1.1 本规范涵盖两种类型，无缝钢管和电阻焊钢管，用作NPS 4至NPS 12[DN 100至DN 300]中高压管式电缆安装的导管，标称（平均）壁厚为0.219至0.562英寸。[5.56至14.27 mm]，取决于尺寸。具有其他尺寸的管道( 注释2 )可提供，前提是此类管道符合本规范的所有其他要求。 注1: 本标准用无量纲指示符NPS（标称管道尺寸）代替了“标称直径”、“尺寸”和“标称尺寸”等传统术语 注2: ASME B36.10中包含标准化管道尺寸的综合列表。 1.2 根据本规范订购的管道适用于焊接和涉及扩口、起拱和弯曲的成型操作。 1.3 为此目的提供的管道应为采购订单中规定的A级或B级。 A级更适用于涉及弯曲、扩口或起拱的成形操作，通常首选该级。本规定无意禁止B级管道的冷弯、扩口或起拱。 1.4 本规范以英寸-磅单位和国际单位制表示；但是，除非采购订单或合同规定了适用的M规格名称（国际单位制），否则英寸-磅单位应适用。以英寸-磅或国际单位制表示的数值应单独视为标准值。在文本中，国际单位显示在括号中。每个系统中规定的值可能不是精确的等效值；因此，每个系统应独立使用。将两个系统的值结合起来可能会导致不符合标准。 1.5 以下危险警告适用于试验方法部分第节 20 ，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。 1.6 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。

1.1 This specification covers two types, seamless (S) and electric-resistance-welded (E), of steel pipe used as conduit for the installation of high-pressure pipe-type electrical cables in NPS 4 to NPS 12 [DN 100 to DN 300], inclusive, with nominal (average) wall thicknesses 0.219 to 0.562 in. [5.56 to 14.27 mm], depending on size. Pipe having other dimensions ( Note 2 ) may be furnished, provided such pipe complies with all other requirements of this specification. Note 1: The dimensionless designator NPS (nominal pipe size) has been substituted in this standard for such traditional terms as “nominal diameter,” “size,” and “nominal size.” Note 2: A comprehensive listing of standardized pipe dimensions is contained in ASME B36.10. 1.2 Pipe ordered under this specification is suitable for welding and for forming operations involving flaring, belling, and bending. 1.3 Pipe for this purpose shall be furnished in Grade A or Grade B as specified in the purchase order. Grade A is more suitable for forming operations involving bending, flaring, or belling and this grade is normally preferred. This provision is not intended to prohibit the cold bending, flaring, or belling of Grade B pipe. 1.4 This specification is expressed in both inch-pound units and in SI units; however, unless the purchase order or contract specifies the applicable M specification designation (SI units), the inch-pound units shall apply. The values stated in either inch-pound or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. 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 results in nonconformance with the standard. 1.5 The following hazard caveat applies to the test method portion, Section 20 , 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. 1.6 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.