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7/27/2019 Estimate Depressuring Load When Software Is not Available.doc
http://slidepdf.com/reader/full/estimate-depressuring-load-when-software-is-not-availabledoc 1/3
Estimate Depressuring Load When Software Is not
Available
Mojtaba Habibi Process Engineer at Petroleum Engineering and Development Company
(PEDEC)
Dears,
As you kno so!tares like H"#"#, $%&#&M and Pro'&& are idely used !or
depressuriation studies *ut +at to do i! so!tare is not available it+ process engineer
due to any reason
An interesting paper is recently publis+ed in C+emical Engineering journal dated on une
-./0 titled 12apor depressuriation ' concept and implementation1 3+is paper is ritten
by MrHites+ Pandya
At t+is paper belo e4uation is presented to estimate depressuring load5
6/ 7 (%8M9t) 8 ln (P/9P-)
6+ere5
6/ 7 t+e initial depressuring rate, kg9min
% 7 t+e initial moles o! vapor in t+e system
M 7 t+e molecular eig+t o! vapor, kg9kmol
t 7 time, min
P/ 7 initial upstream pressure, bara
P- 7 !inal upstream pressure, bara
As per aut+or:s e;planation5
/ 3+is e4uation provides good results !or vapor'only systems
- <or ot+er systems a contingency o! beteen -.=/..> s+ould be applied to t+e
calculated rate, to allo !or uncertainties (!or instance, vapor molecular eig+t c+anges
t+at may result !romli4uid !las+)
0 E4uation is valid only !or systems +ere t+e !lorate !rom t+e depressuriationcalculations is critical
7/27/2019 Estimate Depressuring Load When Software Is not Available.doc
http://slidepdf.com/reader/full/estimate-depressuring-load-when-software-is-not-availabledoc 2/3
? &t also assumes t+at temperature, molecular eig+t and compressibility are constant
t+roug+out t+is period
Could you please s+are your e;periences it+ t+is e4uation in terms o! accuracy and
reliability in comparison it+ your cases +ic+ +ave been studied by so!tare
Also anyone t+at does not +ave t+is paper can send me an e'mail !or a copy (My e'mail
address5 mojtaba+abibi/@/Bya+oocom)
*est,
Mojtaba
Estimate Depressuring oad 6+en #o!tare &s not Available Dears,
As you kno so!tares like H"#"#, $%&#&M and Pro'&& are idely used !or
depressuriation studies *ut +at to do i! so!tare is not available it+ process engineerdue to any reason
An interesting paper is recently publis+ed in C+emical Engineering journal dated on une
-./0 titled 12apor depressuriation ' concept and implementation1 3+is paper is ritten
by MrHites+ Pandya
At t+is paper belo e4uation is presented to estimate depressuring load5
6/ 7 (%8M9t) 8 ln (P/9P-)
6+ere5
6/ 7 t+e initial depressuring rate, kg9min
% 7 t+e initial moles o! vapor in t+e system
M 7 t+e molecular eig+t o! vapor, kg9kmol
t 7 time, min
P/ 7 initial upstream pressure, bara
P- 7 !inal upstream pressure, bara
As per aut+or:s e;planation5
/ 3+is e4uation provides good results !or vapor'only systems
- <or ot+er systems a contingency o! beteen -.=/..> s+ould be applied to t+e
7/27/2019 Estimate Depressuring Load When Software Is not Available.doc
http://slidepdf.com/reader/full/estimate-depressuring-load-when-software-is-not-availabledoc 3/3
calculated rate, to allo !or uncertainties (!or instance, vapor molecular eig+t c+anges
t+at may result !rom
li4uid !las+)
0 E4uation is valid only !or systems +ere t+e !lorate !rom t+e depressuriation
calculations is critical
? &t also assumes t+at temperature, molecular eig+t and compressibility are constant
t+roug+out t+is period
Could you please s+are your e;periences it+ t+is e4uation in terms o! accuracy and
reliability in comparison it+ your cases +ic+ +ave been studied by so!tare
Also anyone t+at does not +ave t+is paper can send me an e'mail !or a copy (My e'mail
address5 mojtaba+abibi/@/Bya+oocom)
*est,Mojtaba
%avid
%avid Hoos+mand
Process ead Engineer at HEDC
Dear Mojtaba,
3+anks !or good in!ormation
As you:ve mentioned t+is e4uation assumed constant temperature +ile in reality,
temperature may varies signi!icantly, ie, depressuriing air !rom 0. bar to bar leads
F.GC reduction o! temperature #o, t+is e4uation is good !or small pressure drop
egards,
Hoos+mand