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SPIRAL-GROOVE DRY GAS SEALS

Dry gas seals

50 years of industry firsts - our spiral-groove dry gas seals are an industry standard.

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OVERVIEW

Setting the standard in dry gas seal technology

The dry gas seal journey started in the early 1970s, when approximately 80% of compressor failures were due to seal oil system faults. So, when customers demanded oil-free compressor sealing, we listened, pioneering the development of the non-contacting spiral groove design for dry gas seals.

Spiral groove technology makes all the difference to dry gas seals and is the foundation of John Crane’s innovation. It has established our position as a global leader in sealing solutions since its development in 1970 and the first compressor installation in 1976.

Today, our spiral groove dry gas seals are the industry standard for compressors onshore and offshore, across oil and gas, power generation and new energy industries.

WHY JOHN CRANE?

Why use John Crane’s dry gas seals

Engineered for demanding environments, the spiral groove, contactless technology of our dry gas seals helps protect critical equipment, reduce maintenance demands and support long-term uptime.

50

Years of dry gas sealing innovations.

2000 +

Dry gas mechanical seals supplied for LNG applications around the globe.

0.004

Depth of barrier gas film (in mm) within our logarithmic spiral groove design.

TECHNOLOGY

Non-contacting spiral groove technology: game-changing engineering

In 1970, John Crane was awarded a patent for the first spiral-groove dry gas seal.

Now, with over 50 years of proven success, our dry gas seals remain the preferred choice for customers worldwide across critical industrial applications, supporting reliable, efficient and sustainable operations.

How it works

John Crane’s logarithmic spiral groove design is optimised with a groove angle to generate maximum lift, enabling non-contacting operation, reducing friction, limiting wear and protecting critical equipment. The barrier gas is a super-thin film, as small as 4µm (0.004 mm) - just a fraction of a human hair.

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NEW ENERGY

Enabling the energy transition

Our dry gas seals support the reliability and sustainability goals of our customers across traditional energy and process industries.

They are also designed and engineered for new energy applications, including hydrogen, carbon capture, utilisation and storage (CCUS), sustainable fuels, energy storage, and more.

Read our case studies to learn more about real-world applications

Maintenance and repair

John Crane Performance Plus is our modular service framework designed to optimise the performance of your plant’s rotating equipment and other critical assets. It delivers world-class maintenance and repair services, as well as dry gas seal refurbishment services. Wherever you are in your plant’s lifecycle, John Crane Performance Plus provides tailored service solutions to meet your specific needs.

More about John Crane Performance Plus™
FREQUENTLY ASKED QUESTIONS

Common questions

What is a dry gas seal?

A dry gas seal is a non-contacting mechanical seal designed to prevent gas leakage in compressors. It replaces oil-lubricated seals, providing higher reliability, lower maintenance, and improved energy efficiency. Used in centrifugal and other compressors, dry gas seals for centrifugal compressors are critical for demanding industrial applications, including oil and gas, power generation, and hydrogen or CCUS systems.

How does a dry gas seal work?

A dry gas seal works by creating a non-contacting barrier between the rotating shaft and the stationary compressor housing. Using spiral groove or other face technology, it prevents gas leakage while reducing friction. This ensures reliable compressor operation, minimal wear on dry gas seal components, and long-lasting performance in centrifugal compressors and other rotating equipment.

Are dry gas seals environmentally friendly?

Dry gas seals prevent leakage of harmful gases, reduce friction, and eliminate the need for oil lubrication. By minimising emissions, lowering energy consumption, and supporting cleaner operations, dry gas seal systems for centrifugal compressors are an environmentally responsible solution for industries including LNG, hydrogen, and CCUS applications.

What is dry gas seal in compressor?

A dry gas seal in a compressor is installed between the bearing and compression stages to prevent process gas from leaking. Supplied with filtered product gas at pressures above suction, these compressor dry gas seal systems ensure safe, reliable, and efficient operation while reducing emissions and maintenance in high-speed centrifugal compressors.

How to fit a dry gas seal?

To fit a dry gas seal, ensure the compressor shaft and housing are clean and undamaged. Carefully install the dry gas seal components following the manufacturer’s specifications, align the seal faces, and verify gas supply pressures. Proper installation ensures optimal performance, reliability, and long service life in compressor dry gas seal systems.

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