| Aban Constructions Limited | | Assam Gas Co. Limited |
 | Bharat Petroleum Corporation Limited |  | Bridge & Roof Co. (India) Ltd. |
 | Cairn Energy | | Engineers India Limited |
| Essar Constructions Limited |  | GAIL (India) Limited |
| Gujarat Gas Co. Limited |  | Hindustan Petroleum Corporation Limited |
| IBP Limited | | Indian Oil Tanking Limited |
 | Indian Oil Corporation |  | IVRCL Infrastructure & Projects Limited |
 | Oil and Natural Gas Corporation Limited | | Petronet India Limited |
| Petronet MHB Limited | | Petronet VK Limited |
| Raunaq International Limited |  | Reliance Industries Limited |
 | Reliance Petroleum Limited |  | Subhash Project & Marketing Limited |
| SHELL Hazira LNG Pvt. Ltd. |  | Ramky Infrastructure Ltd. |
 | Gannon Dunkerley & Co.Ltd. |  | Delhi Jal Board |
 | Gujarat Water Supply And Sewerage Board |  | Maharashtra Jeevan Pradhikaran |
 | Public Health Engineering Department, Rajasthan |  | Kirloskar Brothers Limited |
 | Larsen & Toubro | | Uttar Pradesh Jal Nigam, Lucknow |
| Directorate Of Supplies & Disposal, Haryana | | UttaranchalPey Jal Nigam, Dehradun |
| Madhya Pradesh Laghu Udyog Nigam Limited | | Public Health Engineering Department, Bihar |
| Drinking Water Supply And Sewerage Board, Ranchi. | | Punjab Water Supply & Sewerage Board |
| Karnataka Urban Water Supply & Sewerage Board, Bangalore. |