

LNG elastic felt contains a large layer of still air. Air itself has a low thermal conductivity, effectively reducing the transfer of external heat to the pipeline.

2. Reduction of Cold Loss

Multi-layer wrapping forms a continuous insulation layer, reducing cold leakage from the pipeline and helping to maintain the low-temperature stability of LNG.

3. Relief of Cold Contraction Stress

The elastic structure absorbs the deformation of the pipeline caused by temperature differences, preventing cracking and detachment of rigid insulation materials.

4. Preventing Condensation and Frost

With sufficient thickness and a moisture-proof layer, condensation and frost on the outer surface can be effectively prevented.

IV. Typical Applications of LNG Elastic Felt in Pipeline Systems

LNG Transmission Pipelines

Cryogenic Storage Tank Connection Pipelines

Cold Box and Cryogenic Module Pipelines

Valve, Flange, and Expansion Joint Locations

Complex Routes or Space-Confined Areas

In these locations, LNG elastic felt is easier to install and maintain than rigid insulation materials.

V. Summary of Application Advantages

Suitable for -160℃ ultra-low temperature conditions

Flexible structure with good crack resistance and cold shrinkage resistance

Enables continuous and complete insulation systems

Reduces energy loss during cryogenic operation

Improves the safety and stability of LNG pipeline systems

In LNG pipeline engineering, the reliability of the insulation system directly affects operational safety and energy efficiency. LNG elastic felt, with its low-temperature adaptability, flexible structure and stable thermal insulation performance, has become one of the important thermal insulation materials in the field of LNG pipeline cryogenic insulation, and is especially suitable for application scenarios with high requirements for structural adaptability and long-term stability.