WA’s Department of Mines, Industry Regulation and Safety (DMIRS) recently issued a safety alert following an incident in which a haul truck arrived at a workshop for maintenance with no tyres fitted in position 4 or 5.
The position 6 tyre casing blew out 15 days later, and four workers were working on the haul truck in close proximity to the tyre. One worker was thrown backwards by the percussive shock wave and knocked unconscious.
Two other workers received minor injuries (ringing in ears and light bruises). The workshop walls were damaged and projectile shrapnel was found up to 17 metres from the position 6 tyre.
During the 15 days, the truck had not moved and the tyres were cold, and the tyre casing that failed was a 46/90R57 size, of steel radial construction and with only 2000 hours of recorded service.
The alert said there were a number of contributing causes:
The alert subsequently recommended a number of required actions: