Dear Pritesh,

There is no simple, reliable equation from which you can find out the pressure drop in your system.

There are a set of equations that can calculate the pressure drop over a short pipe distance dL.

Newton’s laws to calculate accelerations and velocity equations supplement these equations.

The integration of these calculated pressure drops over the total length gives you the total pressure drop.

The pressure drop for product losses requires a product loss factor and formula.

This product loss factor is determined from existing installations or tests.

Suspension velocity and SLR are some of the main parameters in these equations.

The integration method (plus an iteration process) is necessary because of the compressibility of the conveying gas.

The application of a computer facilitates the possibility of executing the high number of calculations to get to this result. (Visual Basic is a great tool to achieve this)

In addition, there are extra pressure drops involved, s.a. filters.

The parameters you supplied in your initial thread are not sufficient to perform a calculation.

At least the following values are needed:

Material

particle size

particle density

bulk density

(suspension velocity)

pipe geometry

capacity

Any other important information s.a. temperatures, altitude, etc.

Success

Teus ■

Dear Pritesh,

There is no simple, reliable equation from which you can find out the pressure drop in your system.

There are a set of equations that can calculate the pressure drop over a short pipe distance dL.

Newton’s laws to calculate accelerations and velocity equations supplement these equations.

The integration of these calculated pressure drops over the total length gives you the total pressure drop.

The pressure drop for product losses requires a product loss factor and formula.

This product loss factor is determined from existing installations or tests.

Suspension velocity and SLR are some of the main parameters in these equations.

The integration method (plus an iteration process) is necessary because of the compressibility of the conveying gas.

The application of a computer facilitates the possibility of executing the high number of calculations to get to this result. (Visual Basic is a great tool to achieve this)

In addition, there are extra pressure drops involved, s.a. filters.

The parameters you supplied in your initial thread are not sufficient to perform a calculation.

At least the following values are needed:

Material

particle size

particle density

bulk density

(suspension velocity)

pipe geometry

capacity

Any other important information s.a. temperatures, altitude, etc.

Success

Teus ■

Dear Tathadream,

Concerning the vacuum installation:

Cell B62 = 699 SCFM

Cell B72 = 0.378 bar vacuum # 1-0.378 = 0.622 bar(abs)

Cell B13 = 100 degrC MIX TEMPERATURE @ DESTINATION

Then:

ICFM = SCFM / bar(abs) * (273+temperature)/ 273

ICFM = 699 / 0.622 * (273+100)/ 273= 1535 ICFM

However, in cell C71 a value of 2412 ICFM is calculated.

Calculated from the capacity and the SLR:

Material mass = 62.5 tons/hr

SLR = 12.7

Air Mass = 62500/12.7 = 4921 kg/hr = 4921/60 = 1.367 kg/sec

Intake temperature = 15 degrC = 288 K

Air mass =1.367 = 1.293 * SCFM * p(abs)/1 * 273/(273+temp)

Air mass =1.367 = 1.293 * SCFM * 1/1 * 273/(2788)

SCFM = (1.367 * 288) / (1.293 * 273) / 0.028316 *60 =

1.11533 / 0.028316 * 60 = 2363 SCFM

From the same spreadsheet, it is possible to calculate the ICFM in two different ways and get two different values.

This should not be possible.

Can you explain this?

BR

Teus

PS. I am familiar with the problem of inconsistencies when writing a program. My hair went gray that way. ■

Dear Tathadream,

Concerning the vacuum installation:

Cell B62 = 699 SCFM

Cell B72 = 0.378 bar vacuum # 1-0.378 = 0.622 bar(abs)

Cell B13 = 100 degrC MIX TEMPERATURE @ DESTINATION

Then:

ICFM = SCFM / bar(abs) * (273+temperature)/ 273

ICFM = 699 / 0.622 * (273+100)/ 273= 1535 ICFM

However, in cell C71 a value of 2412 ICFM is calculated.

Calculated from the capacity and the SLR:

Material mass = 62.5 tons/hr

SLR = 12.7

Air Mass = 62500/12.7 = 4921 kg/hr = 4921/60 = 1.367 kg/sec

Intake temperature = 15 degrC = 288 K

Air mass =1.367 = 1.293 * SCFM * p(abs)/1 * 273/(273+temp)

Air mass =1.367 = 1.293 * SCFM * 1/1 * 273/(2788)

SCFM = (1.367 * 288) / (1.293 * 273) / 0.028316 *60 =

1.11533 / 0.028316 * 60 = 2363 SCFM

From the same spreadsheet, it is possible to calculate the ICFM in two different ways and get two different values.

This should not be possible.

Can you explain this?

BR

Teus

PS. I am familiar with the problem of inconsistencies when writing a program. My hair went gray that way. ■

Originally Posted by Teus Tuinenburg

Dear Tathadream,

Concerning the vacuum installation:

Cell B62 = 699 SCFM

Cell B72 = 0.378 bar vacuum # 1-0.378 = 0.622 bar(abs)

Cell B13 = 100 degrC MIX TEMPERATURE @ DESTINATION

Then:

ICFM = SCFM / bar(abs) * (273+temperature)/ 273

ICFM = 699 / 0.622 * (273+100)/ 273= 1535 ICFM

However, in cell C71 a value of 2412 ICFM is calculated.

Calculated from the capacity and the SLR:

Material mass = 62.5 tons/hr

SLR = 12.7

Air Mass = 62500/12.7 = 4921 kg/hr = 4921/60 = 1.367 kg/sec

Intake temperature = 15 degrC = 288 K

Air mass =1.367 = 1.293 * SCFM * p(abs)/1 * 273/(273+temp)

Air mass =1.367 = 1.293 * SCFM * 1/1 * 273/(2788)

SCFM = (1.367 * 288) / (1.293 * 273) / 0.028316 *60 =

1.11533 / 0.028316 * 60 = 2363 SCFM

From the same spreadsheet, it is possible to calculate the ICFM in two different ways and get two different values.

This should not be possible.

Can you explain this?

BR

Teus

PS. I am familiar with the problem of inconsistencies when writing a program. My hair went gray that way.

Dear Teus,

for calculating the ICFM, I think it,s better to use exit temperature of the air rather than lowest ambient temperature (though we are neglecting the effects of temperature rise in the pipe due to friction), another thing in in your evaluation, you have mixed both fps and SI units, which I think we should not do, but I may be wrong. ■

Originally Posted by Teus Tuinenburg

Dear Tathadream,

Concerning the vacuum installation:

Cell B62 = 699 SCFM

Cell B72 = 0.378 bar vacuum # 1-0.378 = 0.622 bar(abs)

Cell B13 = 100 degrC MIX TEMPERATURE @ DESTINATION

Then:

ICFM = SCFM / bar(abs) * (273+temperature)/ 273

ICFM = 699 / 0.622 * (273+100)/ 273= 1535 ICFM

However, in cell C71 a value of 2412 ICFM is calculated.

Calculated from the capacity and the SLR:

Material mass = 62.5 tons/hr

SLR = 12.7

Air Mass = 62500/12.7 = 4921 kg/hr = 4921/60 = 1.367 kg/sec

Intake temperature = 15 degrC = 288 K

Air mass =1.367 = 1.293 * SCFM * p(abs)/1 * 273/(273+temp)

Air mass =1.367 = 1.293 * SCFM * 1/1 * 273/(2788)

SCFM = (1.367 * 288) / (1.293 * 273) / 0.028316 *60 =

1.11533 / 0.028316 * 60 = 2363 SCFM

From the same spreadsheet, it is possible to calculate the ICFM in two different ways and get two different values.

This should not be possible.

Can you explain this?

BR

Teus

PS. I am familiar with the problem of inconsistencies when writing a program. My hair went gray that way.

Dear Teus,

for calculating the ICFM, I think it,s better to use exit temperature of the air rather than lowest ambient temperature (though we are neglecting the effects of temperature rise in the pipe due to friction), another thing in in your evaluation, you have mixed both fps and SI units, which I think we should not do, but I may be wrong. ■

Dear Tathadream,

Using the exit temperature to calculate the intake conditions does not seem to be logical.

Br

Teus ■

Dear Tathadream,

Using the exit temperature to calculate the intake conditions does not seem to be logical.

Br

Teus ■

Originally Posted by Teus Tuinenburg

Dear Tathadream,

Using the exit temperature to calculate the intake conditions does not seem to be logical.

Br

Teus

in that it case it is best to consider tmeperature at inlet, which is 150 deg C (it is the mixture temperature. The fly ahs temperature at precipitator bottom is 200 deg C) ■

Originally Posted by Teus Tuinenburg

Dear Tathadream,

Using the exit temperature to calculate the intake conditions does not seem to be logical.

Br

Teus

in that it case it is best to consider tmeperature at inlet, which is 150 deg C (it is the mixture temperature. The fly ahs temperature at precipitator bottom is 200 deg C) ■

Dear Tathadream,

Then the new verifying calculations become:

Concerning the vacuum installation:

Cell B62 = 699 SCFM

Cell B72 = 0.378 bar vacuum # 1-0.378 = 0.622 bar(abs)

Cell B13 = 150 degrC MIX TEMPERATURE @ DESTINATION

Then:

ICFM = SCFM / bar(abs) * (273+temperature)/ 273

ICFM = 699 / 0.622 * (273+200)/ 273= 1947 ICFM

However, in cell C71 a value of 2412 ICFM is calculated.

Calculated from the capacity and the SLR:

Material mass = 62.5 tons/hr

SLR = 12.7

Air Mass = 62500/12.7 = 4921 kg/hr = 4921/60 = 1.367 kg/sec

Air conditions for SCFM are 1 bar(a) and 273 degrC.

Air mass =1.367 = 1.293 * SCFM * 0.028316 /60

SCFM = 1.367/1.293 / 0.028316 *60 = 2240 SCFM

However, he calculated SCFM is given as 699 SCFM (cell B62)

Calculation of vacuum pump displacement

Exit temperature = 200 degrC = 473 K

Air mass =1.367 = 1.293 * (1-vacuum)/1 * 273/(273+temp) * ICFM

Air mass =1.367 = 1.293 * (1-0.378)/1 * 273/(473) * ICFM

ICFM = (1.367 * 473) / (1.293 * 273) / 0.622 / 0.028316 * 60 =

1.83176 / 0.028316/0.622 * 60 = 6239 ICFM = Vacuum pump displacement.

I still find the figures confusing.

Have a nice day

Teus ■

Dear Tathadream,

Then the new verifying calculations become:

Concerning the vacuum installation:

Cell B62 = 699 SCFM

Cell B72 = 0.378 bar vacuum # 1-0.378 = 0.622 bar(abs)

Cell B13 = 150 degrC MIX TEMPERATURE @ DESTINATION

Then:

ICFM = SCFM / bar(abs) * (273+temperature)/ 273

ICFM = 699 / 0.622 * (273+200)/ 273= 1947 ICFM

However, in cell C71 a value of 2412 ICFM is calculated.

Calculated from the capacity and the SLR:

Material mass = 62.5 tons/hr

SLR = 12.7

Air Mass = 62500/12.7 = 4921 kg/hr = 4921/60 = 1.367 kg/sec

Air conditions for SCFM are 1 bar(a) and 273 degrC.

Air mass =1.367 = 1.293 * SCFM * 0.028316 /60

SCFM = 1.367/1.293 / 0.028316 *60 = 2240 SCFM

However, he calculated SCFM is given as 699 SCFM (cell B62)

Calculation of vacuum pump displacement

Exit temperature = 200 degrC = 473 K

Air mass =1.367 = 1.293 * (1-vacuum)/1 * 273/(273+temp) * ICFM

Air mass =1.367 = 1.293 * (1-0.378)/1 * 273/(473) * ICFM

ICFM = (1.367 * 473) / (1.293 * 273) / 0.622 / 0.028316 * 60 =

1.83176 / 0.028316/0.622 * 60 = 6239 ICFM = Vacuum pump displacement.

I still find the figures confusing.

Have a nice day

Teus ■

Dear Sir:

Thanks for e-mailing me the valuable article.

Best Wishes,

Y.C. Wang ■

Dear Sir:

Thanks for e-mailing me the valuable article.

Best Wishes,

Y.C. Wang ■

dear dr Amrit Agarwal

Consulting Engineer

Pneumatic Conveying Consulting

Thank you for sending your article in design of dilute phase pneumatic conveying

I read it and prepared the excel file

it help me in my conveying project

Best regards

ali rashidi ■

dear dr Amrit Agarwal

Consulting Engineer

Pneumatic Conveying Consulting

Thank you for sending your article in design of dilute phase pneumatic conveying

I read it and prepared the excel file

it help me in my conveying project

Best regards

ali rashidi ■

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

Der Mr. Agarwal

I have been trying to find your article about system design calculations for pneumatic conveying published in the 04/2005 issue of Powder Handling and Processing magazine, but sadly without success.

Would you please be so kind as to send me a copy of that article?

Tkhanking in advance for your consideration, kind regards

Alexander Eberl ■

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

Der Mr. Agarwal

I have been trying to find your article about system design calculations for pneumatic conveying published in the 04/2005 issue of Powder Handling and Processing magazine, but sadly without success.

Would you please be so kind as to send me a copy of that article?

Tkhanking in advance for your consideration, kind regards

Alexander Eberl ■

Dear Amit,

Kindly send me a copy at huzwas@yahoo.com ■

Dear Amit,

Kindly send me a copy at huzwas@yahoo.com ■

Sir, as I am working on making machinery specs. the said article could be helpful for me. so, please send me the copy.

atulkumarhingnekar@gmail.com ■

Sir, as I am working on making machinery specs. the said article could be helpful for me. so, please send me the copy.

atulkumarhingnekar@gmail.com ■

Respected Mr. Agarwal,

I have gone trough ypur article, Its realy shows the guideline to design a pneumatic conveying system.

Well, I have a question, You have mention the friction multiplier differs from material to material, and it ranges from 0.4 to 4.0, Can you please what should be the Friction multipler for a Material like "Fly Ash and Cement".

I am eagerly waiting for your reply sir.

Regards,

R.K.Khuntia ■

Respected Mr. Agarwal,

I have gone trough ypur article, Its realy shows the guideline to design a pneumatic conveying system.

Well, I have a question, You have mention the friction multiplier differs from material to material, and it ranges from 0.4 to 4.0, Can you please what should be the Friction multipler for a Material like "Fly Ash and Cement".

I am eagerly waiting for your reply sir.

Regards,

R.K.Khuntia ■

can you send me the copy of the same at atulkumarhingnekar@gmail.com.

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

■

can you send me the copy of the same at atulkumarhingnekar@gmail.com.

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

■

Dear Mr. Amrit

Please send a copy of "Theory and Design of Pneumatic Conveying Systems".

I am designing a Ash handling system, I am not able to design the total air requirement and compressor selection. Can you please inlight something, so that I can select a suitable compressor.

Regards

Santosh ■

Dear Mr. Amrit

Please send a copy of "Theory and Design of Pneumatic Conveying Systems".

I am designing a Ash handling system, I am not able to design the total air requirement and compressor selection. Can you please inlight something, so that I can select a suitable compressor.

Regards

Santosh ■

Dear Amrit

I'm a Student at Lund Institute of Technology in Sweden.

Right now I'm doing my diploma work were the task is to

computer simulate the flow of pellets/granules trough a short radius bend

in a pneumatic conveying system.

When I'm going to simulate the flow in a bend, I'm not

sure what granule parameters has the biggest affect on the flow. Because

It’s a short radius bend it will most likely bounce a lot in the walls.

For example, the Hardness, coefficient of restitution, elasticity, density, friction (granule/wall) (granule/granule)

It would be interesting to read your article and maybe it can help me find my answers?

May I also request a copy of your article? And excel file?

Regards Palmberg

cim04jp9@student.lth.se ■

Dear Amrit

I'm a Student at Lund Institute of Technology in Sweden.

Right now I'm doing my diploma work were the task is to

computer simulate the flow of pellets/granules trough a short radius bend

in a pneumatic conveying system.

When I'm going to simulate the flow in a bend, I'm not

sure what granule parameters has the biggest affect on the flow. Because

It’s a short radius bend it will most likely bounce a lot in the walls.

For example, the Hardness, coefficient of restitution, elasticity, density, friction (granule/wall) (granule/granule)

It would be interesting to read your article and maybe it can help me find my answers?

May I also request a copy of your article? And excel file?

Regards Palmberg

cim04jp9@student.lth.se ■

Dear Palmberg,

Have a look at:

http://www.powderandbulk.com/videos/...ca75622a642691

Success

Teus ■

Dear Palmberg,

Have a look at:

http://www.powderandbulk.com/videos/...ca75622a642691

Success

Teus ■

Dear Amrit

Thank so much for your article sending to me. After I went through it, I think it made me more understand the nature of pneumatic conveying. I have some problem with solid accel. calculation on worksheet 3. I will give you the details by mail.

Yingsak.K ■

Dear Amrit

Thank so much for your article sending to me. After I went through it, I think it made me more understand the nature of pneumatic conveying. I have some problem with solid accel. calculation on worksheet 3. I will give you the details by mail.

Yingsak.K ■

Dear sir,

I am working as a project manager in oneof the malaysian company.I need the conveyour calculation method.Please send me the pdf to me.(naedtech@yahoo.com)

Thanks and regards,

James ponraj. ■

Dear sir,

I am working as a project manager in oneof the malaysian company.I need the conveyour calculation method.Please send me the pdf to me.(naedtech@yahoo.com)

Thanks and regards,

James ponraj. ■

Dear Mr. Matias,

Rather than adding vacuum blower why not add another cyclone for the second system, so there is no interference. ■

Dear Mr. Matias,

Rather than adding vacuum blower why not add another cyclone for the second system, so there is no interference. ■

Dear sir,

I am an engineer working in plastic factory. Could you please give me the calculated results from following data.

Material to convey : Calcium carbonate

Conveying rate : 1500 kg / hrs.

Line diameter : 2 inch

Starting from the inlet, line is 4 meter horizontal, then 90 degree long radius bend, then line is 6 meter vertical, then 90 degree long radius bend connected to the inlet of receiving bin.

Conveying line material : stainless steel pipe

Use ambient air at standard conditions.

Need to know : pressure drop in a vacuum type conveying system and

: type of blower and power used

Your assistance is much appreciated.

Visanu ■

Dear sir,

I am an engineer working in plastic factory. Could you please give me the calculated results from following data.

Material to convey : Calcium carbonate

Conveying rate : 1500 kg / hrs.

Line diameter : 2 inch

Starting from the inlet, line is 4 meter horizontal, then 90 degree long radius bend, then line is 6 meter vertical, then 90 degree long radius bend connected to the inlet of receiving bin.

Conveying line material : stainless steel pipe

Use ambient air at standard conditions.

Need to know : pressure drop in a vacuum type conveying system and

: type of blower and power used

Your assistance is much appreciated.

Visanu ■