1. Balmer Lawrie & Co. Ltd.
2. Directorate General of Hydrocarbons
3. Petroleum Conservation & Research Association (PCRA)
4. Biecco Lawrie Limited
5. Centre for High Technology (CHT)
6. Oil Industry Safety Directorate (OISD)
7. Petroleum Planning & Analysis Cell (PPAC)
8. ONGC Videsh Limited (OVL)
9. Indian Oil Corporation Limited (IOCL)
10. Bharat Petroleum Corporation Limited (BPCL)
11. Oil & Natural Gas Corporation Limited (ONGC)
12. Oil India Limited (OIL)
13. Engineers India Limited (EIL)
14. Chennai Petroleum Corporation Limited (CPCL)
15. Mangalore Refinery & Petrochemicals Limited (MRPL)
16. Bongaigaon Refinery & Petrochemicals Ltd. (BRPL)
17. Numaligarh Refinery Limited (NRL)
18. Petroleum and Natural Gas Regulatory Board (PNGRB)