The list below includes some of our past and present clients.
| ABB Power Generation | AIOC |
| Aker Kvaerner | Aker Solutions |
| Amec | Amerada Hess |
| Amoco | Apache North Sea |
| Aramco (Saudi Arabia) | BADR Petroleum Company (Egypt) |
| BASF | BNFL |
| BP | BRV |
| Balfour Beatty | Bechtel |
| Brown & Root | Centrica Storage |
| Conoco | Costain |
| Daewoo Shipbuilding | Daniel Europe |
| Dong Energy | Doosan |
| Dubai Aluminium | ENPPI/GASCO |
| Elf Enterprises | Emirates Aluminium |
| EnCana | Entrepose |
| European Gas Turbines | Exterran |
| Exxon | FMC |
| Fluor Daniel | Foster Wheeler |
| GE Energy Products Europe | GEC Alsthom |
| Halliburton | Hyundai Engineering and Construction |
| Hyundai Heavy Industries | IMS |
| Intergen | John Brown Engineering |
| Kvaerner Construction | Kvaerner Energy |
| Lagoven (Venezuela) | Lembaga Lectric Sabah (Malaysia) |
| M F Kent (Kentz) | Maersk |
| Mafi Trench | Marubeni Corporation |
| Mobil | Murco Petroleum |
| NAM | National Power |
| Nexen Petroleum | Norsk Hydro |
| ONGC (India) | Occidental |
| PCNL | PDO (Oman) |
| Parsons Power Generation Systems | Phillips Petroleum |
| Powergen | Production Services Network |
| RWE Npower | Rolls Royce |
| SLP Engineering | Scottish Hydro Electric |
| Shell Expro | Siemens |
| Snamprogetti | Southern Electric |
| Statoil | Stephen Gillespie Consultants |
| Stone & Webster | Swinton Technology |
| Tailsman | Technip |
| Terra Nova Alliance | Thomassen |
| Total | Transco |
| Unocal | Wood Group |
| WorleyParsons |
OGS have designed and supplied packaged plants to many major petrochemical companies worldwide.
Previous clients and end-users include those listed here.
