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ness of each layer, the volume of each layer can be
calculated.
Figure 2.4: The formation of various layers of different
materials in oil storage tank.
This figure illustrates the real organization of vapor,
organic, water and sludge in stroge tank in the refinery
plan. The vapor is in the form of partially gas therefore
it is the most lighter one as compared with organic and
water. Since it is in a gas form, the content of hydrocar-
bon also small so that scattered less neutron as shown
by low neutron count. Hence, it settle at the top most
part of the storage tank. There is a border in between
materials creates a step in neutron count. High signal
profile shows that more neutrons have been scattered
which indicates the materials have more concentration
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