1、Equivalent lenghtsBends/Tees180 bend, R=5D 2890 bend, R=5D 1690 bend (square , R=1.5D) 2045 bend(square , R=1.5D) 16Tee (flow straight through) 20Tee (flow through side outlet) 65Gates/ValvesGate valve open 13-closed 39-closed 195-closed 300Membrane valve 200Ball valve (spherical plug valve) 18Needl
2、e valve 1000Butterfly valve (larger then 6 inch) 20Globe valve 300Nozzle (suction nozzle on vessel) 32Check valve (in-line ball type) 150Check valve (swing type) 135Filter (Y-type and bucket type) 250Surface roughness value Evarious materialsGlass 0.015Lead 0.015Copper 0.015Brass 0.015Steel Pipenew 0.04After longer use 0.2Slightly rusted 0.4Very rusted 3.35galvanised 0.15Cast ironNew 0.5With bitumen layer 0.2Slightly rusted 1.5Very rusted 3.0
