Pnuematic Conveying

Taken from:

http://www.cheresources.com/pnuconvey.shtml

Considering designing a pneumatic conveying system yourself? Probably not a good idea. There's as much art involved as there is science and such a design should be left to professionals. Consider that even different grades of the same material have been known to convey differently......................

It may be best that you purchase an "off-the-shelf" venturi:

http://www.foxvalve.com/frameset-conveying.html

I agree with that 100%. Pneumatic conveying is not as easy as it seems! Drop material into the supply end, blow with air, and deliver it where needed. I know it sounds so simple and one would think that it is all simple plumbing, air volume and velocity, etc..

I have been involved with two (2) manufacturers who use this for the transport of raw materials. In the first case it was ground corn and other substances, and in my present employment it is pelletized plastic.

I suggest to find a firm or two who makes pneumatic conveying their specialty, and not just something they offer. There are of course formulae that apply to all parts of such a system, but every application is unique due to distance, path, and the type of material conveyed. I would not attempt this on my own. I know that nothing I typed here is an answer to the original question, but experience working around these systems tells me to seek guidance from professionals.

Best Regards,

Ing. Robert Forbus

Obtain a copy of Pneumatic Conveying Design Guide

http://www.amazon.ca/Pneumatic-Conveying-Design-Guide-David/dp/0750654716/ref=sr_1_3?ie=UTF8&s=books&qid=1220722719&sr=8-3

It may be of use to you

I work in terephtalic acid and bottle grade PET chips production, so for me pneumatic conveyings of powders and pelletizing solids are day by day challenges!!! Believe, it is not the case to do by yourself, in more than 15 years of production we have tried and changed lot of companies and conveying principles to overcome the difficulties of this particular technology... consider that a 5% change from design critical diameter of your powder/solid is high enough to cause you never ending problems such as piping blockages, pulsing, batch conveying or equipment damages...

My suggestion is... contact companies with familiarity with conveying of your specific material, because I have experienced that conveying PTA is not like conveying PET, and it depends on how long is the distance you have to cover, what is the delivery device (rotary valve? slide gate valve?), what is the isometric of you layout an so on!!! Consider that you may be request by suppliers to provide a material sample

EXAIR's compressed air operated Line Vac connects to standard hose, pipe or tube to create a powerful in-line conveyor. The compact design features large throat diameters for maximum throughput capacity. They are available in a variety of styles and sizes that are suited to a wide variety of transfer applications.

Refer the following link

http://www.exair.com/en-US/Primary%20Navigation/Products/Air%20Operated%20Conveyors/Pages/Air%20Operated%20Conveyors%20Home.aspx

Regards,

RAMARAJ.T

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