Sternguard Seals

Stern Tube Seals for Water and Oil Lubrication

KPS supplies Sternguard Seals from Wärtsilä, a global leader in smart technologies and complete lifecycle solutions for the marine and energy markets. By emphasising sustainable innovation, total efficiency and data analytics, Wärtsilä maximises the environmental and economic performance of the vessels and power plants of its customers.

Wartsila Sternguard Products | In-Water Serviceable Seal

Sternguard IWSS

The Wartsila Sternguard In-Water Serviceable Seal (IWSS) is a fully underwater serviceable seal. This provides segments including commercial, cruise & ferry, merchant and in-land waterway vessels with opportunities to reduce down-time as there is no requirements for dry-docking, habitat usage and shaft withdrawal. 

This reduces costs as there is no requirement to drain the stern tube oil or aid and transfer vessels to a dry dock slot. In addition, there is no need to unload cargo for an underwater overhaul.

The Sternguard IWSS has been designed to provide a reliable and faster service as well as improved operational performance. Environmentally Acceptable Lubricants (EALs) and mineral oil lubricant are accepted and the seal is compliant with the 2013 US EPA Vessel General Permit rules.*

To enhance serviceability, the seal is equipped with an inflatable seal which eliminates the need for draining the whole stern tube during overhaul. In addition, the inflatable seal minimises the possibility of leakage of lubricant to the environment during in water service.

Wartsila Sternguard Seals - fully underwater serviceable seal
Wartsila Sternguard Seals - IWSS image

Sternguard In-water serviceable seal qualities


High performance







Water Lubricated Seals

Wärtsilä provides superior quality products that offer true value for the whole life of the vessel.

Water lubricated seals prevent expensive emergency dockings and downtime, avoiding leakages and the associated costs. Our water lubricated seals are fully compliant with environmental legislations, including the Vessel General Permit (VGP) so you can sail with confidence. Wärtsilä is the Original Equipment Manufacturer for every major component included within our packages and products, which ensures the perfect harmony of our solutions.

Additionally, our global stock and service engineer network means we can support you and your vessel anywhere in the world.

The Wärtsilä Enviroguard and Iceguard ranges have long been the standard for military and commercial applications, and for sensitive, harsh environments. The range offers environmentally friendly, low maintenance, high performance face type seals, which have an extensive fitted history spanning many years and numerous different vessel types. These seals can accommodate large and repeated axial and radial shaft movements, as well as vibrations.

Wartsila - water lubricated seals

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