Table I – Determination of Fresh Air Flow
| a) Calculation of the fresh air flow based on the maximum number of people and machines with diesel combustion engines: QT = (Q1 x n1) + (Q2 x n2) where: QT = total fresh air flow in m³/min Q1 = amount of air per person in m³/min (in coal mines = 6.0 m³/min; in other mines = 2.0 m³/min) n1 = number of people in the work shift Q2 = 2.65 m³/min/hp (horsepower) of diesel engines n2 = total horsepower of diesel engines in operation |
| b) Calculation of the fresh air flow based on explosive consumption: QT = 0.5 x A x V / t where: QT = total fresh air flow in m³/min A = total amount in kilograms of explosives used per detonation V = gas volume generated per kilogram of explosive in m³/kg t = ventilation (reentry) time of the front in minutes |
| c) Calculation of the fresh air flow based on the monthly tonnage dismantled: QT = q x T where: QT = total fresh air flow in m³/min A = total amount in kilograms of explosives used per detonation q = air flow in m³/min for 1,000 tons dismantled per month (minimum of 190 m³/min/1,000 tons/month) T = production in tons dismantled per month |
Table II – Sizing of CIPAMIN
| Number of Employees in the Establishment | 15 to 30 | 31 to 50 | 51 to 100 | 101 to 250 | 251 to 500 | 501 to 1,000 | 1,001 to 2,500 | 2,501 to 5,000 | Above 5,000 for each additional group of 500 |
|---|---|---|---|---|---|---|---|---|---|
| Number of primary employer representatives | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | – |
| Number of alternate employer representatives | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | – |
| Number of primary employee representatives | 1 | 2 | 3 | 4 | 5 | 6 | 9 | 12 | 4 |
| Number of alternate employee representatives | 1 | 1 | 1 | 1 | 2 | 2 | 3 | 4 | 2 |
Table III – Number of Workers to be Sampled Based on the Number of Workers in the Similar Exposure Group
| N* | n |
|---|---|
| 8 | 7 |
| 9 | 8 |
| 10 | 9 |
| 11-12 | 10 |
| 13-14 | 11 |
| 15-17 | 12 |
| 18-20 | 13 |
| 21-24 | 14 |
| 25-29 | 15 |
| 30-34 | 16 |
| 35-39 | 17 |
| 40-50 | 18 |
| ABOVE 50 | 22 |
Where:
N = number of workers in the Similar Exposure Group
n = number of workers to be sampled
- if N is less than or equal to 7, n = N