Pipe pressure drop calculator – two phase

This is a sample of thePipe pressure drop calculator. To access the working calculator, pleasesign up for free membership trial.

The output of this calculator is the pressure drop per unit length given in bar/km. This output figure must be multiplied by the equivalent length of the pipe to calculate the total pressure drop across length of the pipe. The total equivalent length of the pipe is obtained by adding the equivalent lengths of all the fittings to the straight pipe length.

FOR TWO PHASE FLOW

For two phase flow the calculator given below calculates the pressure drop per unit length of the pipe based on theLockhart-Martinelli Method. For prediction of the two phase flow regime various methods can be used.

LIQUID PHASE INPUTS
WL- Liquid Mass flow		kg/h
ρL- Density of liquid		kg/m3
µL- Viscosity of liquid		cP
蒸汽PHASE INPUTS
WG——蒸汽质量流量		kg/h
ρG- Density of vapour phase		kg/m3
µG- Viscosity of vapour phase		cP
M - Molecular weight of vapour phase		gm/gmoles
z - Compressibility factor of vapour phase
Cp/Cvratio for vapour phase
PIPE SPECIFICATIONS
e - Effective roughness of the pipe		mm
d - Nominal diameter of the pipe		inches
sch - pipe schedule
RESULTS
Fluid (mixture) velocity		m/s
Fluid (mixture) density		kg/m3
Fluid (mixture) Reynolds Number
Pressure loss		bar/km

This calculator gives value of pressure drop per unit length of a straight line. But usually pipes are accompanied by bends, fittings, valves etc. UseEnggCyclopedia’s K-factor calculatorto obtain pressure drop across fittings in a line.

For a single phase flow case through a pipe, useEnggCyclopedia's single phase pressure drop calculator.