| Table C.10—Charpy Impact Test Specimen Requirements for Couplings, Coupling Stock, |
| Coupling Material, Coupling Blanks, and Accessory Material for Grades J55 and K55 |
| Label 1 | API Connection Type and CVN Specimen Orientation, Size, Energy, and Temperature Reduction |
| | Special Clearance b | | | |
| NU | EU | EU | BC | BC | LC | SC |
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| 1.05 | a | L-5-15-A | — | — | — | — | — |
| 1.315 | L-5-15-A | L-7-22-A | — | — | — | — | — |
| 1.66 | L-5-15-B | L-5-15-B | — | — | — | — | — |
| 1.9 | L-5-15-A | L-7-22-B | — | — | — | — | — |
| 2 3/8 | L-7-22-A | L-7-22-A | L-7-22-A | — | — | — | — |
| 2 7/8 | L-10-27-A | L-10-27-A | L-10-27-A | — | — | — | — |
| 3 1/2 | T-5-11-E | T-5-11-E | T-5-11-D | — | — | — | — |
| 4 | T-7-16-B | T-7-16-B | — | — | — | — | — |
| 4 1/2 | T-7-16-B | T-7-16-B | — | L-7-22-A | T-7-16-A | T-7-16-A | T-7-16-A |
| 5 | — | — | — | T-5-11-C | T-7-16-A | T-10-20-A | T-7-16-A |
| 5 1/2 | — | — | — | T-5-11-C | T-7-16-A | T-10-20-A | T-10-20-A |
| 6 5/8 | — | — | — | T-10-20-A | T-10-20-A | T-10-20-A | T-10-20-A |
| 7 | — | — | — | T-7-16-A | T-10-20-A | T-10-20-A | T-10-20-A |
| 7 5/8 | — | — | — | T-10-20-A | T-10-20-A | T-10-20-A | T-10-20-A |
| 8 5/8 | — | — | — | T-10-20-A | T-10-20-A | T-10-20-A | T-10-20-A |
| 9 5/8 | — | — | — | T-10-20-A | T-10-20-A | T-10-20-A | T-10-20-A |
| 10 3/4 | — | — | — | T-10-20-A | T-10-20-A | — | T-10-20-A |
| 11 3/4 | — | — | — | — | T-10-20-A | — | T-10-20-A |
| 13 3/8 | — | — | — | — | T-10-20-A | — | T-10-20-A |
| 16 | — | — | — | — | T-10-20-A | — | T-10-20-A |
| 18 5/8 | — | — | — | — | T-10-20-A | — | T-10-20-A |
| 20 | — | — | — | — | T-10-20-A | T-10-20-A | T-10-20-A |
| NOTE In this table, the specimen orientation (T or L) is followed by the minimum specimen size (10, 7, or 5) which is followed by the minimum absorbed energy requirement (joules) and the temperature reduction (A, B, C, D, or E), according to the following code; Both the absorbed energy requirement and the test temperature reduction requirement are adjusted for the test specimen size indicated; Orientation and specimen size is calculated on coupling material/stock wall and not coupling critical thickness. |
| T is the transverse specimen orientation (see Figure D.11). L is the longitudinal specimen orientation (see Figure D.11). 10 = full-size (i.e. 10 mm ´ 10 mm) |
| 7 = 3/4-size (i.e. 10 mm ´ 7.5 mm) |
| 5 = 1/2-size (i.e. 10 mm ´ 5 mm) A = No temperature reduction |
| B = 3 °C reduction C = 6 °C reduction D = 8 °C reduction |
| E = 11 °C reduction |
| a Not thick enough to test. |
| b The information in this table assumes that special clearance couplings are machined from regular coupling blanks. |
