Charging during spraying of liquids – Investigation of practice-relevant processes for the cleaning of small and medium-sized containers

Project No. FF-FP 0417




The main objective of the project is to obtain reliable information on limit values for acceptable electrostatic charge processes during the spraying of liquids which are transferable to conditions in selected industrial applications. The following questions have to be answered in detail:

  • Under what conditions can dangerous charges be generated when cleaning small and medium-sized containers?
  • Which ignition hazards occur under which boundary conditions?
  • Which evaluation criteria and boundary conditions apply?

Furthermore, it should be noted that the scientific investigations and results provide a safety-related recommendation for practical use. This requires a scientifically correct safety assessment of the electrostatic ignition hazards. The following aspects have to be considered:

  • Can gas discharges occur in principle?
  • What is the ignition potential of the gas discharges?


In order to obtain reliable information on limit values for permissible electrostatic dissolution processes during liquid spraying, the essential influencing variables and boundary conditions must be identified. The experimental investigations will then mainly be carried out on model arrangements that simulate the critical conditions and allow the necessary parameter variations. Systematic parameter variation is used to determine limit values and worst-case conditions. For this purpose, the influential cleaning medium, cleaning pressure, container material and container size are considered. The results will then be validated on real containers in order to allow a wide field of application.

Last Update:



Financed by:
  • Deutsche Gesetzliche Unfallversicherung e. V. (DGUV)
Research institution(s):
  • Physikalisch-Technische Bundesanstalt (PTB)

-cross sectoral-

Type of hazard:

electrical hazards


prevention, plant safety, design of plants and procedures

Description, key words:

electrostatic charge processes, liquids