Spring Energized Seal for LNG Filling Nozzle

Commercial Terms of Products:

Overview

Tesel Seal designs and manufactures spring-energized seals for LNG filling nozzles and cryogenic dispensing systems. These seals ensure reliable performance under extreme low-temperature conditions down to -196°C.

Featuring a high-performance polymer jacket and H-type alloy spring, they provide stable sealing force, excellent wear resistance, and long service life during repeated operation.

Widely used in LNG refueling stations, transport systems, and dispensing equipment.

Technical Specifications

Key Features and Performance Advantages

• Cryogenic Compatibility – Maintains sealing performance at temperatures down to -196°C, ideal for LNG applications.

• Durable H-Type Spring Energization – Alloy spring ensures continuous radial force on the sealing lip, compensating for wear and thermal contraction.

• High Chemical Resistance – Polymer material resists LNG, hydrocarbons, and other chemicals commonly present in fueling systems.

• Low Friction Design – Reduces wear on nozzle surfaces and ensures smooth insertion/removal of filling nozzles.

• Long Service Life – Optimized materials and spring design provide extended operational cycles with minimal maintenance.

• High Wear Resistance – Suitable for repeated mechanical engagement and high-cycle refueling operations.

• Universal Compatibility – Adaptable to a variety of LNG filling systems, including major domestic and international nozzle models.

• Safety Assurance – Prevents leakage and ensures system integrity in high-pressure cryogenic environments.

• Easy Installation – Pre-assembled, dimensionally stable, and suitable for rapid field replacement.

• Compact and Efficient – Low-profile design ensures tight sealing without adding excessive size to the nozzle interface.

Product Structure and Design

Tesel Seal spring energized seals are designed as H-type spring composite sealing systems:

• High-performance polymer jacket for primary sealing and chemical resistance
• H-type alloy spring to maintain continuous radial sealing force
• Optimized lip geometry for tight fit and leak prevention
• Multi-component support ensures stable performance under repeated mechanical cycles

This configuration ensures multiple sealing interfaces and consistent contact pressure across the nozzle surface. The H-type spring distributes load evenly, reducing deformation and enhancing long-term sealing performance in cryogenic LNG applications.

Applications

Tesel Seal spring energized seals are deployed in critical LNG fueling operations:

• LNG Filling Nozzles – Ensures leak-tight operation during vehicle or tanker refueling, maintaining safety and system efficiency.

• LNG Refueling Stations – Used in dispenser interfaces to prevent hydrocarbon leakage and maintain cryogenic containment.

• Transport LNG Tankers – Provides dynamic sealing for loading and unloading operations under extreme temperature conditions.

• Offshore LNG Transfer – Reliable performance for marine LNG transfer lines and shipboard nozzle connections.

• Vehicle LNG Tanks – Maintains integrity during repeated nozzle engagement, preventing gas leaks in transport vehicles.

• International Equipment Compatibility – Adaptable to both domestic and foreign nozzle standards, supporting a wide variety of systems.

Design Considerations

When selecting spring energized seals for LNG filling applications, key factors include:

• Cryogenic Temperature Exposure – Materials must retain flexibility and sealing force at extreme low temperatures.

• Repeated Mechanical Motion – Seal must withstand insertion and withdrawal cycles without deformation.

• Chemical Resistance – LNG, hydrocarbons, and trace contaminants require chemically robust materials.

• Pressure Variations – Seal must maintain integrity under moderate pressure fluctuations typical of refueling systems.

• Nozzle Geometry – Proper fit and lip engagement are critical for leak prevention and safety.

• Material Creep and Fatigue – Spring design compensates for polymer creep over long-term operation.

Tesel Seal provides engineering support to ensure proper material selection, spring load design, and dimensional tolerances for optimal performance.

Failure Analysis and Optimization

• Lip Wear – Repeated nozzle engagement can wear polymer surfaces. H-type spring energization and low-friction polymer reduce wear rates.

• Thermal Contraction Effects – Cryogenic temperatures can reduce sealing lip contact. Spring ensures continuous radial pressure.

• Leakage Risk – Proper lip geometry and multi-component support prevent leakage under operational conditions.

• Chemical Attack – LNG and hydrocarbons are highly compatible with selected polymer, preventing degradation.

• Installation Misalignment – Precise tolerances and Tesel Seal guidance reduce risk of improper seating.

Optimizing performance requires engineering review of nozzle geometry, spring load, polymer selection, and operational temperature cycles to guarantee reliable, long-term operation.

Common Questions and Answers

• Can these seals operate in LNG refueling stations? – Yes, designed specifically for cryogenic nozzle interfaces.

• Are the seals compatible with Caterpillar, XINYA, and Bitu nozzles? – Yes, the seals can be adapted to multiple international standards.

• What is the expected service life? – With proper installation, H-type spring energized seals can withstand thousands of refueling cycles.

• Do they require maintenance? – Minimal; polymer and spring design ensures long-term reliability.

• Can custom sizes be produced? – Yes, Tesel Seal offers bespoke dimensions and spring loads for specialized nozzles.

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