Criticality In Fabrication

• Layout preparations for petals of Hemisphere.
• Petals Cutting and forming for R-1065 and thk 30mm 6 nos. for upper and lower half hemisphere each.
• Fit up of hemisphere and L/seam welding and controlling the R-1065 within 1 mm and its height during welding.
• Lower and Upper half welding and maintain height during C/Seam welding.
• N2 Nozzle and N3 Nozzle welding with Sphere and maintain its individual concentricity and perpendicularity with N1 Nozzle and Middle forging.(It should be within 1mm)
• N4 welding with outer shell and its UT examination by ILTR probe.
• Concentricity of Top Flange, Middle Forging and Bottom N1 Nozzle. We have achieved this within 3 mm. It is very huge assembly having height 5270 mm and sphere O.D.2190 mm.
• Fixture design for the middle C/seam welding ( Top assembly with Sphere welding)
• RT of the N2 and N3 nozzle.