Posted By Bob Pedley
Peter,
We use the following as a guide but require all our incidents to be assessed for their individual severity potential. From this we instigate the appropriate level of investigation.
Near Miss
Basic principle of a near miss is that an injury, or loss below a defined level, did not actually occur, but the events, actions by people, equipment failures, or exposure to energy sources/chemicals that were observed could have caused loss under slightly different circumstances. The prime aim in reporting and investigating ‘near misses’ is to avoid injuries and other losses without the cost. In other words, a free lesson.
EXAMPLES
People Damage
Firstly, if no actual injury occurred but someone could have ‘been struck by an improperly slung load’, ‘fallen due to inadequate barriers’, ‘struck by a passing vehicle’, ‘caught in unguarded machinery’, ‘suffered chemical exposure through improper use of PPE’, ‘been exposed to an electrical current through inadequate isolation’, etc. The aim is to look for potentially significant injuries not minor events which should show up in normal hazard spotting systems and daily logs.
Secondly, where an actual injury did occur (was in itself regarded as small) but had the potential to have caused major injury or death – a cut was sustained to a finger when caught in an unguarded guillotine press, the potential being to have cut off a hand – a minor inhalation was suffered whilst working unprotected in a vessel, the potential being to be fatally exposed, etc.
Property Damage
When something was damaged, only to a low level (that is, below a few hundred pounds) but a much more significant event could have happened costing thousands or more. Alternatively no damage happened but again a large loss could occur under different circumstances. This would include vehicles scraping against pipework causing minor repairs but could have pulled down a whole gantry, a crane lifting and dropping a block of lead onto the floor when it could have fallen on to a furnace, an operating malpractice which over-pressured a vessel but could have caused it to rupture, etc.
Major Hazard Potential
Where a loss was sustained with small effects but could have been a major incident. If a small release of flammable chemical which was normally an environmental breach could have caught fire and caused a much larger incident (as in storage areas) in the particular circumstances at the time. Or a drum of compound fell off a lorry without puncturing in the middle of a motorway. Wrong material going into a tank where chemicals are not compatible.
A NEAR MISS (continued)
Process Loss
When an equipment failure, inadequate operational standard, deviation from procedure or unsatisfactory laid-down instruction causes a minor loss below several hundred pounds but could easily have caused the loss of tens of thousands of pounds of product, or caused an environmental loss, or when the pressure in a still rose abnormally but stopped just short of bursting disc failure, had it gone further an emission to atmosphere would have resulted.
Environmental Loss
Where no breach of consent actually occurs but slightly different circumstances could have caused a major emission – a raised pH in the boundary ditch through a slight overflow of caustic which under other circumstances could have been several tonnes.
Fire Potential
Where no actual smoke or fire occurs but the necessary conditions were nearly realised. An over-heating smell in electrical equipment, hot ducting from pyrophoric dusts, sparking in a hazard zone area, an over-heating pump bearing on lead alkyl duty where explosive decomposition could occur.
Excessive Energy Sources
Lightning strikes with no actual loss, major electrical overload, heat wave causing undue personnel burden, severe cold weather conditions without loss occurring, unusually large wave striking a ship, high wind causing a vehicle to swerve.