- A.E.C. Express, Ltd.
- All American Pipe Line Co.
- Alon USA
- Amoco Pipe Line Co.
- Arco Pipe Line Co.
- Bearpaw Energy
- BlackHills Operating
- BP Amoco
- BP Asphalt
- Centurion Pipe Line Co.
- Chevron Pipe Line Co.
- Chevron/Texaco
- Citgo Pipe Line Co.
- Clark Pipe Line Co.
- Conoco
- ConocoPhillips
- Continental Carbon
- Delek Pipe Line Co.
- Diamond Shamrock
- Duke Energy
- Dynegy Midstream
- E.O.T.T.
- Eastex Crude
- Enbridge Pipe Line Co.
- Encana Pipe Line Co.
- Enterprise Engineering
- Equilon Pipe Line Co.
- Explorer Pipe Line Co.
- Exxon Pipe Line Co
- ExxonMobil
- Farmland
- Fina Oil & Chemical
- Flint Hills Resources
- Frontier Terminals
- Genesis Crude
- Holly Energy
- I. T. Corp.
- Jayhawk Pipe Line Co.
- Kaston Pipe Line Co.
- Kerr McGee
- Kinder Morgan
- Koch Industries
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- Koch Petroleum Group
- Koch Pipe Line Co.
- Magellan Midstream
- Marathon
- Marathon Pipe Line Co.
- McMurrey Pipe Line Co.
- Michell Energy
- Mid-Valley Pipe Line Co.
- Mobil
- Mobil Pipe Line Co.
- Motiva Enterprises
- Navajo Pipe Line Co.
- Oxy
- Phillips Pipe Line Co.
- Plains Pipe Line Co.
- Platte Pipe Line Co.
- Pride
- Pride/Texaco
- Pure Resources
- Reiss Remediation
- SemCrude Pipe Line Co.
- Shell Pipe Line Co.
- Shell Western E & P
- Spirit Energy 76
- Star Enterprises
- STG
- Sun Pipe Line Co.
- Sunoco
- TBI Pipe Line Co.
- Teppco Pipe Line Co.
- Terasen Pipe Line Co.
- Texaco Pipe Line Co.
- Texas New Mexico P.L.
- Torch
- Total
- U.S. Navy/DuraTherm,Inc.
- Unocal Pipe Line
- Valero Pipeline
- West Texas Gulf Pipeline
- West-Tex 66
- Wyoming Pipeline
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