- AGIP
- Alyeska Pipeline Company
- Amoco
- Aramco
- Arco
- Bitor
- British National Oil Corporation
- British Petroleum
- Brown & Root
- Chevron
- Coastal
- Commonwealth Edison
- Conoco (UK) Ltd
- Constructors John Brown
- Delmarva Power & Light
- El Paso LNG
- Enserch Exploration Inc.
- Exxon
- Fish Engineering
- Florida Power & Light
- Gulf Oil-Cabinda
- Houston Power & Light
- Hunt Oil
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- Intevep
- Japex
- KBR
- Kerr-McGee
- Lagoven
- Libyan National Oil Company
- Lummus-Crest
- Marathon
- Maraven
- Mesa Petroleum
- McDermott
- Mobil Oil Canada
- Murphy E&P
- Northwest Energy
- PDVSA
- P&O Energy
- Pemex
- Pennsylvania Power & Light
- Pera Engineering
- Shell
- Texaco
- Union Texas
- Zapata Offshore
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