For dual-fuel vessels, dry-docking is the ideal window for overhauling and upgrading the FGSS (Fuel Gas Supply System). Dry-dock periods are short and several trades work in parallel, so insufficient preparation easily leads to hidden defects and spare part shortages, lowering efficiency and raising cost. Our pre-docking FGSS inspection service provides a full diagnosis of system condition in advance, giving a sound basis for dry-dock planning and making the docking more efficient, less stressful and less expensive.

1. Why a pre-docking FGSS inspection is indispensable
The FGSS is the energy heart of a dual-fuel vessel and its condition directly affects the quality of the dry-docking. On many vessels hidden FGSS faults only come to light once the ship is in dock, disrupting the plan and causing off-hire losses. A pre-docking inspection is the key to avoiding that risk:
- Avoiding surprises in dock: latent problems are identified in advance so that unforeseen issues do not disrupt the schedule.
- Accurate scoping of the dry-dock: the actual condition of the system defines the core work, avoiding blind overhaul — repair what needs repair, replace what needs replacement.
- Lower cost and downtime: spare parts are determined in advance, shortages no longer delay the schedule, unnecessary work is avoided and labour and material costs fall.
- Long-term operation in view: the inspection supports the current docking and also provides long-term maintenance recommendations that keep the FGSS in optimum condition.
2. A professional team with complete coverage
Our pre-docking FGSS inspection is carried out by professional engineers to ensure it is thorough, accurate and efficient:
- Professional team: one or two senior engineers are assigned according to system complexity and carry out the inspection and diagnosis from start to finish.
- Flexible and efficient: completion within 48 hours at most, with engineers able to join the vessel at a location of your choice without affecting her trading.
- Comprehensive investigation: every FGSS component is checked so that the real condition of the system is known, with nothing left out.
- Professional report: a written report sets out system condition clearly and gives recommendations on spare parts, maintenance and upgrades.
3. From dry-dock preparation to long-term optimisation
A single pre-docking inspection secures a smooth dry-docking and also supports long-term stable FGSS operation. Its value lies in three areas.
(1) Condition-based, accurate maintenance
Inspection results, system configuration and classification society rules together allow spare parts to be recommended precisely — sound components are not replaced, unnecessary parts are not ordered and essential parts are never missing. Cost is optimised and budget and resources can be planned in advance.
(2) Upgrade and optimisation for lower cost and higher efficiency
We provide vessel-specific FGSS modification and upgrade proposals aligned with the latest technology and rules, optimising the system, improving reliability and delivering cost benefits over the long term.
(3) Time saved, effort saved, risk avoided
Professional engineers attend the vessel to carry out the inspection, reducing the workload on board. A complete investigation of latent defects avoids surprises in dock, shortens the schedule and reduces off-hire losses.

4. Professional support that gives confidence in the dry-dock
Our engineers have many years of FGSS service experience, know the gas supply systems of all kinds of dual-fuel vessels and keep up to date with the latest designs and rule requirements, providing accurate inspection and dependable advice.
With a pre-docking inspection completed, the full dry-dock process can be defined in advance; with the inspection report and spare part list in hand, the docking runs efficiently and smoothly.
5. Summary
Efficient FGSS dry-docking rests on advance preparation, and its core is precise knowledge of system condition. Our pre-docking inspection brings a professional team, complete investigation and accurate recommendations to the dry-dock, reducing surprises, saving cost and improving efficiency — so that one docking delivers lasting stability.
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

