Module 7 of 9 · A5 · Monitoring and reporting at an aluminium installation
4.PFCs: Method A, slope method
Use this if you record anode effect minutes per cell-day (AEM):
- AEM = anode effects per cell-day × average minutes per effect
- CF4 (t) = AEM × SEF ÷ 1 000 × primary aluminium produced (t)
- C2F6 (t) = CF4 × F_C2F6
Default factors by technology:
| Technology | SEF_CF4 | F_C2F6 |
|---|---|---|
| Legacy Point Feed Pre Bake (PFPB L) | 0,122 | 0,097 |
| Modern Point Feed Pre Bake (PFPB M) | 0,104 | 0,057 |
| PFPB without full automatic intervention (PFPB MW) | own measurement* | own measurement* |
| Centre Worked Prebake (CWPB) | 0,143 | 0,121 |
| Side Worked Prebake (SWPB) | 0,233 | 0,280 |
| Vertical Stud Søderberg (VSS) | 0,058 | 0,086 |
| Horizontal Stud Søderberg (HSS) | 0,165 | 0,077 |
* If own measurement is not feasible, use the CWPB values.
Sources: MA Annex II B.7.1 Equations 21-23, Table 2 p.46; G5e §3.1.2 p.20-21, Table 3-1.