• Alliance Engineering
  • Audubon Engineering
  • BCCK Engineering, Inc.
  • Burns & McDonnell
  • EMD
  • Freese & Nicol Associates
  • Gulf Interstate Engineering
  • Honeywell
  • HPF Consultants
  • Kahuna Ventures
  • Linde BOC
  • Matrix POM Engineering
  • Meers Engineering
  • Mustang Engineering
  • Nicholas Consulting Group Inc.
  • PCES
  • Ref-Chem Corporation
  • River Consulting
  • Siemens Westinghouse
  • (TKS) Tesenderlo Kerly Service
  • Thomas Russell Company
  • Turn-Key Specialists, Inc.
  • UOP
  • Washington Group
  • Willbros, Inc.
  • Air Products
  • Municipal Water Supply
  • Parks and Wildlife
  • Gypsum Manufacturing
  • Wind energy
  • Epic Construction
  • Crowe Group
  • Pace/Amtex
  • Collier Construction
  • Harris Acoustics
  • CR Crawford Construction
  • Lee Lewis Construction
  • Turner Construction
  • Sadalco Construction
  • WB Kibler Construction
  • Hoar Construction
  • Bryan Parks & Associates
  • Parkhill Smith & Cooper
  • Tittle Luther Partnership
  • Williams Tippet & Associates
  • Bowden Construction
  • Bluewater Construction
  • CCI
  • G-Force
  • ISTI Plant Services
  • J. Irwin
  • MidAmerican
  • Midway
  • Ranger Plant Construction
  • Ref-Chem
  • Sunland Construction
  • WHC
  • Atlas Pipeline
  • Boardwalk
  • Blue Racer
  • Brazos Midstream
  • Bobcat Storage
  • Bonanza Creek
  • Cardinal Midstream
  • Centerpoint
  • Centurion
  • Chenier
  • Columbia Pipeline
  • Conoco Phillips
  • Chevron, Inc
  • Crestwood Midstream
  • CrossTex
  • DCP Midstream
  • Devon
  • Duke Energy
  • El Paso & Affiliates
  • Enbridge Energy
  • Energy Transfer
  • Enlink Midstream
  • Enogex
  • Enstor Inc
  • Enterprise
  • EOG Resources
  • Explorer Pipeline
  • Exxon / Mobil
  • Gulf South
  • Harvest Pipeline
  • HESS
  • Holly Energy Partners
  • Kinder Morgan Inc.
  • LDH Energy Resources
  • Magellan Pipeline Company
  • Marathon Oil
  • MarkWest
  • Matrix Services
  • NiSource / Columbia Gas
  • Nortex Midstream
  • Northern Natural Gas Company
  • ONEOK
  • OXY USA, Inc.
  • P-66
  • Pecan Pipeline
  • Penntex Midstream
  • Petal Gas Storage
  • Pioneer Natural Resources
  • Plains All American
  • Quicksilver Resources
  • Regency Gas
  • Southcross Energy
  • Southern Natural Gas Company
  • Spectra Energy
  • Sunoco Logistics
  • Summit Midstream
  • Superior Pipeline
  • Sun Oil
  • Talisman Energy
  • Targa Resources
  • Teppco & Affiliates
  • Tennessee Gas
  • Wildcat Midstream
  • Williams & Affiliates
  • XTO Energy