Do CEMA documents give guidance?

http://www.cemanet.org/publications/index.html ■

Try the following link:

http://www.jh.nl/du/bulkconveyors/be...programma.htm#

success ■

Thanks guys but I have all the needed info and formulas for screw feeders and conveyors in the horizontal application, but what I am looking for is when the screw is inclined the material falls back on itself and slips under the flights. There is a higher fill percent at the inlet side and a lower fill percent at the outlet side. Also there is an increase horsepower requirement because it is lifting the material along with conveying it. The screw may even need to turn faster to compensate for all this. This of course is determined by the material you are conveying and so I am stuck with a formula for a horizontal conveyor when I need a inclined conveyor formula. Did I make it a little clearer this time? I think I was going for a short post instead of getting everything on here. ■

It is a fact of life in materials handling that not all the information you would like to have is freely available

A lot of knowledge, usually relating to more complex arrangements, resides with equipment manufacturers and they regard it as commercially confidential

I recall a new Chief Engineer starting and having to look at a problem relating to a screw conveyor having triple start, paddle bladed screw. He asked where was the published standard or book that defined the design methods and power calculations

Actually he lasted longer than we thougth ....... ■

....Or wait for him to see this thread...I would.■

The axial load on a screw reflects the resistance to slip of the material moved, so is a matter of simple mechanics. Moving bulk material up a slope with a screw is more complicated. At low inclinations the contents progressively tend to spill over the centre tube such that capacity reduces quickly at slopes above 20 degrees. At slopes above 30 degrees the mode of operation rapidly changes to require a dynamic system, rather than a gravity flow system, and I would recommend that you leave these applications to specialists. ■