Machine Design
If P1 and P2 are the tight and slack side tensions in the belt, then the initial tension Pi (according to Barth) will be equal to (Where, Pc is centrifugal tension)

[(√P1 + √P2)/2]²
⅟₂× (P1 + P2)
P1 + P2
[⅟₂ × (P1 + P2)] + Pc

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Machine Design
In replacing the V-belts, a complete set of new belts is used instead of replacing a single damaged belt because

New and old belts will cause vibrations
The new belt will carry more than its share and result in short life
Belts are available in sets
Only one belt cannot be fitted with other used belts

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