Leak Testing Equipment (Water Dispenser Manufacturing)

 Leak Testing Equipment is used to detect refrigerant system leaks before refrigerant charging. It ensures the refrigeration circuit is completely sealed and prevents future cooling failures.

Purpose

  • Detect leaks in copper tubing, joints, condenser, evaporator, and compressor connections.
  • Prevent refrigerant loss.
  • Ensure product reliability and quality.
  • Reduce warranty claims and rework

Types of Leak Testing Equipment

1. Air Pressure Leak Tester

  • Compressed air is filled into the refrigeration system.
  • Pressure drop is monitored over time.
  • Suitable for preliminary leak testing.

2. Nitrogen Leak Test Station

  • Dry nitrogen is charged into the system at a specified pressure.
  • Pressure gauge monitors pressure stability.
  • Widely used in manufacturing due to safety and accuracy.
3. Electronic Refrigerant Leak Detector
  • Detects trace amounts of refrigerant gas escaping from leaks.
  • Used after refrigerant charging or during service.

  • 4. Helium Leak Detector

    • Helium is introduced into the system.
    • Mass spectrometer detects extremely small leaks.
    • High-precision method used for premium products.

    5. Bubble Test Equipment

    • Soap solution applied to joints.
    • Bubbles indicate leak locations.
    • Low-cost verification method.

    Manufacturing Process Placement

  •    Main Components
  • Nitrogen cylinder
  • Pressure regulator
  • Digital pressure gauge
  • Test fixture and connectors
  • Leak detector sensor
  • PLC/HMI control panel
  • Air or nitrogen supply system

  • Typical QC Parameters

    ParameterTypical Check
    Test PressurePer design specification
    Pressure Holding TimePer SOP
    Pressure DropNo significant loss
    Leak Detector ResponsePass
    System StatusOK/NG

    Lean Manufacturing Considerations

    • Poka-Yoke fixtures prevent incorrect connections.
    • Automatic pass/fail indication.
    • Traceability by serial number.
    • SPC monitoring of leak-test results.
    • Andon alarm for test failures.

    • CTQ (Critical to Quality)

      For a water dispenser refrigeration assembly line, leak testing is a Critical-to-Quality (CTQ) checkpoint because any undetected leak can lead to:

      • Loss of cooling performance
      • Increased power consumption
      • Compressor failure
      • Customer complaints
      • Environmental impact due to refrigerant release
      Typical Manufacturing Sequence: Leak Test → Vacuum Evacuation → Refrigerant Charging → Cooling Performance Test → Final Inspection.

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