Water & DesalinationDesalination
High-pressure pump casing (RO feed, 60–80 bar)
API 610 pump standard. NACE MR0175 sulfide stress cracking requirements not typical but SS grade selection per seawater corrosion resistance (PREN >40 for super duplex).
Specifications
Material
Super Duplex SS ASTM A890 Gr5A; Duplex CD4MCu for moderate chloride
Grades
CD4MCu
Material Class
Super DuplexDuplex
Applicable Standards
ASTM A890 Gr5ANACE MR0175API 610
Service Conditions
seawaterchloridecorrosion
Common Processes
Ceramic shell investment casting (complex volute geometry); resin sand for larger units
NDT & Inspection
RT (100% pressure boundary sections); PT (all SS); hydrostatic 1.5× rated; CMM dimensional
Typical Specs & Notes
API 610 pump standard. NACE MR0175 sulfide stress cracking requirements not typical but SS grade selection per seawater corrosion resistance (PREN >40 for super duplex).
⚠ Caveats
NACE MR0175 sulfide stress cracking requirements not typical but SS grade selection per seawater corrosion resistance (PREN >40 for super duplex).