STATIC ELECTRICITYBY

S.ABIAH VIJAYRAJ

DEFINITION The build-up of electric chargeon thesurface

of dissimilar objects. The staticcharges remain on an object until

theyeither bleed off toground or are quicklyneutralized by a discharge

STATIC ELECTRICITY

Materials are generally neutrally charged ± equal number of electrons and protons.

 However, some materials when rubbed/moved, have a tendency to loose electrons quite easily.

They then develop a positive charge and the surface they are rubbed on develop a negative charge.

 When any positive / negatively charged material is brought close to a `neutral’ or ` opposite’ charged surface, there can be a discharge ( due to the difference in potential between both surfaces)causing the phenomenon of static electricity.

How is it created?

To be discussed during this lecture: OIL MOVING THROUGH PIPELINES STATIC GENERATION DUE TO SPLASHING

ANDSPRAYING

SOURCES OF STATIC ELECTRICITY ON SHIP

1.Oil moving through a pipeline : frictional resistance near the pipe

wall and smooth movement near the central axis of pipe.

2.This disturbed movement, along with impurities in oil causes separation of molecules.

3.Stationary Oil droplet ± no charge.

OIL MOVING THROUGH PIPELINES

The molecules then break up into charged particles, as displayed . Electrons break free and accumulate as negative charge on the sides of the pipe and positively charged oil particles start accumulating within the tank.

Once, the flow increases, build up of electron within the pipe accumulates.

Eventually the excessive negative charge built up within the pipeline can be scooped an delivered into the tank where positively charged oil already awaits-this can cause a static electricity discharge.

Positively charged oil moving through pipeline: - ve ions left behind in pipe.

OIL MOVING THROUGH PIPELINES.(Contd.)

Thank You