District Energy & Thermal Network Equipment worked example

Commissioning Hours at 7.2% flush, balance, and punch-list allowance: a worked example in district energy & thermal network equipment

This worked example runs the commissioning hours numbers for a tougher week than the baseline: 7.2% flush, balance, and punch-list allowance instead of the typical 10%. Estimate commissioning labor for district energy plants, distribution loops, ETS skids, pump stations, meters, controls, flushing, balancing, and performance testing.

The inputs for this scenario

  • Commissioning work packages: 120 packages (held at the documented default)
  • Commissioning completion pace: 12 packages / hr (held at the documented default)
  • Flush, balance, and punch-list 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 = commissioning work packages รท commissioning completion pace.
  • 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.
  • Flush, balance, and punch-list allowance works out to 7.2 % at these inputs.
  • Commissioning completion pace works out to 12 pieces / min at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where flush, balance, and punch-list 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 during the construction-to-operations handoff when scheduling commissioning crews, building the Cx timeline, or validating a substantial-completion date for a district heating or cooling 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
  • Flush, balance, and punch-list allowance: 7.2 %
  • Commissioning completion pace: 12 pieces / min

Run it with your numbers

  • To rerun this with your own numbers, open the live Commissioning Hours calculator, set flush, balance, and punch-list allowance to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.