Belt Scale Applications made easy even in demanding Environments
What if you could reduce a time-consuming, complicated task from every other day to once a month? An integrated solid waste management company in India tried just that. Organic waste from the local municipality arrives at the company's facility and is loaded onto a conveyor. The company uses a belt scale to control and totalize the feed of material. The totalized amounts are used to calculate the price of waste from the city, so the company required accuracy and reliability.
Named the Best Industrial Scale 2014 in International Weighing Review Readers’ Choice Awards, Siemens Milltronics MSI belt scale is proven in a wide range of applications worldwide. From controlling and totalizing the weight of organic waste to monitoring the flow of extracted gold ore, this belt scale provides a powerful solution to two diverse companies.
Garbage into green Energy
What if you could reduce a time-consuming, complicated task from every other day to once a month? An integrated solid waste management company in India tried just that: Organic waste from the local municipality arrives at the facility and is loaded onto a conveyor. The process involves removing metals and waste other than food scraps, animal waste, and yard materials. This organic waste is then fed into an incinerator as a fuel for electricity generation. Every day, the company processes 100 tons of municipal solid waste, which generates four megawatts of energy.
The company uses a belt scale to control and totalize the feed of material. The totalized amounts are used to calculate the price of waste from the city, so the company required accuracy and reliability when weighing the organic waste. However, waste material is difficult to weigh due to light loading, sudden changes in bulk density of the material, and other material handling issues that arise. For example, often material is trapped under the conveyor’s side skirts or falls on the load cells or belt scale, causing errors in measurement.
The previous belt scale was not robust enough for the application, as the existing load cells were easily damaged and the trapped material required frequent calibration. Technicians were tending to the belt scale every other day – and even then the unit’s accuracy would drift.
New Way to accurately weigh
The company decided on Siemens belt weighing technology, which includes a MSI belt scale, BW500/L integrator, and SITRANS WS300 speed sensor. Operators installed the belt scale with the assistance of Siemens India weighing experts, who provided advice for the correct location of the scale, ways to avoid trapped material or buildup, and appropriate selection of a product to fit the demanding conditions.
Heart of the system: BW500/L integrator.
The scale was installed on a trial for one month and tested in comparison to independent truck scales to confirm its accuracy. The MSI belt scale has an accuracy of 0.5%, with repeatable results for all of the facility’s waste material measurements.
What did the company gain from this Siemens weighing solution?
Maintenance time savings: Operators now check on the belt scale once a month rather than every other day – this represents a savings of 300 hours every year!
A rugged belt scale system: The load cells on previous scale systems were mounted outside of the conveyor frame, but this puts them in the line of fire for material spillage. As well, some operators used these load cells as a useful foothold while climbing onto the conveyor to remove blockages, thereby damaging the load cells.
Local expertise: Siemens India weighing experts helped throughout the entire purchase and installation process. The Milltronics MSI belt scale is now also manufactured locally in India (in addition to its existing Canadian, Chinese, Australian, and South African production), so industry in India has expert instrumentation partners for any support needed.