ASTM A106 2006a, flattening test

[sjrfc2]

Does anyone know why the flattening test in A106 was moved to a supplementary (S3) test in the 2006a version of the spec as opposed to the previous mandatory test?

 

[PAN]

Flattening test may not be necessary for seamless pipe.
Please consider ASTM A53 for comparison.

 

[sk10009]

Flattening test gives a good evaluation of the weld area ductility and can occasionally alert you to the presence of bond line defects so seamless carbon steel pipe,A106,doesn't need to be tested.