Shaft Seal · Shaft Line Equipment
The Wärtsilä Airguard 150 mm is an air‑filled shaft seal designed for shafts up to 150 mm diameter, providing a friction‑free barrier that prevents water ingress without the need for oil lubrication. As a Shaft Seal, it is normally installed at the inboard or outboard end of the stern tube around the propulsion shaft where the shaft passes between the hull and surrounding water or lubricating-oil system. In that role, its primary purpose is to control seawater ingress and lubricating-oil leakage while allowing the shaft to rotate. Lip, face and other stern-tube seal designs use different sealing elements, but all depend on smooth shaft or liner surfaces, correct lubrication and undamaged sealing rings. For exact ratings, dimensions, settings, capacities, materials and variant-specific limits, refer to the manufacturer documentation for the exact figure.
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What our service work and the manufacturer documentation say about keeping this model running.
Inspect leakage, seal-oil or header-tank behaviour, shaft-liner condition where accessible, piping, vents and pressure-balancing arrangements. Check for signs of seawater contamination in stern-tube oil and for external oil loss. Review leakage trends rather than relying only on a single observation. Refer to the manufacturer documentation for the exact figure for pressure balance, liner wear and seal replacement criteria.
Carry complete seal-ring or lip sets, O-rings, gaskets, approved seal lubricants and liner-repair or emergency sealing provisions where specified by the vessel support plan.
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