Shipbuilding requires the complete range of buttweld fitting materials — CuNi 90/10 for seawater systems, SS 316L for cargo and accommodation, WPB for engine room piping, and duplex for ballast water treatment systems. Classification society approval (Lloyd's, DNV, BV) is standard.
Main seawater cooling circuits, condenser water boxes, and overboard discharge. CuNi 90/10 is the universal standard — natural biofouling resistance eliminates antifouling coatings and provides decades of service life.
Chemical tanker cargo piping, LNG carrier systems, and product tanker piping. SS 316L for general cargo. Duplex for aggressive chemical cargoes. All fittings must be classification society approved.
Main engine cooling, lube oil systems, fuel oil piping, and auxiliary machinery piping. WPB for general service below 427°C. SS 316L for corrosive fluid service in engine room environments.
Modern IMO-compliant ballast water treatment systems require duplex or SS 316L for electrochlorination or UV systems in contact with seawater + disinfectants. A growing and significant market for duplex fittings.
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