Carlos

The question you posted didn't have to do with optimizing your pneumatic system -- you already stated that the air pressure from the 8 bar compressor was to be throttled back to 4 bar for conveying purposes.

There is no need to make a detailed calculation, your intuition was correct that it does not make sense to expend the energy to pressure the air to 8 bar, only to use it at 4 bar.

A properly sized compressor the conditions you need will be more cost effective in the long term.

Regards ■

I can't low the pressure, because the compressor delivers ait to other uses that need air at 8 bar, like pneumatic valves and pistons.

Mr. Amrit, I read your article many times, but I'm not sure about use it to DENSE PHASE CALCULATIONS, because in the title says that is for DILUTE PHASE... Mr. Amrit, I was closing the pressure reducter valve from 8 to 0,8 bar, and the system works very good. I think that positive displacement blowers could be a good choice for this aplication.

I'll be attempt for your comments.

Carlos Aguirre

Energy Saving Engineer

BIOFILM S.A.

Colombia ■

Dear Mr. Agarwal,

Many thanks for your article about "Theory and Design of Dilute Phase Pneumatic Conveying Systems". It is very useful for me to size the dilute phase conveying pipes.

I am also really looking forward for the publication of your article about dense phase conveying. Because my company want to setup a sea bulk container loading unit for PTA.

Regards

J.K.Yu ■

i think it is a good choice to using a air buffer tank if everyone want dense phase conveying, and also i think the pressure of air buffer tank is not less than 6bar, from my test , i think the low pressure of air buffer tank can not lower the airflow of transport. and it is difficult to get a dense conveying calculation formula, also experiences is very important.

■

SIR , I WOULD JUST LIKE TO THANKYOU ONE THOUSAND TIMES FOR SENDING ME SUCH AN USEFULL ARTICLE

IT HAS CLEARED A LOT OF MY QUERIES BUT I STILL HAVE SOME I.E WHAT IS FANNING FACTOR STANDS FOR & FROM WHERE TO GET THOSE LAB DATAS FOR STANDARD MATERIALS .

I ONCE AGAIN WANT TO THANK YOU ■

Dear Mr Agarwal,

I have been looking for a commercial software soultion for designing pneumatic transport systems. By reading these forums I realize that this is not straight forward (is the best alternative the PneuCalc?) and that I need to do these calculations by mt self in each individual case. Could you please send a copy of your article also to me?

kjellhaakon@hotmail.com ■

Can anyone provide me with info regarding calculations associated with dense/dilute phase calcs, including corollaries and there decendance/proofs?

Much appreciation ■

I have been looking everywhere for this article "Theory and Design of Pneumatic Conveying Systems" published in the April 2005 issue of Powder Handling and Processing, i cannot seem to be able to get my hands on it. can anyone PLEASE forward it to me? my email: mtua@irishcement.ie (preferable)

or

maxtua@gmail.com

Thanks so much to whom delivers it

Also,

Can anyone provide me with info regarding calculations associated with dense/dilute phase pneumatic conveying, including corollaries and there decendance/proofs? Or books/journals/articles addressing this topic

Much appreciation

Max Tua ■

Dear Mr. Agarwal,

Thank you for sending the article "Theory and Design of Pneumatic Conveying Systems." It has proven useful in troubleshooting some on site conveyance problems. It is a very informative tool.

Thanks,

Kyle ■

Dear All,

I am not able to locate the article on net, If any one has that article or excel base calculation file, Kindly send me that article on

ranjay.singh@tatasteel.com

Thanks

Ranjay ■

Dear Amrit,

At the momment I'm preparing conveying system for fine coal tranport. I should check supplier calculation due to changes of rate. If your excel calculation can be shared with us, it is should be better.

Rgds.-

Mulyadi Rafiudin

PT Holcim Indonesia Tbk.

Corporate Engineering

Narogong Plant Project Engineer ■

Mr. Agarwal,

Thank you for sending me a copy of "Theory and Design of Dilute Phase Pneumatic Conveying Systems" I found the article to be excelent. It was very clear and easy to follow. I am finding it to be of great practical use.

Regards,

Mark ■

Dear Mark and Amrit,

Could you pls share the documents with me ?

Pls also send at my email adress :

mulyadi.rafiudin@holcim.com

Thank's and Regards.- ■

Thanks by the sent of your publication about the systems of pneumatic transport in dilute phase. Without doubts it has been very useful to improve my project and facilitates the accomplishment of the required calculations.

I want to know where I can find the values of factor K for crude raw mix for the cement manufacture and if this one depends on the inclination of the conduit.

I reiterate my gratefulness to you and request sends articles to me on the subject.

Kindly,

Eng. Ren Laserna Nogueras

Cementos Curazao S. A. ■

As far as my memory serves me I think it is written in the paper somewhere that the K value is to be back calculated from actual pressure drops obtained form lab or pilot scale test facilities. ■

Dear Amrit, thank you for your article. It's an excellent introduction to pneumatic conveying which has helped me greatly with the analysis of an existing conveying system. ■

Dear Armit,

I try to send a mail to you at polypcc@aol.com to request your calculation excel.

Yet the system always send to me a return e-mail.

Colud you send the calculation excel to me at gzf73@163.com?

I am prepareing for a soy flake pneumatic conveying system and I am eager to realize more about the calculation of the system.

Best regards!

Zhifeng Guo ■

Much thanks to Mr. Agarwal for his paper: I can only advise to use it - it takes you through a systematic method and helps a lot (meaning: the second best to copy-paste) to make your own calculations.

Great! ■

Dear Amrit,

Thank you very much for the data you sent me regarding the Rizk and mitsumoto correlations for minimum saltation velociy.

There is one issue not clear to me: what is the real meaning of "average particle diameter?

I find it not reasonable that for many types of particle size distributions- for example - a very wide distribution with let's say particles up to 1 cm large with an average PSD of 500 microns and a 2nd case with all particles at 500 microns the minimum saltation velocity shall be the same.

Can you expalin the meaning of average diameter please?

Best regards

Amit Segev

Negev Industrial Minerals-Isreal

amit@nim.co.il ■

Our PNEU CALC sizing program has been recently updated and can help you with dense phase system sizing.

PNEU CALC has been in use for over 15 years and the latest version has included many improved features including Line Stepping as well.

If you are interested, send me an e-mail to my address below.

Regards ■

I have a question concerning the "Thoery and Design of Dilute Phase Pneumatic Conveying System" system. The equation for pressure drop due to solids aceleration is described as W*Vp/4640. With W being a constant, this value would vary only with Vp. On the example worksheet, the pressure drop due to solids acceleration drops from .371 psia to .006 psia between the first two sections despite the increace in inlet particle velocity. Is W*Vp/4640 the correct equation?

Thanks,

Mark ■

Dear Mr. Agarwal,

Many thanks for your article about "Theory and Design of Dilute Phase Pneumatic Conveying Systems". It has been very useful for my project and the layout is easy to follow.

I am really looking forward for the publication of your article about dense phase conveying.

And I have a question where can I find information about the maximun degree of angle we can use for a pipe transporting polipropilene pellets downward, how to calculate it.

Marisol Petit

marisolpetit@gmail.com ■

Dear Amrit,

Thank you for the article. It is easy to understand. I only have one problem getting the same results using the values in article

due to a question in Solid Acc. Pres drop item in the equation.

How does this equation takes acceleration from rest Vp into account? Neither in excel sheet or in formulas there is velocit difference unit? Amrit can you explain?

Thanks again for great article.

Bahadir ■