(2) Greases.
Manufactured by compounding petroleum and synthetic oils with metallic soaps.
Used in places where lubricating oil will not remain because of "run off" tendency.
e. Specialty Items.
Solvents.
Hydraulic fluids.
Cutting and insulating oils.
Antifreeze fluids.
Coolant.
Protective compounds.
6.
PetroleumRelated Calculations.
a. Specific Gravity.
(1) The ratio of the weight of 1 gallon of fuel to the weight of 1 gallon of distilled water at a
temperature of 60 degrees Fahrenheit.
(2) The weight of 1 gallon of water is 8.33 pounds.
(3) The specific gravity of water is 1.0000
8.33 = 1.0000
8.33
(4) The weight of 1 gallon of MOGAS is 6.20 pounds.
The specific gravity of MOGAS is
6.20 = 0.7443
8.33
b. Definition of API Gravity:
(1) An arbitrary scale developed by the American Petroleum Institute to measure the specific gravity
of liquid petroleum products at a temperature of 60ƒF. The scale was developed to eliminate the problem of
working with decimals associated with specific gravity.
(2) Water has an API of 10.0. As the API goes up, its corresponding specific gravity goes down (an
inverse relationship).
(3) Correction of API to 60 degrees Fahrenheit.
(a) Round tenths place of the API reading as follows:

.1, .2 down to .0

.3,.4,.6,.7 to .5

.8,.9 up to next .0
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