1.1 规程A，加压- 本规程涵盖了超声波仪器的校准程序、位置以及通过机载超声波技术对气体泄漏到大气中的估计测量。 2. 1.2 在一般实践中，这应限于通过两类仪器（I类和II类）检测到的泄漏。I类仪器的最小可检测泄漏率应为6.7 × 10 −7. 摩尔/秒（1.5 × 10 − 2. 标准厘米 3. /对于气体泄漏到大气中的压力法。II类仪器的最小可检测泄漏率应为6.7 × 10 −6. 摩尔/秒（1.5 × 10 −1. 标准厘米 3. /对于气体泄漏到大气中的压力法。请参阅指南 E432 了解更多信息。 1.3 实践B，超声波发射器- 对于不能够加压但能够将超声波音调放置/注入测试区域以作为超声波泄漏跟踪源的被测物体。 1.3.1 这种做法仅限于产生6.7级泄漏的泄漏 × 10 −6. 摩尔/秒（1.5 × 10 −1. 标准厘米 3. /0°C）或更高。 1.4 以国际单位制表示的数值应视为标准。 1.5 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前咨询并建立适当的安全、健康和环境实践，并确定监管限制的适用性。 1.6 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 6.1 练习A- 作为质量控制测试或现场检查程序，本规程有助于定位和估计加压气体泄漏的大小。在采用其他更耗时和更敏感的泄漏测试之前，它作为预测试也很有价值。不应仅用于定位剧毒或爆炸性气体泄漏。 6.2 实践B- 作为质量控制或现场检查程序，本规程有助于定位未处于压力或真空下的系统中的泄漏。它对于估计泄漏的大小没有用处。在使用加压气体方法进行泄漏测试之前，它作为预测试也很有价值，并且使用了更敏感的泄漏测试。

1.1 Practice A, Pressurization— This practice covers procedures for calibration of ultrasonic instruments, location, and estimated measurements of gas leakage to atmosphere by the airborne ultrasonic technique. 2 1.2 In general practice this should be limited to leaks detected by two classifications of instruments, Class I and Class II. Class I instruments should have a minimum detectable leak rate of 6.7 × 10 −7 mol/s (1.5 × 10 − 2 std. cm 3 /s at 0°C) or more for the pressure method of gas leakage to atmosphere. Class II instruments should have a minimal detectable leak rate of 6.7 × 10 −6 mol/s (1.5 × 10 −1 std. cm 3 /s at 0°C) or more for the pressure method of gas leakage to atmosphere. Refer to Guide E432 for additional information. 1.3 Practice B, Ultrasonic Transmitter— For object under test not capable of being pressurized but capable of having ultrasonic tone placed/injected into the test area to act as an ultrasonic leak trace source. 1.3.1 This practice is limited to leaks producing leakage of 6.7 × 10 −6 mol/s (1.5 × 10 −1 std. cm 3 /s at 0°C) or greater. 1.4 The values stated in SI units are to be regarded as the 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 consult and 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. ====== Significance And Use ====== 6.1 Practice A— This practice is useful for locating and estimating the size of pressurized gas leaks, either as a quality control test or as a field inspection procedure. It is also valuable as a pretest before other more time consuming and more sensitive leak tests are employed. It should not be used exclusively to locate highly toxic or explosive gas leaks. 6.2 Practice B— This practice is useful for locating leaks in systems that are not under pressure or vacuum as either a quality control or a field inspection procedure. It is not useful for estimating the size of a leak. It is also valuable as a pretest before leak tests using pressurized gas methods and more sensitive leak tests are employed.