1.1 本指南旨在确定和定义液化天然气（LNG）船用液化天然气（LNG）燃料箱服务中C型移动式储罐设计、安装和应用的最佳实践的最低要求。 1.2 除IMO IGF规范的要求外，本指南还包括监管合规的必要指南，以及风险评估考虑因素，以详细说明设计、位置、配置、相关安全系统和定期系统检查的标准。安全系统标准包括泄漏/溢出检测和控制、喷水保护、紧急停机、接地要求、固定通风系统的泄压、相关警报和用于系统识别的色码标记。 本指南还将介绍合适的储罐类型及其相关系统的定位和固定，这些系统将确保合规船舶的稳定性，以及紧急响应和船舶出口的关键系统和连接。 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 本指南旨在定义和确定作为液化天然气燃料箱使用的液化天然气燃料船上海上服务C型移动式罐的设计、安装和应用的最低要求的最佳实践。这些最佳实践为IGF规范6.5中的要求提供了更多细节，以促进这些要求的一致和实际实施。

1.1 This guide is intended to identify and define the minimum requirements for the best practices in the design, installation, and application of Type C portable tanks in marine liquefied natural gas (LNG) fuel tank service used on LNG-fueled vessels. 1.2 This guide comprises the necessary guidance for regulatory compliance in addition to the requirements of the IMO IGF Code, along with the risk assessment considerations to detail the criteria for design, location, configuration, associated safety systems, and periodic system inspections. Included in the safety systems criteria would be leakage/spill detection and containment, water spray protection, emergency shutdown, grounding requirements, pressure relief to a fixed venting system, associated alarms, and color code markings for system identification. The locating and securing of suitable tank types with associated systems for marine service that will ensure compliant vessel stability with appropriate access to critical systems and connections for emergency response and vessel egress will also be addressed in this guide. 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 This guide is intended to define and identify best practices for minimum requirements for the design, installation, and application of Type C portable tanks for marine service on LNG fueled vessels for service as a LNG fuel tank. These best practices provide added detail to the requirements in 6.5 of the IGF Code to facilitate consistent and practical implementation of those requirements.