| Material diameter (nominal) | Company A | Company B | ||
| Blockages (total) | Blockage rate (per 100 km/year) | Blockages (total) | Blockage rate (per 100 km/year) | |
| 100 | 235 | 29.59 | 50 | 65.20 |
| 150 | 6,195 | 15.18 | 13,705 | 23.55 |
| 225 | 1,015 | 7.12 | 772 | 11.83 |
| 300 | 42 | 1.69 | - | - |