Anvil Corporation
Bantrel Inc.
Bechtel Corporation
Black & Veatch Pritchard, Inc.
Burns & McDonnell
C & I Engineering
CEntry Constructors & Engineers
Colt Engineering
Fluor Daniel, Inc.
Ford, Bacon & Davis
Foster Wheeler Corporation
Jacobs Engineering Group, Inc.
 

Kellogg Brown & Root
Kvaerner Process
Mustang Engineering, Inc
Parsons Process Group
Process Services, Inc.
S & B Engineers & Constructors, Ltd.
Shaw, Stone & Webster Engineering
Technip USA Corp
Unifield
Veco Engineering, Inc.
Williams Brothers Engineering Ltd.
 

Agrium
Air Products & Chemicals, Inc.
Albemarle Corporation
American Refining
Arco Chemical Company
Aristech Chemicals
BP Amoco
Calumet Lubricants Company L.P.
Chevron Texaco
Citgo Refining & Chemicals Company, L.P.
Coastal Aruba Refining Company
Coffeyville Resources Refining & Marketing, LLC
ConocoPhillips
Cooperative Refining
Countrymark CO-OP Refinery
Dow Chemical Company
Eastman Company
Enterprise
Equilon Enterprises LLC
Ergon West Virginia, Inc.
Flint Hills Resources L.P.
Formosa Plastics Corporation
Hess
Hovensa
Hunt Refining
 

Irving Oil
Koch Nitrogen
Marathon Petroleum, LLC
Mobil Oil Corporation
Montana Refining
Motiva
Murphy Oil
NCRA
Occidental Chemical Company
Oneok
Oxy
Premcor
Puget Sound Refining
Shell Chemical Company
Shell Oil Company
Shell Western E & P, Inc.
Sinclair
Star Enterprise
Sunoco Company, Inc.
Tesoro
Tosco Corporation
U.S. Oil
Valero
Yara Trinidad