Cryogenic Storage & LNG Equipment worked example

Cryogenic Commissioning Hours at 7.2% startup hold, purge, and documentation allowance: a worked example

This worked example runs the cryogenic commissioning hours numbers for a tougher week than the baseline: 7.2% startup hold, purge, and documentation allowance instead of the typical 10%. Estimate commissioning hours for cryogenic storage, LNG transfer, vaporizer, pressure-control, and safety systems.

The inputs for this scenario

  • Cryogenic commissioning checklist tasks: 120 tasks (held at the documented default)
  • Crew task completion rate during cooldown: 12 tasks / hr (held at the documented default)
  • Startup hold, purge, and documentation allowance: 7.2 % (the input this scenario stresses; the baseline uses 10)

Working through the calculation

  • The calculation starts from the formula this tool documents: Base commissioning hours = cryogenic commissioning tasks รท commissioning completion rate.
  • Required commissioning hours works out to 10.72 hr at these inputs, and this is the headline figure for the scenario.
  • Base commissioning hours works out to 10 hr at these inputs.
  • Startup allowance applied works out to 7.2 % at these inputs.
  • Commissioning completion rate works out to 12 pieces / min at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where startup hold, purge, and documentation allowance sits at 10% and the headline result is 11 hr, this scenario comes in 2.55% below the baseline at 10.72 hr.
  • Use it when planning crew size and schedule for the cooldown and startup phase of a cryogenic vessel or LNG system. A result at this level usually justifies acting on the stressed input before touching anything else, because every other figure in the table is downstream of it.

Results at a glance

  • Required commissioning hours: 10.72 hr (headline result)
  • Base commissioning hours: 10 hr
  • Startup allowance applied: 7.2 %
  • Commissioning completion rate: 12 pieces / min

Run it with your numbers

  • To rerun this with your own numbers, open the live Cryogenic Commissioning Hours calculator, set startup hold, purge, and documentation allowance to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.