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Babcock-Hitachi K.K.

Hitachi

Application of High Precision Inspection System

Application of High Precision Inspection System
Inspection System/Technique Description (Effect) Applicable Unit
ELFOSS UT Evaluates defects at narrow tube stand and inside of welded parts by scanning convergence beam fanwise.
  • High precision detection of internal defects on thick wall of main piping.
  • Realization of inspection of narrow parts and discontinuous parts in.
 Main piping, header, drum
Boiler tube UT system Measures thickness from inner surface heat exchanger tube and defects at welded parts.
  • Realization of wide-range inspection.
  • Reduction of enormous amount of appurtenant work.
 Heat exchanger tube
ADIN UT system Detects micro defects along perimeter of tube from inner surface of heat exchanger tube using 16-channel UT sensor.
  • Realization of wide-range pitting corrosion inspection on horizontal heat exchanger tube.
  • Reduction of enormous amount of appurtenant work.
 Heat exchanger tube
Fin tube UT system Measures fin tube thickness and detects defects with ultrasonic wave.
  • Realization of entire inspection which has been difficult to inspect fin tube.
  • Reduction of appurtenant work.
 Fin tube (HRSG, GGH)
Corrosion fatigue defect detection MT system Makes quantification evaluation of corrosion fatigue cracks on inner surface using defective leakage flux.
  • Corrosion fatigue defect detection on inner surface of tube from inside of furnace is available.
  • General examination is available.
  • Reduction of appurtenant work.
 Waterwall tube
Corrosion fatigue defect detection rear surface UT system. Detects defects on welded parts of fitting attached to outer surface of furnace of waterwall, from inside of furnace.
  • Corrosion fatigue defect detection on inner surface of tube from inside of furnace is available.
  • General examination is available.
  • Reduction of appurtenant work.
 Waterwall tube
Boiler attemperator inspection system Widely inspects inside of attemperator using camera inserted through inspection hole of 60 in diameter.
  • Reduction of appurtenant work.
  • High precision general examination of attemperator is available.
 Attemperator
Steam oxidation scale thickness measurement system. Measures steam oxidation scale thickness on inner surface of tube with ultrasonic wave, from outer surface.
  • More precise and wider-range inspection than extraction is available.
  • Life management in consideration of heat exchanger tube scale is available.
 Heat exchanger tube,
Main piping
Coil deep part inspection system Visually inspects reduction of thickness of deep parts of coil and measures thickness.
  • Inspection, having been difficult to inspect coil deep parts, becomes easy to do it.
  • A wide range of inspection is available without appurtenant work.
 Horizontal heat exchanger tube
Local thickness-reduced part thickness measurement system. Detects local thickness reduction at narrow parts with micro ultrasonic sensor and measures thickness.
  • Examination, having been impossible to measure thickness at local thickness-reduced part, becomes possible to do it.
 Waterwall tube,
Heat exchanger tube
Coil contact wear part inspection system. Measures thickness of local thickness-reduced parts at coil contact wear part with micro ultrasonic sensor.
  • Reduction of enormous amount of appurtenant work (Widening tube).
 Heat exchanger tube
Elephant-skin depth measurement system. Measures elephant-skin with eddy current.
  • Possible to measure a wide-range elephant-skin depth.
 Waterwall tube,
Heat exchanger tube
Boiler layer tube narrow part inspection system Measures thickness of narrow parts of layer tube with tube-to-tube clearance of 15 mm by remote control.
  • Inspection, having been difficult to inspect narrow parts of layer tube, becomes easy to do it.
  • Wide-range of inspection is available without appurtenant work.
 Layer tube (Fluidized-bed boiler)
Ash erosion inspection system
(Laser sheet method).		 Inspects ash erosion by optical technique at high speed.
  • Reduction of enormous amount of appurtenant work.
 Horizontal heat exchanger tube

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