With reference to the A-Scan plot, the blue dashed line is the “call level”, this was set to a level of 3% and none of the support echoes exceed this level so they were not called. It is worthwhile noting that the amplitudes of the echoes from the contact supports at 1.8m, 9.7m and 17.4m are increased because at these positions the load, which is caused by the weight of the pipe, is relatively high.