Tank, Vessel & Pressure Equipment Fabrication worked example

Vessel Volume at 61% fill and transfer efficiency: a worked example

Here is what the math looks like when conditions slip. We hold every other input steady and drop fill and transfer efficiency to 61%, then walk the calculation through step by step. Vessel Volume sizing tells a fabricator how much actual internal volume a tank or pressure vessel needs once real-world transfer losses are folded in.

The inputs for this scenario

  • Vessel capacity to fill: 500 units (held at the documented default)
  • Fill volume per capacity unit: 0.08 units (held at the documented default)
  • Fill and transfer efficiency: 61 % (the input this scenario stresses; the baseline uses 85)

Working through the calculation

  • The calculation starts from the formula this tool documents: Required vessel volume = covered amount × use per unit ÷ transfer efficiency.
  • Required quantity works out to 65.57 gal at these inputs, and this is the headline figure for the scenario.
  • Theoretical amount works out to 40 gal at these inputs.
  • Loss allowance works out to 25.57 gal at these inputs.
  • Efficiency works out to 61 % at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where fill and transfer efficiency sits at 85% and the headline result is 47.06 gal, this scenario comes in 39.34% above the baseline at 65.57 gal.
  • The practical read: the gap between this scenario and the baseline is entirely attributable to fill and transfer efficiency, so recovering it is worth quantifying in dollars before considering equipment or staffing changes. It sizes to a single steady-state fill condition and does not account for thermal expansion, foaming, agitation vortex, or code-mandated freeboard, which may require additional volume.

Results at a glance

  • Required quantity: 65.57 gal (headline result)
  • Theoretical amount: 40 gal
  • Loss allowance: 25.57 gal
  • Efficiency: 61 %

Run it with your numbers

  • To rerun this with your own numbers, open the live Vessel Volume calculator, set fill and transfer efficiency to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.