NORTH AMERICAN CLIENTS

• Alliance Pipeline Co.
• Alliant Energy
• Alaska Industrial Development & Export Authority
• Alyeska Pipeline Co.
• Aquila
• Anadarko Petroleum
• Atmos Energy
• Boardwalk LLP. (Owned by Lowes Group)
  • Texas Gas
  • Gulf South
• British Petroleum
  • Sohio
  • Standard Oil
  • Atlantic Richfield (Arco Alaska)
• Buckeye
• CenterPoint
  • Reliant Energy
  • Minnegasco
• Cheniere
• Cinergy
• CNG
• Colonial Pipeline Co.
• Colombia Gulf Transmission
• ConocoPhillips
  • Conoco
  • Phillips
• Consumers Energy
• Denbury Resources
• Dominion
• Dynergy
• El Paso Corporation
  • Southern Natural Gas (SONAT)
  • Tennessee Gas Pipeline (Tenaco)
  • Colorado Interstate Gas
  • Wyoming Interstate Gas
  • Portland Natural Gas
  • Destin Pipeline, LLC. (BP/Shell/SONAT)
  • ANR (now owned by TransCanada Pipeline Co.)
• Empire
• Enbridge
  • Lakehead Pipeline
  • Vector
  • IPL
• E N Energy
• Equitable (formerly, Dominion Gas)
• Energy Transfer
• Enterprise (Owned by MidAmerica Pipeline)
  • Formerly, MAPCO (formerly owned by Williams Company)
  • TEPPCO
• Express Pipeline Co.
• Exxon/Mobil
  • Golden Pass LNG
• Florida Gas (owned by El Paso & Southern Union)
• Golden Valley Electric Association
• Great Lakes Gas Transmission (owned by TCPL)
• Gulf South (owned by Boardwalk)
• Kinder Morgan
  • Rockies Express Pipeline
  • Natural Gas Pipeline
  • TransColorado Pipeline
• Koch Pipeline Co.
  • Minesota Pipeline Co.
• Kern River (Owned by MidAmerica Energy Holdings, LLC.)
• MidAmerica Holdings, LLC
  • Enterprise
  • Northern Natural Gas
  • Kern River
• National Fuel Gas
• NICOR
• NiSource
  • Columbia Gas Transmission
• Northern Border (a Northern Plains Natural Gas Co.)
  • Viking Gas
  • Guardian Pipeline (formerly owned by CMS)
• Northern Natural Gas (a MidAmerican Energy Holdings Company)
• NW Natural Gas
• ONEOK
• OSARK Gas (Formerly, Arkla Gas)
• Pacific Gas & Electric Co.
• Peoples Energy (now owned by Wisconsin Public Utilities)
• Piedmont Natural Gas
• Regency Gas Services
• Sempra Energy
• Southern Union Gas
  • CMS
  • Panhandle Energy
  • Trunkline Gas
  • TransWestern Pipeline
  • Florida Gas Transmission
  • TransUnion Interstate
• Spectra Energy (formerly, Duke Energy)
  • Texas Eastern
  • Cities Service
  • East Tennesse Natural Gas
  • Maritimes
• State of Alaska
• TEPPCO (owned by Enterprise)
• Texas Gas (owned by Boardwalk)
• TransCanada Pipelines
  • Great Lakes
  • Northern Border
  • ANR
• UNOCAL
• US Army Corp of Engineers
• Viking Gas (owned by Northern Border Partners, LLP)
• WE Energies Wisconsin Gas
• Williams
  • Transco
  • Buccanneer Gas Pipeline Co.
  • Northwest Pipeline Company
  • Williams Gas Pipeline
  • Cities Service Gas Co.
• Xcel Energy

ENGINEERING COMPANIES

• AMEC Paragon
• Bechtel
• Brown & Root
• EN Engineering
• Enerteq
• Fluor
  • Daniel Williams Brothers Engineering Co.
• Foster Wheeler
• Gas Transmission Systems, Inc.
• Gulf Interstate Engineering
• Holland Engineering
• LHB
• Mustang Engineering
• SPEC Services
• Trigon
• Universal Ensco
• Wilbros Engineers, Inc.
• Worley Parsons

INTERNATIONAL CLIENTS

• ARAMCO (Saudi Arabian Oil Company)
• National Iranian Oil Co. (pre 1979)
• Iraq National Oil Co. (pre 1978)
• Mannesmann Demag
• Lybia Oil Company (1960's)
• Occidental Oil Company, Lybia (1960's)
• Uzneftegastroy (Uzbekistan)