• Diving on IWSS
    Wärtsilä Sternguard IWSS

    Fully in-water serviceable seal


Wärtsilä Sternguard IWSS seal

The Wärtsilä 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 pressure springs ensure a continuous pressure between the lapped surfaces and enables axial movement of the static section. A sealing device exists inside the static section, which prevents lubricant leakage during axial movement. This seal is available partially split for installations with shaft removals in dry dock, but also fully split for in-water overhauls or dry dock installations. 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.*

*when used with EALs

How can we help?

Contact our 24/7 customer support at sls247@wartsila.com for assistance with solutions related to the shaft line.

To enable prompt response, please indicate the Equipment Serial Number or the name of the vessel. Equipment Serial Number is taken from the equipment nameplate and includes all letters and numbers as given on the equipment nameplate.

For all other enquiries, please fill in the online form. Fields indicated with an asterisk (*) are required. We aim to respond within 1-2 business days depending on the scope of your enquiry.

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