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Mechanical Engineering3D

Storage Capacity Calculator

Calculate liquid storage capacity for multiple tanks or vessels, with days-of-supply estimation.

Inputs
Enter your values below

0.85-0.95 typical (allow ullage)

100m³ tank ÷ 0.1m³/h×24h = ~37 days

Result
Days of Supply
—
Enter values and click Calculate
Formula
volume × fill ÷ (consumption × 3600 × 24)
Result unit: days

Days = (Volume × FillFactor) / (Consumption × 86400). Volume in m³, consumption in m³/s (×3600×24 to m³/day).

Introduction

Calculate how many days of supply a tank farm provides given total storage volume, a fill factor (ullage), and process consumption rate. API standards typically recommend 7-30 days buffer for raw materials.

How This Calculator Works

Days = (Volume × FillFactor) / (Consumption × 86400). Volume in m³, consumption in m³/s (×3600×24 to m³/day).

Step-by-step process:

  1. Enter your input values in the calculator above
  2. The engine converts all inputs to SI base units (meters, kg, Pa)
  3. The formula is evaluated: volume * fill / (consumption * 3600 * 24)
  4. Result is formatted with the appropriate unit and precision

Calculation Example

100,000 L at 90% fill = 90 m³ usable. At 0.375 m³/h consumption (9 m³/day): 37.5 days of supply.

Inputs: volume=100000, fill=0.9, consumption=0.1
Result: 37.5 days

Unit Conversion for Storage Capacity

**Volume units**

- 1 m³ = 1000 L = 264.17 US gal = 6.2898 US bbl

- 1 US bbl = 42 US gal = 0.159 m³

- 1 imp gal = 4.546 L

**Length units**

- 1 m = 3.28084 ft

Storage capacity planning uses gross volume, fill factor, and net usable volume. Convert all dimensions to one consistent unit system before computing, then express the result in the required volume unit (m³, bbl, or gal).

Engineering Applications

  • •Tank farm sizing
  • •Supply chain planning
  • •Buffer stock calculation
  • •Process plant design

Frequently Asked Questions

What is a good fill factor?

Storage (m³) = daily consumption × 7 / fill factor. For 10 m³/h = 240 m³/day × 7 / 0.9 = 1,867 m³ needed.

How do I convert capacity between m³ and barrels?

1 m³ = 6.2898 US barrels (42 gal). For example, 100 m³ = 629 barrels. Use this factor for tank farm capacity planning in the oil and gas industry.

What is the difference between gross and net capacity?

Gross capacity is the full geometric volume of the tank. Net usable capacity subtracts dead volume (bottom sediment, heating coils, minimum pump-out level) and applies the fill factor, typically 85-95% of gross for working storage.

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Engineering Disclaimer: Calculations are for reference and educational purposes only. Always verify results independently for engineering design. See full disclaimer.
Reviewed by: Industrial Engineering Team
References: ASME B31.3, ASTM A36, Perry's Chemical Engineers' Handbook