Table C.12—Charpy Impact Test Specimen Requirements for Couplings, Coupling Stock
Coupling Material, Coupling Blanks, and Accessory Material for grade  C90
Label 1 API Connection Type and CVN Specimen Orientation, Size, and Energy
Special-clearance b
NUEUEUBCBCLCSC
12345678
1.05aL-5-22
1.315L-5-22L-7-32
1.66L-5-22L-5-22
1.9L-5-22L-7-32
2 3/8L-7-32L-7-32L-7-32
2 7/8L-10-40L-10-40L-10-40
3 1/2T-5-11T-5-11T-5-11
4T-7-16T-7-16
4 1/2T-7-16T-7-16L-7-32T-7-16T-7-16
5T-5-11T-7-16T-10-20
5 1/2T-5-11T-7-16T-10-20
6 5/8T-10-20T-10-20T-10-20
7T-7-16T-10-20T-10-20
7 5/8T-10-20T-10-21T-10-22
8 5/8T-10-20T-10-22T-10-23
9 5/8T-10-20T-10-22T-10-23
10 3/4T-10-20T-10-22T-10-23
11 3/4T-10-22T-10-23
13 3/8T-10-22T-10-23
16
18 5/8
20
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) according to the following code; The absorbed energy requirement is 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 Not thick enough to test.
b The information in this table assumes that special clearance couplings are machined from regular coupling blanks.

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