8 1 2015 BRG PREMANT district heating pipe PRE Subject to technical changes Pressure drop chart 6 200 Fl ow ra te m kg h 1000000 500000 400000 300000 200000 100000 50000 40000 30000 20000 10000 5000 4000 3000 2000 1000 500 400 5 50 100 10 200 300 500 1000 2000 3000 5000 20 30 50 100 200 300 500 Pa m 2 8 m s 2 4 m s2 0 m s 1 8 m s 1 6 m s 1 4 m s 1 2 m s 1 0 m s0 8 m s0 6 m s0 5 m s0 4 m s 21 6 mm DN 20 29 1 mm DN 25 37 2 mm DN 32 43 1 mm DN 40 54 5 mm DN 50 70 3 mm DN 65 82 5 mm DN 80 107 1 mm DN 100 132 5 mm DN 125 160 3 mm DN 150 mm WS m Pressure loss p Water temperature 80 C Surface roughness e 0 045 mm 1 mmWS 9 81 Pa Q 860m T m Flow rate in kg h Q Power requirement in kW T Temperature difference VL flow RL return in C 344 4 mm DN 350 312 7 mm DN 300 263 0 mm DN 250 210 1 mm DN 200 W ater velocity 3 6 m s 3 2 m s

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