1.1 本规程包括使用火花试验对土工膜中的现场接缝进行无损检测。可疑区域由火花的产生指示。该试验适用于挤压法制成的接缝、使用焊接胶带制成的接缝（与土工膜相同类型材料的条带，焊接在土工膜的相邻部分上以形成接缝），或在制造之前或制造过程中可在接缝中插入导电材料的接缝。 1.2 火花测试可能会产生电火花，因此只能在电火花不会产生危险的情况下使用。 1.3 除非仔细遵守规定的电压和距离，否则可能会出现“误报”指示。 当电弧距离对于测试时和测试条件下施加的电压来说太大时，就会出现这种误报。 1.4 以国际单位制表示的数值应视为标准值。括号中给出的值仅供参考。 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。 1.6 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====== 5.1 土工膜现场接缝的火花检测在其他无损检测方法不可行的位置特别有用，例如在管道周围的紧密角落或环缝中。

1.1 This practice covers the nondestructive testing of field seams in geomembranes using the spark test. A suspect area is indicated by the generation of a spark. The test is applicable to seams made by the extrusion method, seams made by using welding tape (a strip of the same type of material as the geomembrane, that is welded over adjacent sections of geomembrane to create a seam), or seams where it is practical to insert a conductive material in the seam just prior to or during fabrication. 1.2 The spark test may produce an electrical spark and therefore can only be used where an electrical spark would not create a hazard. 1.3 Unless the voltages and distances prescribed are carefully adhered to, a “false positive” indication may result. This false positive occurs when the arc distance is too large for the voltage applied at the time and conditions of testing. 1.4 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only. 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. ====== Significance And Use ====== 5.1 Spark testing of geomembrane field seams is particularly useful in locations where other nondestructive test methods are not practical, for example in tight corners or a circumferential seam around a pipe.