PSOXL Motor Casings

  •    Vikram Sarabhai Space Centre
  •      Thiruvananthapuram
  •      12 Sets
  •     Space Division


These are motor casings for the solid booster motors for ISRO's PSLV launch vehicle.

The motor casings are manufactured in 3 main segments, head end segment, middle segment and nozzle end segment, and have forged domes at the head end and nozzle end. The nozzle end is connected to the nozzle convergent and nozzle divergent, which are machined out of forgings. Entire manufacturing and machining of all these segments, along with manufacturing of interchangability drill jig is being completed at Kay Bouvet Engineering

Construction details

Materials: 15CDV6


  • Shell OD: 1000 mm
  • Shell Thickness: 3.5 mm
  • Overall Assembly Length: 11868.5 mm

Critical aspects

  • Max allowable weld mismatch: 0.2mm
  • Pressure test at 70kg/cm2
  • 100% RT with an acceptance criteria for porosity of t/10
  • Controlling of Shell Ovality within 2 mm