Croatia’s gas transmission network has achieved a significant upgrade following the successful integration of two key pipeline segments, the Zabok–Lučko and Kozarac–Sisak pipelines. This integration was carried out during a meticulously planned four-day shutdown, adhering to a strict 96-hour interruption window to minimize service disruption.
The connection of the Zabok–Lučko section at the Lučko gas hub and the Kozarac–Sisak line into the existing Zagreb East–Kutina pipeline near the Kozarac node marks a critical enhancement in Croatia’s gas distribution capabilities. The operation was managed by Plinacro, the national system operator, with construction conducted by Monter and other contractors.
During the shutdown period, rigorous safety and environmental procedures were enacted. The process began with the evacuation of natural gas from the system to comply with stringent methane emission standards. Subsequently, nitrogen was introduced into the infrastructure to ensure safe working conditions. Following completion of the connections, natural gas gradually replaced nitrogen as pressure levels were restored to normal operational standards.
This complex operation required precise coordination across two separate sites, enabling work to proceed without additional service interruptions. During this maintenance phase, gas inflow from the LNG terminal on Krk was temporarily suspended, necessitating that the southern section of the network rely solely on domestic production from northern Adriatic sources. Concurrently, approximately 90 kilometers of pipeline were isolated from active service.
The successful execution of this project without unforeseen setbacks underscores an important milestone in bolstering the resilience and flexibility of Croatia’s gas transmission infrastructure. This development not only enhances operational reliability but also positions Croatia strategically within regional energy markets.
