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Significance and Use
5.1 The equipment, test duration, and technique should be determined before commencement of the test based on the required test sensitivity or accuracy (see Annex A1 and Annex A2). If the test is used to certify that the vessel has a minimum specified leakage rate, then the test equipment and test duration should be chosen to have a resolution ten times less than the specification and an accuracy which is four times less than the specification. The test should be designed so that the total pressure change is less than 10 % of the starting pressure. Leak test specifications should specify the vessel test pressure or differential pressure. If the test specification does not specify a test pressure, then a safe test pressure should be used that complies with the applicable safety standards7.
1.1 This practice describes a method for determining the leakage rate of a vessel subject to a positive pressure difference. The technique is based upon evaluation of the change of mass within the test object based on a pressure decay measurement. The pressure decay measurement uses the ideal gas equation of state and the measured pressures, temperatures, and time to determine the mass loss from the vessel. This method does not apply to deformable vessels.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
E479 Guide for Preparation of a Leak Testing Specification
E543 Specification for Agencies Performing Nondestructive Testing
E1316 Terminology for Nondestructive Examinations
ANSI/ASNT StandardsANSI/ASNT-CP-189 Standard for Qualification and Certification of Nondestructive Testing Personnel
AIA DocumentNAS-410 Certification and Qualification of Nondestructive Testing Personnel
ASME StandardsASME Boiler and Pressure Vessel Code Section V Article 10 (paragraph T-1044)
ICS Number Code 23.020.30 (Pressure vessels, gas cylinders)