- American Acryl
- Atofina
- Austin Industrial
- BASF
- BE&K
- Bayer Chemical
- Bomac General Contractors
- CB&I Beaumont
- Chevron Chemical
- Citgo Refining Corporation
- Daniels Construction
- Englobal Engineering
- Exxon/Mobil
- Shell Deer Park
- WillBros Engineers
- Ryckman Creek
- Frontier Refining
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- Goodyear Tire & Rubber
- Huntsman Chemical
- ISP Elastomers
- Infinity Construction
- Jacobs Engineering
- KBR
- KTI
- Linde Corporation
- Mason Construction
- Motiva Enterprises
- Mustang Engineering
- ReCon Engineering
- Richard Construction, Inc.
- Technip USA
- Sigma Engineers
- Petro Chem
- Western Refining
- Valero Refining
- Tanga
- Kinder Morgan
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