Quantitative Risk Assessment (QRA)

We conduct QRAs to identify and quantify risks associated with flammable, toxic, and high-pressure chemical release scenarios. Our studies calculate Individual Risk (IRPA contours) and Societal Risk (F-N curves) to assess compliance against national and international regulatory standards.

• Leak frequency calculations based on international databases (e.g. OGP, PCRA)
• Individual risk contours mapping (1E-05, 1E-06 contours)
• ALARP (As Low As Reasonably Practicable) evaluations and risk mitigation recommendations

Why Operators Require QRA

A QRA is required for environmental clearances, hazard contour planning, and local safety board approvals. It proves that the layout of a processing unit, tank farm, or pipeline maintains acceptable safety distances to neighboring properties and public infrastructures.

Structured Hazard Identification Workshops

A successful HAZOP depends on rigorous workshop facilitation. Our experienced chairs guide process engineers, operators, and controls specialists node-by-node, verifying safety logic, relief systems, and operating envelopes.

HAZOP & HAZID Study Workshops

We facilitate structured, multi-disciplinary Hazard and Operability (HAZOP) and Hazard Identification (HAZID) workshops. Using systematic process parameter guide words, we review P&IDs to identify system design flaws and operational errors.

• Detailed P&ID node preparation and guide-word deviations checklist
• Consequence, cause, and safeguard mapping for each deviation
• Clear, actionable recommendations tracking to close safety loops

SIL Selection & Verification (LOPA)

We provide functional safety consulting aligned with IEC 61508 / IEC 61511. We guide teams through LOPA (Layer of Protection Analysis) to determine required Safety Integrity Levels (SIL 1-3) and calculate loop PFDavg to verify loop hardware reliability.

• LOPA workshops to select required safety function performance
• Probability of Failure on Demand (PFDavg) loop modeling
• Hardware Fault Tolerance (HFT) and safe failure fraction verification

Functional Safety Compliance

As safety instrumented loops become more complex, verifying their reliability is essential. We check loop architectural constraints, sensor configurations, logic solver specifications, and shutdown valve performance parameters to ensure compliance.

Advanced Simulation Tools

Using leading process engineering software (such as PHAST consequence modeling), we calculate leak rates, thermodynamic flashes, dispersion envelopes, thermal radiation (pool/jet fire contours), and vapor cloud explosion (VCE) blast footprints.

Consequence Modeling & Gas Dispersion

We simulate chemical and hydrocarbon release scenarios to map out hazard contours. Our calculations analyze dispersion envelopes, thermal radiation fields, and explosion overpressures to verify safe blast walls and plant layout limits.

• Flammable and toxic gas dispersion footprints
• Thermal radiation modeling for pool fires and jet fires
• Overpressure explosion calculations (Vapor Cloud Explosions)

🖥️ PHAST (DNV)

Used for consequence modeling of gas releases, pool/jet fires, and vapor cloud explosions. Generates precise geographical hazard footprints.

🔧 exida exSILentia / Custom PFD Tool

Used to verify Safety Integrity Level (SIL) loop parameters. Calculates Probability of Failure on Demand (PFDavg) against targets.

🧮 Proprietary Hazard Seeding

Custom-developed LOPA worksheets, hazard registers, and frequency databases aligning with local regulatory requirements.