Reg. 347 C Reg. 347 D, Reg. 347 E
Bend test on the weld
| A strip not less than 38mm. (1-1/2 in.)
Wide cut circumferentially from one end of each selected
pipe with the weld near the middle of the strip, shall
when cold withstand, without showing either crack or flaw,
being doubled over in the direction of original curvature
round a bar, the diameter of the bar being equal to eight
times the thickness of the test piece, the weld being
placed at the point of maximum bending.
In cases where the outside diameter of the pipe is less
than 8 times the wall thickness, the diameter of the former
shall be equal to 4t or 2/3rd of the nominal bore of the
pipe, whichever is less.
| Should a pipe selected for testing
fail in any one or more of the tests specified above,
two further tests of the same kind may be made from
the same or another pipe from the same batch. Should
either of these further tests fail, the pipes represented
may be reheat treated and then re-tested. If the
repeat tests are satisfactory, the pipes shall be
accepted provided they comply with other requirements
but if failure again occurs, the pipes which the
test pieces represent shall be rejected.