Which of the following is not an acceptable...

🔍 Key Concepts

• Oil Record Book (ORB) entries must use one single, consistent unit for all quantities recorded • Typical cargo and fuel volume units used in shipping (e.g., m³, barrels, gallons) vs mass units (e.g., tons/tonnes) • How Annex I / ORB instructions distinguish between volume and mass when recording oil and oily mixtures

💭 Think About

• First, group the choices into volume units and weight (mass) units. Which ones clearly measure volume, and which measure weight? • Ask yourself: when you open tank soundings and calculate quantities of oil or oily mixtures, what unit do most ORB instructions expect you to use: volume or mass? • Consider which unit, if mixed with others, would make it harder to compare entries or check the ship’s oil quantities over time.

✅ Before You Answer

• Identify which options are pure volume units and which is commonly treated as a weight unit in shipboard records • Recall that the ORB requires you to stick to one type of unit throughout – would mixing volume and weight make sense for those entries? • Verify in current MARPOL/ORB guidance whether quantities are normally recorded as cubic meters (m³) or another volume-based unit, not in mass.

Which of the following is not an acceptable unit of measure to be used consistently throughout an Oil Record Book?

Cubic meters

Gallons

Barrels

Tons

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🔍 Key Concepts

💭 Think About

✅ Before You Answer