ASTM E908-98(2018)
Standard Practice for Calibrating Gaseous Reference Leaks
- Standard No.
- ASTM E908-98(2018)
- Release Date
- 2018
- Published By
- American Society for Testing and Materials (ASTM)
- Status
- 2022-06
- Replace By
- ASTM E908-98(2022)
- Latest
- ASTM E908-98(2022)
- Scope
- 1.1 This practice covers procedures for calibrating leak artifacts of a specified gas, that may be used for determining the response of leak detectors, or in other situations where a known small flow of gas is required. The purpose of this practice is to establish calibration without reference to other calibrated leaks in as straightforward a manner as possible using the likeliest available equipment. While the uncertainties associated with these procedures will most likely be greater than those obtained via traceable calibration chains (on the order of 10 %), these procedures allow independent means of establishing or verifying the leakage rate from leak artifacts of questionable history, or when traceable leak artifacts are not available. 1.2 Two types of leaks are considered: 1.2.1 Type I—Pressure to vacuum. 1.2.2 Type II—Pressure to atmosphere. 1.3 Three calibration methods are described under each type of reference leak: 1.3.1 Method A—Accumulation comparison, using a known volume of gas at specified conditions of temperature and pressure as a reference. 1.3.2 Method B—Accumulation comparison, using a leak artifact calibrated using Method A. 1.3.3 Method C—Displacement of a liquid slug, by the leak, in capillary tube of known dimensions. 1.4 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
ASTM E908-98(2018) Referenced Document
- ASTM E425
- ASTM E427 Standard Practice for Testing for Leaks Using the Halogen Leak Detector(Alkali-Ion Diode)
- ASTM E479 Standard Guide for Preparation of a Leak Testing Specification
- ASTM F134
ASTM E908-98(2018) history
- 2022 ASTM E908-98(2022) Standard Practice for Calibrating Gaseous Reference Leaks
- 2018 ASTM E908-98(2018) Standard Practice for Calibrating Gaseous Reference Leaks
- 1998 ASTM E908-98(2012) Standard Practice for Calibrating Gaseous Reference Leaks
- 1998 ASTM E908-98(2004) Standard Practice for Calibrating Gaseous Reference Leaks
- 1998 ASTM E908-98 Standard Practice for Calibrating Gaseous Reference Leaks
