Custom Hydraulic Cylinders for Offshore LNG Mooring System
Client: Offshore LNG Project, West Africa
Delivery: 12 Cylinders, Φ600mm x 4500mm Stroke
Industry: Marine & Offshore
Delivered by: Yangzhou Jiangdu Yongjian Co., Ltd.
Project Background
A floating liquefied natural gas (FLNG) production and storage vessel operating off the coast of West Africa required 12 large-scale, custom-designed hydraulic cylinders for its mooring tensioner system. These cylinders play a critical role in maintaining vessel stability under harsh offshore conditions.
The client needed a partner with proven expertise in designing and delivering large-diameter hydraulic cylinders capable of operating for decades in highly corrosive marine environments. Yongjian was selected for its extensive experience, technical capabilities, and commitment to customized hydraulic solutions.
Engineering Challenges
The FLNG system required horizontally installed cylinders with large strokes and built-in accumulators, operating at a working pressure of 230 bar. These cylinders had to withstand:
Continuous exposure to seawater
Impact from floating debris and offshore equipment
Sand and dust carried by ocean winds
30+ years of operation without major failure
Each cylinder featured:
Bore diameter: 600mm
Stroke: 4500mm
Material: Carbon steel body, stainless steel piping
Additional features: Integrated accumulators, advanced manifold blocks
Corrosion Protection Solution
To ensure long-term reliability, Yongjian applied an advanced laser-cladded anti-corrosion coating on the cylinder rods. This proprietary solution offers exceptional resistance to corrosion, impact, and abrasion—ideal for marine conditions. Unlike traditional coatings, it forms a dense metallurgical bond with the rod, preventing peeling, cracking, or delamination.
The coating is also field-repairable, minimizing downtime and maintenance costs over the cylinder’s lifespan. Its proven performance has been validated in multiple offshore deployments.
Manufacturing & Delivery
Yongjian’s engineering team worked closely with the client to complete the design and delivery within 10 months. The project was manufactured and tested in our state-of-the-art facility in Jiangsu, China, supported by skilled technicians and rigorous quality inspection protocols.
Result & Value
Our custom solution provided:
Enhanced reliability and corrosion resistance
Simplified maintenance with field-repairable rods
Increased project safety and uptime
Lower total cost of ownership
Yongjian’s cylinders now contribute to the stable mooring and long-term performance of one of West Africa’s key offshore LNG facilities.
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