Transcription of VTECH LEAK DETECTION - vtechonline.com
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VTECH LEAK DETECTION . Leak DETECTION Theory and Practise Comparison among leak testing techniques Rev. 1 29 Mar. 06. VTECH_leak_detection -0- Rev. 2 23 nov. 2004. INDEX. 1. INTRODUCTION .. 3. 2. LEAK 4. 3. LEAKAGE MEASUREMENT 4. 4. LEAK SIZES .. 4. 5. SOME USEFUL FORMULAE .. 6. Ideal Gas Law and Real Gases .. 6. Gas Flow and Leak Rate .. 7. Turbulent flow .. 7. Laminar flow .. 8. Molecular flow .. 9. Transitional flow .. 10. Gas 11. Laminar flow .. 11. Molecular flow .. 11. Conversion from Mass Leak Rate to Volume Leak Rate .. 11. Diffusion of Gases .. 12. Permeation .. 12. 6. LEAK TESTING IN REFRIGERATION INDUSTRY .. 13. 7. LEAK TESTING 13. Ultrasonic Leak 15. Water Immersion Bubble Test Method .. 15. Soap Solution Bubble Test .. 17. Pressure Decay Test .. 17. Vacuum Decay Test or Pressure Rise 19.
VTECH_leak_detection -5 - Rev. 1 – 29 Mar. 06 generally in the range 10-9 ÷ 1 · mbar l/s, while the majority of products require less stringent specifications, usually 10-6 ÷ 1 · mbar l/s. Only few products, such as very long life systems and high-
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