Which cleaning method is capable of generating electrostatic charges within a tank?

The correct answer, which indicates that both steam cleaning and water washing can generate electrostatic charges within a tank, is rooted in the physical processes involved in these cleaning methods.

When steam cleaning occurs, the high temperatures and pressure inherent in the steam can lead to the evaporation of liquid and subsequent condensation on surfaces. This rapid change in state can create friction and turbulence, which may result in the generation of electrostatic charges as particles in the steam or residues in the tank interact with each other and the surfaces.

Similarly, water washing, particularly when using high-pressure jets, can also create conditions conducive to electrostatic charge generation. The movement of water molecules, especially under pressure, can produce friction as they collide with surfaces and dislodge residues inside the tank. This friction can lead to a build-up of electrostatic charges.

Both methods involve the dynamics of liquid movement and temperature changes, leading to the creation of static electricity, particularly in environments where non-conductive materials or residues are present. Understanding this mechanism is crucial for ensuring safety during the cleaning process, as electrostatic discharges can pose significant hazards, especially within tanks that have previously contained flammable substances.