Beggs & Brill Method

[kvbalu2129]

Hi all

Could some one enlighten me on whether Beggs&Brills method is the best way to calculate Pressure drop in Steam Lines ?

regards

 

[chemlite]

no,
you shouldn't use that model for steam,
read some good book for the range of application of that model .

 

[kvbalu2129]

Thanks Chemlite. I would also like to know which is the correct method to be used in ASPEN HYSYS?

 

[GHartmann]

See if you can find a copy of Crane the fluid flow handbook:

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http://flowoffluids.com/publications/crane-tp-410.aspx

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It has an excellent simplified equation for steam flow that works well for all practical applications.

The Crane manual is a "must have" for those who routinely calculate fluid flow.

G.Hartmann
BS ChE NCSU

 

[GHartmann]

Sorry, I copied the link incorrectly.

[link Crane]

http://flowoffluids.com/

[/url]

 

[GHartmann]

OOPS one more time:

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http://flowoffluids.com/

[/url]

 

[GHartmann]

Well this is embarrassing:

Crane

 

[chemlite]

Crane is a good option,
also you may investigate about the alternative methods available in your software,
Beggs & Brill is specific for HC + water multi phase flow,
I have a different tool (PRODE PROPERTIES which I use from Excel)
there is a macro =PIPE() for solving pipe segments with heat exchange,
for multi phase flow it allows to define models such as Beggs & Brill,
however it switches automatically for single phase fluids such as water,
possibly there is something equivalent in your software.

 

[kvbalu2129]

thanks chemlite and GHartmann. I am unable to run Prode as there is a DEBUG error creeping up in Excel. something to do with the dll file. unable to solve the issue.

 

[chemlite]

in my experience Prode Properties works fine with Excel 32 and 64 running in Windows 7 and 8 (both available in my computers)
which version of Excel are you running ?
Anyway if you have problems to run the software with Excel 32 or 64 you may ask for technical assistance, see
'

http://www.prode.com/en/contact.htm'

I think the PIPE() macro is not available in free versions

 

[kvbalu2129]

Windows 8 (64 bit)

 

[chemlite]

Before to install prode you should verify which version of Excel you have,
in Excel select File and then Help, below the Office logo there is the version,
ff you load 64 bit version of Prode from Excel 32 you get errors.

 

[kvbalu2129]

thanx chemlite. let me reinstall. i think excel is 32 bit

 

[kvbalu2129]

Thanks chemlite. Its running now. I have the nozzle.xls file where i am trying to find out the Outlet temperature and Pressure. How do I do it in Prode? Inlet temperature-264 Deg.C, Pressure is 50 kg/sqcm(g). Downstream is at atmospheric pressure. Hence i guess, Pout should be 1 atm. What would be the outlet Pressure and temperature at the nozzle. Which model should I select (HEM/HNE/HNE-DS/NHNE??????)Kindly let me know.

 

[chemlite]

if you wish to add a question better to open a different thread,
anyway, to use Prode (or a different simulator) as first step you must define the stream (list of components, fractions, thermo models etc.) then in nozzle.xls you define Tin, Pin, Pout and mass flow,
the program calculates the required area and estimates t out,
models are applicable to both single (including dense phase) and two phase flows.
Different variants are possible (i.e. design, rating etc.)
For PSV modeling I prefer HEM which gives conservative values (in two phase flow),
the other models (HNE , HNE-DS , NHNE) are applicable to specific cases
and if you are not sure imho better to use HEM,
note that Prode includes a rigorous HEM not the simplified Omega method.

 

[kvbalu2129]

thanks chemlite