13 replies to this topic

[M.Sadiq]

Refer to the most famous article "Successfully Specify Three-Phase Separators" Wayne D. Monnery and William, Y. Svrcek, University Calgary", i attached a page from it in which the formula (Clouded) for the initial estimation of vessel diameter having weir arrangment has been specified.

 

As per my understanding, this formula has been derived from vessel cylinderical volume (V=pi/4*D^2*L), i.e vessel diamter would be D=(4*(VH+VS)/(0.6*pi*L/D))^1/3; where VH & VS are the liquid hold-up and surge volume at the right side of weir. while 0.6 shows that this total liquid volume will occupy 60% of the total vessel volume. But in the article keeping all varibale same, formula contain a factor of 16 instead of 4 (as per above formula), how this 16 factor  came from in this formula ???

 

Pleas help me in this regard,

 

Thanks.

Attached Files

•  Successfully Specify_3_Ph_Separators_R1 9.pdf   160.7KB   435 downloads

[breizh]

Consider this resource to support your query .

Breizh

 

Note : additional resource : Gas liquid and liquid liquid separators by Maurice Steward and K Arnold - Gulf equipment guide .

Edited by breizh, 13 June 2013 - 10:16 PM.

[ankur2061]

Breizh,

 

Both atttachments are of the same article except the OP has posted only the last page of the same article.

 

Regards,

Ankur.

[Shivshankar]

Ankur ,

 

Article provided by Breizh has formula

 

D=(4*(VH+VS)/(0.6*pi*L/D))^1/3

 

 

and Article provided by sadiq has formula

 

D=(16*(VH+VS)/(0.6*pi*L/D))^1/3

 

 

So question arise here is which is genuine article ? or both articles are right ?

 

Regards

Shivshankar

[Art Montemayor]

I suggest you contact Wayne Monnery and ask for his explanation.

 

In the past I have found various errors or typos in Monnery-Svrcek articles.  For example, in this article look in “Figure 2.  Basic designs of horizontal three-phase separators”, sketch “4. Bucket and weir”.  This shows:

 

The collected Heavy liquid shown in the right-hand weir section is drained out and labeled as “Light liquid outlet”.  This can’t be true, since the Light liquid is collected in the bucket shown – but yet, no drain method is shown for the bucket.

 

I suspect this reveals a lack of proper, professional editing, and proofing on the part of the publishers.  This is something that I have noticed has increased considerably in the past 50 years – even in published engineering texts.  This, I am afraid, is attributable to increased published volume, fewer proofing and editing resources, or diminishing professional publishing standards.

 

[Bobby Strain]

Whenever you establish your size, you can check it with software at my website. Just Google my name to find it. Art, do you read the Houston Chronicle? It too is significantly poor in quality, and it's getting worse.

 

Bobby

Edited by Bobby Strain, 13 June 2013 - 01:42 PM.

[M.Sadiq]

Breizh & Shivshankar,

 

Above, I attached the page (4th last page) from the same article you have shared.The formula i highlighted is under the heading of "Horizontal Design Procedure "Weir" , which is same as per you attachment. Below, i attached complete article for your review. In this article, Monnery-Svrcek has explained the sizing of Horizontal separator having weir arrangment with a sample example (Example-2) and use the same formula for the estimation of vessel diameter (see the clouded formula, 3rd last page) .

 

 

Breizh,

 

 

In this forum, most of the posts regarding " Three Phase Separator sizing", you have shared the same article. This shows that your close attachment to this article and thatswhy i hope you already solved the aformentioned example. 

 

 

Ankur,

 

Please share your valuable comments and kindly share any document or excel sheet that help me to size a horizontal separator with a weir arrangment.

 

 

Art Montemayor,

 

your suggestion is right, and the error you highlighted is true.

Attached Files

•  Successfully Specify_3_Ph_Separators_11.pdf   1.54MB   301 downloads

Edited by M.Sadiq, 13 June 2013 - 11:56 PM.

[breizh]

Another resource you might be interested in , at least you will find examples ( scroll down the page)

 

http://www.chemwork.org/sprd.html

 

 

Breizh

[kabtik]

I have prepared a quick and dirty spreadsheet by religiously following Monnery-Svrcek's paper. However the spreadsheet has not been checked by my superiors yet. It can be a good start for you.

 

 3-Phase-Separator.xlsx   15.75KB   389 downloads

[Bobby Strain]

Kabtik,

      The exercise you submitted is good for your learning, but little else. If you want to see a more professional approach, visit my website. You can find it by Googling my name. There are other such programs on the web, too.

 

Bobby

[ojimenezp]

Very usefull info, tanks!

[curious_cat]

 Art, do you read the Houston Chronicle? It too is significantly poor in quality, and it's getting worse.

 

I agree with Art's observation & also yours. This decline in quality, I think, is largely correlated to how easy it has become to publish. 

[Sherif Morsi]

All,

 

This article has had so many discussions, possibly because it is one of the very few literature available for a step by step 3-phase separators.

About the factor 4 or 16 in the said equation for the diameter estimation, I have been using the factor 4 not 16 since the original volume of a cylinder vessel V = Pi/4 x D^2 x L

 

Ankur, what do you mean by OP????

 

Sherif

[ali_fz]

May be this new topic be useful for 3-phase drum sizing:

 

http://www.cheresour...ng-spreadsheet/

Edited by ali_fz, 25 May 2014 - 11:29 PM.