1.1 本规范涵盖了双壁聚丙烯管和管件的要求和试验方法。覆盖的标称内径为12至60英寸。[300至1500毫米]。 1.2 本规范的要求旨在为无压雨水管系统提供适合地下使用的管道和配件。根据本规范生产的管道和配件应按照惯例安装 D2321 . 1.3 本规范涵盖具有内部光滑壁和环形波纹轮廓外壁的管道和管件( 图1 ). 图1 内部光滑壁和环形波纹型材外壁 1.4 单位- 以国际单位制或英寸表示的数值- 磅单位应单独视为标准单位。每个系统中规定的值可能不是精确的等效值；因此，每个系统应相互独立使用。将两个系统的值合并可能会导致不符合标准。 1.5 以下预防性声明警告仅适用于试验方法部分第节 8. ，符合本规范。 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。

1.1 This specification covers requirements and test methods for dual wall polypropylene pipe and fittings. The nominal inside diameters covered are 12 to 60 in. [300 to 1500 mm]. 1.2 The requirements of this specification are intended to provide pipe and fittings suitable for underground use for non-pressure storm sewer systems. Pipe and fittings produced in accordance with this specification shall be installed in compliance with Practice D2321 . 1.3 This specification covers pipe and fittings with an interior smooth wall and an annular corrugated profile outer wall ( Fig. 1 ). FIG. 1 Interior Smooth Wall and an Annular Corrugated Profile Outer Wall 1.4 Units— The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. 1.5 The following precautionary statement caveat pertains only to the test method portion, Section 8 , of this specification. 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.