Table 5. Risk assessment using FMEA for the factors of ethanol recycling extraction process.
| Cause | Factors | Severitya | Occurrenceb | Detectabilityc | RPN |
| Material | Panax notoginseng amount | 3 | 1 | 1 | 3 |
| Particle size distribution | 1 | 2 | 1 | 2 | |
| Particle shape | 1 | 1 | 2 | 2 | |
| Extraction | Extraction Temperature | 3 | 1 | 1 | 3 |
| Extraction Time | 4 | 2 | 1 | 8 | |
| Reflux rate of ethanol | 3 | 2 | 2 | 12 | |
| Solvent | Ethanol consumption | 4 | 1 | 1 | 4 |
| Ethanol concentration | 4 | 2 | 2 | 16 | |
| Environment | Temperature | 1 | 1 | 1 | 1 |
| Pressure | 1 | 1 | 1 | 1 | |
| Humidity | 1 | 1 | 1 | 1 | |
| Equipment | Mix condition | 2 | 1 | 1 | 2 |
| Heat capacity | 2 | 2 | 1 | 4 |
a
Severity: 1, no impact; 2, small impact; 3, moderate impact; 4, remarkable impact.
b
Occurrence: 1, seldom occur; 2, sometimes occur.
c
Detection: 1, can be detected easily; 2, can be detected with difficulty.