STSI performs works on construction and reconstruction 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 following construction or reconstruction projects:

• Refinery plants
  • Reconstruction of hydrant network system at Rijeka Refinery
  • Construction of a water barier container 320-V-002 and vessel reconstruction 320-V-051 at Rijeka Refinery (Flare Gas Recovery System)
  • Revitalization of the extinguishing and cooling system of the D Group of tanks at Rijeka Refinery
  • Construction of a system for monitoring the consumption of energy media at Rijeka Refinery
  • Construction of a system for enhancing energy efficiency of the atmospheric distillation plant at Rijeka Refinery
  • Construction of a system for optimization of hydrogen consumption and production at Rijeka Refinery
  • Tank 333-SC-019 Reconstruction at Rijeka Refinery
  • Tank 333-SC-018 Reconstruction at Rijeka Refinery
  • Construction of hydrocracking interconnecting pipelines at Rijeka Refinery
  • Construction of solar power plants at the SPP (Solar Power Plant) Virje and SPP Sisak sites
  • Reconstruction of the tank wagon depot at Sisak Refinery
  • Construction of the PSA 2 plant at Sisak Refinery
  • Construction of the Clus plant at Sisak Refinery
  • Construction of the biofuel system at Sisak Refinery
  • Construction of the PENEX low-temperature isomerization plant
  • 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 INA fields
  • Međimurje project – connecting gas pipeline and facilities of the Vučkovec field
  • Construction of gas processing plant at MDS (Metering and Dispatch Station) Đeletovci
  • Construction of compressor station at the CGS (Central Gas Station) Molve
  • Revitalization of existing pipelines by inserting composite pipes
  • Reconstruction of the main pipeline Sisak – Virje – Gola
  • 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 CO2 injection system
  • Palmyra Project – construction of a well gathering system, gas station, 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)

• LNG Terminal, Omišalj, Croatia
  • Construction of jetty, auxiliary facilities and plant for the LNG Terminal Omišalj, Krk

• Gas pipelines
  • Pula – Karlovac gas pipeline

• Offshore plants
  • Construction of the supporting structure (jacket) of Ivana K platform
  • Modification of Ika A, Ida C, Ivana K, Ivana E and Katarina platforms

Design

STSI d.o.o. provides design services focused on the design of new and reconstruction of existing plants in the oil and gas industry:

• design of tanks and pipelines
• equipment design
• design of all types of steel and concrete structures
• design of electrical and instrumentation systems

Highlighted projects

• Preparation of design documentation for the reconstruction of spherical tank 336-SE-023 and interconnecting pipelines at RR
• Preparation of design documentation for manufacture of hydraulic pipe lifter
• Preparation of design documentation for the reconstruction of cylindrical tanks with a capacity of up a 80,000 m3
• Preparation of design documentation for the project of installing a portable compressor unit at the GS (Gas Station) Gola Duboka in the hydrocarbon exploitation field
• Preparation of design documentation for the repair of concrete structures of the sump area (bunding) for the tank 331-SA-018/019/020 at RR (Rijeka Refinery)