Dear Amrit

THank you for mailing the design calculation PDF promptly. I will be in touch with you in case I have some clarifications to seek.

With regards

Dinesh Kamath

Mumbai , India. ■

The pressure drop due to solids accel is a function of outlet gas velocity, which is a function of outlet gas pressure, which is a function of total pressure drop in the section, which is a function of pressure drop due to solids accel. The equations would not appear to be independent. Is this correct?

Thanks,

Mark ■

Thanks Amrit,

This answer clarified my question.

Bahadir ■

Dear Mark,

As you described the physics of pneumatic conveying is correct.

The pressure is dependent of the pressure.

Or the vacuum is depending on the vacuum.

That is why a self solving algorithm is needed to calculate a pneumatic conveying system.

In vacuum conveying, it is even more complicated, because the air flow of the vacuum pump is depending on the vacuum at the pump intake.

best regards

teus ■

Dear Mr. Amrit,

May I have a pdf copy of your article

" Theory and Design of Pneumatic Conveying Systems" as published in the April 2005 issue of Powder Handling Magazine.?

and could you kindly forward your excel files to my e-mail

seelk78254@yahoo.com

Thank you very much!

Best regards

:> ■

I am unable to preformed the calculations described in Mr Agarwal's design article using excell. This circular solids accel pressure drop equation where pressure drop is a funtion of presure drop cannot be solved with excel. I get a circular equation error when I try this. Am I missing something here?

Thanks- Mark ■

Dear Mr. Amrit

Thank you very much for your article about "Theory and design of dilute phase pneumatic conveying systems" that you have been send to me. It's very usefull for me. thanks Mr. Amrit.

Regards,

Darmadi I Gede

Mechanical Engineering

Gadjah Mada University

gddarmadi@yahoo.com ■

Dear Mr. Amrit Agrawal

I am on the look out for system design calculation for lean phase and dense phase pneumatic conveing system. I would request a copy of your article published in Powder Handling & processing magazine published in April 2005.

With regards

Dinesh Kamath

Proprietor

Spectrum Energy Services

Mumbai India.

Email: dineshmkamath@yahoo.com

Phone: 91 - 22 - 28602320 ■

I found Amrit's article very useful to me..Thank you very much..I have a read through other article but there are not clear compare to Amrit's one.. His article is the BEST I ever seen!!! ■

I am using the spreadsheet calulation for a positive pressure system. I have a question regarding the inlet velocity. The article instructs to obtain the inlet velocity from test data. Can I assume atmospheric pressure at the inlet and take the velocity to be the CFM of the blower/ cross sectional area of the pipe?

Thanks ■

The pick up velocity in a pressure system is the inlet cfm of the blower. ICFM, corrected for the discharge pressure and discharge temperature of the air at the actual pick up point in the system to get the ACTUAL cfm or ACFM. That value, divided by the cross sectional area of the pick up point will give you pick up velocity.

The equation for correcting the blower volume is as follows

P1V1/T1 = P2V2/T2

P is pressure in absolute units, PSIA

V is volume in CFM

T is temperature in degrees Rankin

To fine the pressure at the pick up point is what you are using the equations from the work of Zenz and Othmer which is the technology which was explained in the paper to which you refer.

You must know the pick up velocity of the material you are handling either from test work prior experience, calculation of the saltation velocity based on work by authors such as Rizk, Matsumoto or others and then adding a gactor of typically 10-15%, etc.

Hope this helps

Regards ■

Thanks for your help. In order to calculate that pick up velocity at the inlet I need to calulate the presure drops as described in the paper. To do this I start at the outlet of the conveying line and work backwards. I need to enter starting outlet velocity. Can I assume here that pressure at the outlet is atmospheric and my outlet velocity is blower cfm/area? ■

As long as the outlet of your system is actually at atmospheric conditions, you can use atmospheric pressure to determine the terminal velocity as you suggested.

If your outlet is at a pressure other than atmospheric, you have to use that pressure (in absolute terms) to calculate the terminal velocity.

Good Luck ■

Dear Sirs,

I am looking for the calculation program for fly ash pneumatic conveying shstem to verify the technical bid that submitted by the system suppliers.

I sent twice my request for his article along with excel based simple calculation work sheet to Mr. Amrit. But it seems to be he is very busy these days or my email haven't reached to him.

Therefore, if any one have this file, please send me Mr. Armit's article with simple program excel sheet for pneumatic conveying system calculaiton.

In addition, plese give me some information for commercial calculation program for pneumatic conveying system.

E-Mail idybae@yahoo.co.kr

Thankyou in advance,

Bae ■

Dear Bae

If you send an e-mail to my address below, I'd be happy to send you information about our computer programs which have been used by many OEM equipment suppliers, Engineering companies as well as end users for over 15 years.

It is one for the few programs available which is completely user friendly and can handle calculations in both dilute phase as well as dense phase modes. Stepped pipelines can be evaluated as well.

Regards ■

Dear Mr. Armit,

Thankyou very much for your reply.

I've sent you an request mail for your article and this is just for make sure. I found that my mail system is O.K with some other member in this forums for both sending and receiving.

Therefore, if you have not received my request mail yet. Pease send me your article under address of idybae@naver.com

Awaiting for your reply mail along with your article.

Regards,

Bae ■

Dear Mr. Amrit,

Well received your article for Pneumatic Conveying System Calculation. Thank you very much and it would be very helpful for me to understand the system calculation concept.

I will be back to you if I have any question after study of the same.

Regards,

Bae ■

It would be possible to send it also me?

Thanks. ■

Mr. Armit,

I've sent you an request mail for your article and program excel sheet for pneumatic conveying system calculaitonthis.

If you have not received my request mail yet, please send me your article under address of barto77@libeto.it

Awaiting for your reply mail along with your article.

Regards,

LB ■

...nobody can send it to me?

thanks... ■

Mr. Hilbert,

Thanks for help. ■

Mr. Armit,

I've already received your article.

Next week I send you a few questions regarding some critical points of article.

Thank you.

LB. ■

Dear Amrit,

Thank you very much for your article " Theory and Design of Dilute Phase Pneumatic Conveying System".

It is very good article to me to design pnuematic conveying of Tapioca powder as well as malted barley in our factory.

Thanks once again.

Kind Regards

Ravi ■

Dear Mr. Amrit

Could you please send me an electronic copy of your article "Theory and Design of Dilute Phase Pneumatic Conveying Systems" and of the excel program you have made to perform calculations of a pneumatic conveying system?

I’m trying to modify some coal dust and sawdust conveying lines to kiln burners.

Thank you in advance for your help.

Best regards

Carlo Dangio - Italy

carlo.dangio@gmail.com ■

Dear Mr. Amrit

Could you please send me an electronic copy of your article "Theory and Design of Dilute Phase Pneumatic Conveying Systems" and of the excel program you have made to perform calculations of a pneumatic conveying system? I’m trying to modify some coal dust and sawdust conveying lines. Thank you in advance.

Best regards

Carlo Dangio - Italy

carlo.dangio@gmail.com ■

Thank you Mr. Agarwal, I really appreciate your help for sharing with me your work.

Your article is very informative and easy to read.

Now I start preparing the Excel spreadsheet using the calculation procedure described in your article.

Kind regards

Carlo Dangio – Italy

carlo.dangio@gmail.com

PS: Has someone has already developed the pneumatic conveying calculations on Excel …. and wants to share it with me? I shall be very thankful to him. Please send me on my email address … many thanks. Carlo ■

Dear Mr Agarwal,

I would be very grateful if you sent me the article.

my e-mail is: abdullamecheng@yahoo.com ■

Dear all,

I am currently a 3rd year Chemical Engineering Student at the University of Birmingham, undertaking a a group design project. Tha aim of this design project is to increase limestone production at a facility by 300tpd. I have been give the task of designing the pneumatic conveyor systems.

3 Different grades of limestone will be transported:

1) Crushed limestone from 'pile' to kiln

approx 0 - 4mm in size

approx 1400 kg/m3

2) CaO from kiln to silo

approx 0 - 4 mm in size

approx 1200 kg/m3

3) CaO from silo to Hydrator

approx 0 - 4 mm in size

approx 1200 kg/m3

4) Hydrated Lime from Classifier to bagging plant

approx 0 - 90um

approx 500 kg/m3

Due to this being a group groject and as many of you might know I dont know the fincal vertical and/or horizontal heights yet.

The help i require is:

1) What type of system (dense or dilute phase) would be best and why?

2) If any one has any sample pneumatic conveying calculations for the applicable method (tried to contact Mr. Agarwal but have had to luck at the moment)

3) Any sample excel spreadsheets

4) Any help on choosing ancilliary equipment (i.e. feeders, compressors etc) or any calculations that might help.

Thank you any help would be appreciated

Jess Dhariwal

PS. if any one has a copy of Mr. Agarwals calculations (dense and dilute phase) could you please forward it to jxd412@bham.ac.uk ■

Dear Jdhariwal,

1)dense or dilute phase, please see the thread "Pneumatic Conveying of Ash over 6 km"

Certainly the most efficient and reliable pneumatic conveying installation should be designed. (Or another way of material transport)

Calculations will reveal the solution.

2)and 3) Calculation methods are a problem to obtain, as they are mostly considered as being commercial knowledge to the users.

4)This forum is set up with the aim to support colleagues and students.

AS soon as you have more information on the installation parameters such as capacity, routing etc. , contact the forum again.

As you state that the production of limestone of a (existing?) facility has to be increased, the parameters of this facility can serve as a very important reference.

success. ■

Dear Mr. Agarwal,

Please could you send me a copy of ur design calculations for dilute and dense phase flow.

Thank You

J Dhariwal

jxd412@bham.ac.uk ■

Dear Mr Agarwal,

I have not been able to recieve a copy of ur design calcluations, there might be a problem with that address

Sorry for the inconvience

Please could you forward to jdhariwal@hotmail.com

Thank you

Jess Dhariwal ■

Dear Mr.Armit,

Thanks for the article sent to me, on above subject.

I found it's very informative on the design calculations.

I am not having much experience on design calculations. My experience is basically in Installation and commissioning of the conveying systems. So I have to go each and every equation carefully to understand. Can you please recommend any theory books, which will give some more information on the above subject.

Thanks

K.Ranadheer,

Asian Paints Ltd.,

Chennai, India. ■

Dear Mr. Agarwal:

I've read a lot about your some of your articles and I think they might be very useful for some calculations I need to do about a dilute phase conveying system. I'm asking you since I've read so much good reviews so far, I also saw a quote about of this articules on another page and i thought about contacting you.

I'm a student currently working in a brewery and the malt powder vacuum system is going trough some problems, so I think your articles " Powder Handling and Processing", "Theory and Design of Dilute Phase Pneumatic Conveying System" and "Theory and Design of Pneumatic Conveying Systems" might be very helpful as well as the excel sheet.

I'd really appreciatte if you could send all the information you've regarding the subject.

Thanking all the help you can give for advanced...

Jose Quiroz

josenestor7@gmail.com ■

I wanna thank Mr. Amrit for sharing this information with us, on a quick overview it seems really helpful and easy to understand, I recomend to anyone who's interested on this subject to read it... ■