Comprehensive SRS authoring per IEC 61511 Clause 10
The Safety Requirement Specification (SRS) is the single source of truth for every SIF — capturing process safety time, action, demand mode, response time, fail-safe state, and proof-test requirements. We deliver SRS aligned to IEC 61511 Clause 10.
Establish SRS scope per IEC 61511 Phase 5 covering all SIFs from PHA / SIL allocation; build SIF inventory with SIL target, demand mode, process safety time, and operating context; reference PHA / LOPA worksheet IDs for traceability.
Author functional requirements per SIF — sensor measurement parameter, trip setpoint, voting logic, time-to-action, final-element action (close/open/trip), reset philosophy, override management; align with IEC 61511 Cl.10.3 mandatory requirements list.
Specify integrity requirements — SIL target, PFD/PFH allocation, response time, fault tolerance (HFT), SFF, diagnostic coverage, common-cause factor; align with IEC 61508 architectural constraints (Route 1H or 2H).
Specify environmental requirements — temperature, humidity, EMC, vibration, area classification (ATEX zone); interface requirements with BPCS, alarm system, F&G, ESD, asset management; cybersecurity requirements per IEC 62443.
Define operational requirements — bypass/override authorisation, manual reset, proof-test access; maintenance requirements — proof-test interval, procedure references, MTTR target; competency requirements for operators and technicians.
Conduct multi-discipline SRS review (process, instrumentation, operations, HSE, vendor) per IEC 61511 Cl.10.3; baseline SRS as Phase 5 deliverable; integrate with MOC for any subsequent change; align with FSA Stage 2 examination.
Complete Safety Requirement Specification (SRS) Development scope — every calculation, drawing, specification, and construction support activity.
Speak with our team to scope an engagement tailored to your facility, regulatory context, and lifecycle stage.