SIS and the Bathtub Curve

“When I was young, I would sit in the bath and ideas would come to me. But I’m not young anymore, so now I just sit in the bath.”  — Aki Kaurismaki “We’re installing a safety instrumented system in our existing process. Do we have to pull out all the existing instruments and replace them [...]

By |2021-07-01T14:57:47+00:00July 1st, 2021|Process Safety, Process Safety Management|0 Comments

Yes, But…Hardware Fault Tolerance

“Therefore, by virtue of the authority vested in me by the Universita Committeeatum E Pluribus Unum, I hereby confer upon you the honorary degree of Th.D.,… er, ‘Doctor of Thinkology’.”  —The Wizard of Oz Most of our readers understand that for a Safety Instrumented Function—a SIF—to have a particular Safety Integrity Level—a SIL—its Average Probability [...]

SIL Certification: Necessary or Sufficient?

“Contrary to what many parents tell their children, talent and hard work are neither necessary nor sufficient for economic success.”  —Robert H. Frank We are all guilty of telling tales we know to be untrue in order to encourage virtuous behavior. Parents tell their children to be good so Santa Clause will come. OSHA tells [...]

By |2019-05-23T16:10:03+00:00May 23rd, 2019|Process Safety|1 Comment
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