Process design engineers work hard to create inherently safe processes. To a great extent, this effort is successful and the general industry safety record continues to get better. Cons..
Process design engineers work hard to create
inherently safe processes. To a great extent, this effort is
successful and the general industry safety record continues
to get better. Consequently, potentially dangerous conditions
(hazards) are infrequent. This situation makes safety
instrumented system (SIS) design and maintenance the hard job
that it is. An SIS may sit without a hazardous demand for
years. If the SIS never takes action, how do we know it
works?
The answer of course is that we must test the SIS.
This testing has been the topic of some interesting
discussion recently. Two issues have surfaced to challenge
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