钻机触点台面电力线后发出的安全警报


2022年1月28日,星期五

钻机触点台面电力线后发出的安全警报

勘探钻机联系活力22千伏overhead power lines while travelling across a paddock; one of the three overhead power lines was broken and dropped to the ground. The operator dismounted the rig without suffering any injuries or electric shocks. The incident occurred on Sunday, 20 September 2020, at an exploration site in central western New South Wales. The drill, a Schramm 685 rubber tyre truck mounted rig, had just completed drilling an exploration hole and was being moved to set up on the next hole. The operator lowered the mast, however the rod handling jib remained raised. As the drill rig passed under the 22 kV overhead powerline the raised jib contacted the energised conductors.

最初的调查表明,未能遵循程序并降低凸起的速度,使钻机可以与22 kV电源线接触,将第一行拖到与第二行的接触中,导致高压故障,随后绊倒了电源并引起了电源排在地上。操作员卸下了钻机,以为轮胎已经吹了,没有意识到杆处理臂撞了电线。

The incident was reported to the NSW Resources Regulator as a dangerous incident; the Regulator issued a prohibition notice requiring the operator to establish a 24-hour exclusion zone around the drill rig to minimise risks to workers and other persons in the event of one or more tyres exploding. Previous incidents have shown that brief contact with power lines can cause one or more truck tyres to explode immediately, or hours after the event. The heat generated in the tyre creates an explosive gas which can ignite.

资源监管机构指出,虽然偏远地区的工作活动可能对可用风险控制措施构成其他危害和限制,但这并不能证明无法控制风险。监管机构建议,无论活动的频率或复杂性如何,风险评估应考虑与高架电力线附近可能发生的所有活动相关的风险。风险评估还应确定所有控制措施,以防止设备侵占高压架空电源线的安全距离距离,包括替代旅行路线或工作地点;对于任何可能在高架电源线附近行驶或工作的设备的最大高度限制;以及警告标牌或壁垒(临时或永久性),用于间接费用线(包括安全高度限制)。

还建议运营商使用计划任务支持的程序,清单和许可证,以验证其在管理风险方面的实施和有效性。应建立紧急程序,并包括电源控制器的联系方式。运营商还应熟悉新南威尔士州实践守则中提供的指导Work near overhead power lines

Image credit: ©stock.adobe.com/au/rocketclips

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