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Workshop: Vacuum Metrology for Industrial Environments 27 June 2013

Workshop: Vacuum Metrology for Industrial Environments 27 June 2013. QUALITATIVE AND QUANTITATIVE METHODS FOR LEAK TESTING. Definition according ASNT. Non-Destructive Testing

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Workshop: Vacuum Metrology for Industrial Environments 27 June 2013

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  1. Workshop: Vacuum Metrology for Industrial Environments 27 June 2013 QUALITATIVE AND QUANTITATIVE METHODS FOR LEAK TESTING

  2. Definitionaccording ASNT • Non-DestructiveTesting • “Non-destructive testing is to determine the physical conditions of an object avoiding to compromise the functions for which the object was constructed.” LEAK TESTING: definition Torino, 27 June 2013

  3. LeakTesting Torino, 27 June 2013

  4. The unitofmeasurementofgaseous flow: mbar·L/s Torino, 27 June 2013

  5. The CorrectApproach Torino, 27 June 2013

  6. MethodsforLeak Detection Torino, 27 June 2013

  7. PressureChangeMethod Torino, 27 June 2013

  8. PressureChangeMethod Torino, 27 June 2013

  9. PressureChangeMethod Torino, 27 June 2013

  10. Bubble test Torino, 27 June 2013

  11. Bubble test Torino, 27 June 2013

  12. Bubble Test Application (vacuum) Torino, 27 June 2013

  13. Ultrasonic Detection The directionality of ultrasound is a fundamental characteristic, while the intensity is an inverse function of source-sensor distance. Torino, 27 June 2013

  14. Ultrasonic Detection Torino, 27 June 2013

  15. Ultrasonic Detection Torino, 27 June 2013

  16. for being detected. TracerGases Torino, 27 June 2013

  17. TracerGases:ThermalConductivity These characteristics varies with dependence from molecular size and speed. They can be used with different gas or gas mixtures, since each of them produces a different thermal conductivity respect to the air. Torino, 27 June 2013

  18. TracerGases:ThermalConductivity Torino, 27 June 2013

  19. TracerGases:ThermalConductivity Torino, 27 June 2013

  20. TracersGases: Mass Spectrometry Torino, 27 June 2013

  21. TracersGases: QuartzCapillary In this leak detector, the detection system of the tracer gas (helium) is constituted by a membrane in quartz, permeable only for helium and not other gases present in the atmosphere. Torino, 27 June 2013

  22. Torino, 27 June 2013

  23. He Torino, 27 June 2013

  24. Test Methodswith Mass Spectrometry Torino, 27 June 2013

  25. Test Methodswith Mass Spectrometry Torino, 27 June 2013

  26. Test Methodswith Mass Spectrometry Torino, 27 June 2013

  27. It is firstly possible distinguish two different types for the leak testing: • Leak Detection Methods (QUALITATIVE), generally controlled by operator, with localization of leak: • Method in Water withpressurizedpiece (visualinspection); • MethodwithBubble (soap solution) withpressurizedpiece (visualinspection); • MethodwithUltravioletLampswithpressurizedpiece (visualinspection); • Methodwith Hot Air (visualinspection at infrared); • MethodwithDielectricVariation on plastic components (ionic system at high voltage). Torino, 27 June 2013

  28. B) Leak Detection Method (QUANTITATIVE) withindicationofGood, RejectPiece and valueof leakrate: • Measurementwithpresurized gas (Helium); • Measurement the flow meterof the pressurizedpiece; • Measurementof the pressuredifferentialbetween the pressurizedpiece and the reference sample; • Measurementof the pressure decay of the pressurizedpiece; • Measurement “compliance” ofpressureincrease in vacuumbell. The instrumentation of this type allows you to monitor in time any drifts of quality, if it is applied throughout the production. Torino, 27 June 2013

  29. MetrologicalLaboratory Torino, 27 June 2013

  30. Gas Injection System Pumping System LT-SP-1 Pumping System LT-SP-2 Leak in Calibration PressureGauge LT-TP-1 Mass Spectrometer ReferenceCapillaryLeak ReferenceCapillaryLeak ReferenceCapillaryLeak Scheme of calibration system ReferencePermeationLeak Torino, 27 June 2013

  31. The calibration requires a calibrated device: REFERENCE LEAK Torino, 27 June 2013

  32. JRP14i – Joint Research Project - Work Packages 2 – Optimization of the process of measurement and leak testing in an industrial environment. Torino, 27 June 2013

  33. JRP14i – Joint Research Project - Work Packages 2 – Optimization of the process of measurement and leak testing in an industrial environment. Study and analysis of the main parameters of the leak detector for refrigerants. Manufacturing of Capillary Leak with Gas Refrigerants (respect to atmosphere). Study of the behavior of the flow of Gas Refrigerants through capillary leaks. Torino, 27 June 2013

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