Geothermal Loop Purge and Antifreeze Commissioning Inspection

Commissioning inspection record for closed-loop ground source heat exchanger systems, documenting purge performance, debris removal, antifreeze concentration, pressure test results, and final loop readiness before connection to the building system.

Inspection Details

• Project / site name
• Loop system identifier
  Identify the ground loop, header, or manifold being inspected.
• Inspection date and time
• Inspector name and company
• Commissioning phase

Circuit Purge and Flushing Verification

• All circuits purged individually or in verified groups
• Minimum flushing velocity achieved for each circuit
  Record the measured flushing velocity for the slowest circuit and confirm it meets the project specification or manufacturer requirement.
• Number of circuits verified
• Air removed from loop
• Debris collected during purge
  Describe visible debris, sediment, pipe shavings, or other contaminants removed from the loop.
• Strainer or filter cleaned during purge

Antifreeze Mix Verification

• Antifreeze type
• Measured antifreeze concentration
  Enter the measured concentration by refractometer, hydrometer, or approved test method.
• Freeze protection verified against design minimum temperature
• Antifreeze solution mixed uniformly
• Test method used for concentration

Pressure, Flow, and Leak Check

• Loop pressure at completion
  Record the final stabilized loop pressure after purge and fill.
• Pressure test held for required duration
• No visible leaks at piping, fittings, valves, or headers
• Pressure drop observed during hold
  If applicable, record the measured pressure loss during the hold period.

Final Readiness and Sign-Off

• Loop flushed, filled, and ready for connection
• Outstanding deficiencies or non-conformances
  List any unresolved items, corrective actions, or follow-up requirements.
• Corrective action assigned
• Inspector signature