Oil Spill, Missing Guard and a Tin of Thinner: Ordering the First 30 Minutes
At a 14-apprentice fitting shop in Nashik the morning shift starts at 8:00. During the night shift the hydraulic hose on the power hacksaw burst and about 4 litres of oil spread over a 3 m stretch of walkway between the hacksaw and pedestal grinder No. 2. A sweeper has thrown sawdust over it and gone home. The pedestal grinder's left wheel has a 10 mm gap between the wheel and the tool rest, its tongue guard is missing, and a 5-litre tin of thinner has been left on the bench 1.5 m away because the paint section store is full. Two apprentices are wearing open sandals and one has a loose, unbuttoned shirt sleeve. The supervisor is in a meeting and has told you, the senior apprentice, to 'get the job going, we have 40 brackets to finish by 4 pm'.
1. Set out, in order, the actions you take in the first 30 minutes and justify why that order and not another.
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Order by severity × likelihood, and follow the hierarchy of controls (eliminate, engineering, administrative, PPE) rather than convenience.
- Stop and isolate the grinder. Switch off and lock/tag it at the isolator. It is the only ignition source in the area and it has two guard defects, so it must not be startable while the fuel is present.
- Remove the fuel. Take the thinner tin to the flammable store. Thinner has a flash point far below shop temperature and its vapour is heavier than air, so it creeps along the floor towards sparks.
- Clean the spill properly. Sawdust is not spill control: it hides the film, stays slippery and becomes a combustible oil-soaked solid. Use absorbent granules, scoop into a lidded metal bin, then degrease the 3 m strip and dry it.
- Make the grinder safe before reuse - tool rest gap 2 mm maximum, tongue guard refitted, wheel ring-tested. If spares are not available, keep it tagged out.
- Then correct footwear and sleeves: closed leather shoes, sleeves buttoned or rolled above the elbow.
Steps 1 and 2 remove ignition and fuel within minutes; PPE cannot stop a fire or a slip, so it is the last layer, not the first.
2. The supervisor says the sawdust has 'soaked it up' and tells you to start work. Write what you would say to him, and explain the technical basis of each point.
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A workable reply: 'Sir, the sawdust is hiding an oil film, so the walkway is still a slip hazard, and oil-soaked sawdust itself burns. The grinder also has no tongue guard and a 10 mm tool-rest gap, and there is thinner 1.5 m away. I have locked the grinder off and I need 20 minutes to clean the floor and get the guard fitted, otherwise we risk a fire and a fall injury on the same shift.'
Technical basis:
- Slip: sawdust on an oil film forms a soft, rolling layer; it does not remove the lubricant, and the coefficient of friction stays low, especially with the monsoon humidity.
- Fire: oil-soaked wood dust is a combustible solid with a large surface area; hot sparks or grinding particles can ignite it, and it will smoulder unseen under the machine.
- Legal/practical: the guard defects are reportable to the safety officer, and an injury on a known, uncorrected hazard is indefensible during an inspection.
The point is to offer a time-bound alternative, not simply to refuse the instruction.
3. Classify the hazards into those you can correct yourself, those that need written reporting, and those that are purely a supervision/PPE matter. Give reasons.
Read the worked answer
Correct yourself now (low cost, no authority needed): move the thinner to the flammable store, uncoil and route any leads away from the wet strip, put on closed shoes if available, roll your own sleeves, and place a 'wet floor' barrier over the 3 m strip until it is cleaned.
Report in writing to the safety officer and maintenance (beyond apprentice authority): the missing tongue guard and 10 mm tool-rest gap (a machine-guard defect requiring a spare part and a record), the burst hacksaw hose (the machine must be isolated and the hose replaced with the correct pressure rating), and the sawdust practice used by the housekeeping contractor.
Supervision/PPE matter: enforcing the footwear rule and the no-loose-clothing rule is the supervisor's job. PPE is the last line of defence because it protects only the wearer, fails silently (worn soles, torn sleeves) and does nothing about the fire, the slip or the unguarded wheel. Fix the hazard, then dress for what is left.