Aban Constructions LimitedAssam Gas Co. Limited
Bharat Petroleum Corporation LimitedBharat Petroleum Corporation LimitedBridge & Roof Co. (India) Ltd.Bridge & Roof Co. (India) Ltd.
Cairn EnergyCairn EnergyEngineers India Limited
Essar Constructions LimitedGAIL (India) LimitedGAIL (India) Limited
Gujarat Gas Co. LimitedHindustan PetroleumHindustan Petroleum Corporation Limited
IBP LimitedIndian Oil Tanking Limited
Indian Oil CorporationIVRCLIVRCL Infrastructure & Projects Limited
Oil and Natural Gas Corporation LimitedOil and Natural Gas Corporation LimitedPetronet India Limited
Petronet MHB LimitedPetronet VK Limited
Raunaq International LimitedReliance Industries LimitedReliance Industries Limited
Reliance Petroleum LimitedReliance Petroleum LimitedSubhash Project & Marketing LimitedSubhash Project & Marketing Limited
SHELL Hazira LNG Pvt. Ltd.Ramky Infrastructure Ltd.Ramky Infrastructure Ltd.
Gannon Dunkerley & Co.Ltd.Gannon Dunkerley & Co.Ltd.Delhi Jal BoardDelhi Jal Board
Gujarat Water Supply And Sewerage BoardGujarat Water Supply And Sewerage BoardMaharashtra Jeevan PradhikaranMaharashtra Jeevan Pradhikaran
Public Health Engineering Department, RajasthanPublic Health Engineering Department, RajasthanKirloskar Brothers LimitedKirloskar Brothers Limited
Larsen & ToubroLarsen & ToubroUttar Pradesh Jal Nigam, Lucknow
Directorate Of Supplies & Disposal, HaryanaUttaranchalPey Jal Nigam, Dehradun
Madhya Pradesh Laghu Udyog Nigam LimitedPublic Health Engineering Department, Bihar
Drinking Water Supply And Sewerage Board, Ranchi.Punjab Water Supply & Sewerage Board
Karnataka Urban Water Supply & Sewerage Board, Bangalore.