B31.3 requires that each piping system be leak-tested to ensure tightness prior to initial operation [ΒΆ345.1]. B31 imposes certain restrictions on the types of leak tests which may be used, some general requirements for conducting leak tests, some preparation requirements for leak tests, some specific requirements for each type of leak test, and some record keeping requirements.
The following six types of leak tests are described in B31.3: