- 3M
- ABB Lumas
- Alliance Engineering
- Allied Chemical
- Amerado Hess
- Aminoil USA
- Amoco
- Anadarko Production
- ANR Pipeline
- Apache Oil & Gas
- Apex
- Arco Oil & Gas
- Astoria Oil Services
- Atlantic Gas & Light
- Avondale Shipyard
- BASF Wyandotte
- Bay, Inc.
- Bay Gas
- Bayou Steel
- Bechtel
- Bel North Petroleum
- B.F. Goodrich
- Boardwalk Pipeline
- Boeing Petroleum
- Boh Brothers
- Borden Chemical
- British Petroleum
- Brown & Root
- Bunge Grain
- CBS Engineering
- C.E. Natco
- C.N.G. Production
- Callon Petroleum
- Cargil Salt
- Celeron
- Centerpoint Energy
- Champion Paper
- Champion Petroleum
- Citgo
- Casco Oil Company
- Chart Energy & Chemicals
- Chevron Pipeline
- Chevron USA
- Cities Service
- Claiborne Gas
- Columbia Gas Transmission
- Conoco
- Conoco Pipeline
- Conoco Production
- Conquest Petroleum
- Consafe
- Davis Oil
- Diamond Shamrock
- Dow Chemical
- Dual Drilling
- Dupont Chemical
- ECI Engineers
- El Paso
- Exxon USA
- Exxon Pipeline
- Exxon Plastics
- Felmont Oil
- Florida Gas Transmission
- Freeport McMoran
- Geosource
- Getty Oil
- Global Marine Drilling
- Goodyear
- Gulf Oil Exploration & Production
- Gulf South Pipeline
- Helmerich & Payne
- Houma Industries
- Houston Oil & Mineral
- Hunt Oil
- Inter-North Petroleum
- KCI Constructors
- Kerr McGee
- Kinder Morgan
- LL & E
- Lockwood Greene
- LP & L
- Linder & Associates
- Marathon Oil
- McDermott, Inc.
- Mesa Petroleum
- Mobil Oil
- Mobil Pipeline
- Modulaire
- Monsanto Company
- Morrison Knutsen
- Morton Chemical
- Nalco Chemical
- Nerco Oil
- NOPSI
- Northwestern Steel
- Occidental Petroleum
- ODECO
- PPG Chemical
- Pan Handle East Pipeline
- Pennzoil
- Phillips Petroleum
- Placid Oil
- Plains Marketing
- Powell Elec. Mfg.
- Quintana Petroleum
- Riverside Pipeline
- Samedan Oil
- Seagull Energy
- Seneca Resources
- Shell Oil Co.
- Shell Pipeline Co.
- Simpson Paper
- SIP Engineering
- Slemco
- Sohio
- Solar Turbines
- Sonat
- Southern Natural Gas
- Southern Union Gas
- Spectra Gas
- Sun Oil Company
- Sylvia Chemicals
- Tenneco Oil Company
- Tenneco Pipeline
- Tenneco Refining
- Texaco
- Texas Gas Pipeline
- Texoma Production Co.
- Triad Chemical
- Transco
- Trunkline Gas Pipeline
- Unifab, Inc.
- Union Oil of California
- US Army Corps of eng.
- Waldermar S. Nelson
- Walk Haydel
- Warren Petroleum
- Williams Pipeline