Coal Inspectorate | Alert | No.400 V 1 | 03 November 2021
A 400kW electric pump motor has suffered a rapid pressurisation in the motor body resulting in the motor terminal cover catastrophic failing. It was ejected from the terminal box propelling metal fragments approximately 15 metres. A similar incident occurred in August 2000 (refer significant incident report no. 29).
A drive-end bearing has over heated due to a lack of lubrication and possible variable speed drive circulating currents. The temperature rise has resulted in an ignition of the bearing grease. This caused a significant pressure rise in the motor which has then resulted in the terminal cover fasteners failing and the cover being ejected with significant force. There were no electrical faults and the motor continued to run after the event.
Investigations are ongoing and further information may be published as it becomes available. The information in this publication is what is known at the time of writing.
We issue Safety Notices to draw attention to the occurrence of a serious incident, raise awareness of risks, and prompt assessment of your existing controls.
Contact: Greg Napper, Inspector of Mines (Electrical) , 0475 596 318 QldMinesInspectorate@rshq,qld,gov.au
Issued by Resources Safety & Health Queensland
All information on this page (Electric motor terminal cover catastrophic failure - https://www.rshq.qld.gov.au/safety-notices/mines/electric-motor-terminal-cover-catastrophic-failure) is correct as of time of printing (6 Dec 2021 7:23 pm).