| 钢罐等级影响分析 | 极差范围 | 占比 | |
| [0, 12] | >12 | ||
| A类 | 60 | 35 | 37% |
| B类 | 1 | 1 | 50% |
| C类 | 4 | 3 | 43% |
| D类 | 9 | 7 | 44% |
| B + C + D类 | 14 | 11 | 44% |