·Table of Contents
·Nuclear Industry

Gas Leakage Test Using Helium Leak Detector Equipment

Oscar S. Orlando


Airtightness requisites

Experiences performed in laboratory

Calibrated leaks

Conversion factors for different gases flux

General considerations about vacuum or pressure equipment

High vacuum system

Medium vacuum system

Real leaks and virtual leaks

Gases permeability

Vacuum measurement

Pressure increment measurement



  1. ISO international standard N0 135
  2. Leybold-Heraeus, handbook
  3. Vacuum components standard systems Leybold
  4. ISO international standard N0 3753
  5. ISO international standard N0 9978-1992
  6. DIN 25412
  7. IRAM 3563

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