Cryogenic Storage & LNG Equipment worked example

Vacuum Jacket Leak Rate at 68% maximum acceptable jacket leak rate: a worked example

Suppose maximum acceptable jacket leak 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 the leak or failure rate for vacuum-jacketed pipe, valves, hoses, or vessel jackets from failed items versus inspected population.

The inputs for this scenario

  • Vacuum-jacketed components failing check: 8 components (held at the documented default)
  • Total vacuum-jacketed components inspected: 250 components (held at the documented default)
  • Maximum acceptable jacket leak rate: 68 % (the input this scenario stresses; the baseline uses 95)

Working through the calculation

  • The calculation starts from the formula this tool documents: Vacuum jacket leak rate = components failing vacuum check ÷ total components inspected × 100.
  • Vacuum jacket leak rate works out to 3.2 % leaking at these inputs, and this is the headline figure for the scenario.
  • Leak rate above limit works out to 64.8 points at these inputs.
  • Components failing vacuum check works out to 8 count at these inputs.
  • Components inspected works out to 250 count at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where maximum acceptable jacket leak rate sits at 95% and the headline result is 3.2 % leaking, this scenario lands almost exactly on the baseline at 3.2 % leaking.
  • It computes the share of inspected vacuum-jacketed components that failed their vacuum check, expressed as a percent, and the gap between that rate and your maximum acceptable rate. 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

  • Vacuum jacket leak rate: 3.2 % leaking (headline result)
  • Leak rate above limit: 64.8 points
  • Components failing vacuum check: 8 count
  • Components inspected: 250 count

Run it with your numbers

  • To rerun this with your own numbers, open the live Vacuum Jacket Leak Rate calculator, set maximum acceptable jacket leak rate to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.