The LNG terminal consists of the following main elements:
- Jetty with auxiliary facilities
- High pressure connection pipeline
- Water supply connection system
FSRU (Floating Storage & Regasification Unit) vessel consists of LNG (Liquified Natural Gas) loading and unloading equipment, LNG storage tanks, LNG regasification equipment, BOG (Boil Off Gas) management equipment, natural gas send-out equipment, engine room and installations for electricity production, propulsion equipment, the operator's room including instrumentation necessary to monitor individual parameters and systems, fire protection systems and associated facilities.
The FSRU vessel is equipped with four LNG storage tanks with a total capacity of 140,206 m3, three LNG regasification units with a maximum regasification rate of 451,840 m3/h, and a power plant which will, in addition to generating electricity for the purpose of operating the terminal, deliver electricity to the power distribution network, as part of vessel’s BOG management.
The FSRU vessel will operate with a maximum regasification capacity of up to 300,000 m3/h, or 2.6 billion m3/annually, in accordance with the technical capacity of the gas transmission system of the Republic of Croatia.
In regasification units, LNG regasification is done through heat exchangers by seawater intake, which transfers heat to glycol as an intermediate fluid, and which is afterwards discharged back into the sea. In the further process, glycol, as an intermediate fluid, transfers heat to the LNG, which is regasified i.e. converted from liquified to a gaseous state. Natural gas is then delivered to the connecting gas pipeline via high pressure offloading arms and afterwards to gas transmission system of the Republic of Croatia.
In addition, the FSRU vessel is equipped with various security systems composed in several levels of security to completely eliminate possibility of incident situations.
The fire protection of the FSRU vessel consists of fire and flame detectors and fire alarms, while the vessel is protected from fire by several protection systems.
Natural gas leakage protection is achieved by an independent system equipped with different type of natural gas detectors.
In the event of an incident, all systems work together whereby they activate the vessel’s ESD (Emergency Shut Down) system which will completely shut down all vessel operations and automatically trigger various measures of protection.
For safety reasons, the FSRU is also equipped with quick release hook mooring system to carry out the unmooring of LNGC (LNG Carriers) in a safe and fast way, in case of an emergency.
The jetty of the LNG terminal consists of the jetty head, breasting dolphins for FSRU berthing, mooring dolphins for FSRU and LNGC (LNG Carrier) berthing, quick release hooks, the access bridge, the high pressure loading arms with connecting pipeline, pig launching station, firefighting system, terminal control building, and associated facilities.
The FSRU vessel moored to the jetty, is connected to the mooring system and also to high pressure offloading arms through which natural gas (after being regasified) enters the connecting pipeline. In addition to the mooring of the FSRU, the jetty is also designed for the indirect acceptance of the LNGC, which is moored side by side to the FSRU vessel during transfer of the LNG.
Jetty head is the main part of the jetty, constructed as a platform on concrete piles. Along the main part is a central fender with a depth of sea along berths of at least 15 meters. High pressure offloading arms with a connection to the connecting pipeline are located on the top part of the jetty head. The gas is transported through the connecting pipeline to the Omišalj gas node, to which the connecting pipeline is connected by pig launcher station. Omišalj gas node is connected to transmission system of the Republic of Croatia. Access bridge, firefighting equipment and other auxiliary equipment are also connected to the Jetty head.
Breasting dolphins for FSRU vessel berthing are constructed on concrete piles, equipped with fenders for safe berthing of the FSRU vessel.
The mooring dolphins for FSRU vessel and LNGC mooring are constructed on concrete piles, equipped with quick release hook mooring system in order to carry out unmooring of FSRU vessel in a safe and fast way in case of emergency.
The jetty head, breasting dolphins and mooring dolphins for FSRU and LNGC berthing are connected by catwalks. A 90 m long access bridge, with access pavement and sidewalk, connects the jetty head with onshore part of the jetty.
On the onshore part of the jetty, pipeline pig launching station, connecting gas pipeline, water supply system, terminal control building and other auxiliary facilities are all located.
CONNECTING GAS PIPELINE
The connecting gas pipeline, with nominal diameter 40” and maximal operating pressure 100 bar, is 4,2 km long. It runs from the jetty head through access bridge to connection point on the onshore part of the LNG terminal and all the way to the Omišalj gas node. At the starting and the end point of the pipeline, pig launching and receiving stations are installed to perform various maintenance operations. Main purpose of the connecting pipeline is to connect the LNG terminal facility with the gas transmission system.
CONNECTING WATER SUPPLY SYSTEM
The 3½” connecting water supply line with a total length of around 2,5 km is connected to the public water supply system at manhole near the state road D102 and runs alongside state road D129 on its way to the LNG terminal. Main purpose of the water supply system is to provide water on the LNG facility for sanitary purposes during terminal operations, as well as for the initial and any afterward loading of terminal firefighting tank.