In a workshop, fight only a small fire that you caught early, with your exit behind you, using water on wood and charcoal and dry sand on oil and metal. The 200 L barrel the workshop guide asks for can absorb at most about 518 MJ, about 6.5% of the heat in 1 m³ of dry wood, so a loaded workshop that is well alight is lost: get everyone out, count them, and wet the neighbouring buildings instead.
Part of Workshop & Forge Design
Workshop fire safety is the set of barriers, stored water and sand, exits and routines that stop a forge, kiln or fuel fire becoming a building fire, and the rules for when to fight and when to leave.
A Barrel Of Water Buys A Few Minutes, Not A Building
The workshop guide calls workshops the highest fire-risk structures in a settlement and lists six measures: non-combustible walls between workshop zones and neighbours, a clear space of at least 3 m (5 m better) around the workshop, a filled barrel or tank of at least 200 L inside or beside any workshop with fire, 2-3 buckets of dry sand near the forge and kiln for metal and grease fires, at least two exits on different walls, and no combustible storage in the fire zones. The wider rules are in the fire guide (Fire Prevention in Settlements).
The 3 m clear space is the least the guide asks of the workshop. The fire guide asks for 10 m between a house and a workshop (15 m preferred) and 8 m between workshops that use fire, doubled for combustible walls, and the building-spacing calculation shows 5 m is too little against a burning timber wall (Fire Breaks & Building Spacing). The two disagree, and the larger figures are the ones the calculation supports: 3 m is below the 5 m that only non-combustible walls can tolerate, so use the fire guide’s distances between buildings and read the 3 m as the least clearance from stacked material.
Worked Example: What 200 L Can Absorb
Inputs (recalled standard values, not read from this corpus): water 4.18 kJ per kg per K; heat of vaporisation 2,257 kJ/kg; dry wood about 500 kg/m³ and 16 MJ/kg, taken as the heat available from burning.
- Heat taken up per kilogram of water that is heated from 20 C to 100 C and then boiled: 80 × 4.18 + 2,257 = 334 + 2,257 = 2,591 kJ/kg.
- For 200 L (200 kg): 200 × 2,591 = 518,000 kJ = 518 MJ. This is the ideal case in which every drop reaches the fire and boils.
- Heat in 1 m³ of dry wood: 500 kg × 16 MJ/kg = 8,000 MJ.
- Ratio: 518 ÷ 8,000 = 0.065, about 6.5%.
Real use is worse, since water that runs off or falls on the wrong place absorbs nothing. A 200 L barrel at a bucket brigade’s 50-80 L a minute lasts 2.5 to 4 minutes (Water Points for Fire Fighting). The barrel is for a fire in its first minute or for wetting the neighbour.
What You Need
- A barrel of at least 200 L, covered, within reach of the forge and kiln but not behind them
- 2-3 buckets of dry sand, not damp: damp sand in hot oil can spit steam and spatter
- 10-15 buckets, kept at the water, not hung inside the workshop (water-points guide)
- Non-combustible walls and a bare-earth or stone floor in the fire zones
- Two exits on different walls, that open outward by pushing, with nothing to lift or unlatch
- A metal bucket for ash and a bare patch outside to put it on
Method: Prevent, Then Decide
Step 1: Close each day with a check: fire raked and out, embers in the metal bucket on bare ground, oily rags in water or spread flat, no fuel near the forge, doors clear.
Step 2: Sound the alarm first whenever fire is found, then decide.
Step 3: Decide to fight only if all are true: the fire is small (a bucket-sized flare or a smoulder), it is not between you and the exit, nobody is hurt or trapped, and a second person has the barrel ready.
Step 4: Use the right agent. Water on wood, charcoal and cloth. Dry sand or a lid on oil, grease and burning metal; never water.
Step 5: If it spreads past the first minute, leave. Everyone out, count at the assembly point (Emergency Assembly Areas), and wet the neighbours’ walls and roofs, not the burning building.
Common Mistakes
- Fighting with the fire between you and the door. The smoke does not give a second chance.
- Water on an oil or grease fire. It throws burning oil.
- Bucket brigade into a building that is already well alight. The brigade kills people and saves nothing.
- Re-entering for tools. The assembly-area guide’s rule: report the missing and let a crew decide.
- A single barrel shared by forge, kiln and carpentry. A fire at one is out of reach of the barrel at another.
Safety
Fight only what you can leave
A workshop fire grows faster than a bucket line and fills a room with smoke and carbon monoxide. Never fight a fire with the exit behind the fire; never enter a smoke-filled workshop; never use water on oil, grease or burning metal; and treat a smouldering charcoal or ash heap as a fire that can restart for days (Charcoal Safety Practices). If anyone is burned, cool the burn with running water at once (Burns Treatment).
What’s Next
- Learn next: Response Protocols & Training — the settlement-wide rules this fits into
- Combine with: Shared Infrastructure — fire cover for a whole district