Dangerous Uncontrolled Release of Hydraulic Energy
An operator sustained minor injuries when the hydraulic hose for the bucket tilt function burst allowing pressurised fluidto smash the front windscreen on his wheel loader.
While the wheel loader was being operated a corroded hydraulic hose end released uncontrolled hydraulic fluid which ejected towardsthe driver’s windscreen. The energy from the uncontrolled release of hydraulic oil was sufficient for the hydraulic oil to penetrate the front windscreen of the loader, enter the driver’s compartmentand hit the driver. (See attached photos)
Oil hit glass here Oil ejected here
Mine Safety Report No: SA05-15 Comet ID: 31752524400 Prepared by: G Johnston Phone: 0417 985200 Date Created: 9November 2005
Preliminary investigation shows the hydraulic hose for the bucket tilt function failed where the hydraulic hose enters the hose fitting (hose end) which is located close tothe operator’s cabin. While the hose visually appeared to be in a relatively good condition, it failed due to corrosion. The hose has an operating pressure of approximately 31.5MPa (4,500psi). Whileinjuries were minor, this incident had the potential to be fatal. Further investigation with the OEM revealed a safety bulletin had been released in the USA and Canada on the 26 October 2005highlighting the issues that led to this very same incident.
Corroded hose end
This incident highlights the hazardous nature of uncontrolled pressurised fluids.Hydraulic energy is a major hazard if uncontrolled. To meet OH&S obligations equipment designers, manufactures and hirers must take all reasonable steps to advise equipment owners of faults and details torectify faults with their equipment. Refer to Chapter 5 Occupational Health and Safety Regulation 2001. All mines should: 1. Inspect all high risk hydraulic hoses on equipment to ensure they are...