1.1本规范涵盖了在82°C（180°F）下最大压力额定值为1000 kPa（145 psi）的热水和冷水饮用水系统的2型多层管和压缩管件的要求。 注1- 多层管类型2 -基于结构的额定压力管道，包括一层以上，其中至少60%的壁厚为聚合物材料。 1.2 2 2型多层管采用对焊铝管作为芯材，挤出交联聚乙烯（PEX）内层。粘合层用于将内层粘合到铝管的壁上。聚乙烯（PE）外层和粘合层被挤压到铝管的外壁。 1.3 2型多层管以配置1和2生产，如图1所示。 1.4本规范包括压缩配件，如图2所示。 1.5与符合本规范要求的管道和配件一起使用的螺纹或焊接适配器的规范见附录A1和附录A2。 1.6以下预防性警告仅适用于本规范的试验方法部分: 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和健康实践，并确定监管限制的适用性。 1.7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。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不符合标准。

1.1 This specification covers requirements for multilayer pipe type 2 and compression fittings for hot and cold drinking-water systems, with a maximum pressure rating of 1000 kPa (145 psi) at 82°C (180°F). Note 1— Multilayer Pipe Type 2 —Construction-based pressure rated pipe comprising more than one layer in which at least 60 % of the wall thickness is polymeric material. 1.2 Multilayer pipe type 2 is produced using a butt-welded aluminum pipe as a core, with an extruded inside layer of crosslinked polyethylene (PEX). An adhesive layer is used to bond the inside layer to the wall of the aluminum pipe. An outer layer of polyethylene (PE) and an adhesive layer are extruded to the outer wall of the aluminum pipe. 1.3 Multilayer pipe type 2 is produced in configurations 1 and 2, as referenced in Fig 1. 1.4 This specification includes compression fittings, which are referenced in Fig 2. 1.5 Specifications for thread or solder adapters for use with pipe and fittings meeting the requirements of this specification are given in Annex A1 and Annex A2. 1.6 The following precautionary caveat pertains only to the test method portion 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 and health practices and determine the applicability of regulatory limitations prior to use. 1.7 The values stated in either SI units or in 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 nonconformance with the standard.