- Agip
- BP
- British Gas
- Burullus Gas
- Chevron
- Conoco
- ELF
- Exxon
- Gas de France
- Gasprom
- Mærsk Oil
- Norsk-Hydro
- ÖMV
- Pemex
- Perenco
- Petro Canada
- Petro SA
- Petrobras
- Romgas
- RWE DEA
- Shell
- Statoil
- Texaco, Caltex
- Total
- Turkmenneft
- Wintershall
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- Frames
- Halliburton
- Kværner Oil & Gas
- Peroni
- Positive Metering Systems
- SMS
- Tractebel
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- ABB
- AKER Maritime
- AMEC
- Engineering
- Bechtel
- FLUOR
- Foster Wheeler
- KBR
- Kværner Oil & Gas
- Linde
- Lurgi
- Snamprogetti
- SNC
- Uhde
- Tyco
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