How LNG Storage Systems Can Reduce Cryogenic Leakage Risks Through Proper Valve Selection

H2 Industry Background

With the rapid growth of the global LNG market, storage systems operate under extreme low temperatures, often reaching -162℃. Valve reliability is critical to ensure safety and continuous operation. Cryogenic leakage can cause energy losses and safety hazards.

H2 Common Operational Challenges

• Cryogenic Leakage Risk: Sealing materials can harden or fail at ultra-low temperatures.
• Thermal Contraction Effects: Metal contraction may lead to clearance increases if not properly designed.
• Long-Term Reliability: Valves must support continuous operation for years without seal failure.

H2 Key Selection Considerations

H3 Material Selection

Valve bodies typically use SS304, SS316, 316L; seals use PCTFE, maintaining performance between -196℃ and +80℃.

H3 Extended Bonnet Design

Isolates the stem from the cold medium, reducing frost formation and thermal stress.

H3 Standards and Verification

Selection should comply with BS6364, API 6D, ISO 28921, validated by leak tests and low-temperature cycling.

H2 Application Examples

LNG terminals using SS316/PCTFE cryogenic globe valves have achieved zero leakage in over three years of continuous operation.

2️⃣ Understanding BS6364 Requirements for Cryogenic Ball Valve Performance

H2 Standard Overview

BS6364 defines material, design, and sealing performance requirements for low-temperature valves. Ball valves in LNG, LN2, and LOX service must maintain seal stability under cryogenic conditions.

H2 Sealing Challenges

• Stem Frosting: Frost accumulation can hinder valve operation.
• Seal Failure: PCTFE seals must retain elasticity to prevent leakage.
• Thermal Contraction Effects: Metal shrinkage can affect seal compression.

H2 Standard-Based Solutions

• Materials such as 316L, Inconel are selected for cryogenic toughness.
• Extended bonnet design isolates the stem from cold media.
• Seals undergo BS6364 low-temperature cycling and leak testing.

H2 Industry Applications

BS6364-compliant ball valves are widely used in LNG storage, transport, and air separation units, ensuring zero leakage and reliable operation.

3️⃣ Reducing Unplanned Downtime in Air Separation Units Through Valve Engineering

H2 Industrial Background

Air separation units producing LOX and LN2 rely heavily on reliable cryogenic valves. Unplanned downtime can interrupt production, increase energy costs, and compromise safety.

H2 Operational Challenges

• Insufficient long-term reliability: Seal failure can trigger unexpected shutdowns.
• Maintenance difficulty: Frequent disassembly is often required.
• Extreme operational conditions: Alternating low temperature and high pressure increases failure risk.

H2 Engineering Solutions

H3 Materials and Seals

SS316/316L body with PCTFE seals ensures stable performance between -196℃ and +80℃.

H3 Structural Optimization

Extended bonnet and low-temperature spring designs reduce frost and stem sticking.

H3 Standard Compliance

Testing according to BS6364, ISO 21011, including cycling and leak testing, ensures long-term reliability.

H2 Application Impact

Optimized cryogenic ball valves significantly reduce unplanned downtime, extend maintenance intervals, and enhance both safety and production continuity.