Excel library for process calc's including distillation

[cmarc]

Carlo,
thanks for the information,
I have not access to that book, could you share some information about ranges of application for Beggs & Brill model as available in PIPE object of PRODE PROPERTIES?

[carlo.stenali]

for pipelines Beggs & Brill is my default method for multiphase,
for wells, Beggs & Brill is accurate for inclined wells , for vertical wells you may select Orkiszewski method

[cbadia]

cmarc,
there is a large number of documents available showing the performances of Beggs & Brill vs. alternative methods for two phase flow,
you can safely use this model for multiphase flow on horizontal or inclined segments with water content not too high.

[carlo.stenali]

>cmarc wrote
>I have not access to that book, could you share some information about ranges of application for Beggs & Brill model as available in PIPE object of PRODE PROPERTIES?

could you post some details about your application of Beggs & Brill multiphase model ?
Carlo

[mrbabu]

I agree with carlo.stenali,
for multiphase (HC + water)
Beggs & Brill is accurate for inclined segments , for vertical segments you may select Orkiszewski method

[cmarc]

thanks all for the information,
I am modeling a 5 km pipeline (multiphase HC + water 3% vol) near horizontal,
based on your comments I think Beggs & Brill is suitable for this application.

[cstaff]

I am modeling a wet gas compression stage with PRODE PROPERTIES,
which is the correct value for efficiency to enter ?
is that provided by manufacturer for dry gas or should I correct in some way ?
Thanks for help.

[carlo.stenali]

cstaff,
the point to consider here is that efficiency depends from the kind of process application,
if there is little liquid amount perhaps you may use the same value of dry gas for those conditions
(i.e. the value given by manufacturer or estimated for that kind of compression stage)
when the amount of liquid is high (compared top vapor phase) then in most cases you need to enter
a different value (of that for dry gas) for efficiency,
if you are simulating some specific operations as screw compressors then you may ask the manufacturer for suitable value.

[Almart]

thanks Carlo,
I am facing a similar problem (estimate of discharge temperature with wet gas compression satge)

[cmarc]

Carlo has given a good advise,
as first step you can simulate a compression stage with some predefined value for efficiency
this allows to estimate the HP conditions, power etc.
then it's better to ask the manufacturers which (usually) include in simulation specific parameters which allow more accurate results.

[tmander]

PRODE extended five parameters EOS (Peng Robinson, Soave Redlich Kwong, Cubic Plus Association variants)

with release 1.2 of Base version the extended versions of Peng Robinson and Soave Redlich Kwong include five parameters for each compound (previously the five parameters were not available in base version)

have you compared the three parameters version vs. five parameters version ?
Does the five parameters version allow more accuracy on VLE / enthalpy / density values ?

[hcostello]

tmander,
there is a thread at cheresources about this topic,
I have not compared the results but I think the five parameters formulation is more accurate.