Electrolyte Spill in a Battery Room with Failed Ventilation

Hazards and failures:

• Chemical: dilute sulphuric acid causes burns and eye damage; the 'weak acid' assumption is the root attitude failure. No goggles, no face shield, no acid-resistant apron or gloves.
• Atmosphere: flooded lead-acid cells release hydrogen while on charge. Ventilation has been off for two months and the sensor is two years out of calibration, so there is no reliable gas indication - an explosive atmosphere is possible and no hot work or spark should be allowed.
• Electrical: 48 V is not a shock hazard in the usual sense, but a 600 Ah bank can deliver thousands of amperes into a short circuit. A metal wristwatch or a dropped jug bracket across terminals causes arc flash, burns, and metal vapour. No insulated tools, no rubber mat, no terminal covers.
• Work practice: carrying an open jug of acid across the room instead of using a proper container and a decanting station; acid-stained, slippery floor; no spill kit; no barrier.
• Organisational: ventilation and gas detection out of service with no work restriction, no permit, no job risk assessment, no buddy with a spill kit.

48 V DC is 'low voltage' but not 'low energy'. Treat the bank as an arc-flash and short-circuit hazard at all times.

Order of actions:

1. Stop and make safe: the colleague should trip the charger and then the DC load breaker, using the correct switching sequence and standing to the side, and should not create a spark near the spilled electrolyte or the battery top. Do not operate anything that could arc inside a possibly hydrogen-rich room.
2. Eye first: irrigate the left eye immediately with clean, low-pressure water or eyewash for at least 15 minutes, holding the eyelid open, from the inner to the outer corner. Remove contact lenses if present. This cannot wait for transport.
3. Skin: remove contaminated clothing and flush the forearm under running water for at least 15 minutes. Do not neutralise with a base - neutralisation generates heat and worsens the burn.
4. Medical: arrange transport to hospital, taking the safety data sheet or product name. Eye splash always needs medical assessment even if it feels better.
5. Contain: only after the casualty is being treated, ventilate the room and absorb the spill with a spill kit (never dry sweep, never use combustible material).

Report as a near-miss/incident; the colleague's instinct to kill the breaker was right in principle but must be done without arcing in a gassy room.

Stop-work conditions (job does not proceed until fixed):

• Ventilation restored and proven running, or forced cross-ventilation with a gas meter used continuously. Hydrogen detection with a calibrated instrument; the sensor must be recalibrated or replaced.
• Correct PPE: chemical goggles or face shield, acid-resistant gloves and apron, safety footwear; no metal jewellery or watch; insulated tools and terminal protection.
• Spill kit, eyewash and running water within the room or immediately outside it; non-slip, acid-clean floor.
• A written risk assessment, a permit for battery work, and a second person present.

Next priority:

• Decanting station with a proper container and funnel; never carry open acid across the room.
• Training and refresher on acid handling and first aid, including the 'weak acid' misconception.
• Preventive maintenance schedule for ventilation and gas detection, with records.
• Incident reporting and investigation, including why a two-month ventilation outage was allowed to persist.

Priority order is life safety first, then engineering controls, then administrative controls and training. PPE is the last line, not the first.