Apparatus for inspecting a heat exchanger tube and group of heat exchanger tubes

An apparatus for non-destructively inspecting an arbitrary heat exchanger tube among a group of heat exchanger tubes in which a multiplicity of heat exchanger tubes are arranged, the apparatus comprising:

• a radiation detector inserted in a heat exchanger tube to be inspected,
• at least one radiation source set in the interior of a plurality of heat exchanger tubes and additionally disposed simulated heat exchanger tubes surrounding the heat exchanger tube to be inspected, and
• a CT processing unit for subjecting radiation strength signals detected by the radiation detector to a CT processing,
• whereby a cross section of the heat exchanger tube to be inspected is imaged by the CT processing.

An apparatus for non-destructively inspecting a group of heat exchanger tubes in which a multiplicity of heat exchanger tubes are arranged, the apparatus comprising:

• at least one radiation source set in at least one of the positions selected from a position in an inner portion of the heat exchanger tube, a position on the inner side of the group of heat exchanger tubes or a position on the outer side of the group of heat exchanger tubes,
• at least one radiation detector carrying a collimator set in a position on the outer side of the group of heat exchanger tubes so that radiations emitted from the radiation source can be detected by the collimator-carrying radiation detector over substantially the whole circumference of the group of heat exchanger tubes, and
• a CT processing unit for subjecting radiation strength signals detected by the collimator-carrying radiation detector to a CT processing,
• whereby a cross section of the group of heat exchanger tubes is imaged by the CT processing.