本标准旨在规定API石油测量标准手册（MPMS）第19.3章A至E部分中测试方法的使用要求，以确定浮顶边缘密封件、甲板配件和甲板接缝（以下简称浮顶装置）的蒸发损失系数。本标准说明了如何将API MPMS Ch.19.3系列的其他标准集成到整体损耗因子开发程序中，以使用户能够开发给定浮点数的损耗因子- 车顶装置。本标准介绍了在此类计划下进行评估的程序，包括准备单个设备的协议测试、监测测试以及分析和报告测试结果，以确定蒸发损失系数。MPMS第19.3章系列标准中给出的损耗因子开发计划的目的不是指定浮顶装置设计、制造或现场安装中使用的程序。 此外，不能仅基于蒸发损失考虑来选择设备。在为特定应用设计和选择储罐设备时，许多其他因素（如储罐操作、维护和安全）都很重要。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。本标准的用户有责任在使用前制定适当的安全和健康实践，并确定监管限制的适用性。

The purpose of this standard is to specify requirements for the use of the test methods in API's Manual of Petroleum Measurement Standards (MPMS), Ch. 19.3, Parts A through E to develop evaporative loss factors for floating-roof rim seals, deck fittings, and deck seams (hereinafter referred to as floating-roof devices).This standard illustrates how other standards of the API MPMS Ch. 19.3 series are integrated into an overall loss factor development program to enable the user to develop a loss factor for a given floating-roof device. This standard presents procedures for the evaluations to be performed under such a program, including preparation for protocol testing of individual devices, monitoring of the tests, and analysis and reporting of test results for the purposes of establishing evaporative loss factors.It is not the purpose of this loss factor development program as given in the MPMS Ch. 19.3 series of standards to specify procedures to be used in the design, manufacture, or field installation of floating-roof devices. Furthermore, equipment cannot necessarily be selected for use solely on the basis of evaporative-loss considerations. Many other factors-such as tank operation, maintenance, and safety-are important in designing and selecting tankequipment for a given application.This standard may involve hazardous materials, operations, and equipment. This standard does not purport to address all of the safety problems associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.