1.1 本规程包括对由未焊接空气通道分隔的平行土工膜接缝的连续性进行无损评估。在两个不同的缝合区域之间的未焊接的空气通道被密封并用空气充气到预定压力。这种做法可以比其他常见的无损检测更快地评估长焊缝。 1.2 这种做法不应被用作破坏性测试的替代品。该方法与破坏性测试结合使用，可以提供有关正在进行测试的接缝的额外信息。 1.3 这项实践取代了实践 D4437/D4437米 用于包括空气通道的土工膜接缝。实践 D4437/D4437米 可以继续用于其他类型的接缝。有关土工膜接缝技术和施工质量保证的更多信息，请参考参考标准或EPA/530/SW-91/051。 1.4 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ===意义和用途====== 5.1 越来越多地使用土工膜作为阻挡材料来限制液体或气体的流动，以及在连接这些薄板时普遍使用双轨接缝，这就产生了对标准无损检测的需求，通过该检测可以评估接缝的连续性和水密性。 该试验不旨在提供接缝物理强度的任何指示。 5.2 本规程建议在双接缝轨道之间形成的通道内进行空气压力测试，从而可以识别接缝区域中是否存在未粘合部分或通道、空隙、非均匀性、不连续性、异物等。 5.3 该技术适用于由适当的聚合物和复合成分配制的土工膜片材之间的接缝，以形成符合产品最终用途所有规定要求的塑料或弹性体片材。

1.1 This practice covers a nondestructive evaluation of the continuity of parallel geomembrane seams separated by an unwelded air channel. The unwelded air channel between the two distinct seamed regions is sealed and inflated with air to a predetermined pressure. Long lengths of seam can be evaluated by this practice more quickly than by other common nondestructive tests. 1.2 This practice should not be used as a substitute for destructive testing. Used in conjunction with destructive testing, this method can provide additional information regarding the seams undergoing testing. 1.3 This practice supercedes Practice D4437/D4437M for geomembrane seams that include an air channel. Practice D4437/D4437M may continue to be used for other types of seams. The user is referred to the referenced standards or to EPA/530/SW-91/051 for additional information regarding geomembrane seaming techniques and construction quality assurance. 1.4 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. 1.5 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 ====== 5.1 The increased use of geomembranes as barrier materials to restrict liquid or gas movement, and the common use of dual-track seams in joining these sheets, has created a need for a standard nondestructive test by which the quality of the seams can be assessed for continuity and watertightness. The test is not intended to provide any indication of the physical strength of the seam. 5.2 This practice recommends an air pressure test within the channel created between dual-seamed tracks whereby the presence of unbonded sections or channels, voids, nonhomogenities, discontinuities, foreign objects, and the like, in the seamed region can be identified. 5.3 This technique is intended for use on seams between geomembrane sheets formulated from the appropriate polymers and compounding ingredients to form a plastic or elastomer sheet material that meets all specified requirements for the end use of the product.