EN 12007-4:2000 Gas Supply Systems - Pipelines for Maximum Operating Pressure up to and Including 16 Bar - Part 4: Specific Functional Recommendations for Renovation
2012EN 12007-4:2012 Gas infrastructure - Pipelines for maximum operating pressure up to and including 16 bar - Part 4: Specific functional requirements for renovation
2000EN 12007-4:2000 Gas Supply Systems - Pipelines for Maximum Operating Pressure up to and Including 16 Bar - Part 4: Specific Functional Recommendations for Renovation