Most common errors in the SIS The aim of this article is to review some of the most common errors in the SIS (Safety Instrumented System) that can serve as a guide and reason for reflection for all those involved in its design, implementation and maintenance. Both IEC 61508 and IEC 61511 indicate the great …
Systematic Failures IEC 61511 defines systematic failures as those “related to a “pre-existing” fault, which can only be eliminated by removing the fault by a modification of the design, manufacturing process, operating procedures, documentation or other relevant factors”. The peculiarity of systematic failures is that they are “hidden” and may never manifest or be detected, …
SIS Life Cycle – IEC 61511 The image shows the main phases of the SIS Life Cycle (Life Cycle of Safety Instrumented System), as well as the technical disciplines that lead each part. Analysis Phase In this phase, a rigorous analysis of the hazards of the process is carried out, comparing the probability that a …
Compliance with IEC 61511 What do we have to do to be compliance with IEC 61511? This Standard introduces the concept of Safety Life Cycle and, therefore, the answer is associated with the fulfillment of each phase of this cycle. Our intention is to explain it, in a simple way, for the not so expert. …
