Cryogenic Storage & LNG Equipment worked example

Cryogenic Maintenance Interval Workload at 12% isolation, purge, and restart allowance: a worked example

What does the result look like when isolation, purge, and restart allowance reaches 12%? The full calculation is worked below with real intermediate numbers. Use it when cryogenic maintenance interval workload in cryogenic storage and lng equipment needs a defensible run time before a quote goes out.

The inputs for this scenario

  • Cryogenic maintenance tasks due this interval: 120 tasks (unchanged)
  • Technician task completion rate: 12 tasks / hr (unchanged)
  • Isolation, purge, and restart allowance: 12 % (raised for this scenario; the documented default is 10)

Working through the calculation

  • Applying the documented formula (Base maintenance labor = cryogenic maintenance tasks due รท maintenance task completion rate) to the inputs above produces each figure below.
  • At this operating point the engine returns 11.2 hr for required maintenance interval labor, the number this scenario is built around.
  • At this operating point the engine returns 10 hr for base maintenance labor.
  • At this operating point the engine returns 12 % for cryogenic service allowance.
  • At this operating point the engine returns 12 pieces / min for maintenance task completion rate.

How this compares with the baseline

  • Against the tool's baseline example, where isolation, purge, and restart allowance sits at 10% and the headline result is 11 hr, this scenario comes in 1.82% above the baseline at 11.2 hr.
  • A figure at this level is achievable when isolation, purge, and restart allowance is genuinely sustained, not just peaked for a shift. It assumes a single average completion rate and one blanket allowance; a mix of quick PMs and major valve overhauls will need separate runs to stay accurate.

Results at a glance

  • Required maintenance interval labor: 11.2 hr (headline result)
  • Base maintenance labor: 10 hr
  • Cryogenic service allowance: 12 %
  • Maintenance task completion rate: 12 pieces / min

Run it with your numbers

  • Every input above is editable in the live Cryogenic Maintenance Interval Workload calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.