本出版物为设计、安装和维护氢气排放系统的人员提供信息。本出版物提供了用户现场气态和液态氢系统中使用的氢气排气系统的设计指南，并提供了这些排气系统安全操作的建议。它从控制氢气释放的安全装置和其他部件的排放口开始，在大气中的氢气浓度低于可燃下限时结束。它还提供有关压缩氢、低温液态氢和相关产品的生产、运输、处理和储存的信息。有关氢的更多信息，请参见CGA G-5，氢，CGA G- 5.4，用户场所氢气管道系统标准，CGA压缩气体手册，NFPA 55，压缩气体和低温流体规范，NFPA 2，氢气技术规范。49 CFR中美国运输部（DOT）要求的气瓶和管道拖车的减压装置（PRD）不在本出版物的范围内。

This publication provides information for personnel who design, install, and maintain hydrogen vent systems.This publication provides design guidelines for hydrogen vent systems used in gaseous and liquid hydrogen systems at user sites and provides recommendations for safe operation of these vents. It begins at the discharge port of safety devices and other components that control the release of hydrogen and ends at the point where hydrogen concentration in the atmosphere is below the lower flammable limits.It also provides information on the production, transportation, handling, and storage of compressed hydrogen, cryogenic liquid hydrogen, and related products. Additional information on hydrogen can be found in CGA G-5, Hydrogen, CGA G-5.4, Standard for Hydrogen Piping Systems at User Locations, CGA Handbook of Compressed Gases, and NFPA 55, Compressed Gases and Cryogenic Fluids Code, and NFPA 2, Hydrogen Technologies Code.Pressure relief devices (PRDs) for cylinders and tube trailers required by U.S. Department of Transportation (DOT) in 49 CFR are not covered in the scope of this publication.