The FGSS (Fuel Gas Supply System) is the "energy heart" of an LNG dual-fuel vessel, and its stable operation has a direct bearing on voyage safety and operating efficiency. Professional FGSS after-sales service is built on prevention rather than repair, and system inspection is the key element. Below we set out the core points of an FGSS inspection and what gives professional after-sales service its substance.
1. The core of an FGSS inspection: complete coverage, focused investigation
An FGSS inspection examines the overall operating condition of the system, with particular attention to valves, instrumentation and safety control systems, cryogenic pumps, BOG compressors, vaporisers, fuel storage tanks and the TCS. The work falls into five modules, each of them relevant to system safety.
(1) System operating condition
- Review FGSS-related work records and maintenance files in the ship's maintenance system so that maintenance remains traceable.
- Check the overall condition of the system together with the crew and investigate known operating problems.
- Review alarm messages and operating trends on the HMI to catch abnormal signals.
- Take stock of FGSS spare parts on board and define future requirements so that fault handling is not delayed.
(2) Valve inspection
- Test valve actuator function, check the air supply lines for leakage and verify valve feedback signals, together with a visual inspection.
- Check manual valves for freedom of movement and tightness so that emergency operation is assured.
- Check valve locking devices to guard against maloperation.
- Test pipe section valves for internal leakage and check the tightness of adjacent valves.
- Assess possible leakage from icing at safety valve outlets.
(3) Instrumentation, control and safety systems
- Check instruments against a standard reference source and recalibrate where deviations are found.
- Inspect control cabinets to confirm that wiring is secure, undamaged and free from abnormal heating.
- Carry out on-line C&E functional testing and ESD function testing.
(4) Fuel storage tanks and TCS
- Visual inspection, focusing on abnormal condensation and icing.
- Detect gas leakage with a leak detector to eliminate safety risks.
- Check tank shell cold spots and any abnormal rise in tank pressure.
- Check gas lock sensors and alarms for correct function.
(5) Pumps, BOG compressors and other auxiliary equipment
- Check equipment operating condition together with crew feedback and investigate known problems.
- Verify that the supplier's IOM manual recommendations are being followed so that maintenance stays within specification.
- Use the service matrix to confirm that the consumables and parts required for scheduled maintenance are complete.
2. The value of professional inspection: not only checking, but safeguarding
FGSS after-sales service is often assumed to be about fault repair. In reality professional inspection is the core of it, and its value shows in several ways:
- Lower failure rates: hidden problems are found early, reducing the risk of unplanned off-hire.
- Longer system life: disciplined maintenance slows equipment ageing and lowers operating cost.
- Voyage safety: components are confirmed to meet specification, preventing safety and quality incidents.
- Higher operating efficiency: downtime is reduced, schedules are protected and repair costs are saved.
3. Summary
Stable FGSS operation depends on careful inspection, and safe ocean passages depend on professional after-sales support. From core components to auxiliary equipment, every inspection strengthens the safety line around the vessel's energy heart.
Choosing dependable FGSS after-sales service means choosing active prevention and comprehensive protection, keeping the FGSS in its best operating condition voyage after voyage.
Tecway has an experienced FGSS service team that has taken part in and successfully completed numerous newbuilding and retrofit projects, building up solid engineering practice along the way.
Drawing on a mature technical framework and proven site implementation capability, we provide whole-life technical support for FGSS projects, covering design optimisation, installation guidance, commissioning support, risk control and long-term operation and maintenance, so that projects are delivered safely, run stably and continue to create value.
Contact us
Pillar Liu | Technical Director
Email: pillar.liu@tecwayintl.com