Tanker OBQ Survey - volume to mass with VCF

Compute On-Board Quantity (OBQ) mass from observed tank volume, density at 15 degrees, and cargo temperature. ASTM 54B-style volume correction factor for any residue or wash present before loading.

TankerOBQ surveyASTM 54BISGOTT

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This calculator requires JavaScript to compute its result. The formula, symbols, and regulatory sources are shown in the Formula section below.

Formula, assumptions, and limits

\text{Op} = \text{OBQ survey}

Symbol	Meaning	Unit
$OBQ survey$	On-Board Quantity before loading

Source: OCIMF ISGOTT 6th Ed

In short

Compute On-Board Quantity mass from observed tank volume, density at 15 degrees, and cargo temperature. ASTM 54B-style VCF for crude, refined products, lubes.

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