Month | Temperature of Ambient, ˚C | Defined control standard of joints as to exposing time and MMF | |||||
Hot joint | Warm joint | Cold joint | |||||
Exposed time, hrs | MMF, H.˚C | Exposed time, hrs | MMF, H.˚C | Exposed time, hrs | MMF, H.˚C | ||
1 | 22.8 | ≤16 | 557 | 16 - 28 | 556 - 974 | >28 | >974 |
2 | 22.5 | ≤16 | 552 | 16 - 28 | 552 - 966 | >28 | >966 |
3 | 22.1 | ≤16 | 546 | 16 - 28 | 546 - 955 | >28 | >955 |
4 | 20.9 | ≤20 | 658 | 20 - 30 | 658 - 987 | >30 | >987 |
5 | 18.5 | ≤22 | 671 | 22 - 32 | 671 - 976 | >32 | >976 |
6 | 16.5 | ≤22 | 627 | 22 - 32 | 627 - 912 | >32 | >912 |
7 | 16.4 | ≤22 | 625 | 22 - 32 | 625 - 909 | >32 | >909 |
8 | 18.9 | ≤22 | 680 | 22 - 32 | 680 - 989 | >32 | >989 |
9 | 22.5 | ≤20 | 690 | 20 - 30 | 690 - 1035 | >30 | >1035 |
10 | 24.9 | ≤16 | 590 | 16 - 28 | 590 - 1033 | >28 | >1033 |
11 | 24.4 | ≤16 | 582 | 16 - 28 | 582 - 1019 | >28 | >1019 |
12 | 23.2 | ≤16 | 563 | 16 - 28 | 563 - 986 | >28 | >986 |