本标准适用于NPS-2及以下尺寸的管道废水配件。本标准不适用于:（a）ASME A112.18.1/CSA B125.1中规定的管道供应配件；（b） CSA B125.3或其他管道产品标准所涵盖的其他装置（例如，温度驱动在线混合阀）；和（c）ASME A112.18.6/CSA B125.6中涵盖的连续压力下的挠性水连接器。本标准不包括存水弯下游的管道和管件或管道和管件。A112.18.2将与ASME A112系列其他卷中描述的部件一起使用。 仔细应用这些A112标准将有助于用户遵守相关法规，包括来自统一管道规范（UPC）和国际管道规范（IPC）的法规，同时实现从这些卷中详述的许多行业最佳实践中获得的操作和安全效益加强水资源保护，遵守司法法规以及政府和其他监管机构。

This Standard covers plumbing waste fittings of sizes NPS-2 and smaller.This Standard does not cover:(a) plumbing supply fittings, which are covered by ASME A112.18.1/CSA B125.1;(b) other devices (e.g., temperature-actuated in-line mixing valves), which are covered by CSA B125.3 or other plumbing product standards; and(c) flexible water connectors under continuous pressure, which are covered by ASME A112.18.6/CSA B125.6.This Standard does not cover pipes and tubes or pipe and tube fittings that are downstream of the trap.A112.18.2 is to be used in conjunction with components described in other volumes of the ASME A112 series.Careful application of these A112 standards will help users to comply with pertinent regulations—including those derived from the Uniform Plumbing Code (UPC) and the International Plumbing Code (IPC)—while achieving the operational and safety benefits to be gained from the many industry best-practices detailed within these volumes.Intended formanufacturers of plumbing materials and equipment to enhance water conservation and comply with jurisdictional regulation, plus governmental and other regulatory bodies.