1.1 本规程为下水道和其他重力流应用中使用的埋地热塑性塑料管的安装提供了建议。这些建议旨在确保热塑性塑料管道在广泛的使用条件下具有稳定的地下环境。然而，由于可使用的柔性塑料管产品众多，以及自然地面条件的固有可变性，要实现任何一种产品的满意性能，可能需要修改本文中的规定，以满足特定的项目要求。 1.2 本规程的范围必然不包括产品性能标准，如最小管道刚度、最大使用挠度或长期强度。因此，产品制造商、规范制定者或项目工程师有责任验证并确保指定用于预期应用的管道，当根据本规程中概述的程序安装时，将根据该应用制定的标准提供长期、令人满意的性能。 关于实现满意安装的重要因素的评论包含在 附录X1 . 注1: 附录中的具体段落在本规程正文中引用，以供参考。 注2: 以下ASTM标准可能对本规程有用:规程 D420 ，试验方法 D1556 方法 D2216 规格 D2235 ，试验方法 D2412 规格 D2564 实践 D2657 实践 D2855 ，试验方法 D2922 ，试验方法 D3017 实践 F402 规格 F477 规格 F545 ，和规格 F913 . 注3: 大多数管道规范和一些建筑规范都规定了地下“建筑排水管和建筑下水道”的安装有关卫浴管道应用，请参阅它们。 1.3 单位- 以英寸表示的值- 磅单位应视为标准单位。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。 1.4 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。 1.5 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====== 4.1 本规程供设计人员和规范人员、安装承包商、监管机构、业主和检验机构使用，这些机构参与了使用柔性热塑性塑料管的下水道和其他重力流应用的施工。与任何标准实践一样，可能需要针对特定工作条件或特殊的地方或区域条件进行修改。关于将这种做法纳入特定项目合同文件的建议，请参见 附录X2 .

1.1 This practice provides recommendations for the installation of buried thermoplastic pipe used in sewers and other gravity-flow applications. These recommendations are intended to ensure a stable underground environment for thermoplastic pipe under a wide range of service conditions. However, because of the numerous flexible plastic pipe products available and the inherent variability of natural ground conditions, achieving satisfactory performance of any one product may require modification to provisions contained herein to meet specific project requirements. 1.2 The scope of this practice necessarily excludes product performance criteria such as minimum pipe stiffness, maximum service deflection, or long term strength. Thus, it is incumbent upon the product manufacturer, specifier, or project engineer to verify and assure that the pipe specified for an intended application, when installed according to procedures outlined in this practice, will provide a long term, satisfactory performance according to criteria established for that application. A commentary on factors important in achieving a satisfactory installation is included in Appendix X1 . Note 1: Specific paragraphs in the appendix are referenced in the body of this practice for informational purposes. Note 2: The following ASTM standards may be found useful in connection with this practice: Practice D420 , Test Method D1556 , Method D2216 , Specification D2235 , Test Method D2412 , Specification D2564 , Practice D2657 , Practice D2855 , Test Methods D2922 , Test Method D3017 , Practice F402 , Specification F477 , Specification F545 , and Specification F913 . Note 3: Most Plumbing Codes and some Building Codes have provisions for the installation of underground “building drains and building sewers.” See them for plumbing piping applications. 1.3 Units— 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 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 ====== 4.1 This practice is for use by designers and specifiers, installation contractors, regulatory agencies, owners, and inspection organizations who are involved in the construction of sewers and other gravity-flow applications that utilize flexible thermoplastic pipe. As with any standard practice, modifications may be required for specific job conditions or for special local or regional conditions. Recommendations for inclusion of this practice in contract documents for a specific project are given in Appendix X2 .