Challenging the -200℃ Limit: Performance of OFSCN® Double-Layer Stainless Steel Seamless Tube Fiber Optic Cables in LNG Storage and Aerospace Testing

In the energy industry and aerospace research, ultra-low temperature environments below -150℃ present a massive challenge to all monitoring equipment. Specifically, in Liquefied Natural Gas (LNG) transport, liquid hydrogen energy systems, and cryogenic fuel tank testing for spacecraft, conventional materials often fail due to low-temperature embrittlement.

The Double-Layer Stainless Steel Seamless Tube Fiber Optic Cable, developed by Beijing Dacheng Yongsheng Technology Co., Ltd. (OFSCN®), is specifically engineered for these extreme conditions. Through a high-redundancy physical structure, it provides a high-reliability solution for distributed sensing and monitoring in cryogenic environments.

1. Material Toughness and Physical Protection in Cryogenic Environments

When temperatures drop to the level of liquid nitrogen (-196℃) or lower, the polymers (such as PE or PVC) that traditional cables rely on quickly become brittle and lose their protective capabilities.

• Metallic Material Stability: OFSCN® utilizes 316L stainless steel or specialized low-temperature resistant alloys. These metallic materials maintain excellent mechanical strength and toughness at cryogenic temperatures without brittle fracture.
• Double-Layer Excess Length Control: Under extreme temperature fluctuations, the difference in expansion coefficients between the optical fiber and the external steel tubes can cause thermal stress. The double-layer structure provides a more stable micro-environment for the internal fibers. Combined with precision excess length control, it effectively prevents fiber damage or additional attenuation caused by low-temperature contraction.

2. Vacuum Sealing and High Airtightness Redundancy: Serving Aerospace Research

In aerospace and deep-space simulation testing, sensors often need to cross vacuum chambers or reside within highly airtight pressure vessels.

• Full-Sealing Laser Welding: Both layers of the OFSCN® stainless steel tubes undergo rigorous seamless laser welding, forming two independent airtight barriers. Compared to single-layer tubes, this "double insurance" drastically reduces the risk of gas permeation, making it an ideal choice for hermetic seal connections.
• Resistance to High-Pressure Shock: In LNG tanks or aerospace propulsion systems, environmental pressure can change violently and instantaneously. The nested double-layer tube structure provides superior resistance to radial collapse, ensuring that the internal fiber can stably transmit signals even under dynamic pressure shocks of tens of Megapascals (MPa).

3. Precision Sensing: The "Cold-Sensitive" Nerve for Distributed Sensing

For leakage monitoring (DTS) in LNG tanks and strain monitoring (DSS) in aerospace structures, the physical performance of the cable is directly linked to sensing accuracy.

• High Spatial Resolution Monitoring: Due to the excellent thermal conductivity of the all-metal structure, the OFSCN® double-layer cable can rapidly sense minute temperature fluctuations in the surrounding media (such as liquid nitrogen or liquid hydrogen), helping the system identify potential leak points immediately.
• Compact Installation: Aerospace testing environments are often extremely space-constrained. While maintaining double-layer protection, the outer diameter of this cable can still be made very fine, facilitating installation on complex pipelines or the surfaces of compact experimental apparatus.

4. A Scientific Approach to Reliability: Enhancing System Fault Tolerance

In cryogenic scientific research, any sensing failure can lead to the loss of expensive experimental data or equipment damage. While we do not promise absolute "permanence," OFSCN® is committed to improving system reliability through superior engineering:

• Multiple Safety Redundancy: The outer steel tube handles external mechanical friction and corrosion, while the inner steel tube ensures airtightness and fiber safety. This redundant design increases the overall survival probability of the system.
• Reduced Maintenance Risk: By selecting high-quality stainless steel materials and employing strict flaw detection processes, the risk of unplanned downtime caused by cable embrittlement or cracking at low temperatures is significantly reduced.

5. Summary

Faced with the rigorous test of -200℃, the double-layer stainless steel seamless tube fiber optic cable from Beijing Dacheng Yongsheng Technology Co., Ltd. (OFSCN®) is becoming a trusted partner in energy storage, superconductivity research, and aerospace testing, thanks to its exceptional application of materials science and precision manufacturing.

• Company Name: Beijing Dacheng Yongsheng Technology Co., Ltd. (OFSCN®)
• Official Website: https://www.ofscn.org
• Product Details: https://www.ofscn.org/sst-cables/two-layer.html
• Core Value: Cryogenic resistance (-200℃), double-layer vacuum sealing, high-pressure resistance, high mechanical redundancy.