Defying the Splash Zone. Engineered with 2205 Duplex Stainless Steel for Unrivaled Pitting Resistance in Marine Logistics.
Engineering for the Splash Zone
The transition piece of an offshore wind turbine is a chaotic intersection of mechanical stress and chemical aggression. The base lifting platform (or boat landing lift) serves as the primary logistical artery for personnel and equipment transferring from Crew Transfer Vessels (CTVs) to the tower. These hydraulic systems operate in the “splash zone”—the most corrosive environment on the planet. Here, cycles of wetting and drying concentrate chlorides on metal surfaces, accelerating pitting corrosion at rates that devour standard carbon steel. A failed lifting cylinder at the tower base isolates the turbine, making maintenance impossible and resulting in exponential revenue loss.
Ever Power rejects the industry’s reliance on temporary fixes. We engineer Tower Base Lifting Cylinders using a metallurgy-first approach. By standardizing on 2205 Duplex Stainless Steel for the piston rod and utilizing specialized marine-grade coating systems for the barrel, we create a hermetically sealed actuator capable of withstanding the relentless assault of North Sea waves. This is not merely a hydraulic component; it is a strategic asset for the longevity of your offshore wind farm.
Virtual Manufacturing Verification
Transparency is the bedrock of offshore safety. Before you specify components for your marine assets, verify our capabilities. Step into our digital twin facility in Hangzhou and inspect our CNC machining centers and salt-spray testing labs from your screen.
The Science of Corrosion Resistance
MATERIAL
2205 Duplex Steel
The “Duplex” microstructure (50% ferrite, 50% austenite) gives 2205 alloy a Pitting Resistance Equivalent Number (PREN) above 35. Unlike 316L, which is susceptible to crevice corrosion in warm seawater, 2205 provides superior resistance to chloride stress corrosion cracking. This ensures the rod surface remains smooth, preventing the “cheese grater” effect that destroys wiper seals.
COATING
ISO 12944 C5-M
The cylinder barrel is protected by a rigorous Norsok M-501 compliant coating system. We utilize a thermally sprayed zinc (TSZ) primer followed by high-build epoxy intermediates and a polyurethane topcoat, achieving a total dry film thickness (DFT) exceeding 350 microns. This barrier is tested to withstand 10,000 hours of salt spray exposure without blistering.
SEALING
Marine Excluders
Salt crystals are abrasive. We integrate a dual-wiper system specifically for platform lifts. The primary wiper is a robust marine-grade polyurethane designed to fracture crystallized salt on the rod. A secondary PTFE seal ensures zero water ingress into the hydraulic fluid, protecting the valves and pumps from contamination failure.
Operational Reliability in High Sea States
The image highlights the polished surface finish of our 2205 Duplex rod. In offshore applications, surface roughness is a vector for corrosion. We polish to Ra 0.2 or better.
Combined with our welded body construction (eliminating tie-rods that trap salt), Ever Power cylinders provide a maintenance-free service life that aligns with the major overhaul cycles of the turbine itself.
Technical Parameters: Tower Base Lifting Series
| Feature | Standard Marine Spec | Ever Power “Splash Zone” Spec |
|---|---|---|
| Rod Material | 316L Stainless Steel | 2205 Duplex Stainless Steel |
| Barrel Coating | Epoxy Paint (200μm) | TSZ + Epoxy + PU (350μm) |
| Wiper Seal | Standard NBR | Dual Lip PU + Ice Scraper |
| Working Pressure | 160 Bar | 210 Bar (250 Bar Peak) |
| Pitting Resistance (PREN) | ~24 | >35 (Superior) |
| Bearings | Greased Steel | Self-Lubricating Composite |
Beyond the Base: Total Offshore Solutions
Ever Power’s expertise extends throughout the offshore structure. Our corrosion-resistant hydraulic systems are deployed in various critical functions on the transition piece and substructure:
- J-Tube Actuators: Hydraulic systems for positioning cable protection tubes, requiring long-term subsea durability.
- Davit Crane Cylinders: Lifting cylinders for the platform cranes used to hoist tools and spare parts.
- Access Gangway Systems: Motion-compensated cylinders for “Walk-to-Work” gangways connecting vessels to the tower.
Strategic Sourcing: Offshore Quality, China Efficiency
Ever Power bridges the gap between European offshore standards and Chinese manufacturing efficiency. Located in a specialized coastal industrial zone, we have direct supply agreements with premium stainless steel foundries. This allows us to source 2205 Duplex at scale, making “over-engineered” material choices economically viable for your project.
We are not a catalog seller. We act as your engineering partner. From retrofitting legacy foundations to supplying OEM components for new floating wind platforms, our team provides full DNV-GL compliant documentation. We handle the complexity of international logistics, ensuring your components arrive ready for installation.
Frequently Asked Questions
Why is 2205 Duplex better than 316L for offshore lifting?
2205 Duplex offers significantly higher yield strength and superior resistance to pitting corrosion compared to 316L. In the “splash zone” where salt concentration is highest due to evaporation, 316L can suffer from crevice corrosion, whereas 2205 remains stable.
How do you protect the cylinder body if it’s not stainless steel?
For the cylinder barrel, we apply a Norsok M-501 System 1 compliant coating. This involves thermal sprayed zinc (metallization) followed by multiple layers of marine epoxy and a UV-resistant topcoat, creating a robust barrier against seawater.
What is the typical lead time for custom offshore cylinders?
Due to the sourcing of specialized 2205 material and the multi-stage coating process, lead times are typically 40-50 days. We recommend planning maintenance retrofits in advance, although we can offer expedited tracks for critical failures.
Can you integrate load holding valves for safety?
Yes, safety is paramount for personnel lifts. We integrate dual pilot-operated check valves (overcenter valves) directly onto the cylinder ports. This prevents the platform from dropping even in the event of a catastrophic hose failure.
Do you ship to North Sea or Taiwan offshore projects?
Yes, we are a global supplier. We handle all logistics including DDP (Delivered Duty Paid) service. Our packaging is specifically designed for ocean freight, utilizing vacuum sealing and fumigated heavy-duty crates.
Reliability in the Splash Zone
Don’t let corrosion ground your maintenance crews. Upgrade to Ever Power Duplex Series.
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