| 1. | Work of a service engineer at Sisak oil refinery, loan to Energo | 2014 |
| 2. | Work of authorized specialist in Sisak oil refinery, loan to Energo-Termoenergetika Sisak | 2014 |
| 3. | Procurement of John Zink pilot igniters, Rijeka Oil Refinery, 6 pcs. to STSI d.o.o. | 2016 |
| 4. | Testing of combustion & operation of floor and wall mounted John Zink burners with analysis of increased efficiency degree of gasoline F-1A/B & ethane F2A/B furnaces at Petrochemical plant, Petrohemija Pančevo, HIP | 2016 |
| 5. | Procurement of John Zink fuel gas manifold, Sisak oil Refinery, 24 pcs., STSI d.o.o. | 2016 |
| 6. | Procurement of John Zink PMS-3 burners with burner tiles, 30 pcs., Brod oil Refinery a.d., OPTIMA Group | 2016 |
| 7. | Procurement of John Zink gas tips for heater H-5101, 10 pcs and pilot mixers for heater H-5101, 10 pcs., Sisak oil Refinery, INA d.d. | 2016 |
| 8. | Procurement of flame detector rods, 12 pcs. Rijeka oil Refinery, INA d.d. | 2016 |
| 9. | Procurement of John Zink primary gas tips model CA-PAT-1743, 5 pcs., staged gas tips model CA-PAT-1634,5 pcs., pilot tip ST-1-SE assemblies 5 pcs, Rijeka oil Refinery., STSI d.o.o. | 2016 |
| 10. | Procurement of John Zink tips model CBS, 2 pcs. and pilot tip model SPECIAL DEEPSTAR, 1 pcs., Rijeka oil Refinery, STSI d.o.o. | 2016 |
| 11. | Design and procurament of equipment for electrostatic purifier (ESP), Rijeka oil Refinery, INA d.d. | 2016 |
| 12. | Procurement of John Zink PMS-3 burners with burner tiles, 30 pcs., Brod oil Refinery a.d., OPTIMA Group | 2017 |
| 13. | Study for reconstruction of Flare system, Pančevo oil Refinery, NIS a.d. | 2017 |
| 14. | Procurament of John Zink tips CBS, 6 pcs. and pilot tips SPECIAL DEEPSTAR-6R, 3 pcs., Rijeka oil Refinery, STSI d.o.o. | 2017 |
| .15. | Procurament of flame detector rods, 12 pcs., Rijeka oil Refinery, INA d.d. | 2017 |
| 16. | Inspection of the boiler, Belišće, DS Smith | 2017 |
| 17. | Procurement of HERO oil gun assembly (new design), 3 pcs., Pančevo oil Refinery, NIS a.d. | 2017 |
| 18. | Procurement of John Zink gas tips DB-6 for heater H-6101, 30 pcs., gas tips DB-6 for heater H-6301 20 pcs. and gas tips DA-6-5 for heater 301-H-3 30 pcs., Sisak oil Refinery, INA d.d. | 2017 |
| 19. | Procurement of pilot mixer assemblies for heaters 301-H-3 and HFC-6, 15 pcs., Sisak oil Refinery, STSI d.o.o. | 2017 |
| 20. | Study with analysis of existing burners and proposals of technical solutions for improvement and replacement of the existing burners in process heaters, Brod oil Refinery a.d., OPTIMA Group | 2017 |
| 21. | Procurement, examination, surveilance and commisioning of low NOx burner system for CO Boiler, Rijeka oil Refinery, INA d.d. | 2017/2018 |
| 22. | Burner replacement on heater BA-2201A/B (vacuum distillation unit), 52 pcs., Pančevo oil Refinery, NIS a.d. | 2017/2018 |
| 23. | CFD analysis of the CO Boiler 327-H-003, burners, complete combustion system and air duct system in FCC plant with the presence of the customer, Rijeka oil Refinery , INA d.d. | 2018 |
| 24. | Procurement of John Zink burners PVYD -14 for heaters BA 401, 3 pcs. And BA 402, 3 pcs., Pančevo oil Refinery, NIS a.d. | 2018 |
| 25. | Procurement of equipment and material, providing of the design and other services and execution of construction works on a "turnkey" basis - burner replacement on heaters BA-2101, 36 pcs. (atmosferic distillation unit) and BA-2301, 6 pcs. (FCC unit), Pančevo oil Refinery, NIS a.d. | 2018/2019 |
| 26. | CFD analysis with simulation of combustion and air distribution for heaters BA-2101 (atmospheric distillation unit) and BA-2301 (FCC unit) with presence of Customer, Pančevo oil Refinery, NIS a.d. | 2019 |
| 27. | Examination of steam boilers 1 and 2 with optimization proposal, Skopje, OKTA AD | 2018 |
| 28. | Procurement of equipment and material, providing of design and other services and execution of construction works on a "turnkey" basis - burner replacement on heaters BA-2401, 3 pcs. and BA-2402, 3. pcs. (HDS unit), Pančevo oil Refinery, NIS a.d. | 2018/2019 |
| 29. | Procurement of John Zink burners spare parts for the purposes of Rijeka oil Refinery, INA d.d. | 2018 |
| 30. | Procurement of pilot assemblies ST-1-SE, 6 pcs., Rijeka oil Refinery, INA d.d. | 2018 |
| 31. | Procurement of Draka ignition cable, Rijeka oil Refinery, INA d.d. | 2018 |
| 32. | Procurement and installation of aditional orifices on burners of heater BA-5001, 320 pcs. (hydrogen reformer unit), Pančevo oil Refinery, NIS a.d. | 2019 |
| 33. | Procurement of igniter SA51 with and ionisation probe, 1 pcs., Smederevo, HBIS GROUP Serbia Iron & Steel | 2019 |
| 34. | Procurement of process gas heaters VTK-550-210, 2 pcs. and process gas heater VTK-850-210, 1 pcs.,Škofja vas, Frutarom Etol | 2019 |
| 35. | Optimisation of Saacke burners on steam boilers G4 and G5, Rijeka oil Refinery, INA d.d. | 2019 |
| 36. | Procurement of John Zink PMS-3 burners with burner tiles, 165 pcs., Brod oil Refinery a.d., OPTIMA Group | 2018/2019 |
| 37. | Technical assistance and procurement of spare parts for maintenance of John Zink burners - annual contract, Pančevo oil Refinery, NIS a.d. | 2018/2019 |
| 38. | Procurement of John Zink burners spare parts - annual contract, Sisak oil Refinery, INA d.d. | 2019 |
| 39. | Procurement of John Zink PSFRC-8R-WG burner, 1 pcs., Rijeka oil Refinery, INA d.d. | 2019 |
