INTEGRATING RISK BASED MECHANICAL INTEGRITY AND ISA S84.01

摘要

Risk Based Mechanical Integrity (RBMI) is a methodology to maintain the integrity and reliability of equipment while simultaneously achieving an acceptable level of business risk. Historically known for its value in managing fixed equipment, RBMI has recently been extended to include instrumentation. RBMI for instrumentation is performed by carrying out a modified risk assessment for an instrument loop. The probability of failure is based on the design and service environment for the loop. The consequences are found by linking the instrument loop to a fixed equipment item. The RBMI process thereby satisfies the requirements of ISA S84.01. This paper presents an overview of the methods used to perform an RBMI analysis for instrumentation that also satisfy the requirements of ISA S84.01. This paper will demonstrate that, while carrying out an RBMI study for instrumentation, one can easily extend the study to a qualified SIS analysis.