Patent ID: 7552631

Claim:
An apparatus for inspecting vertically supported fluid filled pipe, comprising: an inspection unit having a longitudinal axis and adapted to be connected to a line for lowering into and retrieving from the pipe; a centralizer mounted to the inspection unit, having an outer periphery for slidingly contacting the pipe as the inspection unit moves through the pipe; a rotating time of flight diffusion (TOFD) module carried by the inspection unit and including a pair of rotatably mounted weld volume inspection transducers adapted to inspect for and obtain data on weld volume defects, a rotatable shaft positioned parallel to the longitudinal axis of the inspection unit for rotating the weld volume inspection transducers, and a pair of weld volume inspection transducer mounts connected to the rotatable shaft for carrying the weld volume inspection transducers, each of the weld volume inspection transducers connected to a separate one of the pair of weld volume inspection transducer mounts to rotate during inspection at a circumscribed diameter that is less than the diameter of the centralizer at the periphery; and a wall thickness module carried by the inspection unit and including a plurality of wall thickness inspection transducers adapted to obtain data on wall thickness of a portion of the pipe, the wall thickness inspection transducers during inspection being located at a circumscribed diameter less than the diameter of the centralizer at the periphery.