A type of condition-based maintenance emphasizing the routine detection and correction of root cause conditions that would otherwise lead to failure. Such root causes as high lubricant contaminant, alignment and balance are among the most critical.


Related Terms

OVERTURNING

Failure of a retaining wall caused by the soil pressure overcoming the stability of the structure.

MARGIN OF SAFETY

A design criterion, usually the ratio between the load that would cause failure of a member or structure and the load that is imposed upon it in service.

LATCH-UP PHENOMENON

In a bipolar or MOS integrated circuit, the generation of photocurrents by ionizing radiation which can provide a trigger signal for a parasitic pnpn circuit and possibly result in permanent damage or operational failure if the circuit remains in this state.

HIGH-TEST CHAIN

Chain made from heattreatable plain-carbon steel, usually with a carbon content of 0.150.20; used for load binding, tie-downs, and other applications where failure would be costly.

CONTAMINANT FAILURE

Any loss of performance due to the presence of contamination. Two basic types of contamination failure are: Perceptible - gradual loss of efficiency or performance, and Catastrophic - dramatic, unexpected failure.

BURST PRESSURE RATING

The maximum specified inside-out differential pressure that can be applied to a filter element without outward structural or filter-medium failure.

CATASTROPHIC FAILURE

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

FLOW FATIGUE RATING

The ability of a filter element to resist a structural failure of the filter medium due to flexing caused by cyclic differential pressure.

FATIGUED

A structural failure of the filter medium due to flexing caused by cyclic differential pressure.

CAVITATION EROSION

A material-damaging process which occurs as a result of vaporous cavitation. 'Cavitation' refers to the occurrence or formation of gas- or vapor- filled pockets in flowing liquids due to the hydrodynamic generation of low pressure (below atmospheric pressure). This damage results from the hammering action when cavitation bubbles implode in the flow stream. Ultra- high pressures caused by the collapse of the vapor bubbles produce deformation, material failure and, finally, erosion of the surfaces.

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