ISA-TR84.00.03:2012

Lifecycle phases 5 and 6 involve the installation and testing of the SIS, the validation that the SIS meets the safety requirements specification, and the assurance that functional safety is maintained during long term operation and maintenance. An important aspect of achieving and maintaining the SIS integrity and its specified SIL is the implementation of an MI program that provides quality assurance of the installed SIS performance. This technical report is an informative document providing guidance on establishing an effective MI program that demonstrates through traceable and auditable documentation that the SIS and its equipment are maintained in the “as good as new” condition. The technical report addresses the identification of personnel roles and responsibilities when establishing an MI plan, important considerations in establishing an effective MI program, and detailed examples to illustrate user work processes used to support various activities of the MI program. Data and information collected as part of the MI program can be used to validate the SIL Verification calculations as discussed in ISA-TR84.00.02 and the selection and continued use of devices as discussed in ISA-TR84.00.04 Annex L.