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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.