1.1 本规范 2. 包括NPS中的无缝焊接黑色热浸镀锌钢管 1. / 8. 至NPS 26【DN 6至DN 650】( 注1 )，包括在内，具有标称壁厚( 注2 )如中所示 表X2.2 和 表X2.3 .允许提供其他尺寸的管道，前提是此类管道符合本规范的所有其他要求。提供了可选性质的补充要求，只有在买方规定时才适用。 注1: 无量纲指示符NPS（公称管道尺寸）[DN（公称直径）]在本规范中已被替换为“公称直径”、“尺寸”和“公称尺寸”等传统术语。 ” 注2: 标称壁厚一词是为了方便命名而指定的，仅存在于名称中，用于将其与实际壁厚区分开来，实际壁厚可能在标称壁厚之上或之下变化。 1.2 本规范涵盖以下类型和等级: 1.2.1 F型-- 炉对焊、连续焊接A级和B级， 1.2.2 E型-- 电阻焊接，A级和B级，以及 1.2.3 S型-- 无缝，A级和B级。 注3: 看见 附录X1 用于管道类型的定义。 1.3 根据本规范订购的管道适用于机械和压力应用，也可用于蒸汽、水、天然气和空气管线的普通用途。 它适用于焊接，也适用于包括卷取、弯曲和翻边在内的成型操作，但须符合以下条件: 1.3.1 F型不适用于翻边。 1.3.2 当管道需要进行紧密盘绕或冷弯时，首选A级；然而，这并不是为了禁止B级管道的冷弯。 1.3.3 E型由制造商选择非膨胀型或冷膨胀型。 1.4 以国际单位制或英寸磅单位表示的数值应单独视为标准。每个系统中规定的值可能不是完全相等的； 因此，每个系统应独立使用。将两个系统的值合并可能导致不符合标准。 1.5 以下注意事项仅适用于试验方法部分，第节 7. , 8. , 9 , 13 , 14 和 15 本规范的: 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前制定适当的安全、健康和环境实践，并确定监管要求的适用性。 1.6 本规范的文本包含注释或脚注，或两者兼而有之，以提供解释性材料。 除表和图中的注释和脚注外，这些注释和脚注不包含任何强制性要求。 1.7 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》中确立的国际公认的标准化原则制定的。

1.1 This specification 2 covers seamless and welded black and hot-dipped galvanized steel pipe in NPS 1 / 8 to NPS 26 [DN 6 to DN 650] ( Note 1 ), inclusive, with nominal wall thickness ( Note 2 ) as given in Table X2.2 and Table X2.3 . It shall be permissible to furnish pipe having other dimensions provided that such pipe complies with all other requirements of this specification. Supplementary requirements of an optional nature are provided and shall apply only when specified by the purchaser. Note 1: The dimensionless designators NPS (nominal pipe size) [DN (diameter nominal)] have been substituted in this specification for such traditional terms as “nominal diameter,” “size,” and “nominal size.” Note 2: The term nominal wall thickness has been assigned for the purpose of convenient designation, existing in name only, and is used to distinguish it from the actual wall thickness, which may vary over or under the nominal wall thickness. 1.2 This specification covers the following types and grades: 1.2.1 Type F— Furnace-butt-welded, continuous welded Grades A and B, 1.2.2 Type E— Electric-resistance-welded, Grades A and B, and 1.2.3 Type S— Seamless, Grades A and B. Note 3: See Appendix X1 for definitions of types of pipe. 1.3 Pipe ordered under this specification is intended for mechanical and pressure applications and is also acceptable for ordinary uses in steam, water, gas, and air lines. It is suitable for welding, and suitable for forming operations involving coiling, bending, and flanging, subject to the following qualifications: 1.3.1 Type F is not intended for flanging. 1.3.2 When pipe is required for close coiling or cold bending, Grade A is the preferred grade; however, this is not intended to prohibit the cold bending of Grade B pipe. 1.3.3 Type E is furnished either nonexpanded or cold expanded at the option of the manufacturer. 1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. 1.5 The following precautionary caveat pertains only to the test method portion, Sections 7 , 8 , 9 , 13 , 14 , and 15 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 requirements prior to use. 1.6 The text of this specification contains notes or footnotes, or both, that provide explanatory material. Such notes and footnotes, excluding those in tables and figures, do not contain any mandatory requirements. 1.7 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.