Marine & Shipbuilding Solutions
Duplex and super-duplex for seawater and offshore applications.
Overview
Marine and offshore applications expose flanges to seawater, high salinity, and corrosive salt-spray environments. Duplex and super-duplex stainless steels provide unmatched corrosion resistance for subsea, deck, and hull-mounted equipment. DNV, ABS, and Lloyd certification ensures regulatory compliance for vessel classification.
Applications
Seawater cooling system manifolds
Ballast and bilge pump connections
Engine and turbine inlet/outlet flanges
Fuel and lube oil system nozzles
Cargo line deck connections
Subsea pipeline field joints
Riser and jump-over connections
Relevant Standards
- •DNV-GL Rules for Classification
- •ABS Rules for Building and Classing Ships
- •Lloyd's Register Standards
- •ASME B16.5 (industrial backup)
- •ISO 5873 (marine variants)
Material Grades
ASTM A182 F304/F316L
light-duty seawater
Duplex 2205
standard seawater service
Super-duplex 2507/2707
extreme chloride
Inconel 625
ultra-high-corrosion resistance
Common Pressure Classes
150
PSI
300
PSI
600
PSI
Typical Service Specifications
Marine flanges operate at 150-600 PSI with seawater and temperatures from -20°F (arctic service) to 250°F (hot well service). DNV/ABS certification requires third-party testing and traceability. Duplex minimum PREN (Pitting Resistance Equivalent Number) typically 35+.
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