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Demystifying the Crude Oil Tank Strapping Chart: A Guide to Accurate Inventory Measurement

Updated: May 23

In the fast-paced world of oil and gas, precise measurement is paramount. For facilities storing crude oil, a crucial tool for ensuring accuracy is the crude oil tank strapping chart. This seemingly simple document plays a vital role in managing inventory, preventing financial losses, and maintaining regulatory compliance.

What is a Crude Oil Tank Strapping Chart? Imagine a large storage tank filled with crude oil. Dipping a measuring stick in wouldn't tell you the exact volume. This is where the tank strapping chart comes in. It's a custom-made table that translates a linear measurement (like the depth of oil in the tank) into the actual volume of crude oil stored.

Why are Tank Strapping Charts Important? Here's why every facility dealing with crude oil storage needs a precise tank strapping chart:

  • Accurate Inventory Management: Knowing the exact volume of oil allows for efficient inventory control. Without a proper chart, overestimating or underestimating inventory can lead to financial losses.

  • Enhanced Profitability: Accurate measurements ensure you're billed correctly for received and delivered oil. Discrepancies can significantly impact your bottom line.

  • Regulatory Compliance: Many regulations mandate periodic tank calibration and the use of strapping charts for accurate oil volume reporting.

  • Safety Measures: Precise volume knowledge helps prevent overfilling, a safety hazard that can lead to spills and environmental damage.

How is a Crude Oil Tank Strapping Chart Created?

Creating a tank strapping chart involves a meticulous process:

  • Tank Geometry: The tank's size and shape are precisely measured to understand its volume characteristics.

  • Strapping Chart Development: The calibration data is used to generate a table that translates depth measurements into accurate oil volumes. This table becomes the crucial tank strapping chart.

Benefits of Using a Crude Oil Tank Strapping Chart:

  • Improved Inventory Control: Accurate volume measurements for better decision-making.

  • Reduced Financial Losses: Eliminates discrepancies in billing and receiving.

  • Regulatory Compliance: Ensures adherence to industry standards and regulations.

Maintaining Your Crude Oil Tank Strapping Chart: Tank strapping charts are not static documents. Over time, tanks can settle or be modified, so it's crucial to:

  • Schedule Periodic Recalibration: Regularly recalibrate your tanks to account for any changes and ensure the chart's accuracy. API 2.2A, Annex A.2.6 - Tank Calibration/ Frequency of Recomputation of Calibration Tables, recommends a volume shift calculation for determining the Calibration Interval for tanks.  This applies to tanks used for Custody Transfer measurement or as the Primary backup measurement to another custody transfer measurement system

  • Proper Chart Storage: Store the chart in a secure and easily accessible location for reference during oil measurement procedures.


A crude oil tank strapping chart is an essential tool for facilities managing crude oil inventory. By ensuring accurate volume measurement, it empowers businesses to optimize operations, maintain financial control, comply with regulations, and prioritize safety. Investing in a proper tank strapping chart is an investment in the smooth and successful operation of your crude oil storage facility.

To Learn more about how Gauge Point Calibration can assist you with a Tanks Strapping Chart, please contact us today!

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