This document applies for biogas production systems 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. This standards cover institutional biogas systems with capacity range of 10kW/day – 20kW/day. 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.