Aera - Lost Hills Gas Plant
AES Deepwater, Inc.
Algonquin Gas
Alliance Engineering
Amoco Corporation
ANR Pipeline Company
Arco Chemical Company
Aristech Chemical Corporation
Aspen Energy
Atofina
Basis Petroleum, Inc.
Bayer Corporation
BETA Machinery Analysis, Inc.
Bluewater Constructors
BMH Eagleton Inc.
BP
BP Amoco
BP Pipelines
Cedar Bayou Power Plant
Celanese
CenterPoint Energy
Chevron
Chevron Chemical Company
Chevron Pipeline Company
Chevron Texaco
Chevron U.S.A.
Chevron U.S.A. Production Company
Chocolate Bayou Works
Citgo Products Pipeline Co.
City of Houston
City of Houston Public Works
Clean Air Action Corporation
Cleveland Manufacturing
CMS Energy
Coastal
Coastal States Crude Gathering Company
Colonial Pipeline Company
Colorado Interstate Gas
Colorado Interstate Gas
Columbia Gas Transmission
Conoco, Inc.
Conoco-Phillips
Coral Energy
Crown
Crude Gathering Company
Dakota County Technical College
Diamond Shamrock
Diamond-Koch
Dominion Transmission
Dow Chemical Company
Dow Pipeline Company
Duke Energy
Dupont
DuPont Packaging & Industrial Polymers
Dynegy
Dynegy Midstream Services, L.P.
Eagleton Engineering Company
East Ohio Gas Company
El Paso - SNG
El Paso Corporation
El Paso Natural Gas
Enogex
Enogex, An OGE Energy Company
Enron
Enron / Transwestern Pipeline
Enron Gas Pipeline Group
Enron Gas Pipelines
Enron Transportation Services
Entergy
Enterprise
Equilon Enterprises
Equitable Gas
eWebOQ - Overnight Software
Exxon
Exxon Company USA
Exxon Pipeline Company
ExxonMobil
Fina Oil and Chemical Company
Flint Hills Resources
Florida Gas Transmission Company
GATX Terminals Corporation
Georgia Gulf Chemicals & Vinyls
Groth
Gulf Coast Water Authority
Gulf South Pipeline, LLC
Huntsman
IDS Engineering, Inc.
ISC Instrumentation & Electrical

Jacobs Engineering Group, Inc.
Kellogg, Brown, & Root, Inc.
Kinder Morgan
KN Energy
Koch Gateway Pipeline, Co.
LCRA
Lyondell
Lyondell-Citgo
Marathon
Marathon Refinery
Nicor
NICOR
Nicor Gas
Noram-Reliant-Arkla
Norco Chemical Plant
Oasis Pipeline
OFM Supply, Inc.
Oil Tanking Houston
Oncor
Oncor Pipeline Group
ONEOK
Oneok Gas Transportation
Optimized Process Designs, Inc.
P.E.
Pacific Gas & Electric Company
Paktank Corporation
Panhandle Eastern Pipe Line Company
Paragon
Pek-Tech Industries
Philadelphia Gas Works
Phillips 66
Phillips Petroleum Co.
Phillips Pipeline
Piedmont Natural Gas
Premcor Refinery Group
PriceWaterhouseCoopers
Questar
Reliant Energy
REM Technology
Schlumberger
SDGE
Seagull Energy Corporation
Seminole Pipeline Co.
Shell
Shell Chemical
Shell Deer Park Refining Company
Shell Oil Products
Shell Pipeline Corporation
Shells Services International
Southern California Gas Company
Southern LNG
Southern Union Company
Spartan Controls
Sun Pipeline Company
Sunbelt Supply Company
Sunoco Logistics
Superior Energies, Inc.
Technisys Inc.
TECO Peoples Gas
Tejas Gas Corporation
Tenneco Energy
Tennesse Gas Pipeline
Teppco
Tepsco
Texas Gas Transmission
The Gas Company
The Petroleum Institute for Continuing Education (PEICE)
TI Energy Services, Inc.
TI Energy Services, Inc.
TXU Pipeline Services
U.S. Department of Energy
UDS Corporation
Ultramar Diamond Shamrock
Universal ENSCO, Inc.
US Pipeline
Valero Refining Company
Vastar Resources
Washington Gas
Washington Gas Company
Welker
Welker Engineering
Williams
Williams Gas Pipeline
Williston Basin Pipeline Company
Xcel Energy - Viking Gas Transmission