Üstay started new works in İzmir, Aliağa and İzmit Refineries under The Call Off Contract Framework Agreement that was previously signed between Tüpraş and Üstay. This agreement is valid for 3 years and covers the detailed engineering, procurement, construction, assembly and commissioning works of various investment projects and programs including Tüpraş's İzmit, İzmir, Kırıkkale and Batman refineries and all other facilities

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