Cryogenic Storage & LNG Equipment worked example

Tank Boil-Off Rate at 68% target maximum boil-off rate: a worked example

Suppose target maximum boil-off rate falls to 68%. This page works the full calculation at that level so you can see exactly which result moves and by how much. Calculate cryogenic tank boil-off as a percent of starting liquid inventory so operators can judge holding performance, vent loss, and refill risk.

The inputs for this scenario

  • Boil-off or vented liquid equivalent: 8 gal (held at the documented default)
  • Starting usable liquid inventory: 250 gal (held at the documented default)
  • Target maximum boil-off rate: 68 % per period (the input this scenario stresses; the baseline uses 95)

Working through the calculation

  • The calculation starts from the formula this tool documents: Tank boil-off rate = boil-off or vented liquid equivalent ÷ starting usable liquid inventory × 100.
  • Measured tank boil-off rate works out to 3.2 % per period at these inputs, and this is the headline figure for the scenario.
  • Boil-off above target works out to 64.8 points at these inputs.
  • Boil-off liquid equivalent works out to 8 count at these inputs.
  • Starting usable liquid inventory works out to 250 count at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where target maximum boil-off rate sits at 95% and the headline result is 3.2 % per period, this scenario lands almost exactly on the baseline at 3.2 % per period.
  • It computes boil-off rate as vented liquid equivalent divided by starting inventory, times 100, and compares it against a target maximum. When the numbers land here, the stressed input is the lever to work; the walkthrough above shows exactly how much each output recovers as it climbs back toward the baseline.

Results at a glance

  • Measured tank boil-off rate: 3.2 % per period (headline result)
  • Boil-off above target: 64.8 points
  • Boil-off liquid equivalent: 8 count
  • Starting usable liquid inventory: 250 count

Run it with your numbers

  • To rerun this with your own numbers, open the live Tank Boil-Off Rate calculator, set target maximum boil-off rate to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.