Your ship has loaded 6,000 barrels of gasoline, at a cargo temperature of 50°F, departing New Jersey bound for Florida. API gravity is 55°. The volume correction factor (VCF) is .0006. How many barrels would you expect to unload if the cargo temperature is 90°F at the discharge port?
• Thermal expansion of liquids – what happens to gasoline volume when temperature increases • How to use a Volume Correction Factor (VCF) expressed in barrels per degree Fahrenheit • The relationship between original volume, temperature change, and corrected volume
• First, determine how many degrees the temperature changes between loading and discharge; write that number down. • Think about whether the cargo volume should increase or decrease when the temperature rises, and whether you should add or subtract the correction from the original 6,000 barrels. • Use the VCF to calculate how many barrels change per degree, then scale that up for the total temperature change to find the adjusted volume.
• Confirm you are using the correct temperature difference (discharge minus loading temperature). • Verify that you multiply the VCF by both the temperature change and the original volume before adjusting the final figure. • Before choosing an answer, check that your result is reasonable: is it slightly higher or slightly lower than 6,000 barrels, based on the direction of temperature change?
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