1.1 本规范涵盖用于重力流管道排水、废水和通风卫生应用的铸铁污厕法兰。它为壁橱法兰制定了涵盖材料、制造、机械和化学性能、涂层、试验方法、检验、认证、产品标记、尺寸和尺寸公差的标准。这些壁橱法兰不适用于压力应用，因为为卫生排水、废水、通风和雨水排水系统选择合适的尺寸可为重力排水提供自由空气空间 1.2 本节所示的EDP/ASA编号代表美国供应协会（ASA）采用的统一行业规范。组名称前缀022被分配给无轮毂产品，随后是分配给单个项目的四位标识和校验位。 该系统旨在通过分销渠道促进EDP控制，并将普遍用于订购和指定产品项目。没有EDP编号的项目是新的、特殊的或临时的，将在本规范的后续印刷品上指定编号。 1.3 本规范涵盖以下类型的壁橱法兰( 7.1.1 )当如此指定时，应适用于符合本规范中给出的适用要求的任何其他模式。 1.4 以英寸-磅单位表示的数值应视为标准值。括号中给出的数值是国际单位制的数学转换，仅供参考，不被视为标准。 1.5 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》中确立的国际公认标准化原则制定的。

1.1 This specification covers cast iron soil closet flanges for use in gravity flow plumbing drain, waste, and vent sanitary applications. It establishes standards covering material, manufacture, mechanical and chemical properties, coating, test methods, inspection, certification, product markings, dimensions, and dimensional tolerances for closet flanges. These closet flanges are not intended for pressure applications, as the selection of the proper size for sanitary drain, waste, vent, and storm drain systems allows free air space for gravity drainage 1.2 The EDP/ASA numbers indicated in this section represent a Uniform Industry Code adopted by the American Supply Association (ASA). A group designation prefix, 022, is assigned to hubless products followed by the four-digit identification assigned to individual items and a check digit. This system has been instituted to facilitate EDP control through distribution channels, and is to be used universally in ordering and specifying product items. Those items with no EDP numbers are either new, special, or transitory and will be assigned numbers on subsequent prints of this specification. 1.3 This specification covers closet flanges of the following patterns ( 7.1.1 ) and, when so designated, shall apply to any other patterns that conform with the applicable requirements given in this specification. 1.4 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. 1.5 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.