Extract from Fluid Flow Design Software version 1.7.
The L/D for a ball check valve is 150
For each pipe diameter, D4, D3, D2, D1 (exit to entry)
Calculate the fluid velocity,
V = Q / A
Calculate the Reynolds number,
If mixture then, Re = ?mixVD / ?mix
If vehicle then, Re = ?vehVD / ?mix
If liquid then, Re = ?liqVD / ?mix
Calculate the Fanning friction factor, ƒ
If Calc method = Newtonian mixture, vehicle, liquid then,
If Re < 2100 then, ƒ = 16 / Re
If Re > 3000 then, ƒ = 0.0625 / (LOG(k / 3.7D + 5.74 / Re0.9))2
If Re > 2100 and Re < 3000 then, interpolate
If Calc method = other procedure then,
Calculate ƒ using the selected procedure (eg Lazarus & Neilson)
Calculate the head loss in metres of mixture,
?Hpipe = (4ƒL/D)V2 / 2g and ?Hfittings = KV2 / 2g
Calculate the pipe wall pressure drop,
If mixture then, ?Ppipe = ?mix g ?Hpipe
If vehicle then, ?Ppipe = ?veh g ?Hpipe
If liquid then, ?Ppipe = ?liq g ?Hpipe
Calculate the fittings pressure drop, ?Pfittings = ?mix g ?Hfittings
Have fun