1.1 本规程涵盖完全由聚乙烯制成的用于连接聚乙烯管道或容器零件的对接熔合接头的微波（MW）检查。 注1: 本规程中的注释仅供参考，不应视为本规程的一部分。 注2: 本规程参考了规范中定义的管道应用中的HDPE和MDPE D3350 . 1.2 微波检测检测被检测材料介电常数之间的差异。这些差异可能是由于材料结构（预期）或缺陷，如空隙、裂缝或异物侵入（意外）。 1.3 对接熔合连接过程可能存在各种缺陷，包括但不限于未熔合、颗粒污染、夹杂物和空洞。 1.4 本规程适用于直径为4 mm的聚乙烯对接熔焊接头 在里面 至65 在里面(100 毫米–1650 mm），壁厚0.5 在里面至4 在里面(12 毫米–100 毫米）。如果可以证明该技术能够在相同壁厚和几何形状的实体模型上提供足够的检测，则可以使用本标准惯例测试较大和较小的厚度和直径。 1.5 本标准实施规程不涉及电熔接头、承插接头或鞍座的微波检查。 1.6 本标准仅详细说明检验要求。验收/拒收标准必须通过合同确定，通常使用多个样品进行机械试验（即拉伸试验）验证。 1.7 以英寸-磅为单位的数值应视为标准值。括号中给出的值是到国际单位制的数学转换，仅供参考，不被视为标准值。 1.8 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。 1.9 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 聚乙烯管道因其耐腐蚀、耐侵蚀和可靠性，已在石化、电力、水、天然气配送和采矿行业中取代钢合金。最近，聚乙烯管也被用于核安全相关的冷却水应用。

1.1 This practice covers microwave (MW) examination of butt fusion joints made entirely of polyethylene for the purpose of joining polyethylene piping or vessel parts. Note 1: The notes in this practice are for information only and shall not be considered part of this practice. Note 2: This practice references HDPE and MDPE for pipe applications as defined by Specification D3350 . 1.2 MW examination detects differences between the dielectric constant(s) of the materials being examined. These differences may be due to material construction (expected) or flaws such as voids, cracks, or foreign material intrusion (unexpected). 1.3 The butt fusion joining process can be subject to a variety of flaws including, but not limited to, lack of fusion, particulate contamination, inclusions, and voids. 1.4 This practice is intended for use on polyethylene butt fusion joints of pipe diameters of 4 in. to 65 in. (100 mm – 1650 mm) and wall thickness of 0.5 in. to 4 in. (12 mm – 100 mm). Greater and lesser thicknesses and smaller diameters may be tested using this standard practice if the technique can be demonstrated to provide adequate detection on mockups of the same wall thickness and geometry. 1.5 This standard practice does not address microwave examination of electrofusion joints, socket joints, or saddles. 1.6 This standard details inspection requirement only. Accept/reject criteria must be established contractually and is typically done using multiple samples with mechanical test (that is, tensile test) validation. 1.7 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. 1.8 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. 1.9 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 Polyethylene piping has been used instead of steel alloys in the petrochemical, power, water, gas distribution, and mining industries due to its resistance to corrosion, erosion, and reliability. Recently, polyethylene pipe has also been used for nuclear safety related cooling water applications.