No. Ultrasound requires direct contact with the pipe itself.  Typically, the removal of a 9-12 in. width of insulation is sufficient.  For larger piping systems, removing only the bottom half or less may be required, rather than the entire circumference – especially where a specific area of interest exists.

Metal jacketed insulation adds difficulty to any investigation, and should be removed in advance.  Asbestos insulation must be properly abated in the areas specified for testing.  Pipe having a heavy outer plastic or vinyl jacket must have that jacket removed in the areas tested.  For many investigations, the removal and replacement of the insulation presents a significant impediment and additional cost.