This document applies for systems for biogas production by anaerobic digestion, 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. The following topics are excluded from this document: boilers, burners, furnaces and lighting 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. An informative explanation of the scope is included in Annex A.