Static Electricity on Oil Tankers

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<p>OIL TANKER FAMILIARIZATION COURSE.</p> <p>INTRODUCTION TO STATIC ELECTRICITY AND IT S SOURCES:</p> <p>STATIC ELECTRICITY - DEFINITION Static electricity The build-up of electric charge on the surface of dissimilar objects. The static charges remain on an object until they either bleed off to ground or are quickly neutralized by a discharge.</p> <p>STATIC ELECTRICITY How is it created? 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.</p> <p>+</p> <p>- +</p> <p>- + - +</p> <p>-</p> <p>+</p> <p>+ +</p> <p>-</p> <p>+ +</p> <p>-</p> <p>+</p> <p>-</p> <p>-</p> <p>+ + + + +</p> <p>- + - +</p> <p>-</p> <p>+</p> <p>+ +</p> <p>-</p> <p>SOURCES OF STATIC ELECTRICITY ON SHIP. To be discussed during this lecture: OIL MOVING THROUGH PIPELINES STATIC GENERATION DUE TO SPLASHING AND SPRAYING</p> <p>OIL MOVING THROUGH PIPELINES.Stationary Oil droplet no charge.</p> <p>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.</p> <p>OIL MOVING THROUGH PIPELINES.+++++++VE------VE</p> <p>Positively charged oil moving through pipeline: -ve ions left behind in pipe.</p> <p>1. The molecules then break up into charged particles, as displayed in the diag. above. Electrons break free and accumulate as negative charge on the sides of the pipe and positively charged oil particles start accumulating within the tank. 2. Once, the flow increases, build up of electron within the pipe accumulates. 3. 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.</p> <p>WATCH THE CHARGES SEPERATE.</p> <p>.</p> <p>+++++++VE------VE</p> <p>STATIC DUE TO SPLASHING/ SPRAYING</p> <p>Tank bulkhead</p> <p>Charge developing</p> <p>Tank bulkhead</p> <p>Charged oil droplet</p> <p>aa) Uncharged condition bb) Commencement of charge separation cc) Charged oil droplet</p> <p>Tank bulkhead</p> <p>STATIC DUE TO SPLASHING/ SPRAYING</p> <p>Tank bulkhead</p> <p>Charge developing</p> <p>Tank bulkhead</p> <p>Charged oil droplet</p> <p>aa) Uncharged condition bb) Commencement of charge separation cc) Charged oil droplet</p> <p>Tank bulkhead</p> <p>ANY QUESTIONS ?</p> <p>THANK YOU FOR BEING AN ATTENTIVE AUDIENCE.</p>