Plastics piping systems for the supply of gaseous fuels. Unplasticized polyamide (PA-U) piping systems with fusion jointing and mechanical jointing - Code of practice for design, handling and installation Ingestion-build-111333 The items shall be considered

The items shall be considered to comply with this standard if they comply with the property requirements listed in tables 3 and 4

These retaining rings are used only when EN 3384 cannot be used for installation problems

BS EN 12094-2 on non-electrical automatic control and delay devices is useful for:

sludges or other environmental samples by determining the production of biogas (carbon dioxide and methane) from the anaerobic digestion of sewage sludge over periods of up to 3 days

including diffusive catalytic combustion heaters

Plastics piping systems for the supply of gaseous fuels. Unplasticized polyamide (PA-U) piping systems with fusion jointing and mechanical jointing - Code of practice for design, handling and installation Ingestion-build-111333 The items shall be considered