Process Consulting Services has undertaken projects for clients in the US, Canada, Latin America, Europe, India, China, the Middle East, South Africa and Australia.

• Alon USA
• BP
• Calcasieu Refining Company
• Caltex Refineries (NSW) Pty Ltd.
• Calumet Lubricants Company
• ChevronTexaco Corporation
• CITGO Petroleum Corporation
• CITGO Asphalt Refining Company
• ConocoPhillips
• Consumers’ Cooperative Refineries, Ltd.
• Essar Oil Limited 
• Flint Hill Resources, LP
• Flying J Inc.
• Frontier Oil Corporation
• GIANT Industries, Inc.
• HollyFrontier Corporation
• Houston Refining LP
• Irving Oil Limited 
• Lyondell-CITGO Refining, LP 

• Marathon Petroleum Corporation
• Motiva Enterprises LLC 
• National Petroleum Refiners of South Africa Ltd. (NATREF)
• Navajo Refining Company, LP
• North Atlantic Refining Limited
• North West Upgrading Inc.
• NuStar Energy, LP 
• Pasadena Refining System, Inc.
• Petrobras 
• Petróleos de Venezuela SA (PdVSA)
• Petro-Canada
• PetroChina
• Reliance Industries Limited
• Rosneft 
• Shell Oil Products
• Sinclair Oil Corporation 
• Suncor Energy
• TOTAL
• Valero Energy Corporation