A Newcomer's Guide to Oil and Gas: A 'SAFE' Matrix

A Newcomer's Guide to Oil and Gas: A 'SAFE' Matrix
Find out more about a key offshore reference and an important inverse relationship.

As EngineeringToolBox.com shows, dividing 141.5 by the specific gravity of a crude oil (at 60 degrees Fahrenheit) and then subtracting 131.5 from the quotient gives you the API gravity:

               API gravity = (141.5/specific gravity at 60˚F) – 131.5

To calculate the specific gravity of crude oil, simply add 131.5 to the crude's API gravity and divide the sum into 141.5:

               Crude oil specific gravity = 141.5/(API gravity + 131.5)

"You can calculate API gravity from specific gravity, and vice versa," said Stevenson. "Most petroleum liquids have an API gravity between 10˚ and 70˚."

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