The Risk Management Tool Box Blog

Pyrolosis in Truck Tyres

Graham Marshall - Friday, July 19, 2013

Coming into contact with overhead power lines when driving can cause the tyres on trucks, cranes and other heavy vehicles to catch fire and explode.

Five workers have been killed by exploding tyres in Australia in recent years and many more injured as excessive heat developing in tyres has led to the unpredictable phenomenon known as pyrolysis.

Pyrolysis can occur when excess heat is applied to a tyre.

Often it is a result of electrical arcing and current flow when rubber tyred vehicles have been involved in high voltage electrical incidents.

The heat decomposes the rubber and other compounds used to manufacture the tyre, creating a ready fuel source.

The ratio of this fuel to the air used to inflate the tyres can then reach flammable or LEL (explosive) levels.

The explosive energy released during a tyre explosion can lead to serious injuries or fatalities and significant equipment damage.

Because of the amount of kinetic energy released, a danger area up to 300 metres away is typically required to be established.

Pyrolysis related explosions are unpredictable, sometimes happening immediately, sometimes up to 24 hours after the heat was applied to the tyres.

And the explosion can happen with no visible signs of a fire on the outside of the tyre before it explodes.

Besides electrical heat sources, other sources of heat that lead to pyrolysis in tyres include welding (e.g., on wheel rims), oxy/acetylene heating wheel nuts, overheating brakes and wheel motor fires.

Tyre explosions predominantly occur with split rim configurations, but can happen with all types of tyres.

Any pneumatic rubber tyred vehicle involved in an incident where an electrical fault results in discharges or arcing around or through the tyres should be considered a potential hazard.

Procedures to follow when there is a danger of a tyre explosion, such as when a rubber tyred vehicle has contacted overhead power lines include:

+ Parking the vehicle in an isolation zone, with a minimum 300 metre radius;

+ Removing everyone from the area, and not allowing anyone to re-enter the isolation zone for 24 hours; and

+ Alerting fire fighting services to the potential hazard.

It should be noted that if pneumatic tyres are filled with nitrogen instead of air, it reduces, if not eliminates the risk of pyrolyic tyre explosion.

{module_adrotator,1458}
{module_adrotator,1457}
Comments
Post has no comments.
Post a Comment




Captcha Image

Trackback Link
http://www.therisktoolboxshop.com/BlogRetrieve.aspx?BlogID=4103&PostID=353624&A=Trackback
Trackbacks
Post has no trackbacks.

Recent Posts


Tags

TK Shipping Social Responsibility NOPSA Raspberry Ketones Scam Working at height LOTO Drilling Safe at Home Unconventional Oil Workplace bullying Walking Hot work Unconventional Hydrocarbons Global Harmonized System Safety Conference PPE Psycho-social Hazards Customer Testimonial Isolation Control Rosedale Abbey Hydraulic Fracturing ("fracking") Sakhalin Energy Rail Safety Hierarchy of Safety Control Salute to Our Hero's Behaviour-based Safety (BBS) Procedure Training Course Work in Confined Spaces Emergency Response Best bars in the oil patch Natural Hazard Fire Prevention BP Water Corporation Thank God it's Friday Railway Safety OSHA Chevron Australian OSH Codes of Practice Safe Operating Procedure (SOP) ALARP Hazard Awareness Situational Awareness Contract Risk Management Fatigue Management WorkSafe WA UK HSE Nanotechnology Unconventional Gas APPEA Safety Video Hess HSE Leadership Safety Culture Survey Bio-hazards Occupational Overuse Syndrome Catostrophic Disaster Management of Change Coal Seam Gas Call Centers OHS Law one per center Job Safety Analysis Road Transport Risk Management Santos Aviation Safety Crane lifts Incident Investigation Pollution prevention US OSHA Manual handling Safety Management Program NORM Risk Assessment Farm safety Toolbox talk Slips, trips and falls Manufacturing Safety PowerPoint Presentation Construction Safety MSDS Safety Alert Ladder Safety Office Safety Excavations ENI Australia Newfield WMC Resources Process Hazard Management Driving Safety Safety "one per-center's" Kellogg Joint Venture NOPSEMA Hazard Spotting Hazardous Substances Electrical hazards WA Resources Safety Risk Tool Box Safety Moment Shell CSB Safety Information Posters Supervision Health Marine Safety Safety Awards Energy Model of Hazards Procedures IFAP Shale Gas Woodside Total Hospital Safety Working with explosives Kinetic Energy Mining Nautronix Oil Spill Response SPE HSE Innovation Award Radiation Sources Save our Seafarers Campaign BHP Billiton

Archive

Blog / Terms of Use / Site Map / Disclaimer / Risk Management Tool Box 2009. All rights reserved. Web design by Luminosity. E-Commerce by JStores.