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The rings within dry gas seals are made up of graphite, tungsten carbide, or another substance with low friction properties. Conversely, wet gas seals use a liquid film to help prevent leakage, typically delivered by a pressurized system that helps keep the space between the two sealing surfaces lubricated.

Dry seals offer an alternative for dusty or extremely viscous applications that guarantees complete sealing, minimum maintenance, protection of the other system components such as the wear of the shaft and less energy consumption due to motor friction.

Separation seals prevent oil from entering the dry gas seal and ensure that no process gas enters the bearing cavity. They are also useful as a last resource to prevent process gas from entering the bearing cavity in the event of a catastrophic seal failure.

The dry gas seal performs the principal sealing function, while the carbon ring seal protects the dry gas seal against bearing oil contamination and guards against compressor gas contamination of the bearing brackets.

Dry seals don't need oil circulation pumps. Energy usage is about 5 kW per hour. Design simplicity leads to improved reliability, reduced unplanned downtime, and lower maintenance costs.

With a dry seal the vapors have a better chance of escaping. Typically wet seals have a better life expectancy. A major disadvantage when using wet seals is the potential for barrier fluid to enter the process and possibly contaminate the batch.

Wet seal systems rely on the typical backer rod and sealant assembly at panel joints to create a barrier-type system. Dry seal Systems are also barrier-type, but fully-engineered with pre-formed gaskets and extruded receivers. Rainscreen systems have open joints between panels, with the drainage plane behind.