Posted on August 15, 1999 at 12:45:07:

In Reply to: Need Material degradation data in belt conveyors... posted by Dany O. Portales on August 10, 1999 at 21:08:08:

Dear Mr. Portales,

The writer has done material damage testing associated with sandwich belt high angle conveying. The testing was done on grains and on woodchips. Degradation is a serous problem with these materials. That testing showed that there was absolutely no damage when these materials were transported in the sandwich belt conveyor. The same is certainly expected when transporting on a conventional conveyor. In the testing we specifically discluded the affects at transfers when the material crashes into the chutes.

Though this doesn't specifically answer your question I hope it is helpful.

For further discussion please contact the writer at Tel: 1 205 487 4262. If you wish to know more about our company, Dos Santos International, please visit our web site at http://www.dossantosintl.com

Joseph Dos Santos, PE ■

Dear Mr. Dany O. Portales,

Silica sand is hard, abrasive and small sized material. I think it will not get degraded (breaking) by impact, turbulence or mutual crushing; when being conveyed by belt (as there are no big lumps, there will not be mutual / self-crushing).

The degradation is generally understood as material breaking during conveying / handling operation. Therefore, in this context there is no degradation. Are you referring to degradation attributed to size segregation when being conveyed. Size segregation if occurring on belt, will again get corrected / mixed up in chute. There should not be size segregation if materal is very fine in size. I hope my answer is in context of your question.

Regards,

Ishwar G Mulani.

Author of Book : Engineering Science and Application Design for Belt Conveyors.

Advisor / Consultant for Bulk Material Handling System & Issues.

Email : parimul@pn2.vsnl.net.in

Tel.: 0091 (0)20 25882916 ■