- Anatrade Ltd. - Nigeria
- Associated Engineers - Baroda
- Bharat Petroleum Corporation Ltd. - Chennai, Kolkata,Noida,Mumbai
- Essar Projects India Ltd.
- Galfar Al Misnad Engineering & Contracting WLL. -Qatat (Qatar Petroleum)
- Gas Authority of India Ltd.- Pata
- Geeta Valves and Engineering(P) Ltd.
- Gujarat Electricity Board
- Gujarat State Fertilizers and Chemicals
- Hindustan Petroleum Corporation Ltd. - Mumbai
- Indian Oil Corporation Ltd. - Chennai , New Delhi, Kolkata, Noida, Mumbai
- Indian Oil Corporation Ltd. - Mathura, Bongaigaon, Haldia
- Indian Petrochemicals Corporation Ltd.
- Larsen & Toubro Ltd.- Baroda
- Mangalore Refinery & Petrochemicals Ltd.
- PetroPeru-Talara Refinery Project (Peru-S.A.)
- Projects & Developement India Ltd. - Noida
- Reliance Gas Transportation Infrastructure Ltd.
- Reliance Industries Ltd - Dahej, Hazira, Nagothane, Jamnagar, Baroda
- Reliance Industries Ltd - Kakinada (KGD6)
- Reliance Jamnagar Infrastructure Ltd.
- Reliance Petroleum Ltd. - SEZ -Jamnagar
- Sarsan Oilfield Supplies Centre- Dubai
- Speciliased Oilfield Supplies- Kuwait (Kuwait Oil Company)
- Toyo Engineering India Ltd