A Study on Electrostatic Hazards during Handling Volatile Organic Solvents

DOI Web Site
  • Endo Yuta
    National Institute of Occupational Safety and Health, Japan, Electrical Safety Research Group
  • Yamaguma Mizuki
    National Institute of Occupational Safety and Health, Japan, Electrical Safety Research Group

Bibliographic Information

Other Title
  • <b>有機溶剤の取扱いにおける静電気危険性に関する研究 </b>
  • 有機溶剤の取扱いにおける静電気危険性に関する研究 : ボールバルブからの液体小分け時の電荷量測定および電荷軽減策の検討
  • ユウキ ヨウザイ ノ トリアツカイ ニ オケル セイデンキ キケンセイ ニ カンスル ケンキュウ : ボールバルブ カラ ノ エキタイ コワケ ジ ノ デンカリョウ ソクテイ オヨビ デンカ ケイゲンサク ノ ケントウ
  • - Measurements of Electric Charge of pouring Liquid Through Ball-Valve and Mitigation Electric Charge
  • <b>―ボールバルブからの液体小分け時の電荷量測定および電荷軽減策の検討</b><b>― </b>

Search this article

Description

<p>A lot of fires and explosions due to electrostatic discharges in chemical plants have been reported, while a flammable volatile organic solvent is being dispensed into a container through a hose with a valve system. In our study, based on past accident cases, an experimental apparatus consisting of a stainless steel hose and a ball-valve system was developed, and a series of experiment was carried out to investigate static charge generation characteristics of liquids, including ethyl acetate, acetone, methanol, toluene, etc. In addition, countermeasures to mitigate static charge were suggested. Static charges of the liquid samples were found to be produced dominantly by electrification mechanism by spraying at the valve system, and it was recognized that there was a clear correlation between static charge and the conductivity of liquid, with the peak at around 10-8 S/m. In the case of ethyl acetate, with the conductivity of 1.8 × 10-8 S/m, extremely high static charges were observed that reached a level causing ignition of the vapor of ethyl acetate very shortly（within one second）or with a small amount （lessthan100g）.Finally, it is found that, by attaching a hose joint with small bore to the outlet of the ball-valve system and the valve element being completely soaked in the liquid, the static charge can be reduced to safe level.</p>

Journal

Keywords

Details 詳細情報について

Report a problem

Back to top