A Safety Instrumented Function can be correctly specified, designed and verified at project completion and still lose much of its intended risk reduction during operation if proof tests are missed, bypasses are poorly controlled or dangerous failures remain hidden. Functional…
A Functional Safety Assessment is an independent review of whether functional safety activities have been planned, performed and evidenced appropriately for a project or operating facility. It is not simply a design calculation review and it is not the same…
A Safety Requirements Specification is the key document that translates hazard and risk decisions into requirements for Safety Instrumented Functions. Without a clear SRS, a project can have a correct SIL assessment but still deliver a SIF that trips at…
SIL classification determines how much risk reduction a Safety Instrumented Function needs. SIL verification answers the next question: can the proposed SIF design actually achieve that integrity over its intended operating and test interval? For low-demand process safety functions, verification…