Spraying water under high pressure generates charge-separating processes. While cleaning tanks and vessels in which an explosive atmosphere is present, an explosion may occur in the event of a resulting discharge. Water forms electrical double layers at the phase boundaries. Mechanical separation processes dissolve the water into many drops. This leads to charge separation and the charging of the sprayed water. The mechanical separation processes include water exiting from the nozzle, hydrodynamic instability in the jet and impact with an obstacle. Given that water has many charge carriers, the charge is stronger than with solvents. Whether the charges and the resulting discharges are potentially capable of igniting an explosive atmosphere must be investigated. The aim of this research is to define the quantity and polarity of the electrostatic charges of sprayed water under high pressure. Different measurement techniques and methods are used to enable mutual validation and to generate verified measurement results of the electric field and the potential. Water of different electrical conductivity is sprayed in free space and into a grounded conductive 1 m³ vessel. Design changes to the vessel allow centric or oblique spraying. The result is intended to extend the scope of application of the German regulation TRGS 727 and the international IEC TS 60079-32-1, which refer to ignition hazards due to electrostatic charging. This project is funded by the DGUV (German Social Accident Insurance) and partners from industry.

在高压下喷水会产生电荷分离过程。在清洗有爆炸性气氛的储罐和容器时，如果将其排放，可能会发生爆炸。水在相边界处形成双电层。机械分离过程将水溶解成许多滴。这导致电荷分离和喷射水的带电。机械分离过程包括从喷嘴流出的水，射流中的流体动力不稳定性以及有障碍物的撞击。鉴于水具有许多电荷载流子，因此电荷比溶剂强。必须研究装料及其产生的放电是否有可能点燃爆炸性气氛。这项研究的目的是确定高压下喷水的静电电荷的数量和极性。使用不同的测量技术和方法可以进行相互验证，并生成经过验证的电场和电势测量结果。将具有不同电导率的水喷洒到自由空间中，并喷入接地的导体1 m中³艘船。容器的设计更改允许进行中心喷涂或倾斜喷涂。该结果旨在扩大德国法规TRGS 727和国际IEC TS 60079-32-1的适用范围，它们涉及由于静电引起的着火危险。该项目由DGUV（德国社会事故保险）和行业合作伙伴资助。