Wartsila introduces Maneguard seals
Wartsila Corporation has introduced a new family of face-type seals specifically for water-lubricated stern tubes. These new Deep Sea Seals brand ManeGuard seals are ideally suited to vessels sailing frequently in coastal or other waters with high sand and silt contents. Even under such aggressive conditions, they provide robust seals with high reliability and long service intervals.
ManeGuard face-type seals are produced for shafts of 70 to 240 mm (3 to 9 inch) diameter, and are either partially split (PS type) or fully split (FS type). They are able to accept high shaft speeds up to 2,700 rev/min.
With ManeGuard seals, says Wartsila, worn shafts or liners, leaking gland plates and continuous maintenance with their associated costs can be left in the past. The simplicity of the design is claimed to provide maximum sealing capability for all types of water-lubricated bearings. For stern tubes with closed water systems, ManeGuard seals can be used both inboard and outboard.
The seals incorporate interface materials with a high abrasion resistance which, together with a design to minimise galvanic corrosion, dramatically reduce maintenance costs. They thus feature low through-life costs. With their statically-mounted elastomeric body, the seals accept misalignment in all planes and compensate for vibration which can be inherent in vessels involved in coastal trade such as ferries, general cargo vessels, fishery craft, workboats and river craft.
The seals also have various safety features. For example, they automatically compensate for bearing wear. They also have a low magnetic signature. An inflatable emergency seal is fitted as standard. All seals are factory tested before shipping.
The ManeGuard seals are compact in length and are suited both for retrofit of existing sealing systems or packed glands, and for new construction. Their installation can be easy and quick. In the case of retrofits, the fully-split versions allow the ManeGuard seals to be fitted with the shaft still in place.