1.1 本指南专门介绍了用于修复凿槽、穿孔或孔洞以及加固聚乙烯塑料管的全环绕式带箍的设计和安装。提供了在尺寸为2英寸的管道中选择和使用夹具的指南。标称（60 mm）及以上。 1.1.1 还为用户提供了一种测试方法，以评估维修夹的适用性。在适当的情况下，这种类型的夹具提供了一种方便、有效和安全的方法来恢复在役管道的完整性，而无需切断一段管道（请参阅 注1 ). 待修复的管道不能由加强筋支撑，以进行内部支撑和横截面尺寸控制。这种类型夹具的满意使用应取决于管道本身的抗压性和保持交叉的配件设计概念- 分段管道配置，同时最小化获得有效泄漏密封所需的压缩力。 注1: 应通过使用本指南中包含的信息，并通过咨询管道和夹具制造商以及他们的建议来确定使用此类夹具的适当性。使用此类夹具的基本前提是，制造商建议将其用于该特定应用，并且该应用可提供分步安装说明。由于设计用于塑料管时遇到的物理限制，因此在开发此类夹具时，必须进行原型测试以评估性能预期。 1.2 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 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====== 4.1 仅当管道能够保持其结构完整性时，建议使用全环绕式带箍进行维修。如果在预期的现场条件下，损坏可能扩展到夹具外部，则不建议将这些夹具用于管道的永久性维修（参见 5.1.1 对于维修限制）。在这种情况下，建议切断损坏的管道，并用新件更换。用于维修的夹具应符合制造商的使用规范，并应遵循制造商的安装说明。 4.2 这些夹具可用于覆盖废弃服务管线连接、清洗点和意外穿孔留下的管道孔。 4.3 这些夹具可用于加固因凿痕或其他不规则性导致壁厚减少的管道。 4.4 一些用户在聚乙烯管被挤出后对其进行加固，以预防挤出过程中可能发生的管道损坏，并确保管道不会在同一位置再次被挤出。咨询聚乙烯管制造商，了解其产品挤压的适当性，以及建议加固的情况。请参阅指南 F1041 .

1.1 This guide specifically addresses the design and installation of full-encirclement-type band clamps for repair of gouges, punctures, or holes, and for reinforcement of polyethylene plastic pipe. Guidelines are provided for selecting and using clamps in pipe sizes 2 in. nominal (60 mm) and larger. 1.1.1 A test method is also provided for the user to assess the applicability of the repair clamp. Under appropriate circumstances, this type of clamp offers a convenient, effective, and safe means of restoring the integrity of an in-service pipeline, without cutting out a section of pipe (see Note 1 ). The pipe to be repaired cannot be backed by a stiffener for internal support and cross-sectional dimensional control. Satisfactory use of this type of clamp should rely on the crush resistance of the pipe itself and a fitting design concept, which retains the cross-sectional pipe configuration while minimizing compressive forces required to obtain an effective leakage seal. Note 1: The appropriateness for use of this type of clamp should be determined by using the information contained in this guide and from consultation with, and recommendations of, both the pipe and clamp manufacturers. The basic premise for use of this type of clamp is that it is recommended by the manufacturer for this specific application and that step-by-step installation instructions are available for that application. It is important in the development of this type of clamp that prototype testing be conducted to evaluate performance expectations because of the physical limitations encountered when designing it for use with plastic pipe. 1.2 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 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 ====== 4.1 Full-encirclement-type band clamps are recommended for repairs only where the pipe is able to maintain its structural integrity. These clamps are not recommended for permanent repair of pipe where the damage could propagate outside the clamp under anticipated field conditions (see 5.1.1 for repair limitations). In such situations, it is recommended to cut out and replace the damaged pipe with a new piece. Clamps that are used for repair should comply with the manufacturer’s specifications for use and the manufacturer’s installation instructions should be followed. 4.2 These clamps may be used to cover holes left in the pipe from abandoned service line connections, purge points, and accidental punctures. 4.3 These clamps may be used to reinforce the pipe where the wall thickness has been reduced because of gouges or other irregularities. 4.4 Some users reinforce polyethylene pipe after it has been squeezed-off as a precaution against pipe damage that may have occurred during the squeeze-off process and as a means of ensuring that the pipe will not be squeezed-off again at the same location. Consult with the polyethylene pipe manufacturer as to the appropriateness of squeeze-off for their product, and for circumstances when reinforcement is recommended. See Guide F1041 .