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A machine breaks up solids.

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DEPOSITS

Oil-insoluble materials that result from oxidation and decomposition of lube oil and contamination from external sources and engine blow-by. These can settle out on machine or engine parts. Examples are sludge, varnish, lacquer and carbon.

EROSION

The progressive removal of a machine surface by cavitation or by particle impingement at high velocities.

CATASTROPHIC FAILURE

Sudden, unexpected failure of a machine resulting in considerable cost and downtime.

BREAKDOWN MAINTENANCE

Maintenance performed after a machine has failed to return it to an operating state.

FERROGRAPHY

An analytical method of assessing machine health by quantifying and examining ferrous wear particles suspended in the lubricant or hydraulic fluid.

DELAMINATION WEAR

A complex wear process where a machine surface is peeled away or otherwise removed by forces of another surface acting on it in a sliding motion.

PREVENTIVE MAINTENANCE

Maintenance performed according to a fixed schedule involving the routine repair and replacement of machine parts and components.

GENERATOR

A machine that changes that changes mechanical energy into electrical energy.

RAMP RATE

Ramp rate is used in bringing a turbine up to operating temperature and is the degrees Celsius rise per hour that metal surfaces are exposed to when bringing a machine to rated conditions. Manufacturers specify ramp rates or their machines in order to avoid thermal stresses. Thermocouples are used in measuring metal temperatures.

TURBINE

A machine that develops rotary power by directing a high-velocity fluid against blades mounted around the rim of a wheel. As a high-velocity fluid passes through a turbine, it pushes against the blades and causes the wheel to turn. The rotation of the wheel turns the axle, which drives the connected machinery.
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