Blog

Tunnel fire scene inside a long alpine road tunnel at night — wet asphalt reflects warm sodium lighting under a curved concrete vault, two jet fans hang from the ceiling, a green emergency exit sign glows above a steel refuge door and an emergency telephone on the right wall, a stopped lorry far down the bore trails grey smoke that flattens along the ceiling, and a tunnel safety engineer in a hi-vis jacket and white hard hat stands by a service pickup in the foreground reading an event-tree diagram and a falling risk curve on a tablet

📈 Fire Risk Assessment September 8, 2026 · 18 min read

Road Tunnel Fire Risk: The QRA Born From Mont Blanc 1999

The Mont Blanc tunnel fire killed 39 people in 1999. Here come the event trees, design fires, critical velocity and F-N lines that now govern tunnel QRA.

ALARP weighing at a grid-scale battery storage site at golden hour — rows of white lithium-ion battery containers behind a chain-link fence with a brick house beyond, an antique brass balance scale on a weathered steel site table with a stack of coins on one pan and a small steel model of a battery container on the other, an open safety case binder showing a red, amber and green inverted tolerability triangle, and a fire safety engineer in a hi-vis vest and white hard hat resting a hand on the binder while studying the scale

📈 Fire Risk Assessment September 6, 2026 · 19 min read

ALARP: How 'As Low As Reasonably Practicable' Became Law

ALARP turns a 1949 mining case into a legal test. Here come the tolerability limits, the gross disproportion arithmetic, and how a BESS case uses them.

Evacuation test in a shopping mall atrium seen from a mezzanine — a thin grey smoke layer hangs flat under the glass roof while the air below stays clear, shoppers walk toward a green-lit exit and bunch up at the doors, red strobe beacons flash on the concrete columns, and a fire engineer in a navy jacket in the foreground holds a tablet showing two coloured bars labelled ASET and RSET

🛡️ Fire Safety Engineering September 4, 2026 · 19 min read

ASET vs RSET: The Inequality Behind Every Evacuation Plan

ASET vs RSET decides whether a building passes. Here come the timeline, the tenability limits, the equations, and the one term that swings the answer most.

Solid-state battery abuse test in a dim laboratory — a cream-white ceramic electrolyte disc stands upright in a steel clamp beside a strip of bright silver lithium foil on a black anvil, a flat pouch cell on a scorched steel plate glows faint orange at one swollen corner and gives off a thin wisp of grey smoke with no flame, a thermal camera monitor behind shows the cell as a yellow and red hot spot on a blue field, a handheld gas monitor with an amber LED reads H2S 12 ppm, thermocouple wires run across the cell, and a technician in navy coveralls and safety glasses watches from behind a scratched acrylic blast shield

🔋 Battery Fire Safety September 2, 2026 · 19 min read

Solid-State Battery Fire Risk: A Sober Look at What Changes

A solid-state battery drops the flammable solvent, not the oxidizer or the lithium. Here comes what changes in thermal runaway, and what stays put.

Off-gas detection during a battery abuse test in a dim laboratory — a large prismatic lithium-ion cell stands on a scorched steel test frame with its safety vent just split open, a thin curl of pale white solvent vapour rises into a stainless steel collection hood with no flame anywhere, a small cylindrical gas sensor probe with a glowing amber LED hangs a few centimetres above the vent on a black cable, an instrumentation rack behind shows a rising green gas trace and a red GAS ALARM banner, thermocouple wires tape across the cell face, and a technician in navy coveralls and safety glasses watches from behind a scratched blast shield

🔋 Battery Fire Safety August 29, 2026 · 17 min read

Off-Gas Detection: The Warning Before a Battery Fire

Off-gas detection reads the vapour a failing cell breathes out before flame. Here comes the window it buys, the sensors that see it, and the limits.

Firefighters cooling a lithium battery fire at dusk on a wet training pad — a silver electric hatchback stands jacked on timber cribbing with its underfloor pack glowing orange and venting a sideways jet of flame, two firefighters in tan bunker gear and SCBA kneel behind a hoseline and drive a heavy water stream under the car, dense white steam rolls across the flooded concrete under portable floodlights, a third firefighter holds a thermal-imaging camera showing a bright hot spot, and a spent CO2 extinguisher lies discarded in the foreground puddle

🔋 Battery Fire Safety August 22, 2026 · 16 min read

How to Put Out a Lithium Battery Fire Without Smothering

A lithium battery fire shrugs off CO₂, halon and dry powder. Here comes the heat budget that explains why water, and only water, ends the event.

Battery module propagation test in a dark laboratory — eight large prismatic lithium-ion cells stand clamped on a scorched steel table with thin white barrier sheets between them, the third cell vents a long jet of white-hot gas and sparks sideways while its neighbour glows dull red, grey vent gas rolls across the back wall, dozens of thermocouple wires run from the cells to an instrumentation rack showing live temperature traces, and two technicians in orange fire-resistant coveralls and hard hats watch from behind a scratched blast shield

🔋 Battery Fire Safety August 21, 2026 · 19 min read

Thermal Runaway Propagation: How One Cell Takes a Pack

Thermal runaway propagation turns one failed cell into a lost pack. Here comes the heat budget that decides it, and the design that stops it.

Full-scale fire resistance furnace test in a modern laboratory — a brick wall specimen sits in a heavy steel furnace frame with a hydraulic loading ram above it, orange flames glow through observation ports along the furnace side, a thick bundle of thermocouple wires runs from the cool unexposed face to an instrumentation rack showing live temperature traces, and two technicians in white lab coats and hard hats watch from behind a yellow floor line

📊 Fire Testing August 5, 2026 · 19 min read

Reaction to Fire vs Fire Resistance: What Each Test Proves

Reaction to fire ranks how a product feeds a growing fire. Fire resistance times how long an assembly holds. Mixing up the two has killed people.

Single Burning Item reaction-to-fire test running in a modern fire laboratory — a right-angled corner specimen of two pale wall boards stands on a steel trolley inside a metal-lined test chamber, a triangular sand-box burner at the foot of the corner throws a tall orange flame up both faces, a stainless steel collection hood and exhaust duct hang overhead, and a technician in a white lab coat watches from beside an instrumentation rack

📊 Fire Testing July 31, 2026 · 21 min read

Euroclass A to F: How Europe Rates Reaction to Fire

A Euroclass such as B-s1,d0 comes from the SBI test. Here is what each letter measures, and why a component class never proves a facade will hold.

📊 Fire Testing July 29, 2026 · 17 min read

UL 94 V-0 Decoded: What the Plastic Fire Rating Means

A UL 94 V-0 mark means a plastic bar self-extinguishes under a 50 W flame. Here is what the test measures, and the four things it never promises.

Night scene of a fully involved house fire beside a narrow gap, its radiant heat scorching the dark facade of the neighbouring home while fire trucks stand by on the street.

🔥 Fire Fundamentals July 24, 2026 · 12 min read

Radiant Heat: Why Fire Jumps the Gap Between Buildings

Convection burns up; radiation burns across. How radiant heat, the T⁴ law, and view factors decide whether fire ignites the house next door.

A dark modern living room at night where a small flame burns on a sofa cushion, spreading outward in a glowing ring of fire across the fabric while thin smoke gathers under the ceiling and a wall clock hangs in the shadows — the first seconds of fire growth.

🔥 Fire Fundamentals July 21, 2026 · 14 min read

The t-Squared Fire: How Fire Growth Rate Shapes Escape Time

Slow, medium, fast, ultrafast: how the t-squared curve turns fire growth into numbers, and why modern fuels outrun its four classes.