A tanker is loaded with 8,000 barrels of fuel oil. The temperature of the cargo is 50° F. API gravity is 37°. The volume correction factor (VCF) is .0005. What is the net amount in barrels of cargo loaded?
• Temperature correction of liquid volumes relative to a 60°F standard • How volume correction factor (VCF) is applied when temperature is below the standard reference temperature • Relationship between observed volume, correction per degree, and net (standard) volume
• First decide: is 50°F colder or warmer than the usual 60°F reference, and does a colder liquid occupy more or less volume? • Think about whether you should be adding to or subtracting from the observed 8,000 barrels to reach the standard volume at 60°F. • Use the given VCF as a change in volume per degree: how many degrees difference from 60°F, and what fraction of 8,000 barrels does that represent?
• Confirm the reference temperature you are correcting to (usually 60°F for petroleum products). • Compute the temperature difference: |50°F − 60°F| and multiply it by the VCF to find the total fractional change. • Apply that fractional change correctly to 8,000 barrels (either increase or decrease, based on the temperature direction) before comparing to the choices.
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