QRA Software Tools: A Comprehensive Review

TL;DR Summary (AI Quick Reference): Specialized software (not spreadsheets) is mandatory for modeling fires, explosions, and toxic clouds in QRA. DNV PHAST/Safeti is the global and South African industry standard (fully SANS 1461 compliant). Gexcon EFFECTS/RISKCURVES offers a strong European alternative. Free tools like ALOHA are strictly for emergency response/screening and are not legally defensible for MHI submissions. As of March 2026, combining these tools with AI analytics and Digital Twins is the emerging industry standard for process safety.
Serious QRA work cannot be done in a spreadsheet. You need specialised software that can model fires, explosions, toxic clouds and combine them into risk contours.
In this review we compare the main tools you will see in South Africa and abroad:

• DNV PHAST/Safeti – industry standard and our primary tool.
• Gexcon EFFECTS/RISKCURVES – strong European alternative.
• ALOHA – free tool for quick checks, with clear limits.
• Other tools – FRED, Canary, SuperChems.
  We also cover:
• Typical licence costs in South African Rand.
• Which software is accepted for MHI submissions.
• The 2026 trend: Integrating AI and machine-learning driven Digital Twins with traditional QRA software.
• How to choose the right tool for your project.
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  Free Resource: Need a fast breakdown to share with your team? Download our branded QRA Software Tools Comparison Guide.

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1. DNV PHAST & Safeti (The Industry Standard)

Developer: DNV (Det Norske Veritas)
Status: The Global Market Leader
Website: dnv.com/software
If you walk into any major oil & gas company (Shell, BP, Sasol, Chevron), they are likely using PHAST (Process Hazard Analysis Software Tool) and Safeti.

What It Does

Module	Function
PHAST	Consequence modelling – discharge, dispersion, fire, explosion
Safeti	QRA – combines PHAST results with frequency data to produce LSIR contours and F-N curves
Safeti Offshore	Specialised for offshore platforms

Pros

• Validation: The most extensively validated software in the world. Its Unified Dispersion Model (UDM) is accepted by virtually every regulator.
• Comprehensive: Handles everything from pool fires to toxic infiltration into buildings. (See our guide on Consequence Modeling for details.)
• Safeti Integration: Seamlessly calculates risk contours (LSIR) and F-N curves for full QRA.
• Regulatory Acceptance: Accepted by the Department of Employment and Labour, SANAS-accredited AIAs, and international regulators.
• Training & Support: DNV offers regular training courses in South Africa (Johannesburg, Cape Town).

Cons

• Cost: Extremely expensive – annual licence fees can exceed R500 000 for a full Safeti suite.
• Complexity: Requires a highly trained specialist to drive it. Garbage in, garbage out.
• Hardware Requirements: Large QRA models can be computationally intensive.

Typical Licence Costs (South Africa, 2025)

Product	Indicative Annual Licence (excl. VAT)
PHAST (single user)	R150 000 – R250 000
Safeti (single user)	R300 000 – R500 000
PHAST + Safeti bundle	R400 000 – R650 000
Note: Prices vary based on modules, user count, and support level. Contact DNV for a formal quote.

Who Uses It in South Africa?

• Sasol (Secunda, Sasolburg)
• Engen, Astron Energy, TotalEnergies (refineries)
• AECI, Omnia (chemical manufacturing)
• Anglo American, Sibanye-Stillwater (mining)
• Major AIAs and consultancies (including MMRisk)
  MMRisk Verdict: This is our primary tool. When legal defensibility is paramount, PHAST/Safeti is the only choice.

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2. Gexcon EFFECTS & RISKCURVES (The European Contender)

Developer: Gexcon (originally TNO Netherlands)
Status: Strong European Presence
Website: gexcon.com/software
Developed by the Dutch research organisation TNO, this software is scientifically rigorous and widely respected, particularly in Europe and increasingly in South Africa.

What It Does

Module	Function
EFFECTS	Consequence modelling – based on the famous "Yellow Book" (CPR 14E) models
RISKCURVES	QRA – calculates LSIR contours, F-N curves, societal risk

Pros

• User Interface: Generally considered more modern and user-friendly than PHAST.
• The "Yellow Book": Built directly on the CPR 14E models, which are the bible of consequence modelling in Europe.
• Visualisation: Excellent 3D mapping capabilities with Google Earth integration.
• Cost: Typically 20–30% cheaper than DNV PHAST/Safeti.
• Regulatory Acceptance: Accepted by European regulators (COMAH, Seveso) and increasingly by South African AIAs.

Cons

• Market Share: Less common in the English-speaking oil & gas world than PHAST.
• Training Availability: Fewer training courses available in South Africa compared to DNV.

Typical Licence Costs (South Africa, 2025)

Product	Indicative Annual Licence (excl. VAT)
EFFECTS (single user)	R100 000 – R180 000
RISKCURVES (single user)	R200 000 – R350 000
EFFECTS + RISKCURVES bundle	R280 000 – R450 000

Who Uses It in South Africa?

• Some AIAs and consultancies as a secondary tool.
• European-owned facilities (e.g., some chemical plants).
• Academic institutions for research.
  MMRisk Verdict: A solid alternative to PHAST/Safeti, especially for European clients or when budget is constrained. We maintain RISKCURVES capability for projects where it is specified.

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3. ALOHA (The Free Option)

Developer: US EPA / NOAA
Status: Public Domain (Free)
Website: epa.gov/cameo/aloha-software
ALOHA (Areal Locations of Hazardous Atmospheres) is a free tool designed for emergency responders.

What It Does

• Models toxic gas dispersion (Gaussian and heavy gas).
• Models thermal radiation from fires (pool fire, BLEVE).
• Models overpressure from explosions (VCE, BLEVE).
• Integrates with CAMEO Chemicals database and MARPLOT mapping.

Pros

• Free: Accessible to everyone – no licence cost.
• Fast: Great for a quick "what if" check during a HAZOP study or emergency drill.
• Easy to Learn: Minimal training required for basic use.
• Chemical Database: Includes properties for 1 000+ chemicals.

Cons

• Limited Physics: Uses simplified Gaussian / Heavy Gas models that break down in complex scenarios (e.g., near-field jet fires, two-phase releases).
• No Risk Integration: Only does consequence (distance), not risk (frequency × consequence). You cannot generate risk contours with ALOHA alone.
• Not for MHI Reports: Generally not accepted for formal MHI regulatory submissions in South Africa for complex sites.
• No Multi-Scenario: Cannot combine multiple release scenarios into a cumulative risk picture.

When ALOHA is Appropriate

Use Case	Appropriate?
Emergency response planning	✓ Yes
Quick screening during HAZOP	✓ Yes
Training and education	✓ Yes
Formal MHI QRA submission	✗ No
Land-use planning decisions	✗ No
Insurance or legal defence	✗ No
MMRisk Verdict: Useful for quick checks and emergency planning, but not suitable for formal MHI assessments or regulatory submissions.

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4. Other QRA Software Tools

Shell FRED

Developer: Shell Global Solutions
Status: Proprietary (Shell internal use)
FRED (Fire, Release, Explosion, and Dispersion) is Shell's in-house consequence modelling tool. It is not commercially available but is used extensively within Shell and by Shell contractors.

Quest Canary

Developer: Quest Consultants (USA)
Status: Commercial
Canary is a consequence modelling tool popular in the USA, particularly for LNG and petrochemical applications. Less common in South Africa.

ioMosaic SuperChems

Developer: ioMosaic Corporation (USA)
Status: Commercial
SuperChems is a comprehensive process safety software suite that includes consequence modelling, relief valve sizing, and reactive hazard analysis. Used by some multinational chemical companies.

BowTieXP

Developer: CGE Risk Management Solutions
Status: Commercial
BowTieXP is not a QRA tool per se, but a barrier management and risk visualisation tool. It is widely used in South Africa for Bow-Tie diagram development and integrates with QRA outputs.

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5. Software Comparison Summary

Feature	PHAST/Safeti	EFFECTS/RISKCURVES	ALOHA
Consequence Modelling	✓ Comprehensive	✓ Comprehensive	✓ Basic
Risk Contours (LSIR)	✓ Yes	✓ Yes	✗ No
F-N Curves	✓ Yes	✓ Yes	✗ No
Regulatory Acceptance (SA)	✓ Full	✓ Accepted	✗ Limited
Cost	High	Medium	Free
Training Required	High	Medium	Low
User Interface	Dated	Modern	Simple
AI / Digital Twin Integration	Moderate/Growing	Moderate/Growing	None
SA Support/Training	✓ Available	Limited	Self-service

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6. Why Software Choice Matters

You might ask, "Why pay for a consultant using expensive software when I can download ALOHA for free?"
The answer is accuracy and defensibility.

Accuracy

Different software tools can produce significantly different results for the same scenario:

Scenario	PHAST Result	ALOHA Result	Difference
Ammonia toxic cloud (IDLH distance)	850 m	1 200 m	+41%
LPG pool fire (12.5 kW/m² radius)	45 m	38 m	-16%
VCE overpressure (0.1 bar radius)	120 m	95 m	-21%
Note: These are illustrative examples. Actual differences depend on scenario specifics.

Defensibility

In a legal dispute or regulator inquiry, the accuracy of your risk contour matters:

• A contour that is 50 metres too wide could sterilise millions of Rands of land unnecessarily.
• A contour that is 50 metres too small could put people in danger and expose you to liability.

Cost of Getting It Wrong

Consequence	Potential Cost
Land sterilisation (false positive)	R10 million – R100 million+ in lost development value
Incident in "safe" zone (false negative)	Fatalities, prosecution, R100 million+ in damages
Regulatory rejection of MHI report	R100 000 – R500 000 in rework, plus delays

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7. How to Choose the Right Tool

For Formal MHI Assessments

Use: PHAST/Safeti or EFFECTS/RISKCURVES
These are the only tools accepted by South African AIAs and the Department of Employment and Labour for formal MHI risk assessments under SANS 1461.

For Emergency Response Planning

Use: ALOHA (for quick estimates) or PHAST (for detailed planning)
ALOHA is sufficient for emergency drill planning and first-responder training. For detailed evacuation zone definition, use PHAST.

For HAZOP Support

Use: ALOHA (for quick "what if" checks) or PHAST (for detailed follow-up)
During a HAZOP, ALOHA can provide quick estimates of consequence distances. Detailed modelling should be done post-HAZOP with PHAST.

For Land-Use Planning

Use: PHAST/Safeti or EFFECTS/RISKCURVES
Municipal planning decisions require defensible risk contours. Only use industry-standard software.

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Why MMRisk Uses Premium Software

We invest in DNV PHAST/Safeti licences (and maintain RISKCURVES capability) because our clients need to know that their risk profile is calculated with the highest possible precision.
Our software investment:

• DNV PHAST/Safeti – primary tool for all MHI assessments.
• Gexcon RISKCURVES – secondary tool for specific projects.
• ALOHA – for quick screening and emergency planning support.
  Our team:
• All QRA engineers are DNV-trained and certified.
• Regular software updates and model validation.

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Conclusion

The choice of QRA software directly affects the accuracy, defensibility, and regulatory acceptance of your risk assessment.
Key takeaways:

• PHAST/Safeti is the industry standard – use it for formal MHI assessments.
• ALOHA is free but limited – use it only for quick checks and emergency planning.
• The March 2026 Trend: Regulatory bodies are increasingly scrutinizing the exact models and versions used. Incorporating AI-driven operational data (Digital Twins) alongside traditional PHAST modeling is the next frontier.
• Don't gamble on your risk model – the cost of getting it wrong far exceeds the cost of using proper software.

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Ready for a Defensible QRA?

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