- AGL Resources
- Aker Kvaerner
- Alabama Gas Corporation
- Alqonquin Gas Transmission
- ANR Pipeline
- Apache Corp
- Bayou Bend Petroleum
- Bayou Companies
- BHP Billiton Petroleum
- BP America Production Co.
- Broadwater
- Carolina Gas Transmission
- Cheniere
- Chevron Corp
- Chevron Nigeria Ltd
- Chevron Pipeline Co.
- ChevronTexaco Global Technology
- Colonial Pipeline Company
- Conoco Phillips
- Crystal Energy
- Denbury
- Devon
- Discovery
- Discovery Producer Services
- Dixie Pipeline Company
- Dominion
- Duke Energy
- Dynegy Midstream Svcs.
- El Paso
- Enbridge Energy
- Energy Partners
- Energy Transfer
- Enterprise
- Enterprise Products
- ExxonMobil
- ExxonMobil Pipeline
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- Florida Gas
- Freeport McMoran
- Great Lakes Gas Transmission
- Gulf South
- Gulfstream Natural Gas System
- Halo Wind Energy
- Helis Oil
- Iroquois Pipeline Operating Company
- Islander East Pipeline Company, LLC
- KeySpan
- Kinder Morgan
- Lloyds Register
- Nippon
- Panhandle Energy
- Plains
- Quintana
- Sea Robin
- Shell
- Southern Natural Gas
- Spectra
- Standard Renewables
- Stone Energy
- Targa Resources
- Taylor Energy Co.
- Tenneco
- Tennessee Gas
- TEPPCO Partners, LP
- Texaco
- TGCS Energy Services
- Tidelands Oil and Gas
- TransCanada Pipelines
- Transco
- Trow Engineering
- W & T Offshore
- Williams
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