
There are only two ways to get high system reliability: meeting outstanding task quality performance standards so excellence is done everywhere, and by building parallel arrangements where the failure of one has no impact on system performance. Both are done in a PWW EAM System-of-Reliability
Equipment can be configured in series or in parallel arrangements. A series arrangement is when one item or task connects sequentially to the next. It takes only one item to fail in a series arrangement and the whole system will fail. Exceptionally reliable individual equipment is needed to experience a high-reliability system with a series arrangement.
Parallel arrangements are when each item is arranged as a companion, one duplicates another. In this circumstance, exceptionally reliable systems can be formed even if individual equipment has poor reliability.
A system is formed when equipment is combined to do a duty. For example, when a pump, coupling, and electric motor are connected they form a series system used to move liquid through pipes from one point to another.
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