Dear Daniel,

After modeling the installation, I ran my computer program for different airflows and 3 tons/hr, resulting in the respective calculated pressure drops.

Actually, this is all I did.

How the program works is explained at:

https://news.bulk-online.com/pneumat...veying/65.html

Have a nice day

Teus ■

Dear Daniel,

After modeling the installation, I ran my computer program for different airflows and 3 tons/hr, resulting in the respective calculated pressure drops.

Actually, this is all I did.

How the program works is explained at:

https://news.bulk-online.com/pneumat...veying/65.html

Have a nice day

Teus ■

Originally Posted by Amrit Agarwal

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ +++++++++++++++++

Dear Gomathi,

My article will not help you much because it is related to Dilute Phase Conveying only. For improving your dense phase systems I suggest you describe its present design so that it can be discussed here in this Forum.

Regards,

Amrit Agarwal

Pneumatic Conveying Consulting

Email: polypcc@aaol.com

Dear Amrit,

May I have a copy of your article on Dilute Phase Conveying? It would be of great use to me as I am currently working on a debottlenecking project on the conveying system of a polymer plant. My email is: daryl.lim@mail.utoronto.ca

Thank you for your assistance!

Best Regards,

Daryl Lim

Process Engineer Intern, TPC (Singapore) ■

Originally Posted by Amrit Agarwal

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ +++++++++++++++++

Dear Gomathi,

My article will not help you much because it is related to Dilute Phase Conveying only. For improving your dense phase systems I suggest you describe its present design so that it can be discussed here in this Forum.

Regards,

Amrit Agarwal

Pneumatic Conveying Consulting

Email: polypcc@aaol.com

Dear Amrit,

May I have a copy of your article on Dilute Phase Conveying? It would be of great use to me as I am currently working on a debottlenecking project on the conveying system of a polymer plant. My email is: daryl.lim@mail.utoronto.ca

Thank you for your assistance!

Best Regards,

Daryl Lim

Process Engineer Intern, TPC (Singapore) ■

Originally Posted by Amrit Agarwal

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

Daryl,

I think what you need is my article : "DEBOTTLENECKING PNEUMATIC CONVEYING SYSTEMS" published in CHEMICAL ENGINEERING magazine in 2004.

This is a very detailed article describing all methods for increasing the capacity of conveying systems. Please contact me if you would like to have this article.

Regards,

Amrit Agarwal

PNEUMATIC CONVEYING CONSULTING

EMAIL: POLYPCC@AOL.COM

Dear Amrit,

It would be greatly appreciated if you could send me your article. My email address is: daryl.lim@mail.utoronto.ca

On another note, I would like to know what would be the steps/thought process involved when trying to increase the carrying capacity of an existing system. As of now, I am merely clutching at straws as it is my first time being involved in a project of this nature. The areas I have thought about studying are:

1) Pressure drop across the blower system

2) Saltation velocities

3) Maximum solid loading ratio (though I do not know how to calculate this)

4) Physical equipment inspections

I hope you are able to provide me with some advice and guidance as to how I should approach this task, and if my choice of areas to look at are appropriate.

Best Regards,

Daryl ■

Originally Posted by Amrit Agarwal

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

Daryl,

I think what you need is my article : "DEBOTTLENECKING PNEUMATIC CONVEYING SYSTEMS" published in CHEMICAL ENGINEERING magazine in 2004.

This is a very detailed article describing all methods for increasing the capacity of conveying systems. Please contact me if you would like to have this article.

Regards,

Amrit Agarwal

PNEUMATIC CONVEYING CONSULTING

EMAIL: POLYPCC@AOL.COM

Dear Amrit,

It would be greatly appreciated if you could send me your article. My email address is: daryl.lim@mail.utoronto.ca

On another note, I would like to know what would be the steps/thought process involved when trying to increase the carrying capacity of an existing system. As of now, I am merely clutching at straws as it is my first time being involved in a project of this nature. The areas I have thought about studying are:

1) Pressure drop across the blower system

2) Saltation velocities

3) Maximum solid loading ratio (though I do not know how to calculate this)

4) Physical equipment inspections

I hope you are able to provide me with some advice and guidance as to how I should approach this task, and if my choice of areas to look at are appropriate.

Best Regards,

Daryl ■

Dear Amrit,

Thank you for the article, it has been of great assistance to me. Are there any further suggestions you can give me, with regards to my previous post? Your help (and anyone's help) would be greatly appreciated.

Best Regards,

Daryl ■

Dear Amrit,

Thank you for the article, it has been of great assistance to me. Are there any further suggestions you can give me, with regards to my previous post? Your help (and anyone's help) would be greatly appreciated.

Best Regards,

Daryl ■

Originally Posted by Amrit Agarwal

My article "Theory and Design of Dilute Phase Pneumatic Conveying Systems" was published this month in Powder Handling and Processing magazine. This article gives an easy to use Excel-based calculation method for designing new dilute phase pneumatic conveying systems or for improving the performance of existing conveying systems.

Regards,

Amrit T. Agarwal

Consulting Engineer

Pneumatic Conveying Consulting Services

Email: polypcc@aol.com

Ph and Fax: 304 346 5125

Sir,

How am i going to size the blower for pneumatic conveying of guar gum of bulk density 780kgs/m3. the rate requied is appx. 6tons/hr. Can you provide me the calculation in form of excel sheet to do this calculation.

Hope I would get an favourable and early reply to resolve my issue.

Thanking you in advance sir.

Girish Babu

Principal Engineer

Mott ■

Originally Posted by Amrit Agarwal

My article "Theory and Design of Dilute Phase Pneumatic Conveying Systems" was published this month in Powder Handling and Processing magazine. This article gives an easy to use Excel-based calculation method for designing new dilute phase pneumatic conveying systems or for improving the performance of existing conveying systems.

Regards,

Amrit T. Agarwal

Consulting Engineer

Pneumatic Conveying Consulting Services

Email: polypcc@aol.com

Ph and Fax: 304 346 5125

Sir,

How am i going to size the blower for pneumatic conveying of guar gum of bulk density 780kgs/m3. the rate requied is appx. 6tons/hr. Can you provide me the calculation in form of excel sheet to do this calculation.

Hope I would get an favourable and early reply to resolve my issue.

Thanking you in advance sir.

Girish Babu

Principal Engineer

Mott ■

Dear Sir,

Can you mail me the design calculation concept to be considered for pneumatic conveying system along with the Calculation sheet involved for

both Dense & Dilute phase.My mail id is vijeth.alva@acclimited.com

Warm Regards, ■

Dear Sir,

Can you mail me the design calculation concept to be considered for pneumatic conveying system along with the Calculation sheet involved for

both Dense & Dilute phase.My mail id is vijeth.alva@acclimited.com

Warm Regards, ■

Dear Amrit,

It would be appreciated if you could send me these articles. My email address is: mojgan63s@yahoo.com

1)Theory and design of pneumatic conveying systems"

2)"Debottlenecking Pneumatic Conveying Systems" and

3)"Product Quality in Pneumatic Conveying"

Many thanks in advance

Mojgan ■

Dear Amrit,

It would be appreciated if you could send me these articles. My email address is: mojgan63s@yahoo.com

1)Theory and design of pneumatic conveying systems"

2)"Debottlenecking Pneumatic Conveying Systems" and

3)"Product Quality in Pneumatic Conveying"

Many thanks in advance

Mojgan ■

Dear Amrit,

It would be appreciated if you could send me these article. My email address is: mojgan63s@yahoo.com

1) "Theory and Design of Pneumatic Conveying Systems"

2) "Debottlenecking Pneumatic Conveying Systems" and

3) "Product Quality in Pneumatic Conveying"

Best,

Mojgan ■

Dear Amrit,

It would be appreciated if you could send me these article. My email address is: mojgan63s@yahoo.com

1) "Theory and Design of Pneumatic Conveying Systems"

2) "Debottlenecking Pneumatic Conveying Systems" and

3) "Product Quality in Pneumatic Conveying"

Best,

Mojgan ■

Thank You for posting the information about the Design Calculations for Pneumatic Conveying.

A computer programme for the simulation of dilute phase pneumatic conveying of solids is presented. This includes positive pressure and vacuum pneumatic conveying. The characteristic conveying parameters such as the conveying absolute pressure, conveying air density, interstitial and average air velocity, particle velocity and voidage are calculated by integrating five differential equations that govern two-phase flow. The two-phase flow is approximated as one-dimensional along the pipe axis. Density and acceleration effects are accounted for.

A new method is presented for the determination of the solids friction coefficient from the solids motion equation. This allows for a more accurate determination of the solids velocity in the pipeline when compared to currently used methods. The computer model results are compared to experimental results for cement and ice conveying yielding good correlation for the main output parameters. ■

Thank You for posting the information about the Design Calculations for Pneumatic Conveying.

A computer programme for the simulation of dilute phase pneumatic conveying of solids is presented. This includes positive pressure and vacuum pneumatic conveying. The characteristic conveying parameters such as the conveying absolute pressure, conveying air density, interstitial and average air velocity, particle velocity and voidage are calculated by integrating five differential equations that govern two-phase flow. The two-phase flow is approximated as one-dimensional along the pipe axis. Density and acceleration effects are accounted for.

A new method is presented for the determination of the solids friction coefficient from the solids motion equation. This allows for a more accurate determination of the solids velocity in the pipeline when compared to currently used methods. The computer model results are compared to experimental results for cement and ice conveying yielding good correlation for the main output parameters. ■

Dear Mr. Amrit T. Agarwal,



I am working in the pneumatic conveying field, I have been reading a lot from forums mentioning your name and your helpful calculations method article that was published in Powder Handling and Processing magazine in its April 2005 issue.

Tried to look many places for this article, couldn’t find. I shall be obliged if you send me this article.

Thank you in advance for your help.

Best Regards, ■

Dear Mr. Amrit T. Agarwal,



I am working in the pneumatic conveying field, I have been reading a lot from forums mentioning your name and your helpful calculations method article that was published in Powder Handling and Processing magazine in its April 2005 issue.

Tried to look many places for this article, couldn’t find. I shall be obliged if you send me this article.

Thank you in advance for your help.

Best Regards, ■

Dear Amrit,

I worked in the past for many different fields in deferent areas but not the powder conveying. The Industry I am working at this time implements that a lot and for myself looking forward to learn a lot about the design and behavior of powder conveying in order to implement for modifications needed and implement new conveying systems.

I started reading the Article you have sent me, first I would like to thank you advance, sure will have some questions, collecting them and will submit for discussion ones next week.

Thanks. ■

Dear Amrit,

I worked in the past for many different fields in deferent areas but not the powder conveying. The Industry I am working at this time implements that a lot and for myself looking forward to learn a lot about the design and behavior of powder conveying in order to implement for modifications needed and implement new conveying systems.

I started reading the Article you have sent me, first I would like to thank you advance, sure will have some questions, collecting them and will submit for discussion ones next week.

Thanks. ■

Dear Amrit,

Thank you once again for your article on debottlenecking pneumatic conveying systems. I have reviewed the article over the past few weeks and have learned much from your insight. I was hoping that you would also be able to send me your article containing your pressure drop calculation for dilute phase conveying, as I am experiencing difficulty in obtaining reliable pressure drop values for a particular system.

The system layout is as follows:

Conveying Line

horizontal: 64m

vertical: 43m

5x 90 degree bends

8 bore pipe

Pneumatic Line

8b x 65m x 13ea

Exhaust Line

12b x 142m x 15 ea

Conveying gas is nitrogen

Conveying capacity: 25 t/h

Solids: Polypropylene powder

The pressure drop values I have obtained are beyond my expectations, as such I am inclined to feel that my calculations are unreliable. Is anyone able to help?

Best Regards,

Daryl ■

Dear Amrit,

Thank you once again for your article on debottlenecking pneumatic conveying systems. I have reviewed the article over the past few weeks and have learned much from your insight. I was hoping that you would also be able to send me your article containing your pressure drop calculation for dilute phase conveying, as I am experiencing difficulty in obtaining reliable pressure drop values for a particular system.

The system layout is as follows:

Conveying Line

horizontal: 64m

vertical: 43m

5x 90 degree bends

8 bore pipe

Pneumatic Line

8b x 65m x 13ea

Exhaust Line

12b x 142m x 15 ea

Conveying gas is nitrogen

Conveying capacity: 25 t/h

Solids: Polypropylene powder

The pressure drop values I have obtained are beyond my expectations, as such I am inclined to feel that my calculations are unreliable. Is anyone able to help?

Best Regards,

Daryl ■

Dear Daryl,

What is meant by ea?

Can you share the calculation results, which you have obtained.

(Or are the calculation results not in line with the measurements of an existing system?)

What nitrogen flow have you used?

From the given information, I suspect the installation to be a closed system.

Which means that there are filters incorporated.

The feeder system is also not mentioned.

All the components in the system (can) generate pressure drop.

Why trying to calculate the pressure drop by yourself, instead of asking an offer from a manufacturer?

Take care

Teus ■

Dear Daryl,

What is meant by ea?

Can you share the calculation results, which you have obtained.

(Or are the calculation results not in line with the measurements of an existing system?)

What nitrogen flow have you used?

From the given information, I suspect the installation to be a closed system.

Which means that there are filters incorporated.

The feeder system is also not mentioned.

All the components in the system (can) generate pressure drop.

Why trying to calculate the pressure drop by yourself, instead of asking an offer from a manufacturer?

Take care

Teus ■

Originally Posted by Teus Tuinenburg

Dear Daryl,

What is meant by ea?

Can you share the calculation results, which you have obtained.

(Or are the calculation results not in line with the measurements of an existing system?)

What nitrogen flow have you used?

From the given information, I suspect the installation to be a closed system.

Which means that there are filters incorporated.

The feeder system is also not mentioned.

All the components in the system (can) generate pressure drop.

Why trying to calculate the pressure drop by yourself, instead of asking an offer from a manufacturer?

Take care

Teus

Hi Teus,

Thank you for your reply. The specifications I posted are from a manufacturer's design calculations. The "ea" refers to 90 degree bends, I apologize for not being clear on that. Yes, a filter is used in this system. Its pressure drop is rated to be approximately 150 mmAq. The feeder system is by use of rotary valve. I was hoping to obtain an estimate of the pressure drop caused by the pipeline as part of assessment for a debottlenecking study.

I am unsure as to what you meant by "what nitrogen flow" I have used, could you kindly elaborate?

The reason as to why I did not consult the manufacturer is because a few modifications have been made to the plant over the past few years, and the initial system described in the design spec may not be operating at the same level of efficiency. That being said, no pipeline changes were made. The changes were made only in the operating conditions.

I hope this helps to elaborate the system a little.

Best Regards,

Daryl ■

Originally Posted by Teus Tuinenburg

Dear Daryl,

What is meant by ea?

Can you share the calculation results, which you have obtained.

(Or are the calculation results not in line with the measurements of an existing system?)

What nitrogen flow have you used?

From the given information, I suspect the installation to be a closed system.

Which means that there are filters incorporated.

The feeder system is also not mentioned.

All the components in the system (can) generate pressure drop.

Why trying to calculate the pressure drop by yourself, instead of asking an offer from a manufacturer?

Take care

Teus

Hi Teus,

Thank you for your reply. The specifications I posted are from a manufacturer's design calculations. The "ea" refers to 90 degree bends, I apologize for not being clear on that. Yes, a filter is used in this system. Its pressure drop is rated to be approximately 150 mmAq. The feeder system is by use of rotary valve. I was hoping to obtain an estimate of the pressure drop caused by the pipeline as part of assessment for a debottlenecking study.

I am unsure as to what you meant by "what nitrogen flow" I have used, could you kindly elaborate?

The reason as to why I did not consult the manufacturer is because a few modifications have been made to the plant over the past few years, and the initial system described in the design spec may not be operating at the same level of efficiency. That being said, no pipeline changes were made. The changes were made only in the operating conditions.

I hope this helps to elaborate the system a little.

Best Regards,

Daryl ■

Hi Daryl,

Based on the given information and additional assumptions, I quick modeled the installation and calculated the pressure drop for a Polypropylene powder capacity of 25 tons/hr

I assumed a material loss factor in relation to a comparable plastic powder.

I also assumed a Nitrogen flow of 0.63 m3/sec.

The resulting calculated pressure drop is 0.75 bar at 25 tons/hr

N2 velocity is 11.7 to 20 m/sec.

Whether this corresponds with the real installation (in technical execution and operation and material conveying properties) has to be judged by yourself.

Using the existing installation with its operational performance data as a “test facility”, it is possible to tune the calculations for this material and subsequently calculate the implication of intended modifications.

Have a nice day

Teus ■

Hi Daryl,

Based on the given information and additional assumptions, I quick modeled the installation and calculated the pressure drop for a Polypropylene powder capacity of 25 tons/hr

I assumed a material loss factor in relation to a comparable plastic powder.

I also assumed a Nitrogen flow of 0.63 m3/sec.

The resulting calculated pressure drop is 0.75 bar at 25 tons/hr

N2 velocity is 11.7 to 20 m/sec.

Whether this corresponds with the real installation (in technical execution and operation and material conveying properties) has to be judged by yourself.

Using the existing installation with its operational performance data as a “test facility”, it is possible to tune the calculations for this material and subsequently calculate the implication of intended modifications.

Have a nice day

Teus ■

Dear Mr. Amrit,

I have reviewed the article that you have sent me; First I would like to thank you so much, it is very helpful guide, learned much about the dilute phase conveying system, it helped me understanding various parameters have an impact on the system when pneumatically conveying. ■

Dear Mr. Amrit,

I have reviewed the article that you have sent me; First I would like to thank you so much, it is very helpful guide, learned much about the dilute phase conveying system, it helped me understanding various parameters have an impact on the system when pneumatically conveying. ■

We have a application wherein soda ash is to be conveyed from an offshore vessel to a container pllaced on barge.

Can your provide the calcualtions to be carried out for find the air pressur & quantity required? ■

We have a application wherein soda ash is to be conveyed from an offshore vessel to a container pllaced on barge.

Can your provide the calcualtions to be carried out for find the air pressur & quantity required? ■