09091960,
This is a good photo. This is not a crack!, it is a lamination, much different than a crack. I would not assess these, there is no integrity threat here, if you wish you can buff these out of the pipe, but there is not much use in this as the area you buff will be larger than the original indication area. The only potential problem from laminations is if they may be through welds, or are not planar in the mid-wall, so are not consistent depth in the wall of the pipe, and usually you can get UT readings to confirm this. Why your NDE contractor is classifying these as cracks or crack like and does not know what they are is poor knowledge. If you must assess, (I am not sure how you are going to get a depth of something like this with out buffing as it is probably too shallow to be out of the dead zone with UT, in which case you are completing your standard effective area calculation after buffing), I would take the axial length of the longest part of the crack, not the entire circumference. Remember, the pipe will be full of these internally as well, you just can’t detect them with MT, but you will see them with UT.