Volume-II of IV - GAIL

Pipe Size, Outside
diameter
Inches
Tensile
API
Table-I
TYPE AND NUMBER OF TEST SPECIMENS FOR
PROCEDURE QUALIFICATION TEST
Tensile
ISO
Nick
Break
Root
Bend
Number of Specimens
Face
Bend
Side
Bend
Wall Thickness > ½ inch (12.7mm) and under
Macro Hardness
Impact Total
Under 2 3/8 0 0 2 2 0 0 0 0 0 4
2 3/8 to 4½ incl. 0 0 2 2 0 0 0 0 0 4
Over 4½ less than
12 3/4
2 0 2 2 2 0 2 2 12 24
12 3/4 and over 2 2 4 4 4 0 2 2 24 44
Wall Thickness > ½ inch (12.7mm)
4½ and smaller 0 2 0 0 0 2 0 0 0 4
Over 4½ less than
12 3/4
2 0 2 2 2 0 2 2 12 24
12 3/4 and over 2 2 4 0 0 8 2 2 24 44
1.2 Tensile Strength
Specimens for pipe diameter over 12 3/4" shall be taken from the
position indicated in Fig. 1 of this specification. Two API type specimen
shall be taken for pipe diameter greater than or equal to 12 3/4".
1.3 Nick-Break Test
1.3.1 Preparation
Specimens for nick-break test with notches thus worked can break in
the base metal, instead of in the fusion zone; therefore an alternative
test piece may be used after authorisation by the COMPANY with a
notch cut in the reinforcement of outside weld bead to a maximum
depth of 1.5mm measured from the surface of the weld bead.