The Vital Role of Leak Check after Pressure Testing

Refrigeration system integrity depends on leak-free connections throughout the piping network. The leak check performed after pressure testing is not a formality — it is a critical quality assurance step that protects system performance, refrigerant charge, and ultimately food safety. Dynamiq’s project at Bravo Tampa demonstrates the importance of this process in commercial refrigeration installation.

Why Leak Checks Matter

Refrigerant leaks have multiple negative consequences:

Performance degradation: As refrigerant charge decreases, system capacity falls. Temperatures rise, food safety margins narrow, and the system works harder to maintain set points, increasing energy consumption.

Environmental impact: High-GWP refrigerants released into the atmosphere contribute to climate change. Regulatory requirements under the EPA’s Clean Air Act impose reporting obligations and financial penalties for significant releases.

Operating costs: Refrigerant is expensive. A system with chronic small leaks requires frequent refrigerant additions, adding direct cost while masking the underlying problem.

Regulatory compliance: The EPA’s refrigerant management regulations require operators to track refrigerant use and address leak rates above defined thresholds. Proper commissioning documentation supports compliance.

Bravo Tampa: The Commissioning Process

Dynamiq’s work at Bravo Supermarkets in Tampa illustrates the systematic approach required for reliable refrigeration installation. The commissioning sequence follows a defined protocol:

System Evacuation

Before pressure testing, the system is evacuated using vacuum pumps to remove air and moisture from the piping. Achieving a deep vacuum (typically below 500 microns) is essential — residual moisture in the system will combine with refrigerant to form acids that degrade oil, corrode copper, and damage compressor components.

The evacuation process also provides an initial check of system tightness. A system that cannot hold a deep vacuum likely has leak points that must be found and addressed before proceeding.

Pressure Testing

The evacuated system is pressurized with dry nitrogen to a test pressure appropriate for the system design. Nitrogen is used rather than refrigerant for safety and environmental reasons — it is inert, non-toxic, and has no environmental impact if released.

The system is held at test pressure for a defined period while pressure is monitored. A stable pressure reading indicates that the system holds pressure adequately. Any pressure drop indicates leak points that must be located and repaired.

Leak Detection

Even after a successful pressure hold, Dynamiq performs a systematic leak check of all connections, joints, and fittings using electronic leak detectors. These instruments detect refrigerant concentrations far below human perceptible levels, identifying small leaks that would not cause measurable pressure drop during a short test period but would result in ongoing refrigerant loss in operation.

All identified leak points are repaired and re-tested before the system is charged with refrigerant.

Documentation

Dynamiq’s commissioning documentation records the evacuation depth achieved, test pressure and duration, and results of leak detection surveys. This documentation serves as the baseline record for the system’s initial state and supports compliance with refrigerant management regulations.

Long-Term Leak Management

Initial commissioning leak checking establishes system integrity, but refrigerant management is an ongoing responsibility. Vibration, thermal cycling, and physical impacts can create new leak points over a system’s operating life. Dynamiq’s preventive maintenance programs include periodic leak detection surveys to catch developing leaks before they result in significant refrigerant loss.

The combination of rigorous commissioning and ongoing monitoring is what keeps refrigeration systems operating at designed performance levels throughout their service life.