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OIL TANKER
FAMILIARIZATION
COURSE.
INTRODUCTION TOSTATIC ELECTRICITY AND ITS
SOURCES:
A BRIEF DISCUSSION WITH
CAPT. VIRAF F. CHICHGAR
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STATIC ELECTRICITY - DEFINITION
Static electricity
The build-up of electric charge on the
surface of dissimilar objects. The staticcharges remain on an object until they
either bleed off to ground or are quickly
neutralized by a discharge.
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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 isbrought 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.
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+- -
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++- -
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- -
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SOURCES OF STATIC ELECTRICITY ON SHIP.
To be discussed during this lecture:
OIL MOVING THROUGH PIPELINES
STATIC GENERATION DUE TO SPLASHING AND
SPRAYING
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OIL MOVING THROUGH PIPELINES.
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.
Stationary Oil droplet no
charge.
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OIL MOVING THROUGH PIPELINES.
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.
+++++++VE - - - - - - -VE Positively charged oil movingthrough pipeline: -ve ions left
behind in pipe.
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WATCH THE CHARGES SEPERATE.
.
+++++++VE
- - - - - - -VE
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STATIC DUE TO SPLASHING/ SPRAYING
aa) Uncharged condition bb) Commencement of charge separation cc) Charged oil droplet
Tank
bulkhead Charge
developing
Charged
oil droplet
Tank
bulkhead
Tan
k
bulkhead
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STATIC DUE TO SPLASHING/ SPRAYING
aa) Uncharged condition bb) Commencement of charge separation cc) Charged oil droplet
Tank
bulkhead Charge
developing
Charged
oil droplet
Tank
bulkhead
Tan
k
bulkhead
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ANY QUESTIONS ?
THANK YOU FOR BEING ANATTENTIVE AUDIENCE.
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