When discussing water lubricated propeller bearings with other engineers or designers, we often talk about establishing â€œliftâ€ in the bearing, or the importance of keeping shaft rpm above a certain â€œthreshold speedâ€. What we are really talking about is the creation of a very thin film of water between the shaft and the bearing surface which allows the bearing to carry the load with low friction and minimal wear.
Recently, we have had some ship owners/managers raise the concern that the price the newbuild shipyard was charging to install a COMPAC seawater lubricated stern tube bearing system was higher than the oil lubricated white metal bearing system
I just returned from a recent visit to New Zealand and Hamilton Water Jet - the designer of the world's first water jet propulsion system. Just to give this perspective, when Hamjet first developed the pump-like system for propelling small water craft, they ran a shake-down cruise on the Ganges back in the 1950's. Sir Edmund Hillary was at the controls of one of the boats.
Some customers have asked us about the shelf life of a Thordon bearing. Thordon bearings have proven to be stable without any degradation over long periods of time if stored in a reasonable manner. The bearings should not be stored near a direct heat source, not be exposed to chemicals and not be in direct sunlight.
After just having spent a week at the SMM (Shipbuilding Machinery and Marine Technology) trade fair in Hamburg, Germany, it would hardly seem like a slowdown in the global marine market. With over 2000 exhibitors from 58 countries and 50,000 visitors, all 11 Halls at Hamburg Messe Congress Centre were completely full.
In June at the AMOP Technical Seminar on Environmental Contamination and Response in Halifax, Nova Scotia, Canada, DR. Dagmar Etkin of Environmental Research Consulting (New York, USA) presented a paper on oil discharges from ships in ports in the USA.
Clean Power Generation
Pumps and Industrial