- ARL Refinery, Ltd.
- Barclays Capital
- BASF Corporation
- Becht Engineering
- BP Oil International, Ltd.
- Cairn Energy Corporation
- California Energy Commision
- Chevron Corporation
- Citgo Petroleum Corporation
- Coffeyville Resources LLC
- ConocoPhillips
- EnCana Corporation
- Essar Oil, Ltd.
- ExxonMobil
- Flint Hills Resources, LP
- Fluor Corporation
- Foster Wheeler
- Frontier Oil Corporation
- GE Global Research
- Hadramout Refineries Co., Ltd.
- Haverly Systems, Inc.
- Hess Corporation
- Hindustan Petroleum Corp. Ltd.
- Irving Oil Ltd.
- Intertek Caleb Brett
- JGC Corporation
- Kuwait Petroleum International, Ltd.
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- Lion Oil Company
- Marathon Ashland Petroleum, LLC
- Northrop Grumman
- Occidental Petroleum Corporation
- Petroleos de Venezuela S.A. (PDVSA)
- Petronas
- PetroSummit
- PFC Energy
- Poten & Partners Ltd.
- Purvin & Gertz, Inc.
- Queensland Energy Resources, Ltd.
- Reliance Petroleum, Ltd.
- SGS Group
- Shell Global Solutions
- Sinopec Corp.
- Sonangol
- Star Petroleum Refining Company
- Statoil
- Sumitomo Corporation
- Suncor Energy
- Sunoco, Inc.
- Symyx Technologies Inc.
- Tesoro Corporation
- Total S.A.
- US Department of Energy
- Valero Energy Corporation
- Vietnam Oil & Gas Corporation (PetroVietnam)
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