Inspection Division Engineering Division
  Aker Solutions India Sdn Bhd   Defence Research & Development Orgn (DRDO)
  Alston Infra Projects   Advanced Naval Systems Programme (ANSP)
  BJ Shirke   Armament Research and Development Establishment
  Bridge And Roof Ltd   Advanced Systems Laboratory (ASL)
  Control union Testing And Inspection   Defence Research & Development Laboratory (DRDL)
  Coromandel International Ltd.   Usai Forge (P) Ltd.
  Gujarat State Petroleum Corporation   BEML Limited, Bangalore
  Hindustan Petroleum Corporation Ltd.  
  John Energy  
  Kakinada Marine & Offshore Comples Ltd.  
  Majjan Equipment And Machinery Llc.  
  Oil And Natural Gas Corporation Ltd.  
  Oil India Ltd.  
  Punj Lioyd Ltd.  
  Reliance Gas Transportation Infrastructure Ltd.  
  Reliance Industries Ltd. (Gadimoga)  
  Reliance Industries Ltd. (Vakalpudi)  
  SB Darron Pte Ltd.  
  SG Shirke Construction Technology Pvt. Ltd  
  Sri Surya Engineering Works  
  Sri Ramdas Motor Transport Ltd.  
  Srinivasa Transport  
  Swamina International Pvt. Ltd.  
  Sharpooji Pallionji & Co. Ltd.  
  SGS India Pvt. Ltd.  
  Visakhapatnam Steel Plant  
And many more......