- Air Products Inc.
- ARCO Chemicals Co.
- Ausimont USA Inc.
- Bayer, Inc.
- Brown & Root Inc.
- Catalyst Resources Inc.
- C.E.-Randal Corp.
- CAMCO Corporation
- Chemic Engineers
- Chevron Phillips Inc.
- Chicago Bridge & Iron Corp.
- DCP Midstream Inc
- Dow Chemical USA
- Dresser Industries Inc.
- ELF Atochem North America Inc.
- Evalca, Inc.
- Exxon Chemical Co.
- Exxon Mobil USA
- Fluor-Daniel Engineering
- Fina Oil & Chemicals
- GATX Terminals
- GB - Biosciences Inc.
- Geon Corp.
- Georgia Gulf corp.
- General Petro-Chem Constructors
- Grace Chemical
- Gulf Bayport Chemical
- Haldor-Topsoe Chemicals
- Himont USA, Inc.
- Hoechst Celanese Chemicl
- ISP Chemcials
- ISK Chemicals
- Ingersoll-Rand Corp.
- Jacobs Engineering
- Liquide Air
- Lonza, Inc.
- Lube Power, Inc.
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- M.W. Kellogg Construction
- Marathon Oil Corp.
- Merichem Inc.
- Monsanto Chemicals
- Mobil Chemicals Company
- Morrison-Knudsen
- Morton-Thiokol, Inc.
- Occidental Chemicals
- OG&E Inc
- Pasadena Refining Inc.
- Pennwalt Company
- PPG Industries
- Parsons Worley Group
- Petrolite/Petreco
- Quantum Chemicals
- Rust Engineering
- Rhone-Poulenc
- Rohm & Haas
- Shell Oil company
- Sterling Chemicals
- Stubbs Overbeck & Associates
- S & B Engineers
- Solvay Polymer
- Sea Lion Chemicals
- Targa Inc.
- Texas Eastern Inc.
- Texas Petro-Chemicals Inc.
- Union Carbide Corp.
- Union Texas Petroleum
- Union Pump Corp.
- United Centrifugal Pumps
- Valero Refining Co.
- Williams, Inc.
- Witco, Inc.
- Wood Group, Inc
- Zeneca Ag Products
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