Cryostat - the largest vessel of it's kind in the world.

 

CAD model of the cryostat split into four sections, the delivered base section to ITER and the lower and upper cylinder cocooned and kept ready at ITER site
CAD model of the cryostat split into four sections, the delivered base section to ITER and the lower and upper cylinder cocooned and kept ready at ITER site

Often termed as the world’s largest thermos, the cryostat is a 30 m tall and 30 m diameter outer vacuum shell of the ITER machine to insulate the machine and its components. It is a 54 piece puzzle manufactured by M/s L&T Hazira and assembled at the cryostat workshop of ITER-India at the ITER site. Key technologies include:

  • Welding across different thickness, ranging from 20mm to 200mm and ensuring dimensional control within 0.3% tolerance
  • Special handling of large pieces ~ 100 Tons each, development of dual operator technique to control distortion in T welds and special Hot wire TIG welding for heavy thickness 
  • Weld inspection by Ultrasonic method for thick welds
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