1.1 该实践涉及基材制备和底漆、硬质泡沫聚氨酯系统的选择以及户外服务设备的保护性绝缘涂层。 注1: 就本实践而言，聚氨酯的定义是指聚氨酯或聚异氰脲酸酯，下文称为“PUR/PIR” 1.2 以英寸磅为单位给出的数值应视为标准。括号中给出的值仅供参考。 1.3 本标准可能涉及危险材料、操作和设备。 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。 1.4 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====== 4.1 这种做法有助于选择和应用绝缘系统，以便在 − 30和 + 107°C（−22和 + 225°F）。尽管喷涂PUR/PIR的成功安装受到许多因素的影响，但这种做法处理了四个重要领域: (1) 基质制备， (2) 基底底漆， (3) 绝缘应用，以及 (4) 保护涂层。 4.2 喷砂、底漆应用、绝缘喷涂和保护涂层应用都会对作业现场造成独特的健康和安全危害，并将在各自的标题下进行更详细的处理。

1.1 This practice concerns itself with the substrate preparation and priming, the selection of the rigid cellular polyurethane system, and the protective insulation coatings for outdoor service equipment. Note 1: For the purpose of this practice, polyurethane is defined to mean either polyurethane or polyisocyanurate and is hereafter referred to as “PUR/PIR.” 1.2 The values given in inch-pound are to be regarded as the standard. The values given in parentheses are for information only. 1.3 This standard may involve hazardous materials, operations, and equipment. 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 practice facilitates the selection and application of an insulation system for use at service temperatures between − 30 and + 107°C (−22 and + 225°F). Although the successful installation of spray-applied PUR/PIR is influenced by many factors, this practice treats those four areas found to be of major importance: (1) Substrate preparation, (2) Substrate priming, (3) Insulation application, and (4) Protective coatings. 4.2 Abrasive blasting, primer application, spray application of the insulation, and protective coating application each contribute their unique health and safety hazards to the job site and will be dealt with in more detail under their respective headings.