Oil Tank Volume Calculator
Calculate tank volume, capacity, ullage, and net standard volume with API 11.1 temperature correction. Includes strapping chart and standard tank presets.
Standard Tank Presets
Tank Parameters
V = (π/4) × D² × h / 5.615 (bbl)
Results
Gross Observed Volume
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Net Standard Volume
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Tank Capacity
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Ullage
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Fill %
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CTL Factor
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Specific Gravity
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bbl/ft
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Strapping Chart (Volume vs Height)
Strapping Table
| Height (ft) | Gross (bbl) | Net Std (bbl) | Gallons |
|---|
How this was calculated
Gross volume: V = (pi/4) * D^2 * h / 5.615, where D = diameter (ft), h = fluid level (ft), 5.615 = ft3 per barrel.
CTL (API 11.1): Temperature correction factor to correct volume from observed temperature to standard 60 deg F. CTL = exp(-alpha * deltaT * (1 + 0.8 * alpha * deltaT)), where alpha is the coefficient of thermal expansion for the crude oil.
Net standard volume: NSV = GOV * CTL. This is the volume at standard conditions (60 deg F).
API gravity to SG: SG = 141.5 / (API + 131.5).
Standard tank sizes: Nominal capacities; actual dimensions vary by manufacturer.
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Accurate tank gauging is fundamental to oil production measurement and custody transfer. The gross observed volume (GOV) of a vertical cylindrical tank is calculated from the tank diameter and the measured fluid level. For standard oilfield tanks, volume is expressed in barrels (1 barrel = 5.615 cubic feet = 42 US gallons).
A strapping table (or tank table) maps fluid height to volume at regular intervals, allowing field personnel to quickly convert a gauge reading to barrels. For vertical cylindrical tanks, the relationship is linear, with each foot of height corresponding to a fixed number of barrels determined by the tank diameter.
Temperature correction per API MPMS Chapter 11.1 (formerly API 2540 / ASTM D1250) adjusts the observed volume to standard conditions at 60 deg F. The correction factor (CTL) depends on the API gravity of the crude and the temperature difference from 60 deg F. Lighter crudes (higher API gravity) expand more per degree of temperature change.
Standard oilfield tank sizes (100, 210, 300, 500, 750, and 1,000 barrel nominal capacity) are manufactured to approximate dimensions. Actual volumes should be verified against manufacturer strapping tables or physical calibration.
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