Chemglass AF-0349 Welch Vacuum Pump - Manual (Page 24)

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Section 7: TROUBLE SHOOTING
7.01 Leak Detection
The importance of eliminating all leaks in a vacuum system is obvious when it is realized that a leak into the system,
at atmospheric pressure, expands in volume by a factor of 750,000 to 10,000,000 or more. The pump must remove
this added volume to maintain the desired vacuum. Fortunately a number of effective techniques for leak detection
have been developed:
Large Leaks
Locate by pressurizing the system and painting the suspected area with a thick soap solution. Escaping air will
produce soap bubbles.