- AT&T Communications
- Kinder Morgan Pipeline
- KN Energy
- Texas Department of Transportation
- City of Olathe, KS
- City of Austin, TX
- Level 3 Communications
- Williams Communications
- Sprint Communications
- Louisville Water Company
- Williams Natural Gas Company
- Tampa Bay Engineering
- Northern Borders Pipeline Company
- ONCOR (TXU) Gas Company
- Public Services Company of N.C.
- Dallas/Ft. Worth International Airport
- Dayton Power & Light Company
- TXU Pipeline Company
- Pan Handle Eastern Pipeline Company
- Koch Pipeline Inc.
- Williams Field Service
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- El Paso Field Service
- Questar Pipeline Company
- Shell Pipe Line Company
- Phillips 66 Company
- Exxon Pipeline Company
- Chevron Pipeline Company
- Total Petroleum Inc.
- Conoco Pipeline Company
- Platte Pipeline
- ConocoPhillips
- Colonial Pipeline Company
- BP Pipeline Company
- Ashland Pipe Line Company
- Glacier Pipeline Company
- Rocky Mountain Pipeline Company
- Duke Energy
- City of Lee's Summit, MO
- City of Lenexa, KS
- HNTB Engineering
- Phillips Petroleum
- Gulf South Pipeline Company
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