Production leak testing can mean a lot of different things, and if you are not familiar with this branch of nondestructive testing, the choices of methodologies and techniques can seem a bit daunting. To begin with, there is leak location testing and leak measurement testing, with various approaches to accomplish either of these, or sometimes both.
There are three types of bubble emission testing; all include a core routine where the part is sealed and pressurized with a compressed gas—normally air—to identify any leaks.