Concentrated head losses for PE/PVC pipe under pressure

The app returns the total concentrated headloss on a pipeline where fittings / valves are installed
Pipe section
Equation for concentrated headlosses

Nominal diameter (external)DN(mm)
Nominal thickness (minimum)e(mm)
Internal diameterDi(mm)
flow-rateQ(m3/sec)
    
Fluid velocity V(m/sec)
Type of fittingQ.ty N ( )K ( )Dh (mH2O)
TOTAL CONCENTRATED HEADLOSS (mH2O)