The average failure time of a dry-running impeller is around two and a half minutes, so frequently an impeller is destroyed before an alarm goes off. |
The UK’s Yanmar importers, have carried out tests on the bearings used in Speedseal Life and achieved 10 consecutive tests of 10-minutes dry-running without failure. |
Normally the impeller rubs against a static brass cover plate with sea water as lubricant, hence a rapid failure when running dry. The illustration shows the Award Winning Extra Slip Bearing used by Speedseal Life with a PTFE disc placed between the end of the cover recess and the rotating brass disc which is in contact with the impeller. |
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Tests show a 300% increase in normal impeller life, as well as the excellent run-dry ability to increase safety.
See Test Results.
When the bearing discs become worn, they are simply replaced at low cost.
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