Compressor Casing Revamping

Original Casing Design – Faulty contact pressure distribution

New Revamped Casing Design

Corrected contact pressure distribution

ApplicationNitric Acid Production Plant
Compressor TypeHorizontally Split Centrifugal Compressor
ServiceN2 + NOx compression
Disch. Pressure11.5 bar


Gas leakage between upper and lower semi-casings


  • RCA indicated a reduction of contact pressure due to corrosion and wrong maintenance
  • Static FEA to determine contact pressure distribution
  • Increased stud bolts diameter, added new tie rods


Restored contact pressure thus eliminating dangerous gas leakages