Lessons from losses – tire inflation
The following article was provided by SafetyNow and permission was granted for its use.
A truck driver was killed while he was inflating a tire. Preliminary investigations indicate the driver sustained fatal injuries when the tire he was inflating exploded.
Need to know
Inflating a tire in the workplace sound likes a routine function without a great deal of danger. But this perception is illusory because the hazards of the task can be deadly.
Inflated tires, particularly truck tires, contain a large amount of stored energy. Tires are designed to withstand this, but if they are damaged or have been used while flat (or significantly underinflated), they may fail. Tire damage due to underinflation cannot always be detected by external inspection. If a tire fails during inflation, the explosive force can be released, resulting in a destructive air blast and the ejection of high-speed particles. If the wheel is not restrained, it can fly through the air. The rapid release of explosive force from a ruptured tire can result in serious injuries or even death.
Prosecutions and compliance
In 2014, a company settled a matter for $207,401 after the worker received serious facial fractures and another minor leg injury when they attempted to fit and inflate a tire to a damaged truck rim. The tire exploded as it was being inflated.
On average each year there are 36 workers compensation claims accepted for injuries relating to being hit or trapped by an explosion involving vehicle wheels and tires. From 2013 to May 2019, Workplace Health and Safety Queensland (WHSQ) has been notified of 23 events involving exploding tires and issued seven statutory notices relating to the risk of tire explosions.
Health and safety risks must be managed to eliminate danger. However, if it’s not reasonably practicable to eliminate the risk, it should be minimized using the hierarchy of controls. This can be achieved by doing one or more of the following:
- Substituting the hazard with one that is of lesser risk. For example, if a truck tire has been identified as underinflated while in use, do not immediately re-inflate the tire. Instead, fully deflate the tire and replace the wheel with a spare and have the tire inspected by a competent person to determine if it is safe to put back into service.
- Isolating the hazard from workers:
• Deflate tires prior to them being removed from the machinery or vehicle and inflate tires in a safety cage or other portable restraint device.
• Never reach into the cage during inflation or deflation, and always position the body to one side of it.
- Implementing engineering controls – for example, by fitting:
• A long enough air hose with a clip-on valve nozzle and remote pressure gauge for workers to stay outside of an exclusion zone (i.e. the potential trajectory or explosion zone).
• A remote dump valve capable of rapidly deflating the tire in an emergency.
- Any remaining risk must then be minimized by using administrative controls. For example:
• Have a regular tire maintenance schedule which checks tires for condition, matching, pressure, tread depth, and wear patterns, and rims for corrosion or cracking.
• Always follow the recommended tire servicing procedures and ensure all workers undertaking these procedures are trained and follow them.
• Inform, train, and supervise staff in safe personal positioning and safe procedures during tire inflation including actions when a potential tire failure is identified.
• Potential trajectory paths from a failure and exclusion zones have been identified.
• Inspect the wheel for damage and corrosion prior to the refitting of tires.
• Inspect tires (new or used) for defects.
• Have workers stand outside of any exclusion zones.
• Only inflate tires to the recommended pressure.
• Ensure all safety cages, air lines, and associated equipment are suitable for the task and maintained in a safe working condition.
If a residual risk remains, it must be minimized so far as reasonably practicable by using personal protective equipment (PPE). For example, wearing protective goggles or face shields when working on wheels or tires.
Safe tire inflation – do’s and don’ts
- Don’t lean over the assembly during inflation.
- Don’t sit or stand near the assembly.
- Don’t use valve connectors that require the operator to hold them in place.
- Don’t exceed the manufacturer’s recommended tire pressure for the size and rating of the tire.
- Don’t use air lines not fitted with either a pressure gauge or pressure control device.
- Don’t allow the control valve to be jammed open (which would allow the operator to leave the inflating tire unattended).
- Do use a clip-on chuck to connect the air line with a quick release valve (i.e. dump valve) at the operator’s end (allowing tire deflation from a safe distance if problems occur).
- Do ensure the air line hose is long enough to allow the operator to stay outside the likely explosion trajectory during inflation.
- Do use enough bead lubricant when seating the tire.
Source: SafetyNow, SafeSupervisor, September 2021 newsletter
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