本标准实施规程规定了根据一个或多个规定的AWWA标准制造的新美国水务工程协会（AWWA）阀门修改的最低要求，这些阀门需要修改，以满足水务工程应用中使用的特定最终用户要求。MSS SP-153旨在确保工艺和材料质量符合所有适用标准和规范。本文件中包含的程序是一般性的，执行修改的工厂可能需要根据需要对其进行补充，以符合所有适用规范和标准。本标准实施规程的内容包括术语和定义、总体修改要求、标记、可追溯性、组装、拆卸和储存要求；除了特定的修改、评估和测试程序。目的:本标准惯例旨在确保工艺和材料质量符合所有适用标准和规范。 范围:本标准实施规程规定了根据以下一个或多个AWWA标准制造的新美国水务工程协会（AWWA）阀门修改的最低要求，这些阀门需要修改，以满足水务工程应用中使用的特定最终用户要求。与本标准实践相关的特定AWWA标准包括:C507、球阀C504和C516、蝶阀C5500、C509和C515、闸阀C520、刀闸阀C517、，旋塞阀本标准实施规程中包含的程序在本质上是通用的，执行修改的设施可能需要根据需要对其进行补充，以符合所有适用规范和标准。

This Standard Practice establishes minimum requirements for the modification of new American Water Works Association (AWWA) valves manufactured in accordance with one or more of the stated AWWA standards, and that require modification to meet specific end user requirements for use in water works applications. MSS SP-153 was developed to ensure that the quality of workmanship and materials meet all applicable standards and codes. The procedures contained within this document are general in nature and the facility performing the modification(s) may need to augment them as necessary to achieve compliance with all applicable codes and standards. The contents of this Standard Practice include terms and definitions, overall modification requirements, marking, traceability, assembly, disassembly, and storage requirements; in addition to specific modification, evaluation, and testing procedures.Purpose:The purpose of this Standard Practice is to ensure that the quality of workmanship and materials meet all applicable standards and codes.Scope:This Standard Practice establishes minimum requirements for the modification of new American Water Works Association (AWWA) valves manufactured in accordance with one or more of the following AWWA standards, and that require modification to meet specific end user requirements for use in water works applications. Specific AWWA standards, pertaining to this Standard Practice, include:C507, Ball ValveC504 and C516, Butterfly ValveC500, C509, and C515, Gate ValveC520, Knife Gate ValveC517, Plug ValveThe procedures contained within this Standard Practice are general in nature and the facility performing the modification(s) may need to augment them as necessary to achieve compliance with all applicable codes and standards.