1.1 本规范涵盖了用于单管组合通风管和重力流应用中未通风的废烟囱的特殊无轮毂铸铁污水管配件。它建立了无轮毂铸铁污水管配件的材料、制造、机械和化学性能、尺寸、涂层、试验方法、检验、认证和产品标记等标准。这些配件适用于非压力应用，在非压力应用中，为卫生、排水和废水系统选择合适的尺寸可为重力排水提供自由的空气空间。 注1: 本标准所涵盖的配件是拟用于工程设计系统的特殊配件，需要获得具有使用管辖权的机构的特别批准。 本标准无意认可或建议在这些特殊应用中使用这些配件。 1.2 本节所示的EDP/ASA编号代表美国供应协会（ASA）采用的统一行业代码。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 本规范涵盖以下样式的配件，并适用于符合本规范中给出的适用要求的任何其他样式。 注2: 本标准的文本引用了提供解释材料的注释和脚注。这些注释和脚注（不包括表和图中的注释）不应视为本标准的要求。 注3: 这些配件的一些销售商使用术语“充气器”和“除气器”配件来描述本标准所涵盖的两种配件。 1.4 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 special hubless cast iron soil pipe fittings for use in a one-pipe combination vent and waste stack unvented for gravity flow applications. It establishes standards covering material, manufacture, mechanical and chemical properties, dimensions, coating, test methods, inspection, certification, and product marking for hubless cast iron soil pipe fittings. These fittings are intended for nonpressure applications, where the selection of the proper size for sanitary, drain, and waste systems allows free air space for gravity drainage. Note 1: The fittings covered by this standard are special fittings intended to be used for engineered designed systems and will require special approval by the authority having jurisdiction for use. It is not the intent of this standard to endorse or recommend the use of these fittings for these special applications. 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 new, special, or transitory, and will be assigned numbers on subsequent prints of this specification. 1.3 This specification covers fittings of the following patterns and applies to any other patterns that conform with the applicable requirements given in this specification. Note 2: The text of this standard references notes and footnotes that provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the standard. Note 3: Some sellers of these fittings use the terms “aerator” and “de-aerator” fittings to describe the two types of fittings covered by this standard. 1.4 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.