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Significance and Use
The immersion technique is frequently used to locate leaks in sealed containers. Leaks in a container can be seen independently. Leak size can be approximated by the size of the bubble. It is not suitable for measurement of total system leakage.
The liquid film technique is widely applied to components and systems that can not easily be immersed and is used to rapidly locate leaks. An approximation of leak size can be made based on the type of bubbles formed, but the technique is not suitable for measuring leakage rate. It can be used with a vacuum box to test vessels which cannot be pressurized or where only one side is accessible.
Accuracy—This practice is not intended to measure leakage rates, but to locate leaks on a go, no-go basis. Their accuracy for locating leaks of 4.5 × 10−10 mol/s (1 × 10−4 Std cm3/s) and larger is ±5 %. Accuracy for locating smaller leaks depends upon the skill of the operator.
Repeatability—On a go, no-go basis, duplicate tests by the same operator should not vary by more than ±5 % for leaks of 4.5 × 10−9 mol/s (1 × 10−4 Std cm3/s).
Reproducibility—On a go, no-go basis, duplicate tests by other trained operators should not vary by more than 10 % for leaks of 4.5 × 10−9 mol/s (1 × 10−4 Std cm3/s) and larger.
1.1 This practice covers procedures for detecting or locating leaks, or both, by bubble emission techniques. A quantitative measure is not practical. The normal limit of sensitivity for this test method is 4.5 × 10−10 mol/s (1 × 10−5 Std cm3/s).
1.2 Two techniques are described:
1.2.1 Immersion technique, and
1.2.2 Liquid application technique.
Note 1—Additional information is available in ASME Boiler and Pressure Vessel Code, Section V, Article 10-Leak Testing, and Guide E479.
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.4 This standard does not purport to address the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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
Other DocumentsNAS-410 Certification and Qualification of Nondestructive Test Personnel Available from Aerospace Industries Association of America, Inc. (AIA), 1000 Wilson Blvd., Suite 1700, Arlington, VA 22209-3928, http://www.aia-aerospace.org.
Military StandardMIL-L-25567D Leak Detection Compound Oxygen Systems Available from Standardization Documents Order Desk, DODSSP, Bldg. 4, Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http://dodssp.daps.dla.mil.
UNSPSC Code 41111809(Leak testing equipment)