Mixing, Blending & Industrial Batch Processing worked example

Changeover Cleaning Time at 18% cip allowance: a worked example in mixing, blending & industrial batch processing

Suppose cip allowance falls to 18%. This page works the full calculation at that level so you can see exactly which result moves and by how much. Estimate changeover cleaning time from wetted surface area, crew clean rate, and a CIP allowance for charge, drain, and verification steps.

The inputs for this scenario

  • Wetted surface to clean: 350 sq ft (held at the documented default)
  • Crew clean rate: 120 sq ft / hr (held at the documented default)
  • CIP allowance: 18 % (the input this scenario stresses; the baseline uses 25)

Working through the calculation

  • The calculation starts from the formula this tool documents: Base clean time = wetted surface รท crew clean rate.
  • Adjusted run time works out to 3.44 hr at these inputs, and this is the headline figure for the scenario.
  • Base run time works out to 2.92 hr at these inputs.
  • Allowance applied works out to 18 % at these inputs.
  • Process rate works out to 120 pieces / min at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where cip allowance sits at 25% and the headline result is 3.65 hr, this scenario comes in 5.6% below the baseline at 3.44 hr.
  • It computes total changeover cleaning hours from wetted surface area divided by crew clean rate, then inflates that base time by a clean-in-place (CIP) allowance. 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

  • Adjusted run time: 3.44 hr (headline result)
  • Base run time: 2.92 hr
  • Allowance applied: 18 %
  • Process rate: 120 pieces / min

Run it with your numbers

  • To rerun this with your own numbers, open the live Changeover Cleaning Time calculator, set cip allowance to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.