1.1 本规范涵盖了仅用于维护或修理现有PVC气体管道的PVC管道和卡套管的要求。本规范涵盖了用于维护或修理现有PVC气体管道的配件要求。 1.1.1 厂内质量控制程序在 附件A1 。 1.2 本规范的文本引用了提供解释材料的注释和脚注以及附录。这些注释和脚注（不包括表和图中的注释和脚注）不应被视为规范的要求。 1.3 以英寸磅为单位的数值应视为标准。括号中给出的值是国际单位制的数学转换，仅供参考，不被视为标准。 1.4 以下是本规范附件的索引: 附件 主题 附件A1 PVC材料的厂内质量控制 高达6英寸。 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。 1.6 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。

1.1 This specification covers requirements for PVC pipe and tubing for use only to maintain or repair existing PVC gas piping. This specification covers requirements for fittings for use to maintain or repair existing PVC gas piping. 1.1.1 In-plant quality control programs are specified in Annex A1 . 1.2 The text of this specification references notes and, footnotes, and appendixes which provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the specification. 1.3 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. 1.4 The following is an index of the annexes in this specification: Annex Subject Annex A1 In-Plant Quality Control for PVC materials up to 6 in. 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.