Pulp & Paper Solutions
Corrosion-resistant flanges for bleach, caustic, and recovery boiler service.
Overview
Pulp and paper mills operate continuously with exposure to bleach sequences (chlorine dioxide, hypochlorite), caustic (sodium hydroxide), and recovery boiler flue gas. Corrosion rates in these environments exceed most industries. 24/7 operation means zero tolerance for planned maintenance; flanges must deliver multi-year service life.
Applications
Bleach plant manifolds and piping
Caustic circulation systems
Kraft recovery boiler inlet/outlet
Black liquor pipeline connections
Condensate and cooling water lines
Digester nozzle flanges
Chemical storage tank connections
Relevant Standards
- •ASME B16.5 (base specification)
- •TAPPI TIP 0304-24 (pulp/paper industry guide)
- •NACE SP0403 (caustic service)
Material Grades
ASTM A182 F304L
non-magnetic austenitic
ASTM A182 F316L
molybdenum for chlorides
ASTM A182 F321
titanium-stabilized
Duplex 2205
chloride service temperature limit ~250F; verify chloride concentration in recovery boiler service
Hastelloy G-30
recovery boiler flue gas
Common Pressure Classes
Class
150
Class
300
Class
600
Typical Service Specifications
Pulp mill flanges operate at 150-600 PSI with temperatures from 80°F to 600°F (recovery boiler). Chloride/sulfide stress corrosion cracking (CSCC) and pitting dominate failure modes. Material selection, gasket compatibility, and bolt pre-tension all affect corrosion performance.
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