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DIN EN 806-3:2006
Specifications for installations inside buildings conveying water for human consumption - Part 3: Pipe sizing - Simplified method; German version EN 806-3:2006
This standard is in conjunction with EN 806-1 and EN 806-2 for drinking water systems within premises. It contains no pipe sizing for fire fighting systems (see EN 806-2, clause 21).
Deutsches Institut für Normung [din]