Process Safety Engineering

Loss Prevention Engineering

Loss-expectancy-driven prevention engineering — FM Global / Marsh / Lloyd's underwriter-grade design

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Technical overview

Loss Prevention
Engineering

Loss Prevention Engineering (LPE) is the discipline of designing high-hazard facilities to minimise probable maximum loss (PML), maximum foreseeable loss (MFL), and business-interruption exposure — the language of underwriters and CFO risk committees rather than only HSE managers. The field operates at the intersection of process safety (CCPS RBPS, OSHA PSM), fire-and-explosion engineering (FERA outputs, FM Global Data Sheets, NFPA standards), and insurance industry frameworks (Highly Protected Risk qualification, Marsh PML methodology, Lloyd's London property markets). Mature LPE practice treats every Tier 1 PSE as a financial event with quantifiable impact ($100M–$1B+ for refinery / petrochemical Tier 1 fires), drives protection capex against marginal-loss-reduction logic, and produces insurer-dialogue evidence that can move premium tiers (typical 30–50% reduction between IRMI HPR-qualified and unprotected sites). The 2020s have added climate-physical-risk exposure (extreme weather, flood, wildfire), cyber-physical risk, and supply-chain business-interruption to traditional fire / explosion / mechanical breakdown scope.

Loss Prevention Engineering — Overview
Engineering process

Loss Prevention Engineering workflow

Loss Prevention Scope & Inventory Review

Establish loss prevention scope per CCPS RBPS and OSHA PSM Engineering element; build loss inventory by unit (asset value, business interruption exposure, environmental sensitivity); align with insurer (FM Global, AXA XL, Lloyd's) data requirements.

Inherent Safety & Layer Hierarchy Review

Apply CCPS Inherently Safer Design hierarchy — minimise, substitute, moderate, simplify; review engineering controls (BPCS, alarms, relief, SIS, passive); identify high-leverage prevention opportunities at FEED stage where cost-multiplier is 10–100× lower.

Engineered Loss Prevention Design

Specify engineered loss prevention measures — secondary containment per SPCC, blast walls per API 752, fire-suppression per NFPA, gas/fire detection per ISA TR84.00.07; integrate with FERA-output and facility siting study findings.

MOC & Engineering Change Discipline

Design MOC (Management of Change) programme per OSHA PSM (1) covering process, equipment, organisational, and procedural changes; specify PSSR (Pre-Startup Safety Review) gate criteria; integrate with PHA revalidation triggers.

Insurer & Underwriter Engagement

Develop FM Global HPR-tier qualification dossier with site walk-down photos, equipment registers, and protection documentation; engage AXA / Lloyd's underwriters with engineered-loss-prevention narrative; capture premium-tier savings opportunities.

Loss Prevention Programme Governance

Issue loss prevention programme charter with KPIs (loss incident rate, MOC closure cycle, near-miss reporting); specify annual audit programme and management review cadence; integrate with API RP 754 PSE indicators.

Loss Prevention Engineering — Scope
Scope of work

Every deliverable — from basis to handover

Complete Loss Prevention Engineering scope — every calculation, drawing, specification, and construction support activity.

Probable Maximum Loss (PML), Maximum Foreseeable Loss (MFL), Estimated Maximum Loss (EML) calculation
Business-interruption exposure quantification — direct, contingent, supply-chain
FERA-driven hierarchy of protection — prevention > control > mitigation
FM Global Data Sheet alignment for HPR qualification
Passive protection scope (PFP, spacing, blast-resistant) per FERA thermal-load and overpressure
Active suppression integrated with detection per NFPA 13 / 15 / 16 / 750
Procedural barrier strengthening — MOC, PTW, contractor management
Climate physical-risk overlay — extreme weather, flood, wildfire, sea-level rise
Cyber-physical risk per IEC 62443 with insurance treatment
Underwriter dialogue with quantitative evidence — PML reduction, HPR-tier qualification
Engineering outcomes

Outcomes of Loss Prevention Engineering

Loss Event Prevention & Inventory Control
  • Limits credible fire / explosion / toxic-release loss envelope
  • Drives capex to genuine highest-impact protection
  • Integrates passive and active layers into coherent defence-in-depth
  • Anchors operational discipline through procedural barrier strength
API 14C / OSHA PSM Engineering Defence
  • FM Global Data Sheet HPR-aligned design
  • NFPA / API RP 752-754 audit-defensible
  • Withstands OSHA NEP / EPA RMP inspection
  • Aligns with COMAH / Seveso ALARP demonstration
MOC & Engineering Change Discipline
  • Reduces business-interruption exposure across direct / contingent / supply chain
  • Drives ITM (NFPA 25) discipline through risk-prioritisation
  • Strengthens cross-function dialogue — Operations / Engineering / Insurance / Finance
  • Anchors realistic emergency-response drill scenarios
Capital, BI & Insurance Loss Reduction
  • Captures HPR insurance-tier premium reduction — typical 30–50% vs unprotected
  • Reduces underwriter loadings through quantified loss-expectancy evidence
  • Optimises capex sequencing against marginal-loss-reduction
  • Pre-empts post-loss recovery and litigation cost
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