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Application example: Pressure drop in steam pipe

Steam Boiler System design: 

Steam pressure = 10 bar absolute

Steam saturated temperature = 179.9 oC

Steam flow rate = 8 kg/s = 93,203.88 LPM

Steam density = 5.15 kg/m3

Steam dynamic viscosity = 0.015 cP

Pipe diameter = 0.254m

Total pipe length = 500m (including valves and fittings equivalent length)

Pipe material: Steel

Applied Working:  

Density and dynamic viscosity of steam at the given steam pressure is determined separately from steam application software. 

Rule of thumb: Darcy-Weisbach equation is for incompressible flow  for liquids.  Steam is a compressible gas. Darcy-Weisbach incompressible flow equation for liquids can be used to estimate the pressure loss for gases if the calculated pressure drop is less than 10% of the upstream absolute pressure. The result is less conservative.  Actual calculation using compressible flow equation for gases will yield a slightly higher pressure drop. See results calculated using Compressible, Isothermal flow equation.

input and result screen snapshots  . . . 

series pipe pressure drop calculation page 

Results Deliverable:

In ePF Loop program, the results can be saved in pdf file.  Download Steam Pressure Loss calculation result in pdf format here.

>> Application example (2-Loop ):  Two-loop pipe network flow and pressure drop analysis

>> worked example (2-Loop): Two-loop Hydrant ring main pipe pressure drop analysis

>> worked example (Series + Loop): Hydrant ring main system 

>> worked example (Series): Wet Riser system

>> worked example (Series): Water pumping main system

 >> see results comparison example: ePF Loop vs a 3rd party program

>> Analysis example: see Loop pipe ring main.