1.1 本规范规定了微咸水或海水管道系统中使用的电弧焊管道的要求。 1.2 单位- 以英寸-磅为单位的数值应视为标准值。括号中给出的值是到国际单位制的数学转换，仅供参考，不被视为标准值。 1.3 以下危险声明仅适用于 8.2 和 14.3.2 本规范: 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.4 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。 ====意义和用途====== 16.1 为了确定是否符合下表所列特性要求的规定限值，应按照实践中的舍入方法对观察值或计算值进行舍入 E29年 . 所有物 观察值或计算值的舍入单位 化学成分 最后一个右手边最近的单位 用于表示的有效数字 极限值 抗拉强度 最近ksi（5 MPa）

1.1 This specification establishes the requirements for arc-welded pipe for use in brackish water or seawater piping systems. 1.2 Units— 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. 1.3 The following hazard statement pertains only to the test method described in 8.2 and 14.3.2 of this specification: This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 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. ====== Significance And Use ====== 16.1 For purposes of determining compliance with the specified limits for requirements of the properties listed in the following table, an observed value or a calculated value shall be rounded as indicated in accordance with the rounding method of Practice E29 . Property Rounded Unit for Observed or Calculated Value Chemical composition nearest unit in the last right-hand significant digit used in expressing the limiting value Tensile strength nearest ksi (5 MPa)