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Comparison of Vee and Flat Belt Drives


Conversion Of V-Belts To Flat Belts
Dust Collector Equippment
Indian Oil Corporation

The V-Belt Drive The Flat Belt Drive
1. Frictional Engagement between the lateral wedge surfaces require a large cross-section and high stiffness of V-belts 1. Frictional Engagement on the outer pulley surface require only a small section and make flat belts very flexible
2. High Energy loss due to cyclic bend 2. Negligible energy loss due to cyclic bending
3. V-belts are wedging in the grooves and pulling out from grooves 3. No grooves requred, consequently no wedging in and pulling out from grooves
4. Energy loss and high wear 4. No energy loss and negligible wear
5. Frcitional Engagement between lateral wedge surfaces of the belt profile 5. Frcitional Engagement on the outer pulley diameter
6. Large bending cross-section, large mass 6. Small bending cosss-section, small mass.
7. Different effective diameters and thus varying speeds of individual belts 7. Precisely, defined effective diameters across the belt width and therefore exact speeds
Data needed for designing / converting Vee Belt Drive Flat Belt Drive
Drive Efficiency Comparison between Vee Belt and Flat Belt Drives

Consequential benefits of the flat belt drive:

  • Higher Efficiency, hence considerable energy savings
  • Longer service life of belts and pulleys
  • Cleaner operation, longer service life of air filters
  • Longer service life means less downtime and higher productivity
  • Constant tension, no re-tension required, maintainence free
  • Smoother operation, lower noise generation

Flat Belt Conversion Pay Back Calculations

1. Fan drive to be converted to Flat drive 15 KW
2. Actual service factor of usage 0.80
3. No. of Hours of Opertation per day 16 Hours
4. No. of Hours of Opertation per year 300 Days
5. Power Traffic Per Unit Rs. 8
6. Expected Savings By Conversion 5%
Annual Savings
= KW x Serv Factor x % savings x Hrs/day x No of days x Tariff
= 15 x 0.8 x 0.05 x 16 x 300 x 8
= Rs 23,040 per year
Cost of replacement of Vee belts per annum = Rs 4,000
Total annual savings
= Power savings + Vee belt replacement cost
= Rs 23,040 + Rs 4,000
= Rs 27,040 per year
Cost of installation of Flat belt system including Belt and Pulleys = Rs 33,000
Pay back = Cost of replacement / operational savings
= Rs 33,000 / Rs 27,040
= 1.22 years or 15 months
Anticipated savings in 4 years ( expected life of Flat belt is 4 years )
= Rs 27,040 x 4
= Rs 108,160