Leak testing

The standard specifies overpressure and vacuum leak tests. Of the overpressure tests the following are listed: leak tests by liquid overpressure, liquid overpressure using a differential pressure gauge, gas overpressure, gas overpressure using a differential pressure gauge, bubble leak test, leak test using a solution of fluorescein and halogen and helium overpressure tests. For each test a diagram is given of the equipment used, the procedure of testing and the method of test evaluation. Vacuum leak tests are classified into halogen tests, halogen tests with auxiliary rotary air pump, halogen with compound necks, halogen with bypass, helium with auxiliary rotary air pump, helium with pumping by diffusion air pump, helium using a rotary and diffusion air pump, helium using two measuring paths, helium with compound necks and leak tests by measuring the increase of pressure in the vacuum and by measuring increased pressure in the vacuum with known leak. A diagram of the equipment used and the testing procedures are represented for each vacuum test. (E.S.)