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Shore Tank Gauging Errors

Jose Ramon Rodriguez Serpa
Jose Ramon Rodriguez Serpa

The document discusses the hidden costs of temperature measurement errors when measuring cargo quantities during transfers. It notes that an error of just 1.6属C/3属F can lead to a difference of 180 barrels in a 150,000 barrel tank, potentially impacting the value of a gasoline cargo by around $19,440. However, 90% of portable electronic thermometers used for these measurements are not properly verified per industry standards, meaning the reported temperatures may have undetected biases. The document concludes that specialists should be consulted to properly determine cargo tank temperatures and avoid these measurement errors.

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The hidden Cost of Temperature Measurement Errors www.marinecargoadvisors.com TECHNICAL BULLETIN As detailed in the above table, one of the most relevant factor that can impact the shore quantities is the Temperature Reading, (0.12%) where each 1.6属C (3属F) means 180 Bbls in a 150 K BBLS tank. (360 Bbls for a standard 300 K Bbls Shipment, potential impact on the value of a gasoline cargo by approximately 19,440 USD) FACT: 90% of Portable Electronic Thermometer (PET) used in the Cargo Transfer measurement doesn卒t comply with the API-MPMS Chapter 7 Section 8.2.1 & 8.2.2 related to the field and monthly verification of the Thermometer. In other words, you can be reading the temperatures correctly using a device with results bias in the measurement due to lack of verification. We are specialist on the correct determination of the Shore Tank Temperature +/- 0.60 +/- 225 +/- 0.15% + 0.25 + 90 + 0.06% +/- 0.25 +/- 90 +/- 0.06% + 1.50 + 525 + 0.35% +/- 0.50 +/- 180 +/- 0.12% +/- 0.12 +/- 45 +/- 0.03% +/- 0.15 +/- 60 +/- 0.04% +/- 0.12 +/- 45 +/- 0.03% + 3.49 + 1,260 + 0.84% High + 2.68 + 1,005 + 0.67% Low + 1.08 + 405 + 0.27% Error in temperature Reading (03属F / 1.6属C) Barrels Inches Percent Tank Table Errors Error Bottom Movement Shell Diameter Thermal Expansion Datum Plate Upward Movement IMPACT OF TYPICAL MANUAL INNAGE GAUGE ERRORS ON A: 150,000 BBls TANK Tape Calibration Tape Thermal Expansion Human Errors - Level Reading Total (If all errors positive) Statistical Error Range

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Shore Tank Gauging Errors

  • 1. The hidden Cost of Temperature Measurement Errors www.marinecargoadvisors.com TECHNICAL BULLETIN As detailed in the above table, one of the most relevant factor that can impact the shore quantities is the Temperature Reading, (0.12%) where each 1.6属C (3属F) means 180 Bbls in a 150 K BBLS tank. (360 Bbls for a standard 300 K Bbls Shipment, potential impact on the value of a gasoline cargo by approximately 19,440 USD) FACT: 90% of Portable Electronic Thermometer (PET) used in the Cargo Transfer measurement doesn卒t comply with the API-MPMS Chapter 7 Section 8.2.1 & 8.2.2 related to the field and monthly verification of the Thermometer. In other words, you can be reading the temperatures correctly using a device with results bias in the measurement due to lack of verification. We are specialist on the correct determination of the Shore Tank Temperature +/- 0.60 +/- 225 +/- 0.15% + 0.25 + 90 + 0.06% +/- 0.25 +/- 90 +/- 0.06% + 1.50 + 525 + 0.35% +/- 0.50 +/- 180 +/- 0.12% +/- 0.12 +/- 45 +/- 0.03% +/- 0.15 +/- 60 +/- 0.04% +/- 0.12 +/- 45 +/- 0.03% + 3.49 + 1,260 + 0.84% High + 2.68 + 1,005 + 0.67% Low + 1.08 + 405 + 0.27% Error in temperature Reading (03属F / 1.6属C) Barrels Inches Percent Tank Table Errors Error Bottom Movement Shell Diameter Thermal Expansion Datum Plate Upward Movement IMPACT OF TYPICAL MANUAL INNAGE GAUGE ERRORS ON A: 150,000 BBls TANK Tape Calibration Tape Thermal Expansion Human Errors - Level Reading Total (If all errors positive) Statistical Error Range