SEA LIBERTY (IMO: 9293600) is a liquefied petroleum gas (LPG) carrier operating under the flag of Thailand. Built in 2003, this coastal LPG tanker plays an important role in regional clean energy distribution across Southeast Asia. Classified by Nippon Kaiji Kyokai (ClassNK), the vessel combines Japanese shipbuilding design with pressurized gas handling capabilities.
Primary Particulars & Identification
The following summary provides the core registry, classification, and operational identifiers for the SEA LIBERTY:
Property
Specification Detail
Vessel Name
SEA LIBERTY
IMO Number
9293600
MMSI Number
567535000
Call Sign
HSB5886
Vessel Type
Gas Carrier (LPG / Pressurized Tanker)
Flag State
Thailand
Port of Registry
Bangkok
Classification Society
Nippon Kaiji Kyokai (ClassNK)
Year of Build
2003
Principal Hull Dimensions & Tonnage Metrics
Engineered with a streamlined coaster hull form, the SEA LIBERTY is optimized to navigate shallow-draft access channels and coastal gas discharge terminals throughout the Indo-Pacific region.
• Length Overall (LOA): 97.69 meters
• Length Between Perpendiculars (LBP): 89.90 meters
• Beam (Breadth Moulded): 16.00 meters
• Moulded Depth: 7.20 meters
• Summer Draft: 5.413 meters
• Deadweight Tonnage (DWT): 3,857 metric tonnes
• Gross Tonnage (GT): 3,435 tonnes
• Net Tonnage (NT): 1,031 tonnes
Its 16.00-meter beam paired with an 89.90-meter LBP provides stability during sea passages while maintaining a low draft footprint, allowing seamless berth access at regional ports.
Cargo Handling & Containment Capabilities
As a specialized pressurized gas carrier, SEA LIBERTY is built to handle liquefied petroleum gas products under controlled pressure conditions.
• Total Liquid Cargo Capacity: 3,518 m³
• Pressure Rating: Designed to transport cargo under tank design pressures up to 1.77 MPa at ambient temperature.
• Class Notation:NS*(Tlg 1.77MPa & 0 degrees C 2PG) MNS*
• Safety Equipment: Equipped with dedicated gas detection systems, emergency shut-down (ESD) valves, ballast water management (BWM), and remote control fire-extinguishing systems (RCF).
The vessel’s cargo containment system relies on cylindrical pressure vessels capable of maintaining propane and butane mixtures in liquid state without requiring onboard refrigeration units, making short-sea logistics efficient.
Engine Machinery & Performance
The propulsion system of SEA LIBERTY is powered by a Japanese single-engine installation suited for sustained coastal transit.
• Main Engine: 1 × Akasaka Diesels Ltd. 2-stroke, 5-cylinder diesel engine (Bore 330 mm × Stroke 1,050 mm)
• Total Engine Output: 2,700 kW (3,620 hp) @ 210 RPM
• Maximum Sea Trial Speed: 15.8 knots
• Average Operating Speed: 10.8 to 11.5 knots
• Auxiliary Power: 3 AC electrical generators producing a combined 1,010 kVA output
• Propeller Configuration: Single fixed-pitch propeller
Vessel History & Class NK Standards
Built under Yard Hull No. 1231 at Shitanoe Shipbuilding in Usuki, Japan, the vessel entered service in 2003 under the name LUNA GAS before later operating as CHARLOTTE KOSAN. Re-flagged to Thailand as SEA LIBERTY, the ship continues to hold active status under ClassNK.
ClassNK oversight verifies that the vessel meets international maritime safety standards, including compliance with the International Gas Carrier Code (IGC Code), MARPOL pollution prevention conventions, and SOLAS safety requirements. Routine class surveys evaluate hull structural integrity, pressure vessel containment, and main engine performance to ensure safe operations during hazardous gas transit.