Dear Navneeth,

Selecting a pneumatic compressor starts with the selection and design of the pneumatic system itself.

The design results in a required volume and a required pressure.

For low pressure ratios (< 1.5 - 2 ) a roots type blower is normally chosen.

For higher pressure ratios (>1.5 - 2) a screw compressor is selected.

Those types of compressors are oil free.

Other types of compressors are also available.

As you obviously have very low pressure system (centrifugal fan), a lobe blower is the best choice.

See for their specific properties the attached pdf-file

Have a nice day

Teus

Attachments

types of convey air compressors2 (PDF)

■

Dear Navneeth,

Selecting a pneumatic compressor starts with the selection and design of the pneumatic system itself.

The design results in a required volume and a required pressure.

For low pressure ratios (< 1.5 - 2 ) a roots type blower is normally chosen.

For higher pressure ratios (>1.5 - 2) a screw compressor is selected.

Those types of compressors are oil free.

Other types of compressors are also available.

As you obviously have very low pressure system (centrifugal fan), a lobe blower is the best choice.

See for their specific properties the attached pdf-file

Have a nice day

Teus

Attachments

types of convey air compressors2 (PDF)

■

Daer Teus,

Thank you very much for your advice.

From the way it goes i could judge that i don't have adequate knowledge on pneumatic conveying systems.

I like to learn from the basics to final design, i have some reference book. But i feel your guidance will make me to learn easily and quickly.

Please refer some books or article to know well about pneumatic conveying system.

Thanks & Regards,

Navneeth ■

Daer Teus,

Thank you very much for your advice.

From the way it goes i could judge that i don't have adequate knowledge on pneumatic conveying systems.

I like to learn from the basics to final design, i have some reference book. But i feel your guidance will make me to learn easily and quickly.

Please refer some books or article to know well about pneumatic conveying system.

Thanks & Regards,

Navneeth ■

Dear Navneeth,

Have you read the following articles?

Pneumatic conveting, Performance and Calculations:

https://news.bulk-online.com/?p=65

Dense phase- or dilute phase pneumatic conveying:

https://news.bulk-online.com/?p=238

Pneumatic conveying, turbo- or positive displacement air mover :

https://news.bulk-online.com/?p=309

Energy consumption per ton of a pneumatic conveying system:

https://news.bulk-online.com/?p=331

Pneumatic conveying, an unexpected relationship.

https://news.bulk-online.com/?p=445

Best regards

Teus ■

Dear Navneeth,

Have you read the following articles?

Pneumatic conveting, Performance and Calculations:

https://news.bulk-online.com/?p=65

Dense phase- or dilute phase pneumatic conveying:

https://news.bulk-online.com/?p=238

Pneumatic conveying, turbo- or positive displacement air mover :

https://news.bulk-online.com/?p=309

Energy consumption per ton of a pneumatic conveying system:

https://news.bulk-online.com/?p=331

Pneumatic conveying, an unexpected relationship.

https://news.bulk-online.com/?p=445

Best regards

Teus ■

Dear Teus,

Thank you very much for your advice and prompt reply.

Really these conversation makes me to learn more efficiently.

Thank you for the link you provided. I already read some of the articles.

But the calculation part is computer program which i cannot use to calculate the conveying capacity.

Please go through the attachment i have made in the thread "Pneumatic conveying of milk powders" and help me in calculating the conveying capacity through that 2.5" (63 mm) pipe.

Please kindly advice as this is the prior requirement i have as of now.

Regards

Navneeth ■

Dear Teus,

Thank you very much for your advice and prompt reply.

Really these conversation makes me to learn more efficiently.

Thank you for the link you provided. I already read some of the articles.

But the calculation part is computer program which i cannot use to calculate the conveying capacity.

Please go through the attachment i have made in the thread "Pneumatic conveying of milk powders" and help me in calculating the conveying capacity through that 2.5" (63 mm) pipe.

Please kindly advice as this is the prior requirement i have as of now.

Regards

Navneeth ■

Dear Navneeth,

As suggested by Teus, if you intend to change your existing system from fan to Roots Blower, I would suggest you also re design the system. Using a Roots Blower @ 1700 cmh will be a waste of power and money for this system.

You would be better off with a 2 inch pipe, with most likely a 5 HP blower.

Best Luck,

Vikas Gaikwad ■

Dear Navneeth,

As suggested by Teus, if you intend to change your existing system from fan to Roots Blower, I would suggest you also re design the system. Using a Roots Blower @ 1700 cmh will be a waste of power and money for this system.

You would be better off with a 2 inch pipe, with most likely a 5 HP blower.

Best Luck,

Vikas Gaikwad ■

Dear Vikas,

I could not get your point, could you please clarify again.

Thanks & Regards

Navneeth ■

Dear Vikas,

I could not get your point, could you please clarify again.

Thanks & Regards

Navneeth ■

Dear Navneeth,

As adviced by Vikas, it is wise to redesign the installation considering the already in placed equipment.

Or, if you already have a design calculation, check your design again.

The existing installation seems to be designed with a very low SLR, leading to the situation that most of the pressure drop is related to the air friction losses, rather than the material product losses.

I made a preliminary design calculation myself and came to the conclusion that the required pressure drop in your system for 1.5 tons/hr at 1700 m3/hr amounts to approx 2100 mmWC (.21 bar). This is probably too much for your fan.

I also made a preliminary calculation for the same pipeline with a GM15L, Aerzen blower at 4800 rpm (0.28 m3/sec) and found for 1500 kg/hr a pressure drop of 810 mmWC.

(Air lock losses neglected)

Redesigning means evaluating your previous choices, combined with the gained knowledge from measurements.

Therefore, I repeat:

quote:

As you have a “working” system, you can perform the following.

Obtain the fan curve from the supplier’s datasheet.

Measure the fan delivery pressure with an empty pipeline system.

Locate on the fan volume/pressure curve the airflow.

Then repeat this measurement for systematically increased feeding rates and find the point, where pneumatic conveying is stopped.

This exercise will reveal the function of your system.

unquote

Changing the pipe diameter from 4” to 2” seems a waste of money, although the blower has to be bigger for the 4”pipeline.

Have a nice day

Teus ■

Dear Navneeth,

As adviced by Vikas, it is wise to redesign the installation considering the already in placed equipment.

Or, if you already have a design calculation, check your design again.

The existing installation seems to be designed with a very low SLR, leading to the situation that most of the pressure drop is related to the air friction losses, rather than the material product losses.

I made a preliminary design calculation myself and came to the conclusion that the required pressure drop in your system for 1.5 tons/hr at 1700 m3/hr amounts to approx 2100 mmWC (.21 bar). This is probably too much for your fan.

I also made a preliminary calculation for the same pipeline with a GM15L, Aerzen blower at 4800 rpm (0.28 m3/sec) and found for 1500 kg/hr a pressure drop of 810 mmWC.

(Air lock losses neglected)

Redesigning means evaluating your previous choices, combined with the gained knowledge from measurements.

Therefore, I repeat:

quote:

As you have a “working” system, you can perform the following.

Obtain the fan curve from the supplier’s datasheet.

Measure the fan delivery pressure with an empty pipeline system.

Locate on the fan volume/pressure curve the airflow.

Then repeat this measurement for systematically increased feeding rates and find the point, where pneumatic conveying is stopped.

This exercise will reveal the function of your system.

unquote

Changing the pipe diameter from 4” to 2” seems a waste of money, although the blower has to be bigger for the 4”pipeline.

Have a nice day

Teus ■

Dear Navneeth,

I had thought that using a smaller pipe with less air flow would save power, but considering the calculation given by Teus, I am convinced the power saved will be miniscule compared to the work involved of changing to 2” pipe especially so if it is already built. So stick with the 4” size.

Regards,

Vikas Gaikwad ■

Dear Navneeth,

I had thought that using a smaller pipe with less air flow would save power, but considering the calculation given by Teus, I am convinced the power saved will be miniscule compared to the work involved of changing to 2” pipe especially so if it is already built. So stick with the 4” size.

Regards,

Vikas Gaikwad ■

"Theory and Design of Dilute Phase Pneumatic Conveying Systems" was published this month in Powder Handling and Processing magazine.

Can I have one copy of this magazine.

pls send to this mail : kvkirankumar319@gmail.com

Regards,

kiran kumar ■

"Theory and Design of Dilute Phase Pneumatic Conveying Systems" was published this month in Powder Handling and Processing magazine.

Can I have one copy of this magazine.

pls send to this mail : kvkirankumar319@gmail.com

Regards,

kiran kumar ■

Dear Amrit

i'm a student at faculty of mechanical engineering and i have a project about calculations of pneumatic conveying so i need to help me please

my email : h.hammod@hotmail.com

i'm waitting you

thanks ■

Dear Amrit

i'm a student at faculty of mechanical engineering and i have a project about calculations of pneumatic conveying so i need to help me please

my email : h.hammod@hotmail.com

i'm waitting you

thanks ■

Dear Mr.Agarwal,

Thank you for your article. It was very useful for me to understand the basics and calculation procedure of pneumatic conveying. Very good article and it should be used by many peoples so that the knowledge is spread everywhere.

Thank you

Navneeth ■

Dear Mr.Agarwal,

Thank you for your article. It was very useful for me to understand the basics and calculation procedure of pneumatic conveying. Very good article and it should be used by many peoples so that the knowledge is spread everywhere.

Thank you

Navneeth ■

Dear Amrit Agarwal,

You are so kindly person. I've received the article of Theory and Design of Dilute Phase Pneumatic Conveying Systems.

it's good value for me on work.

Thanks so much for your information.

Best regards,

Phan Van An -

thoi: 0983010672

Nh my Sa Dielac-Vinamilk ■

Dear Amrit Agarwal,

You are so kindly person. I've received the article of Theory and Design of Dilute Phase Pneumatic Conveying Systems.

it's good value for me on work.

Thanks so much for your information.

Best regards,

Phan Van An -

thoi: 0983010672

Nh my Sa Dielac-Vinamilk ■

Dear Amrit

May I have a copy of this article?

My e-mail is anurak.thaweenuch@lv-technology.com

"... If you know basic Excel, you can use my calculation method published in Powder Handling and Processing magazine in its April 2005 issue. This article gives the theory and all of the equations that are internally used in computer programs. It takes the mystery out of the computer programs. I can send a free PDF copy if you need one...."

Best regards ■

Dear Amrit

May I have a copy of this article?

My e-mail is anurak.thaweenuch@lv-technology.com

"... If you know basic Excel, you can use my calculation method published in Powder Handling and Processing magazine in its April 2005 issue. This article gives the theory and all of the equations that are internally used in computer programs. It takes the mystery out of the computer programs. I can send a free PDF copy if you need one...."

Best regards ■

Amrit,

thanks for the article...it is great to see the work u have performed. ■

Amrit,

thanks for the article...it is great to see the work u have performed. ■

Dear Mr. Agarwal,

Could you be so kind to send me a copy of your paper.

Thanks in advance,

Best Regards,

Asssoc. Prof. Todor Djourkov, Dipl. Eng. PhD

todordj@plov.omega.bg ■

Dear Mr. Agarwal,

Could you be so kind to send me a copy of your paper.

Thanks in advance,

Best Regards,

Asssoc. Prof. Todor Djourkov, Dipl. Eng. PhD

todordj@plov.omega.bg ■

Dear Mr. Amrit Agarwal,

May I have a copy of this article?

My e-mail is artsenal55@hotmail.com

Best regards ■

Dear Mr. Amrit Agarwal,

May I have a copy of this article?

My e-mail is artsenal55@hotmail.com

Best regards ■

Dear Mr. Amrit Agarwal

I acessed to this forum in several time and I see your are experienced in the pneumatic conveying.

Could you please help me the following issue:

Now I'm chosing a blower for our pneumatic conveying system as below data:

Conveying distance: 55m,

Conveying lift: 32m,

Pipe diameter: ND150, sch40,

Expected capacity: 80t/h

Number of bend: 2

As my calulation, the capacity of blower is 1500m3/h and pressure loss is 2.81 bar.

Pls give me your comment on my calculation.

P/S: How I can read your post in this particle.

Thank in advance. ■

Dear Mr. Amrit Agarwal

I acessed to this forum in several time and I see your are experienced in the pneumatic conveying.

Could you please help me the following issue:

Now I'm chosing a blower for our pneumatic conveying system as below data:

Conveying distance: 55m,

Conveying lift: 32m,

Pipe diameter: ND150, sch40,

Expected capacity: 80t/h

Number of bend: 2

As my calulation, the capacity of blower is 1500m3/h and pressure loss is 2.81 bar.

Pls give me your comment on my calculation.

P/S: How I can read your post in this particle.

Thank in advance. ■

Dear Armit,

Thank alot for your kindly respond,

There are some additional information:

Material to be transport: bulk cement,

Density: 0.8-1.2 ton/m3

Compressed air as normal.

Hope to receive your reply soon. ■

Dear Armit,

Thank alot for your kindly respond,

There are some additional information:

Material to be transport: bulk cement,

Density: 0.8-1.2 ton/m3

Compressed air as normal.

Hope to receive your reply soon. ■

Dear Amrit Agarwal

Thank you for your article. It was very useful for me to understand basic design

of pneumatic conveying systems.

Best regards

Nipon ■

Dear Amrit Agarwal

Thank you for your article. It was very useful for me to understand basic design

of pneumatic conveying systems.

Best regards

Nipon ■