Assessment of Duration of Activity Hazard
| Hazard | Sub-Factors | Description and Reason | Weighting/Score |
|---|---|---|---|
| Duration of activity severity and probability | Nonprocessing | For nonprocess rooms, no activity within the room has any measurable impact upon the process. Therefore, no weighting is afforded. | 0 |
| Short duration | Short duration refers to the process step in the room lasting for less than 30 min. As a relatively short time frame, a relatively low weighting (with respect to the medium and long durations) is afforded. | 1 | |
| Medium duration | Medium duration refers to the process step in the room lasting for more than 30 min but for less than 2 h. As a relatively longer time frame than a short duration but a relatively shorter time frame than a long duration, the middle weighting (with respect to the short and long durations) is afforded. | 2 | |
| Long duration | Long duration refers to the process step in the room lasting for longer than 2 h. As the largest time frame, a relatively high weighting (with respect to the short and medium durations) is afforded. | 3 |