- Air Liquide Helium America, Inc.
- Alliance Resource Partners
- Amerada Hess
- Apache Corporation
- Atlas Pipeline Partners, LP
- Aventine Renewable Energy
- BASF/FINA
- Cantera Resources
- Carrera Gas Co.
- Cawley, Gillespie & Associates, Inc.
- Ceritas Energy, LLC
- Clough Engineering Ltd.
- ConocoPhillips
- Continental Gas, Inc.
- Copano Energy, L.L.C.
- Crosstex Energy Services
- DeGolyer & MacNaughton
- Duke Energy Field Services, L.P.
- Eagle Rock Energy, Inc.
- Energy Production Company
- ESSO Australia Resources Ltd.
- EXCO Resources, Inc.
- ExxonMobil Pipeline Co.
- F. Howard Walsh, Jr.
- Farmland Industries, Inc.
- Flying J, Inc.
- Genesis Energy, L.P.
- Gulf Atlantic Operations, LLC
- Gulf Liquids Development, L.L.C.
- Hiland Partners, L.L.C.
- Hunt Oil Company
- Huntsman Corporation
- Hyperion Resources, Inc.
- Inergy, L.P.
- Inter Pipeline
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- Louis Dreyfus Energy Services
- Maple Gas del Peru
- MarkWest Hydrocarbon, Inc.
- Marubeni Corporation
- Millennium Midstream Energy
- Murphy Oil Corporation
- Mustang Fuel Corporation
- OneOk Field Services
- Origin Energy Resources Ltd.
- Petro Source Partners, Ltd.
- PetroLogistics Partners, L.P.
- Placid Refining Co.
- Praxair, Inc.
- Prism Gas Systems, LP
- ProLiance Energy
- R. Lacy Inc.
- Range Resources Corporation
- Regency Gas Services
- Rosewood Resources
- SemGroup
- Sid Richardson Carbon & Gasoline Company
- Southern California Edison Co.
- Spectrum Field Services
- Sunoco, Inc. (R&M)
- Targa Resources, Inc.
- Tenaska Inc.
- Texas Petrochemicals, LP
- Transcontinental Gas Pipe Line Corporation
- Valero Energy Corporation
- Vintage Petroleum, Inc.
- West Texas Gas
- Western Gas Resources, Inc.
- Willbros USA, Inc
- Williams Field Services
- Williams Olefins, LLC
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