Process Safety Engineering

Alarm Rationalisation Campaign

One-time engineering campaign — extract, rationalise, and reissue an EEMUA 191-compliant Alarm Master List

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Technical overview

Alarm Rationalisation
Campaign

An alarm rationalisation campaign is the structured engineering project that takes a legacy DCS — typically carrying 3–5× more alarms than EEMUA 191 targets allow — and produces a defensible, philosophy-aligned Alarm Master List that meets ISA-18.2 rationalisation criteria. The work is bounded and intensive: weeks of multidisciplinary workshops, historian-driven bad-actor analysis, suppression-logic design, and a final DCS implementation specification. It is distinct from ongoing alarm management programme governance (which is a separate, sustaining lifecycle service) — this campaign is the front-loaded engineering deliverable that establishes the baseline. The execution failures we encounter are predictable: skipping the alarm philosophy step, rationalising tags without operator engagement, missing suppression design for startup / shutdown modes, and finishing without a baseline KPI dashboard to prove EEMUA 191 compliance at handover.

Alarm Rationalisation Campaign — Overview
Engineering process

Alarm Rationalisation Campaign workflow

Alarm Philosophy Development

Author or update alarm philosophy per ISA-18.2; define rationalisation criteria, priority bands (critical / high / medium / low), acceptable response times, and alarm presentation.

Database Extraction & AML Creation

Extract DCS alarm database; de-duplicate, map to P&ID tags, and filter safety-critical alarms; build preliminary alarm master list (AML) with tag, setpoint, and current priority.

Rationalisation Workshops

Review each alarm against philosophy in multi-discipline workshop; assign priority, consequence, safe-state response, response time, and suppression requirement per tag.

Nuisance Alarm Elimination

Extract historian data to identify standing, chattering, and frequently-activated alarms; rationalise bad actors per ISA-18.2 criteria; delete or redesign transient alarms.

Suppression Logic & ORP Design

Design state-based and conditional suppression logic to eliminate alarm flood under abnormal conditions; author operator response procedures (ORPs) for all critical alarms.

KPI Baseline & Implementation Support

Benchmark current alarm rates against EEMUA 191 targets (<1 alarm/10 min average); support DCS implementation; monitor post-rationalisation performance metrics.

Alarm Rationalisation Campaign — Scope
Scope of work

Every deliverable — from basis to handover

Complete Alarm Rationalisation Campaign scope — every calculation, drawing, specification, and construction support activity.

Alarm philosophy document development per ISA-18.2 — rationalization criteria, priority bands, response time targets
DCS alarm database extraction, de-duplication, and P&ID tag mapping to build preliminary Alarm Master List (AML)
Systematic rationalization workshops: priority, consequence, safe-state response, setpoint, and suppression per tag
Bad-actor and nuisance alarm identification from historian data — chattering, standing, and frequently-activated alarms
State-based and conditional suppression logic design for startup, shutdown, and process-mode transitions
Operator Response Procedure (ORP) authoring for all critical alarms with response time and safe-state action
KPI baseline measurement and EEMUA 191 target tracking — alarm rates, standing alarms, chattering alarms, flood events
DCS implementation specification and post-rationalisation performance monitoring support
Engineering outcomes

Outcomes of Alarm Rationalisation Campaign

Alarm Flood & Nuisance Alarm Reduction
  • Operators respond to genuine abnormal situations not nuisance alarms
  • Critical alarms are prioritised and acted on within response time
  • Flood alarm conditions eliminated — protects operators in emergencies
  • Documents alarm basis as evidence for OSHA PSM inspections
EEMUA 191 / ISA 18.2 Alarm Defence
  • EEMUA 191 and ISA-18.2 alarm management lifecycle compliance
  • OSHA PSM process safety information documentation
  • COMAH/SEVESO control room alarm system adequacy
  • Post-incident regulatory recommendation implementation
Operator Situation Awareness Quality
  • Alarm rate reduction to EEMUA 191 targets: <1 alarm/10 min average
  • Reduced control room workload and operator stress
  • Standing alarm elimination improves system visibility
  • Prioritised alarms reduce time to abnormal situation response
Alarm Rationalisation & DCS Programme ROI
  • Reduces unplanned shutdowns caused by missed or delayed alarm response
  • Prevents process excursions from alarm overload
  • Lower maintenance burden: rationalised alarms only in DCS
  • Avoids costs of post-incident investigation attributable to alarm management
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