![Parker Hannifin Banner](/sites/default/files/public/adverts/parker_improve_standard_0.gif)
Pneumatic Conveying Formulae
I sell a computer program "Pneucalc" which will solve your design, but it sells for $1000 US plus shipping.
However, if you send the information as to the capacity, horizontal distance, vertical distance and pipe diameter, I will size the system for you for $300.00 US ■
Re: Pneumatic Conveying Parameters
Unfortunately, pneumatic conveying system desgn is not yet understood so clearly that you can just fill in the blanks of a computer programme and you GET THE DESIGN !!!
The only way to make your system work efficiently is to go for laboratory scale testing and then scale up based on lab data. This will give you a most reliable and energy efficient optimised system.
For further info/help in this matter you may please contact the undersigned. ■
Re: Pneumatic Conveying Parameters
This may be true for new materials, but cement has been conveyed since the early 1930's.
Many companies would have you send samples and do testing, but I have been sizing systems with my program for over 20 years, and not one has been unsuccessful. ■
Re: Pneumatic Conveying Parameters
Computer programs are only a means to calculate the pressure drop in a conveying pipeline. But besides pressure drop, many other factors must be considered if a conveying system is to operate successfully. This is where expertise and experience comes in. Buying a computer program and plugging in the numbers do not guarantee success unless the user has expertise in pneumatic conveying or gets help from people who have this expertise.
I have written several articles on successful design of a conveying system. I can send a pdf copy if any body is interested.
Users can also get this information from books written by experts like Dr. David Mills.
Regards,
A. T. Agarwal
Consulting Engineer
polypcc@aol.com ■
Re: Pneumatic Conveying Parameters
please send your articles or any papers can help me to design and calculate the total pressure drop, for cement ■
Cement System Sizing
Ahmed
I have had recent e-mail corresponmdence with Nasser Ismaeil of ECC on what I believe is the same subject you are asking about.
I have provided Nasser with insight and information and now it is time to formalize a working relationship in order to move forward. ■
Re: Pneumatic Conveying Parameters
My article "Theory and Design of Pneumatic Conveying Systems" gives all of the calculation methods that are needed to design a pneumatic conveying system. This article will be published this month. All you need is some basic knowledge of Excel to run the calculations. This information is free. After its publication, I will be able to send a copy to any one who requests it.
Regards,
A. T. Agarwal
Consulting Engineer
Pneumatic Conveying Consulting Services
polypcc@aol.com
Ph and Fax: 304 346 5125 ■
Re: Pneumatic Conveying Parameters
Dear Amrit thank you so much for your great effort and thank you so much for your interest sir
i need help to calculate the total pressure drop to our conveying system and to know what phase (dilute or dense) we are working as from my calculation we are working in two phase system (between dilute and dense) and i don't if i am wrong
so please help me in the following:
1- total pressure drop
2- dilute or dense phase or something else
3- how can perform debottlenecking the system to increase capacity from 120 t/h to 140 t/h
4- in calculation which inlet velocity i take as we use x pump (is the vel. of air inlet to pump or the vel. at the nozzle of the pump after air mix with cement)
We use pressurized system using screw comp. And x pump 350 for feeding cement 140 t/h
CONVEYING PIPE LINE DIAMETER : 10”
HORIZONTAL DISTANCE : 132 M
VERTICAL DISTANCE : 55 M
NUMBER OF BENDS : 5
NUMBER OF TWO WAY VALVE : 4
COMP. DISCHARGE PR. : 1.7 BAR (max. pressure 2.21 bar)
COMP. FLOW RATE (free air delivery) : 68 M3/MIN
thank you again
Eng. ahmed Ali
Egyptian cement Co.
Cairo - Egypt ■
Cement Conveying
Ordinay Portland Cement is manufactured to close limits and as so much data is available for the material, reliable computer programs are possible and further testing is not necessary. For OPC conveyed through rubber hose or oil well cement conveyed through regular pipeline, for example, where little data is available, testing would be recommended. Testing would always be recommended for any untried material.
68 m3/h of free air at 1.7 bar gauge should be just right for 140 tonne/h of cement in a 250 mm bore pipeline. If 120 tonne/h is being achieved through a 250 mm bore pipeline, a step up to 300 mm bore about 2/3rds of the way along should see an improvement to at least 140 tonne/h. ■
Re: Pneumatic Conveying Parameters
you mean 2/3 of the total length of pnumatic conveying line or what
thanks ■
Positioning Steps In Stepped Pipelines
Two-thirds along the length of the pipeline is in terms of the equivalent length of the pipeline and takes account of sections of vertical lift and bends, as well as horizontal pipeline. 2/3rds is just a very approximate figure. It will need to be calculated to get it right for maximum improvement. The critical thing is that the velocity at entry to the larger 300 mm bore section of pipeline should not be lower than that at the start of the pipeline with the 250 mm bore pipe. The further down the line (towards the discharge end) you make it the safer you will be (if you are just going to make a guess) but the percentage improvement will decrease. ■
Re: Pneumatic Conveying Parameters
Dear Grundos 2004
You may recall we offered you a proposal for our services to provide a complete design recview of your situation and offer our technical recommendations which included the possibility of stepping the pipeline if that is an appropriate remedy for your problem.
Incorrectly stepping a conveying line will create more problems than you have originally if you get it wrong on the short side and conceiveably can offer no benefits or minimal benefits if you are too conservative on the long side. ■
Re: Pneumatic Conveying Parameters
Dear Ahmed,
I have already given you the results of my calculations based on the line layout that you sent me. Dr. Mills advice is about the same except that the 300 mm step is needed about 1/3 distance from the end point of the conveying line to get the 140 tph rate. But make sure that you don't have a feed limit.
Regards,
A. T. Agarwal
Consulting Engineer
Pneumatic Conveying Consulting LLC
polypcc@aol.com ■
Re: Pneumatic Conveying Parameters
As previously stated, and in agreement with Dr. Mills, I believe the existing compressor has sufficent capability to acheive the rate. I believe there are other problems which limit his capacity.
When a line is stepped as is being suggested in this case, the complete line from the step point to the discharge end must be increased, meaning any diverter valvers on top of the silo bank must also be changed. I believe in this case, there are (4) 250mm valves which would have to be changed as well.
The costs of such a change out can be quite high and in this case, even if the line is stepped as suggested, the higher rate could very well still not be acheived. ■
Re: Pneumatic Conveying Parameters
THANK YOU SO MUCH
BUT WHAT CHANGE I COULD DO FOR THE 250 TWO WAY VALVE AND THAT WILL REDUCE THE PRESSURE DROP
THANK YOU ■
Re: Pneumatic Conveying Parameters
Depending on the frequency which you change directions, you may want to consider a 300mm WYE fitting with manually operated line blinds to isolate the leg not being used. Line blinds can also be automated if you need to frequently change destinations. ■
Re: Pneumatic Conveying Parameters
It is not imperative to change the diverter valves. Keeping them as they are is another option with a somewhat longer 300 mm line.
Regards,
A. T. Agarwal
Consulting Engineer
Pneumatic Conveying Consulting Services
Email: polypcc@aol.com
Ph and fax: 304 346 5125 ■
Re: Pneumatic Conveying Parameters
Originally posted by Amrit Agarwal
My article "Theory and Design of Pneumatic Conveying Systems" gives all of the calculation methods that are needed to design a pneumatic conveying system. This article will be published this month. All you need is some basic knowledge of Excel to run the calculations. This information is free. After its publication, I will be able to send a copy to any one who requests it.
Regards,
A. T. Agarwal
Consulting Engineer
Pneumatic Conveying Consulting Services
polypcc@aol.com
Ph and Fax: 304 346 5125
Hello, I am very interested in that article. I would appreciate it if you can mail me the copy at skjuan@gmail.com
Thanks. ■
Theory And Design Of Pneumatic Conveying Systems
Dear Sir,
Iam interested in getting a copy of your article.
Please send it on info@deeptiair.com
Regards,
Gautam
Regards,
A. T. Agarwal
Consulting Engineer
Pneumatic Conveying Consulting Services
polypcc@aol.com
Ph and Fax: 304 346 5125
■
Pneumatic Conveying Parameters
Determine pneumatic conveying paremeters
I have a pneumatic system for transporting cement from x pump to the silos by compressed air so i need the way and the formulas
required to determing the following:
1 - pressure required from the compressor
2 - volume rate of the air required
3 - determine the required velocity at the traction point and at the dischrge pipe end.
4 - how can determine minimum conveying air velocity.
eng. ahmed ali mohamed
egyptian cement co.
e. mail : ahmed.mohamed@ecc-eg.net ■