1.1 本规程涵盖了在高于或低于环境温度以及室内和室外位置运行的隔热和隔音管道的铝和不锈钢护套的推荐安装技术。本规程适用于根据规范制造的材料 C1729 （铝护套）或规范 C1767 （不锈钢护套）。它不涉及由其他材料制成的绝缘护套，如胶泥、纤维增强塑料、层压护套、PVC或橡胶或改性沥青护套，也不涉及隔热或隔音系统的细节。 1.2 这种做法的目的是优化已安装金属护套的性能和使用寿命，并最大限度地减少通过金属护套系统的水侵入。本文件仅限于管道尺寸不超过48 in.NPS的管道保温层上的金属护套的安装程序，不包括系统设计。 本规程不包括在矩形管道上或阀门和仪表周围安装金属护套。它不包括在圆柱形绝缘管道上安装螺旋护套，但适用于类似于管道绝缘护套安装的圆柱形绝缘管道的金属护套。指导 C1423 提供了选择护套材料及其安全使用的指导。 1.3 出于本规程的目的，假设铝或不锈钢护套具有覆盖管道或刚性管道上隔热系统所需的正确尺寸，同时实现中规定的纵向重叠 8.2.2 和 8.3.2 实现这种规定的纵向重叠闭合所需的铝或不锈钢护套的尺寸是一个复杂的主题，其详细要求不在本规范的范围内。实现这种配合对整个绝缘系统的性能非常重要。 看见 附录X1 关于安装在热管和刚性管道隔热层上的铝和不锈钢护套的封闭的一般信息和建议。 1.4 在某些情况下，水或水蒸气侵入绝缘系统将导致不期望的结果，例如绝缘下的腐蚀、绝缘能力的丧失以及绝缘系统的物理损坏。最大限度地减少水通过金属护套系统的流动只是帮助保持整个绝缘系统良好长期性能的重要因素之一。还有许多其他重要因素，包括绝缘、蒸汽缓凝剂和绝缘接缝密封剂的正确性能和安装。只有仔细考虑绝缘系统设计的各个方面以及这些方面与预期应用（高温、低温、恶劣环境等）的关系，才能实现最佳的长期绝缘系统性能。 )。本规程仅涉及金属护套的安装，因此总绝缘系统设计不在其范围内。 1.5 以英寸-磅为单位的数值应视为标准。括号中给出的值是国际单位制的数学转换，仅供参考，不被视为标准。 1.6 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，并确定监管限制的适用性。 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。 ===意义和用途====== 5.1 本规程适用于根据规范制造的材料 C1729 （铝护套）或规范 C1767 （不锈钢护套）。本标准旨在提供安装这些类型材料的基本实践。请参阅技术规格 C1729 和 C1767 关于铝和不锈钢护套之间的差异以及每种护套的使用位置的信息。 5.2 本规程并非旨在涵盖与所有应用安装相关的所有方面，包括工厂和现场制造的管道配件盖。 注1: 参考国家商业和工业绝缘标准（MICA）指南 C1696 ，产品制造商和/或项目规范，以获得其他建议。 5.3 金属护套通常用于室外的绝缘管道，包括但不限于工艺区域和屋顶。金属护套用于室内，要求对物理损伤具有更大的抵抗力，以提高外观、防火性能，或作为其他首选。 室外使用的金属护套具有与室内相同的功能，还可以保护绝缘系统免受天气影响。 5.4 金属护套用于所有类型的管道保温材料。

1.1 This practice covers recommended installation techniques for aluminum and stainless steel jacketing for thermal and acoustic pipe insulation operating at either above or below ambient temperatures and in both indoor and outdoor locations. This practice applies to materials manufactured in accordance with Specification C1729 (aluminum jacketing) or Specification C1767 (stainless steel jacketing). It does not address insulation jacketing made from other materials such as mastics, fiber-reinforced plastic, laminate jacketing, PVC, or rubberized or modified asphalt jacketing, nor does it cover the details of thermal or acoustical insulation systems. 1.2 The purpose of this practice is to optimize the performance and longevity of installed metal jacketing and to minimize water intrusion through the metal jacketing system. This document is limited to installation procedures for metal jacketing over pipe insulation up to a pipe size of 48 in. NPS and does not encompass system design. This practice does not cover the installation of metal jacketing on rectangular ducts or around valves and gauges. It excludes the installation of spiral jacketing on cylindrical insulated ducts but is applicable to metal jacketing on cylindrical insulated ducts installed similarly to pipe insulation jacketing. Guide C1423 provides guidance in selecting jacketing materials and their safe use. 1.3 For the purposes of this practice, it is assumed that the aluminum or stainless steel jacketing is of the correct size necessary to cover the thermal insulation system on the pipe or rigid tubing while achieving the longitudinal overlaps specified in 8.2.2 and 8.3.2 . The size of the aluminum or stainless steel jacket necessary to achieve this specified longitudinal overlap closure is a complex topic for which the detailed requirements are outside the scope of this practice. Achieving this fit is very important to the performance of the total insulation system. See Appendix X1 for general information and recommendations regarding this closure of aluminum and stainless steel jacketing installed over thermal pipe and rigid tubing insulation. 1.4 The intrusion of water or water vapor into an insulation system will, in some cases, cause undesirable results such as corrosion under insulation, loss of insulating ability, and physical damage to the insulation system. Minimizing the movement of water through the metal jacketing system is only one of the important factors in helping maintain good long-term performance of the total insulation system. There are many other important factors including proper performance and installation of the insulation, vapor retarder, and insulation joint sealant. Optimum long-term insulation system performance is only achieved by carefully considering all aspects of insulation system design and how these relate to the intended application (hot, cold, cryogenic, severe environment, etc.). This practice only addresses installation of metal jacketing so total insulation system design is outside of its scope. 1.5 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. 1.6 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. 1.7 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. ====== Significance And Use ====== 5.1 This practice applies to materials manufactured in accordance with Specification C1729 (aluminum jacketing) or Specification C1767 (stainless steel jacketing). This standard is intended to provide a basic practice for installing these types of materials. Refer to Specifications C1729 and C1767 for information on the differences between aluminum and stainless steel jacketing and where each is considered for use. 5.2 This practice is not intended to cover all aspects associated with installation for all applications, including factory and field fabricated pipe fitting covers. Note 1: Consult the National Commercial & Industrial Insulation Standards (MICA), Guide C1696 , the product manufacturer, and/or project specifications for additional recommendations. 5.3 Metal jacketing is typically used on insulated piping located outdoors, including, but not limited to, process areas and rooftops. Metal jacketing is used indoors where greater resistance to physical damage is required, for appearance, for improved fire performance, or as otherwise preferred. Metal jacketing used outdoors serves the same functions as indoors and also protects the insulation system from weather. 5.4 Metal jacketing is used over all types of pipe insulation materials.