ISO 20675:2018定义了在设计、制造、安装、施工、测试、调试过程中，从安全、环境、性能和功能角度出发，通过厌氧消化、生物质气化和生物质源发电制气、沼气调节、沼气升级和沼气利用等相关术语和分类，验收、运行、定期检查和维护阶段。 沼气装置尤其适用于食品和饮料工业、废水处理厂、废物处理厂、垃圾填埋场、农业公司旁边的小型工厂和小型家庭设施等工业工厂。 本文档不包括以下主题: -锅炉、燃烧器、熔炉和照明设备，如果这些设备没有专门用于当地生产的沼气； -车辆和船舶用气体燃料发动机； -公共燃气网； -确定生物甲烷质量的规范； -压缩或液化沼气的运输； -生物质或消化物的运输； -评估和确定生物质是否可持续来源。 ISO 20675:2018还描述了以下信息: -确定尺寸（e）的参数。 g、 小型、中型或大型）； -确定安装类型的参数（例如家用、工业）； -描述技术类型的参数； -以制定沼气设施的健康、安全和环境保护指南。 注:有关范围的解释，请参见附录A。

ISO 20675:2018 defines terms and describes classifications related to biogas production by anaerobic digestion, gasification from biomass and power to gas from biomass sources, biogas conditioning, biogas upgrading and biogas utilization from a safety, environmental, performance and functionality perspective, during the design, manufacturing, installation, construction, testing, commissioning, acceptance, operation, regular inspection and maintenance phases. Biogas installations are, among others, applied at industrial plants like food and beverage industries, waste water treatment plants, waste plants, landfill sites, small scale plants next to agricultural companies and small scale household installations. The following topics are excluded from this document: - boilers, burners, furnaces and lightening, in case these are not specifically applied for locally produced biogas; - gas-fuelled engines for vehicles and ships; - the public gas grid; - specifications to determine biomethane quality; - transportation of compressed or liquefied biogas; - transportation of biomass or digestate; - assessment and determination whether biomass is sourced sustainably or not. ISO 20675:2018 describes the following for information purposes as well: - the parameters to determine the size (e.g. small, medium-sized, or large scale); - the parameters to determine the type of installation (e.g. domestic, industrial); - the parameters to describe the type of technique; - terms and processes in order to develop health, safety and environmental protection guidelines for biogas installations. NOTE For an explanation of the Scope, see Annex A.