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Tubes CD: VCD flow = 42.09 l / s, choose Δp1 = 900 Pa / m, from the graph the pressure loss in the black steel pipes, we find the diameter d1 = 125 mm, from the table black steel pipe sold in the market we choose d1t = 154.05 mm (nominal diameter 152.4 mm). from which we find pressure losses carried Δp1t = 300 pa / m, speed of ω1t = 1.9 m / s
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