Is the risk worth it? Beware of the new safety instrumented suppliers.

The new ANSI/ISA S84 .01 and international standard IEC-61508 have placed great emphasis on safety instrumented systems (SIS) for process industries. These new standards set requirements for performance (safety integrity level, or SIL), design, and maintenance. Furthermore, in the United States, these requirements are not optional and will be enforced by OSHA‑PSM and EPA‑RMP as good engineering practices.