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A Fire and Explosion Risk Analysis answers a narrower question than a full QRA and a more decision-useful one than a hazard list: for the fire and explosion scenarios credible at this site, what physical effects reach which points, and does anything escalate?
What FERA produces
Radiation contours
Thermal radiation is assessed at several thresholds because different things matter at different levels - what equipment can withstand for a sustained period, what causes escalation to adjacent inventory, what allows personnel a short exposure while escaping, and what makes an area untenable immediately.
Overpressure contours
Blast overpressure is assessed against what structures and occupied buildings can take. Control rooms, substations and manned buildings are the usual focus, because these are where people are concentrated and where a decision - reinforce, relocate, or accept - has to be made.
Escalation assessment
This is the part that changes decisions. A single event is one problem. A single event that heats a neighbouring vessel until it fails is a different problem entirely, and the difference usually comes down to separation distance, fireproofing or emergency isolation - all of which are cheaper to get right early.
Survivability of safety-critical systems
If emergency shutdown, firewater, or fire and gas detection sit inside the affected zone, they may not function when they are most needed. FERA checks whether the systems relied on to control the event can survive it.
Flare radiation studies
A flare radiation study is a specific application of the same methods. It assesses radiation at grade and at working platforms under both normal flaring and emergency relief cases, and compares it with the levels at which personnel can work continuously, can pass through briefly, or must not be present at all.
It matters most when a plant is being extended, when a new relief case increases flare load, or when new occupied areas are proposed within reach.
Where FERA sits
| Study | What it answers |
|---|---|
| HAZOP | What scenarios are credible? |
| Consequence analysis | What physical effects does each produce? |
| FERA | For fire and explosion specifically - what reaches what, and does it escalate? |
| QRA | Combining effects with frequency, what is the risk? |
When a plant needs one
- Siting or extending an occupied building near process areas
- Adding hazardous inventory, or changing to a more hazardous service
- A regulator, insurer or corporate standard asking for quantified fire and explosion risk
- Escalation concerns raised during HAZOP that nobody can close without numbers
- MAH documentation and safety report preparation
- A flare modification or a new relief case
What separates a useful FERA from a filed one
A FERA earns its cost when its outputs land in decisions - a separation distance, a fireproofing scope, a relocated building, an isolation philosophy. When the report ends with contours and no recommendations tied to specific choices, it tends to be read once and shelved.
Frequently Asked Questions
What is the difference between FERA and QRA?
FERA focuses specifically on fire and explosion scenarios and their physical effects - radiation, overpressure and escalation. QRA is broader, covering all major hazard scenarios including toxic release, and combines consequence with frequency to produce risk measures such as individual and societal risk.
What is escalation in a fire and explosion study?
Escalation is when one event causes another - for example radiation from a pool fire heating an adjacent vessel until it fails, releasing further inventory. Escalation assessment is often the most decision-relevant part of a FERA, because it drives separation distance, fireproofing and emergency isolation requirements.
What is a flare radiation study?
It assesses thermal radiation from a flare at grade and at working platforms, under normal and emergency relief conditions, and compares it against the levels at which personnel can work continuously, pass through briefly, or must not be present. It is typically triggered by plant extensions, new relief cases or proposed occupied areas within reach.
Do we need a FERA if we already have a QRA?
Often not separately, since a QRA covers fire and explosion scenarios within its scope. A standalone FERA is useful when a specific decision hangs on fire and explosion effects - an occupied building siting question, a flare modification, or an escalation concern - and a full QRA would be disproportionate.
What thresholds are used for radiation and overpressure?
Assessment is done at several levels because different effects occur at different intensities - equipment damage, escalation to adjacent inventory, limits for brief personnel exposure during escape, and levels that make an area immediately untenable. Specific values depend on the standards and corporate criteria a facility works to.
Need expert help with this?
We carry out FERA and flare radiation studies for petrochemical, chemical and pharmaceutical facilities, including escalation assessment.
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