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  Miscellaneous Quality Topics
  Availability and Reliability

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Author Topic:   Availability and Reliability
Marc Smith
Cheech Wizard

Posts: 4119
From:West Chester, OH, USA
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posted 27 July 1998 01:58 AM     Click Here to See the Profile for Marc Smith   Click Here to Email Marc Smith     Edit/Delete Message   Reply w/Quote
Some definitions used in industry for availability and reliability:

Availability is the percent of time the unit is available to produce in any given time period.

%Availability = ((hours in period) - (forced outage and scheduled maintenance))/(hours in period) X 100

Reliability is the percent of time the unit is not down due to forced outages, unplanned, or unscheduled maintenance, in any given period of time.

% Reliability = ((hours in period) - (forced outage))/(hours in period) X 100

Use factor is the percent of time the unit operates in any given period of time.

% Use factor = (unit operating hours)/(hours in period) X 100

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