What Correlation To Be Used In Hysys Pipe Segments For Steam?
What Correlation To Be Used In Hysys Pipe Segments For Steam?
(OP)
Just wondering what is the best correlation to be used in a pipe segment of HYSYS for steam? (the closest one to reality for finding the pressure drop of a pipe).





RE: What Correlation To Be Used In Hysys Pipe Segments For Steam?
As the steam progresses through the system, it looses pressure and begins to change state, which affects the pressure drop.
Saturated steam systems act differently than superheated steam systems. "Rough" internal
As heat is lost through insulation, the pressure drop is also affected. Make sure that the insulation is accurately evaluated in your model.
Crane #410 has a general approximate method that can be used.
Please complete the thread and let us know of your final comparison.
regards
MJCronin
Sr. Process Engineer
RE: What Correlation To Be Used In Hysys Pipe Segments For Steam?
I dont think theres any of the correlations avaialable that has been developed for steam/condensate flow specifically.
Best regards, Morten
RE: What Correlation To Be Used In Hysys Pipe Segments For Steam?
If the steam is dry the answer depends on the pressure drop. If the pressure drop over the line is less than 10% of the absolute upstream pressure then you can safely use the incompressible model - i.e. the Darcy-Weisbach formula for liquids - unless you are looking for extreme accuracy. See the discussion in the example at http://www.katmarsoftware.com/examples/aioflo-exam... . This example is actually for air, but the 10% rule applies to all ordinary gases and vapors.
If the pressure drop is above 10%, but the velocities are in the normal industrial piping range, then you can generally use the isothermal compressible model which is hardly any more complicated than the incompressible model. The only extra information it requires is the upstream pressure and it takes into account the expansion and acceleration of the gas as it flows down the line.
If you are working with very high velocities - for example with high pressure vents to atmosphere - then you should use the adiabatic model. If you use the isothermal model in a situation like this you would over-estimate the pressure drop (and under-estimate the flow rate). The errors are usually not high and if you are sizing a vent to be safe then this error will work in your favor, but if you are trying to calculate emissions for compliance reasons you would be under-estimating the risk.
Katmar Software - AioFlo Pipe Hydraulics
http://katmarsoftware.com
"An undefined problem has an infinite number of solutions"
RE: What Correlation To Be Used In Hysys Pipe Segments For Steam?
RE: What Correlation To Be Used In Hysys Pipe Segments For Steam?
RE: What Correlation To Be Used In Hysys Pipe Segments For Steam?