STSI performs construction of facilities and plants in the Republic of Croatia and abroad.
In the Republic of Croatia, STSI has, independently or as a consortium partner, taken part in the construction of:
- Gas pipeline
- Pula – Karlovac gas pipeline
- Refinery plants
- Construction of the PSA 2 plant at SR (Sisak Refinery)
- Construction of the Claus plant at SR
- Construction of hydrocracking interconnecting pipelines at RR (Rijeka Refinery)
- Construction of compressor stations
- Construction of the biofuel system at SR
- Construction of the PENEX low-temperature isomerization plant
- engineering, procurement, construction supervision and commissioning (EPS)
- Reconstruction of the plant for hydrodesulfurization of petrol and diesel fuel L/LCh – engineering, procurement, construction supervision and commissioning (EPS)
- Construction of the CLAUS plant for the production of the elemental sulfur, phase I – engineering, procurement, construction supervision and commissioning (EPS)
- Construction of the CLAUS plant for the production of elemental sulphur, phase II – engineering, procurement, construction supervision and commissioning (EPS)
- Oil and gas exploitation plants
- Construction of well sites at all INA fields
- Revitalization of existing pipelines by inserting composite pipes
- Reconstruction of the aMDEA system at the CGS (Central Gas Station) Molve 3
- Installation of cogeneration turbine blocks TEA 3 and TEA 4 at CGS Molve
- EOR (enhanced oil recovery) project – construction of a CO2 injection system
- Međimurje project – connecting gas pipeline and facilities of the Vučkovec field
- Palmyra project – construction of a well gathering system, gas station and gas pipeline – engineering, procurement and construction supervision
- Jazal project – construction of a well site and gas pipeline – engineering, procurement and construction (EPC)
- Jihar project Stage 2 – Construction of a well gathering system, gas treatment plant with a compressor station – engineering, procurement and construction (EPC)
- Offshore plants
- Construction of the supporting structure (jacket) of Ivana K platform
- Modification of Ika A, Ida C, Ivana K and Katarina platforms