1.1 本规范涵盖带橡胶垫圈接头的无钢筋混凝土管，用于在工作压力下输送灌溉水，包括水力瞬变，如所示 表1 . 1.2 规范的完整公制配套 C505型 已开发- C505M ; 因此，本规范中未提供SI等效物。 注1: 本规范仅用于制造和采购，不包括垫层、回填、安装或现场维修的要求。 业主应注意，他必须将现场条件与指定管道的特性相关联，并在安装过程中进行检查。 1.3 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 nonreinforced concrete pipe with rubber gasket joints to be used for the conveyance of irrigation water with working pressures, including hydraulic transients, as shown in Table 1 . 1.2 A complete metric companion to Specification C505 has been developed— C505M ; therefore, no SI equivalents are presented in this specification. Note 1: This specification is for manufacturing and purchase only and does not include requirements for bedding, backfill, installation, or field repairs. The owner is cautioned that he must correlate field conditions with the characteristics of the pipe specified and provide inspection during installation. 1.3 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.