Refinery & Petrochemicals
- Bharat Petroleum Corprn. Ltd, Kochi
- Bharat Petroleum Corprn Ltd, Mumbai
- Bharat Oman Refinery Ltd.
- Chennai Petroleum Corprn Ltd
- Essar Oil Limited
- Haldia Petrochemicals Ltd.
- Hindustan Petroleum Corprn. Ltd, Vizag
- Hindustan Petroleum Corprn. Ltd, Mumbai
- HPCL Mittal Energy Ltd.
- Indian Oil Corprn. Ltd. Baroda
- Indian Oil Corp. Ltd. Panipat
- Indian Oil Corp. Ltd. Mathura
- Indian Oil Corp. Ltd. Guwahati
- Indian Oil Corp. Ltd. Barauni
- Indian Oil Corp. Ltd. Bongaigaon
- Numaligarh Refinery
- Oil India Limited
- Oil & Natural Gas Corprn Ltd.
- ONGC Mangalore Refinery & Petrochemicals
- Reliance Industries Ltd, Baroda
- Reliance Industries Ltd, Hazira
- Reliance Industries Ltd, Nagothane
Steel, Heavy Engineering &Transport
- Airport Authority of India
- Ashok Leyland Ltd
- Bharat Heavy Electricals Ltd
- Essar Steel
- Hindustan Shipyard Ltd
- Hindustan Zinc Ltd.
- National Aluminium Co Ltd
- Shipping Corprn. of India
- Tata Steel Limited
Original Equipment Manufacturers
- Amar Rubber Works
- Brijbasi Hi-Tech Vehicles Limited
- Chhattariya Rubber & Chemicals
- Jyoti Rubber Udyog
- Newage Industries
- Nirmal Rubber Industries
- Kooverji Devshi & Co. Pvt. Ltd.
- Supremax Equipments
- Vijay Fire Vehicles & Pump Ltd.
- Wadia Body Builders
Engineering Consultants
- Aker Solutions
- Engineers India Limited
- Foster Wheeler India Pvt. Ltd.
- Gannon & Dunkerly Co. Ltd
- KSB Engineers
- Mecon Ltd.
- Mott Macdonald
- Punj Lloyd Ltd.
- Bridge & Roof Co. India Ltd.
- Larsen & Tubro Ltd.
- Spack Turnkey Proj. Pvt. Ltd.
- Tata Projects Ltd., Hyderabad
- Tecnimont ICB Pvt. Ltd.
- Toyo Engineering India Pvt. Ltd.
- Tata Consulting Engineers Ltd.
Chemicals & Fertilizers
- Chambal Fertilizers & Chemicals Ltd
- Deepak Nitrite Ltd.
- Fertilizers & Chemicals Ltd
- Gujarat Alkalies & Chemicals, Baroda
- Gujarat Alkalies & Chemicals, Dahej
- Gujarat Narmada Valley Fertilizers Co Ltd
- Gujarat State Fertilizers & Chemicals Ltd
- Indian Farmers Fert. Co-op. Ltd, Kalol.
- Indian Farmers Fert. Co-op. Ltd, Bareilly
- Krishak Bharati Co-op. Ltd, Hazira
- Nagarjuna Fertilizers & Chemicals Ltd.
- National Fertilizers Ltd.
Power
- Adani Power Ltd
- AP Power Generation Corprn Ltd
- Coastal Gujarat Power Ltd (Tata Power)
- Essar Power Ltd
- Gujarat Power Corprn.Ltd
- Gujarat Industrial Power Corprn. Ltd
- Gujarat Urja Vikas Nigam Ltd
- Madhya Pradesh Electricity Board
- Maharashtra State Electricity Board
- Maharashtra State Power Gen Co. Ltd
- National Thermal Power Corp. Ltd.
- Nuclear Power Corprn of India Ltd.
- Rajasthan Vidyut Utpadan Nigam Ltd
- Torrent Power
- UP Rajya Vidyut Utpadan Nigam Ltd
Fire Protection System Contractors
- B. S. Engineers
- Bells Controls Ltd.
- Chetan Engineers
- CME Industries
- DE’s Technico
- Fire Float (India) Pvt. Ltd.
- FMS Systems Pvt. Ltd.