(b) Turn trough ASTM Table 5B until you find observed API degrees across the top of the chart
and the observed temperature down the left side. Where the two intersect on the chart is the corrected API.
(c) Converting API and Specific Gravity.
d. Weight Problems.
(1) Petroleum handlers are required to convert pounds of fuel to gallons when involved in aircraft
refuel missions.
(2) Using the specific gravity of the fuel and the weight of water, we can convert pounds to gallons
and vice versa.
(3) To determine the weight of 1 gallon of fuel, multiply the weight of 1 gallon of water (8.33 lb.)
and the specific gravity of fuel.
(4) To convert pounds to gallons:
(a) Determine the weight of 1 gallon of fuel.
(b) Divide the weight of the fuel by the weight of 1 gallon of fuel.
(5) To convert pounds to gallons:
(a) Determine the weight of 1 gallon of fuel.
(b) Multiply the gallons of fuel by the weight of 1 gallon of fuel.
Example: Convert 325 pounds of JP-4 to gallons (47.9 API at 60 degrees F)
Solution:
Step 1. Determine SG at 60 degrees F
QM5200
22-8
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