How do we calculate?
EN 806-3 simplified method: the loading units (LU) of all fixtures are summed (washbasin and cistern 1, shower, sink and machines 2, bath 4, garden tap 5 LU; 1 LU = 0.1 L/s). According to the galvanized steel pipe table, DN15 carries at most 6 LU, DN20 16 LU, DN25 40 LU, DN32 160 LU, DN40 300 LU, DN50 600 LU, DN65 1600 LU; no single fixture larger than 4 LU is connected to DN15.
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