1.1 本规范规定了用于液化天然气（LNG）燃料船舶应用的低温管道和设备的隔热系统的设计要求。还详细介绍了安装方法和材料，包括护套和蒸汽缓凝剂。 1.2 本规范所述的管道和设备工作温度范围是从不高于-259°F（–162°C）的温度到所有较低的温度。 1.3 这些类型的管道系统通常具有较小的直径:3英寸。（80 mm）NPS及以下。然而，本规范不限于如此小的管道。 1.4 本规范未涉及液化天然气燃料箱或工厂安装的预冷器的隔热- 绝缘管道绝缘组件。 1.5 本规范未涉及可拆卸/可重复使用绝缘系统的设计。 1.6 本规范未涉及绝缘系统的结构设计和物理强度。然而，对护套系统的固定进行了讨论。 1.7 对于上述不输送液化天然气的环境管道和设备，请参阅实践 F683 用于绝缘实践。 1.8 绝缘系统重量不是本规范中考虑的设计标准。 1.9 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。 1.10 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。 1.11 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 provides requirements for the design of thermal insulation systems for cryogenic piping and equipment for liquefied natural gas (LNG)-fueled ship applications. Methods and materials for installation, including jacketing and vapor retarders, are also detailed. 1.2 The pipe and equipment operating temperature range addressed by this specification is from a temperature no warmer than –259°F (–162°C) to all temperatures colder. 1.3 These types of piping systems typically have a small diameter: 3 in. (80 mm) NPS and smaller. However, this specification is not limited to pipes that small. 1.4 This specification does not address the thermal insulation on either LNG fuel tanks or factory installed, pre-insulated pipe insulation assemblies. 1.5 The design of removable/reusable insulation systems is not addressed in this specification. 1.6 Structural design and physical strength of insulation systems are not addressed in this specification. However, the securement of jacketing systems is addressed. 1.7 For above ambient pipe and equipment not carrying LNG, see Practice F683 for insulation practices. 1.8 Insulation system weight is not a design criterion considered in this specification. 1.9 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. 1.10 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. 1.11 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.