Belt Conveyor Capacity: How to Calculate TPH and Select the Right System
Belt conveyor capacity is the main factor in designing a conveyor system for material handling. If the conveyor is too small, it won’t be able to do the required material flow. Also an oversized system can create unnecessary expense for equipment, energy and maintenance. The capacity of a conveyor is generally measured in tons per hour (TPH). This figure shows the quantity of material that a belt conveyor can transport from one place to another in an hour.
The right choice of conveying capacity is important for smooth and reliable flow of materials in industries like mining, cement, steel, power generation, ports and other bulk material handling applications.
What Is Belt Conveyor Capacity?
Belt conveyor capacity refers to the maximum quantity of material that a conveyor can transport in a given time period, usually expressed in TPH.
The actual capacity will depend on a number of factors including:
- Width of belt
- Speed of belt
- Bulk density of material
- Loading of cross section
- Conveyor inclination
- Loading of cross section
- Operating conditions
For example, a coal conveyor will have different capacity requirements than a conveyor handling iron ore, limestone or clinker. Therefore, the conveyor capacity should always be calculated for the actual material and operating conditions.
How Is Belt Conveyor Capacity Calculated?
A basic approach to estimating belt conveyor capacity is based on the amount of material carried by the belt and the speed at which the belt moves.
A commonly used relationship is:
Q = 3.6 × A × V × ρ
Where:
- Q = conveyor capacity in tonnes per hour (TPH)
- A = cross-sectional area of material on the belt in m²
- V = belt speed in m/s
- ρ = bulk density of the material in tonnes/m³
The cross-sectional area depends on the belt width, troughing arrangement and the loading condition of the material.
In practical conveyor design, additional factors are considered to account for the material characteristics, belt loading and operating conditions. Therefore, the formula should be treated as a capacity estimation method rather than a substitute for detailed engineering calculations.
Example of Belt Conveyor TPH Calculation
Let an example,a conveyor is designed to transport a bulk material with the following approximate conditions:
- Material bulk density: 1.2 tonnes/m³
- Belt speed: 2 m/s
- Material cross-sectional area: 0.20 m²
Using the basic relationship:
Q = 3.6 × 0.20 × 2 × 1.2
Q = 1.728 TPH
This simple example shows the relationship between the material loading, belt speed and the density. In an actual industrial conveyor system the loading area and other design parameters would be based on detailed engineering calculations.