Wheels and rims can be dangerous: They aren’t just vehicle bling!
Recognized wheels and rim hazards led OSHA to implement 29 CFR 1910.177 to ensure worker safety when servicing wheel components, mounting/dismounting/inflating/deflating tires, and inspecting wheels and rims. This standard applies only to the servicing of multi-piece and single piece rim wheels on large vehicles such as trucks, tractors, trailers, buses, and off-road machines.
Have you ever driven to a safety tailgate meeting, passed a vehicle tricked out with fantastic rims, and wish your work truck looked as cool? Ok, maybe you won’t admit it out loud, but we all know it registered within your subconscious at some level. Before we requisition for some spinners, though, we need to understand that wheels and rims aren’t just vehicle bling!
So, what’s so dangerous about wheels and rims?
Split rim wheels on larger vehicles differ from standard one-piece wheels. They’re multi-piece with the tire held in place by a locking ring. This makeup can give rise to failure of multiple components, including a violent separation of the ring from the wheel. Component failures can cause vehicle accidents while driving or significant injury to those servicing the wheels.
When fully inflated, truck tires can exert over 40,000 pounds of pressure against the rim flange. Failure of wheel and rim components has resulted in explosive releases of high-pressure air, causing a rapid dispersion of shrapnel toward workers. These explosions have resulted in serious injuries and fatalities to workers in the “trajectory zone” during an explosion separation or sudden release of air pressure.
OSHA recognizes heat as another hazard and prohibits it being applied to multi-piece wheels or components. As temperatures increase, metal can exceed normal operating thresholds, causing it to weaken and become pliable. Pliability combined with high pressures is a disaster waiting to happen. Eventually, the weakest parts of the multi-piece wheel will give way.
Finally, there are rare instances when rims may contain small quantities of magnesium. Magnesium and water do not mix, as a North Carolina fire department found out when dispatched to a vehicle fire. As they approached the vehicle with a 1 ¾-inch water hose line, there was an explosion from the violent reaction with water being introduced to the magnesium. One firefighter was rushed to the hospital with life-altering injuries.
How can I protect my workers?
Work vehicles are highly useful but can be extremely dangerous. Supervisors must ensure workers are protected from hazards by:
- Making sure workers understand the serious dangers surrounding wheels and rims.
- Developing specific procedures outlining hazards and safe work practices for servicing and maintaining wheels and rims. These must include the deflation of tires prior to removal of the wheel and tire from the vehicle.
- Requiring the use of restraining devices, barriers, standoff inflation devices, chocks, and whip protection to help control hazards associated with wheel components and servicing tools/equipment.
- Developing inspection procedures for ensuring tires and wheel assemblies are in safe working condition.
- Ensuring work areas are designated to best limit exposure within the trajectory zone until tires are safety deflated or inflated.
Key to remember
Death or serious injury can easily result from improper wheels and rims maintenance and/or insufficient training of associated hazards and controls. Employers must establish and enforce safe operating procedures for servicing multi-piece rim wheels and requiring the use of restraining devices, barriers, and other protective controls to ensure worker safety.