FROM CHARGE BUILD-UP TO DISSIPATION
THE TRIBOELECTRIC EFFECT
The body with the most electronegativity strips electrons from the other, generating a build-up of net negative charge on itself. The other body is charged by the same amount but with the opposite sign, giving rise to very high potential differences. These, if not dissipated, can give rise to electrostatic discharges.
Here are several methods to dissipate charge. One is charge relaxation, in which the pipes and specific other parts of equipment are made conductive. The charge build up then flows away along defined path ways in the equipment.