π Case Study
Offshore Wind Hybrid ESS Container on North Sea Platform
Salt-corrosive environment; no fire brigade access; mandatory 4-hour fire resistance per NORSOK Z-015 and DNV-RP-0499
ποΈ Project Overview
2.5 MWh sodium-ion + LFP hybrid system housed in ISO container on unmanned offshore platform
π― Challenge
Salt-corrosive environment; no fire brigade access; mandatory 4-hour fire resistance per NORSOK Z-015 and DNV-RP-0499
π§ Design Approach
Double-skinned stainless steel enclosure, intumescent coating + water spray external protection, explosion-proof vent ducting routed overboard
π Design Diagram
AI-generated project design illustration
π Key Calculations
Intumescent Coating Thickness
t = k Γ βt_r
Result: 22 mm
Achieved 4-hr rating per EN 13381-8
Overboard Vent Velocity
v = Q / A
Result: 18.3 m/s
Prevented re-entrainment of toxic effluent
π Results
DNV type-approved; survived Category 4 storm with no seal degradation or thermal eventπ‘ Lessons Learned
- β’Sodium-ion off-gassing differs significantly from Li-ionβrequired custom gas sensor calibration
- β’Water spray must activate *before* intumescent expansion to avoid steam explosion risk
β Key Takeaways
- 1Sodium-ion off-gassing differs significantly from Li-ionβrequired custom gas sensor calibration
- 2Water spray must activate *before* intumescent expansion to avoid steam explosion risk