Long Weld Neck Flange

Engineered Strength for Pressure-Critical Applications

🔩 Structural Features

• One-piece forged flange with an extended tapered neck

• Designed to replace pipe nipples or weld-on nozzles

• Tapered neck provides reinforcement and ensures smooth flow transition

• Commonly used in:

  • Pressure vessels

  • Heat exchangers

  • Storage tanks

• Available flange face types:

  • RF (Raised Face)

  • RTJ (Ring-Type Joint)

  • FF (Flat Face)

🔧 Welding Method

• Butt-welded at the base of the neck

• Forms a continuous, integral structure with vessel or piping

• Ensures high mechanical strength and stress resistance

• Requires high-quality welding — often with:

  • Radiographic (RT) or

  • Ultrasonic (UT) non-destructive testing

🛠️ Applications

Ideal for critical industrial systems such as:

• 🛢 Pressure vessels

• 🏗 Column towers

• 🔥 Heat exchangers

• 🧊 Cryogenic systems

• 🧪 Chemical processing plants

• ⚡ Power generation equipment

• 🔩 Custom fabrications requiring nozzle reinforcement

📏 Size Standards

• Range: 1/2” to 120” (DN15–DN3000)

• Reference Standards:

  • ASME B16.5 (2”–24”)

  • ASME B16.47 (Above 24”)

  • MSS-SP-44 (Large-diameter applications)

⚙️ Pressure Ratings

• Class: 150#, 300#, 600#, 900#, 1500#, 2500#

• Custom designs available for pressures exceeding standard ratings

🧪 Available Materials

• Carbon Steel

• Stainless Steel

• Alloy Steel

• Duplex Stainless Steel

• Nickel Alloys

✅ Recommendation

Long Weld Neck Flanges are the optimal solution where:

• High strength and structural continuity are required

• Reinforced nozzles or extended necks are necessary

• Applications demand reliable performance under extreme conditions (pressure, temperature, stress)