Hoist motion hours per day
$$ hoist_{hours_{day}} = {{( hook_{cycles} \cdot hook_{travel} \cdot cycles_{hour} \cdot hours_{operating} ) \over \left({ v_{hoist} \cdot 60 }\right)}} $$
Hoist motion cycles per day
$$ hoist_{cycles_{day}} = {hoist_{hours_{day}} \cdot cycles_{hour}} $$
Class of utilisation for the crane as a whole
| Class of utilisation | Max. number of operating cycles | Remarks |
| U1 | 3.2 x 104 | Infrequent use |
| U2 | 6.3 x 104
| Infrequent use
|
| U3 | 1.25 x 105
| Infrequent use
|
| U4 | 2.5 x 105
| Fairly frequent use |
| U5 | 5 x 105 | Frequent use
|
| U6 | 1 x 106
| Very frequent use |
| U7 | 2 x 106
| Continuous or near continuous use |
| U8 | 4 x 106
| Continuous or near continuous use
|
| U9 | > 4 x 106
| Continuous or near continuous use
|
Total service cycles
$$ crane_{cycles} = {hoist_{cycles_{day}} \cdot hoist_{days} \cdot hoist_{years}} $$
