Titanium and Nickel flanges

In chlor-alkali production, titanium and nickel flanges are crucial for handling highly corrosive environments, typically found in the following areas:

Applications of Titanium Flanges

Titanium flanges offer excellent corrosion resistance, especially suitable for the brine electrolysis system and other highly corrosive environments in chlor-alkali plants:

1. Brine Electrolysis System
   • Inlet and Outlet of Electrolysis Cell: In chlor-alkali production, electrolysis cells produce a significant amount of chlorine gas and hypochlorite, both highly corrosive. Titanium flanges are used for inlet and outlet connections, providing a durable seal in highly corrosive conditions.
   • Anode Inlet and Outlet Flanges: Titanium flange is ideal for the anode inlets and outlets of electrolysis cells due to its excellent resistance to chloride ions.
2. Caustic Storage and Transportation Systems
   • High-Concentration Alkaline Environment: Titanium flanges in caustic storage and transportation systems can effectively withstand high corrosion levels, reducing equipment maintenance requirements.
3. Sodium Hypochlorite Production System
   • Accelerated Corrosion Resistance: Sodium hypochlorite is highly corrosive. Titanium and nickel flanges are frequently selected for these production processes to reduce equipment wear from corrosion.
4. Exhaust Gas Treatment System
   • Acidic Gas Resistance: Chlorides and acidic gases in exhaust treatment systems require high corrosion resistance at connection points. Titanium flanges are effective in extending the life of equipment by preventing damage from acidic gases.
5. Evaporation Process
   • Titanium and Nickel Flanges: Used in the pipes and connections of evaporators to prevent corrosion and improve efficiency.

Classification and Uses of Titanium Flanges

1. Pure Titanium Flange (Grade 2)
   • Characteristics: Performs well in neutral or mildly acidic environments, commonly used in lower-corrosion applications.
   • Applications: Suitable for brine electrolysis, and chlorine and caustic storage and transport systems, providing high corrosion resistance in chloride environments.
2. Gr7 Flange (Ti-0.2Pd)
   • Characteristics: Contains 0.2% palladium, with better resistance to crevice and pitting corrosion than pure titanium, suitable for highly acidic environments.
   • Applications: Widely used in chlorine cooling, sodium hypochlorite production, and high-concentration chloride and acidic gas environments.

Applications of Nickel and Nickel Alloy Flanges

Nickel and nickel alloy flanges offer outstanding corrosion resistance, making them suitable for highly corrosive environments in chlor-alkali plants:

1. Nickel Flange (Pure Nickel Flange)
   • Characteristics: Pure nickel is highly resistant to corrosion in reducing acids and alkaline environments, ideal for high-temperature alkaline media.
   • Applications: Commonly used in brine electrolysis systems, chlorine transport systems, and high-temperature caustic heat exchanger connections.
2. Nickel Alloy Flange
   • Types and Applications:
     • Inconel Flange: Suitable for high-temperature environments, resistant to sulfur gases and chlorides.
     • Monel Flange: Resists seawater and alkaline solution corrosion, suitable for low-temperature saltwater environments.
     • Hastelloy Flange: Resistant to strong acids and chlorides, often used in acidic gas handling equipment and exhaust gas treatment systems.

These flanges are widely applied in exhaust gas treatment, acidic gas pipelines, strong acid transport, which effectively enhancing equipment stability and longevity.

Flanges standard: ASME B16.5

• According to chemical industry standards, flanges are classified as:
  • Plate Slip-On Flange (PL)
  • Neck Slip-On Flange (SO)
  • Neck Welded Flange (WN)
  • Integral Flange (IF)
  • Socket Weld Flange (SW)
  • Threaded Flange (Th)
  • Lap Joint Flange with Welded Ring (PJ/SE)
  • Blind Flange (BL)
  • Lap Joint Flange with Slip-On Ring (PJ/PJ)
  • Lined Blind Flange (BL(s))
• According to petrochemical (SH) industry standards, flanges are classified as:
  • Threaded Flange (PL)
  • Welded Flange (WN)
  • Slip-On Flange (SO)
  • Socket Weld Flange (SW)
  • Lap Joint Flange (LJ)
  • Blind Flange (not indicated)