# Pressure loss calculation

## Calculation: Pressure loss by fittings

Auxiliary table: Drag coefficient (Zeta) of a pipe bend according to bend radius (r) and pipe diameter (d)

 r/d 1 2 4 6 10 Zeta 0,5 0,3 0,23 0,18 0,2 Quantity Total =

Auxiliary table: Drag coefficient (Zeta) of a pipe bend with pipe diameter large (dgroß) and pipe diameter small (dklein)
 dgroß/dklein 0,1 0,3 0,5 0,6 0,8 0,9 Zeta 0,45 0,42 0,38 0,3 0,17 0,09 Quantity Total =

Auxiliary table: Drag coefficient (Zeta) of an elbow fitting according to elbow angle (alpha)
 alpha 10° 15° 30° 45° 60° 90° Zeta 0,04 0,06 0,15 0,3 0,6 1,2 Quantity Total =

Auxiliary table: Drag coefficient (Zeta) of various fittings
 Fitting Zeta Quantity Total Inlet/outlet connection at tank, Type 1 0,06 Inlet/outlet connection at tank, Type 2 0,56 Inlet/outlet connection at tank, Type 3 2,8 ball valve 0,6 Y-valve 0,6 DIN shutoff valve 3,9 corner valve 3,0 Solenoid valve 6,0 Non-return valve 6,0 Clack or needle flow detector 5,8 Float element flow meter 6,5
 Zeta drag coefficient Zeta [] (total for all individual fittings) Q Flow rate / Dosing rate [l/h] w flow velocity [m/s] d pipe diameter [mm] Density Chemical density [kg/dm3] (Water = 1.0) decimal places pA Pressure loss by fittings [bar] [calculated by w] pA Pressure loss by fittings [bar] [calculated according to Q and d]

## Rough calculation for clean pipes

Rough calculation for clean pipes

 n (dynamic) viscosity [mPa*s] (e.g. salt solution = 23.6) w flow velocity [m/s] d pipe diameter [mm] L pipe line lengthg [m] Density Chemical density/td> [kg/dm3] (Water = 1.0) decimal places Re Reynold number [r] [<2320 Strömung laminar, >2320 turbulent] pR pressure loss in pipe line [bar]

## Total pressure loss

 Total pressure loss = pressure loss by fittings + pressure loss in pipe line pG = pA + pR

Any evaluations and results are based on rough calculations and have to be checked by your own. No guarantee.