- American Acryl
- Atofina
- Austin Industrial
- BASF
- BE&K
- Bayer Chemical
- Bomac General Contractors
- CB&I Beaumont
- Chevron Chemical
- Citgo Refining Corporation
- Conex
- Daniels Construction
- Englobal Engineering
- Exxon/Mobil
- Foster Wheeler
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- Goodyear Tire & Rubber
- Huntsman Chemical
- ISP Elastomers
- Infinity Construction
- International Maintenance
- Jacobs Engineering
- KBR
- KTI
- Linde Corporation
- Mason Construction
- Motiva Enterprises
- Mustang Engineering
- ReCon Engineering
- Richard Construction, Inc.
- Technip USA
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