False Positiveīubbles cling to surface of the package after package is submerged in water. When testing is complete, switch off pump and relieve the vacuum.Ī steady stream of bubbles comes from the package at one or more locations.Increase vacuum (up to 30 inHg) until the package is expanded.Turn on a vacuum pump and open a regulator valve to generate vacuum inside.Place a package to be tested in the chamber and close the lid.Fill the chamber with enough water to submerge a package when expanded.Loading computations for general aviation aircraft are discussed using both.
The reproducibility and sensitivity of bubble testing depends on the use of a dark background (increased contrast), high pressure differentials, and the operator. This handbook is available for download, in PDF format, from. The sensitivity of the test is not high, due to operator dependence. This method provides immediate indications of the existence and location of small leaks.ĭisadvantages include a long test time (a minimum of 30 seconds per test), low sensitivity, the tendency of leaks to get clogged by viscous food materials during testing, water contamination, and part clean-up time. If there's a leak, air or gas flow through leaks will result in the formation of bubbles outside the package. The headspace above the water level is evacuated, which cause the package to inflate. Leak detection is performed by immersing the package in a water-filled test chamber. PIPER PA28 & OTHER NOSE AXLE AVAILABLE Complete axle caps, bolt, hardware 125+SH PA28 thru light twins PLZ email response Contact David Lambert - INTEGRITY AIR, - located Laramie, WY United States Telephone: 30 Posted Octo Show all Ads posted by this Advertiser Recommend This Ad to a Friend Email Advertiser Save to Watchlist Report. The procedure involves creation of a pressure differential across the package with air (or some other gas) on the high pressure side (inside package) and a water chamber on the low pressure side (outside package). Bubble testing is the simplest, least expensive method of detecting and assessing leaks.