Canadian Coast Guard opts for SeaThigor shaft seal retrofit

Malcolm Latarche

Malcolm Latarche · 16 April 2019


Thordon Bearings has received a Canadian Coast Guard contract to supply six award-winning SeaThigor shaft seals for retrofit installation to three purpose-built icebreakers. The 5,910grt CCGS Pierre Radisson along with sisterships CCGS Amundsen and CCGS Des Groseilliers, will each be retrofitted with two SeaThigor forward seals during scheduled drydockings over the next year.

The order follows the success of the 2017 installation and subsequent operation of SeaThigor seals aboard the oceanographic and hydrographic survey vessel CCGS Hudson, for which a procurement agreement was signed with the Government of Canada under its Build in Canada Innovation Program (BCIP).

Due to the success of that first SeaThigor installation, the government permitted the Canadian Coast Guard (CCG) to deal directly with Thordon Bearings without either party having to go through a competitive bid process, via the BCIP – Additional Sales.

The 98.2m long, 1200-class vessels are designed to Arctic Class 3 requirements and operate twin 674mm diameter shafts driving fixed pitch propellers. Propulsive power is generated by six Alco M251F main engines delivering 10142kW of power.

Scott Groves, Thordon Bearings’ Regional Manager – Americas, said, “This is a significant order for Thordon Bearings, marking not only the SeaThigor seal’s first-ever reference onboard a purpose-built icebreaker but also the largest propeller shaft seals we have ever manufactured. The vessels’ existing seals were leaking water into the machinery spaces, which meant they could not discharge oily-water overboard into Arctic waters. Ultimately, CCG needed a seal solution that was robust enough to withstand heavy-duty ice-breaking operations, without leaking. SeaThigor provides that level of robustness”.

The seals supplied to the Pierre Radisson-class of ships will also be the first SeaThigors designed with a split casing, as Carl Sykes, Manager of Thordon’s Global Service & Support division, explained.

“The limited space available in the vessels’ engine room prevented the installation of a SeaThigor seal with a conventional, fully encased bronze housing. So, we designed a seal with a split casing to simplify the installation and commissioning process, allowing engineers to access the underside of the seal. Many different departments – procurement, design, engineering and manufacturing – came together to really make this happen. It was a complete team effort.”

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