Dear A Banarjee

you will get variable capacity by changing the feed rate to the conveyor .

you have to see feeding should not be more than desired filling factor .

in case lot of variation in capacity you can provide variable speed drive to maintain desired filling

A R SINGH ■

A variable speed conveyor is the answer that I assume you are looking for, however like all things you need to start it and stop it and maintain a perfect feed.

Expecting the material to assume a 60 or 70% fill after the feed has been shut off for whatever reason is (pardon the pun) a pipe dream. The material will simply run back to the tail.

A similar condition will occur during start where the lightly loaded front section will run back to form a plug either stopping the conveyor or causing damage. You should look at other solutions that specifically cater for these angles. ■

Sirs

There is not a single answer to this question it depends on characteristics of material being carried, fill level and speed.

Some materials would go up 30-35 deg with low fill where as some require a good fill, some material will run back on themselves and in this case require a plug to come along to carry the material along.

Some fluid materials can only be carried at max 5 deg even in a pipe conveyor (but would not be possible at all with open trough).

Either way a variable speed drive allows for fine tuning to get the balance right with problematic materials.

Paul Holt

AMCO Group Ltd. UK ■

Hi All,

If I understood Mr. Banerjee , we could say that the maximum vertical inclination of the pipe will strongly depend of its filling grade.

That means we could think in a minimum aceptable pipe filling grade for a given inclination to be overcomed....

Is this right???

Regards

Alexandre C. Calijorne ■

Dear Sirs

No really, the most important factor is the material being handled, as said before some will go up 30 deg easily, some will go up only 5 deg.

In either case it is possible to make it either better or worse by varying the speed to change the fill level.

Paul Holt

AMCO Group Ltd. ■

The discussion seems to be more about conveying angle then the capacity of a pipe conveyor. A pipe conveyor is not a high-angle conveyor any more than an open trough conveyor, unless you want to ignore the material movement and back-sling because you don't see it. The wear and tear and increased running resistance (when the material plugs the cross-section) will occur whether you can see it or not.

Joe Dos Santos ■

True, a pipe conveyor is not dedicated for high angle conveying but will transport materials at higher angles than conventional conveyor sometimes 50% more depending on the material.

Also in the event that there is runback the material is still contained.

Also any situation that arise with plugging or runback causes negligable wera over the life of the belt, but of course the totalk characteristics are very different with different materials. ■