Leak identification methods

Many types of nondestructive, leak, corrosion evaluation and mechanical tests may be used to establish and verify quality requirements of the materials specification. In addition, identification markings enable materials to be checked for specification conformance. Field identification methods must be used when all else has failed, but their limitations must be understood. 

Leak identification is normally carried out by one or more of the following methods ... 

Electronic leak detectors, which are capable of sensitivities far greater than the other methods—often in terms of fractions of an ounce of fluorocarbon per year. When the probe of the instrument is placed near a leak, positive identification of the leak is indicated by a flashing light, by meter deflection, or by audible means. 

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