A Study on the Cause of the Fire in a Crude-oil Tank During Cleaning

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  • <b>原油タンク清掃時の火災原因に関する一考察</b>
  • 原油タンク清掃時の火災原因に関する一考察--絶縁性被覆を有する清掃用具の静電気帯電危険性
  • ゲンユ タンク セイソウジ ノ カサイ ゲンイン ニ カンスル イチ コウサツ ゼツエンセイ ヒフク オ ユウスル セイソウ ヨウグ ノ セイデンキ タイデン キケンセイ
  • <b>－絶縁性被覆を有する清掃用具の静電気帯電危険性－ </b>
  • Featuring Electrostatic Hazards Associated with Cleaning Tools Having a Nonconductive Cover

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Abstract

<p>A study was carried out to find the cause of a fire occurred in a large crude-oil tank in which five workers were killed and two injured. The fire started when the workers were scraping, using wipers having a nonconductive cover, crude oil sludge accumulated on the tank floor. In our investigative experiments, we focused on the electrostatic charge on the wipers. While scraping, a large amount of static charge was generated by the contact between the glove of the operator and the cover of the wiper, and when the operator released the wiper, the electrostatic potential of the wiper rapidly increased by electrostatic induction. When the cover was contaminated with the sludge, the potential became much larger due to the high resistive layer of petroleum wax. It was experimentally confirmed that the ignition of crude oil was possible by a spark from a wiper that was electrified during the scraping of the tank floor.</p>

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