OHS Code Explanation Guide

Published Date: July 01, 2009
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Part 36 Mining

Section 591 Design safety factors

Subsection 591(1)

These design and operational requirements are intended to prevent worker injuries.

(a) Without shock-absorbing seats, drivers could be subjected to chronic injuries from the whole-body vibration generated while travelling on rough mining roads.

(b) Stop blocks, railings or a small ditch that will catch and hold the wheels of a vehicle can be used to prevent parked vehicles from rolling. The intention here, however, is to have a mechanical device or parking brake as the fail-safe means of preventing unintentional movement.

(c) Starting an engine with the transmission engaged may cause the vehicle to jump or move unexpectedly. Any unexpected movement of the vehicle may threaten the safety of workers or nearby equipment.

Subsection 591(2)

Equipment stability can be a problem, especially when dump boxes have been altered or replaced to carry a larger volume of a lighter material. For example, replacement of a 100-ton truck dump box used to haul overburden that weights 3,000 pounds per cubic yard with the dump box from a 150-ton truck used to haul coal weighting about 2,000 pounds per cubic yard can disrupt the vehicle’s stability.

Although the GVW might remain within the equipment manufacturer’s recommended load specifications, this alteration can adversely affect equipment steering and braking and shift the centre of gravity.

Subsection 591(3)

The intent here is that the vehicle remain stable with the front wheels on the ground. In rare instances, where a short-term operational condition might present a problem, alternate procedures are allowed. The expectation however is that a proper hazard assessment is completed, safe work procedures developed, and workers advised and trained accordingly. Section 8 of the OHS Regulation requires the procedures to be in writing and available to workers.