Originally Posted by panchanirudha12

Please guide me about volumetric capacity of the conveyor.

There is always debate on how much % utilisation for belt conveyor volumetric capacity.

Normally 90 % utilisation is considered.

Please guide whether this a correct approach or we can go upto 100 % utilisation.

anirudha

Namaskar Anirudha,

The short answer is how wide is the conveyor belt and what is the angle of the idlers BUT:

The transport volume of a given conveyor is going

to depend quite a few integral parts including;

1. the broken size of the material being conveyed.

2. The width of the conveyor belting.

3. the angle of the troughing idlers .

4. the belt speed at work.

5. The angle of repose of the conveyed material.

6. The cross sectional area of the conveyor belt

with the assigned idlers, being the higher

degree of belt idler the smaller the cross

sectional area.

7. The actual heaped volume of said material within

the cross sectional area of the conveyor belt

and its behavior when being transported-being the

material settling while being transported at the desired speed.

8. the angle of ascent the conveyor is expected to travel up or

down as settling will occur faster due to gravity.

There is lots more to examine and I suggest you examine the material at www.CEMA.org ■

The previous responent has given various factors to consider when assessing a material profile on a belt. It seems fairly obvious that it is impractical to run with material trembling on the edges of the belt, particualrly as the belt fluctuates as it passes over idlers, so the margin of comfort has to be decided on a case by case assessment. The essence is to form a stable cross section and a great deal depends on the loading conditions as to how stable the bulk material is during transport. ■

This is a case of ambiguity. The CEMA 100% filling section is based on a material free edge distance of ,0.9+.055 BW. This is considered acceptable margin for the cross-section that corresponds to the absolute maximum conveying load, not the average load. The open item, or source of ambiguity, is the surcharge angle. What is the correct surcharge angle? 100% CEMA load is much larger with a 30 degrees surcharge load than with a 0 degrees surcharge angle. Thus 80% loading with a 30 degrees surcharge is the same a 100% loading with a lesser surcharge angle. Too often I find overland conveyor specifications which call for 80% CEMA load yet specify a surcharge angle of 20 or 25 degrees. This is a contradiction. The surcharge angle is too high and unrealistic effectively defeating the intent of the otherwise conservative margin against overload. ■