(November 23, 2010)
Manufacturer of control and instrumentation for marine rotating machinery AMOT receives the first bearing wear monitoring system type approval according to Germanischer Lloyd's (GL) "Guidelines for Machinery Condition Monitoring". AMOT's condition monitoring system provides online supervision of crank-train bearings of low-speed diesel engines onboard vessels enabling to detect bearing wear at an early stage. A comprehensive onboard field test demonstrated GL the reliability of the condition monitoring information provided by the system. The field tests have been conducted in close cooperation with Hapag-Lloyd and MAN Diesel & Turbo.
A significant benefit for shipping companies is the prevention of unnecessary open-up inspections and surveys of crank-train bearings. The dismantling and re-assembling of bearings bear a risk of damage. "Condition monitoring reduces the overall costs of inspection services and optimises maintenance schedules, reducing the risk of equipment failures or damages," says Dr Jörg Rebel from GL's Strategic Research department.
Bearing wear monitoring systems are based on a simple measurement principle: By the use of two proximity sensors the position of each crosshead assembly is measured at bottom dead centre during each crankshaft revolution. This means, the overall clearance of all involved crank-train bearings, i.e. the crosshead bearing, the crank-pin bearing and the two adjacent main bearings, are continuously monitored.
The type approval certificate is the basis for a survey arrangement for machinery components based on condition monitoring. A condition monitoring system uses various operation parameters or diagnostic results to gain information about the current condition of the monitored equipment. The GL requirements for the survey arrangement and the type approval process for the condition monitoring systems are available in the "Guidelines for Machinery Condition Monitoring", Edition 2008.
GL has been involved in the field tests for bearing wear monitoring systems onboard ships in order to verify the reliability of bearing wear monitoring data for the last decade. MAN Diesel & Turbo developed their own specifications for bearing wear monitoring systems with the support of GL.
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