1.1 本规范涵盖NPS 1/2至NPS 10（含）的黑色热浸镀锌焊接无缝钢管[DN 15至DN 250（含）]( 注1 )，壁厚如中所示 表1 和 表2 . 可提供具有其他壁厚的管道，前提是此类管道符合本规范的所有其他要求，并且外径如所示 表2 . 根据本规范订购的管道拟用于消防系统。管道可以弯曲，但不适用于在环境温度下弯曲，其中弯曲内径小于被弯曲管道外径的12倍( 注释2 ). 注1: 本标准用无量纲指示符NPS（标称管道尺寸）和DN（标称直径）代替了“标称直径”、“尺寸”和“标称尺寸”等传统术语 注2: 管道的成功弯曲取决于设备和技术以及管道性能。 1.2 该管道适合通过以下方法连接: 1.2.1 轻型消防管- 平端管的轧制坡口、焊接和配件。看见 表1 对于尺寸。 1.2.2 标准重量消防管- 平端管的切割或轧制坡口、螺纹、焊接和配件。 看见 表2 对于尺寸。 1.2.3 对于尺寸不同于以下尺寸的管道: 表1 和 表2 ，连接方法必须与管道尺寸兼容。ASME B36.10和B36.19中列出了标准轻质尺寸的完整列表。 1.3 以国际单位制或英寸-磅单位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，每个系统应相互独立使用。将两个系统的值合并可能会导致- 符合标准。 1.4 以下安全危险警告仅适用于试验方法部分，章节 8. , 9 和 10 ，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。 1.5 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 black and hot-dipped galvanized welded and seamless steel pipe in NPS 1/2 to NPS 10, inclusive [DN 15 to DN 250, inclusive] ( Note 1 ), with wall thicknesses as given in Table 1 and Table 2 . Pipe having other wall thicknesses may be furnished provided such pipe complies with all other requirements of this specification and the outside diameter is as given in Table 2 . Pipe ordered under this specification is intended for use in fire protection systems. The pipe may be bent, but it is not intended for bending made at ambient temperature wherein the inside diameter of the bend is less than twelve times the outside diameter of the pipe being bent ( Note 2 ). Note 1: The dimensionless designators NPS (nominal pipe size) and DN (nominal diameter) have been substituted in this standard for such traditional terms as “nominal diameter,” “size,” and “nominal size.” Note 2: Successful bending of pipe is a function of equipment and technique as well as pipe properties. 1.2 This pipe is suitable for joining by the following methods: 1.2.1 Light-Weight Fire Protection Pipe— Rolled groove, welding, and fittings for plain end pipe. See Table 1 for dimensions. 1.2.2 Standard-Weight Fire Protection Pipe— Cut or rolled groove, threading, welding, and fittings for plain end pipe. See Table 2 for dimensions. 1.2.3 For pipe having dimensions other than those of Table 1 and Table 2 , the joining method must be compatible with the pipe dimensions. A complete listing of standard light weight dimensions appears in ASME B36.10 and B36.19. 1.3 The values stated in either SI units or inch-pound 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 result in non-conformance with the standard. 1.4 The following safety hazards caveat pertains only to the test method portion, Sections 8 , 9 , and 10 , 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. 1.5 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.