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Soap Bubble Pressure Testing
Soap bubble pressure testing is a
non-destructive
testing technique in which the item
in question is pressurized to an internal pressure
greater than atmospheric pressure (14.7 psi).
When the system/item to be tested is pressurized,
the outside surface is sprayed/soaked with a
solution of liquid soap in water, i.e., soap bubble
solution. If the internal pressured gas
(usually air) escapes into the atmosphere through a
hole or crack
, which is coated/covered with the soap
bubble solution, then a coherent volume of soap
bubbles will be generated, thereby identifying the
leak area. |
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