SIL Validation is carried out to establish a “fit for purpose“ design of instrumented safety measures that are capable of mitigating hazards with respect to safety, environmental consequences, and economic loss, and are able to achieve requirements as stated in the safety-requirement specification (SRS).
SIL Validation is carried out with the intent to allocate safety functions to protection layers, determine the associated safety integrity level for each safety instrumented function, and allocate safety functions to protection layers. It is carried out prior to the operation phase of the IEC 61511 safety lifecycle to put forth a plan for routine actions such as proof testing, maintenance override conditions, documentation of system demand and failure rates consistent with the Safety Integrity Level (SIL), verification calculations, audit and test documentation, and diagnostic and repair procedures.