Some of IPI’s prestigious clientele/projects all over the Philippines include water industries such as Metropolitan Waterworks & Sewerage System (MWSS) – Manila Water Co., Inc. & Maynilad Water Services Inc., Local Water Utilities Administration; gas and oil industry such as Pilipinas Shell Petroleum Corporation, Petron Corporation, Caltex (Phils.), Inc., Total Petroleum Corporation, Flying V; as well as port operators like the International Container Terminal Services, Inc., and Philippine Ports Authority. San Miguel Corp., Hanjin Heavy Industries & Const. Co. Ltd., SMCC Philippines Corp., J.V. Angeles Construction Corp., J.E. Manalo & Co., Inc., Leighton Contractors Corp., Frey-fil Corporation, Sta. Clara International Corp., Aboitiz Construction Group Inc., HEDCOR Inc., just to name a few.