Oil lubricated carosel
Wärtsilä Airguard seal
An anti-pollution and environmentally compliant solution

Wärtsilä Airguard Seal

The Wärtsilä Airguard is an anti-pollution lip type seal, which is especially designed for applications where extra security against the leakage of oil into the seawater is required.

The Wartsila Airguard completely separates the stern tube oil and the seawater by an air barrier. Any seawater and/or oil entering the air barrier chamber is automatically drained inboard without leaking outboard or entering the stern tube.

As the seal successfully takes away the oil-to-sea interface, it can be operated with mineral oil in accordance with the 2013 Vessel General Permit.

Anti-pollution sealing at its best

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The Wärtsilä Airguard seal works with compressed air, which is applied to the void space between the seal rings. This constant flow of compressed air into the void space is automatically set higher than the seawater pressure, resulting in a small amount of air forced out into the seawater.

The void space is connected to an inboard drain collection system. Any seawater or oil that infiltrates the void space is automatically drained inboard, preventing oil leaking outboard or seawater entering the stern tube. As the Wärtsilä Airguard seal successfully takes away the oil-to-sea interface, it can be operated with mineral oil in accordance with the 2013 Vessel General Permit.

Continuously pressure balanced

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The aft stern tube seal is a multi-barrier lip type seal which contains four seal rings running on a seal liner, to
prevent grooving of the shaft. The two seal rings face the stern tube towards the oil, providing an active double security against oil spills. The other two seal rings face towards the seawater to effectively seal against seawater and sediments.

The pressurised air in the central void space is dynamically controlled and monitored, based on the variations of the seawater pressure, which keeps the Wärtsilä Airguard system continuously pressure balanced.

This results in less pressure and load on the four seal rings, and minimal wear on the liner. As an additional
safety feature, a specially designed P-ring protects the seal ring from being damaged by fishing nets and lines.

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