Long Weld Neck Flange – Engineered Strength for Demanding Applications
Release Time:
Jun 16,2025
Designed for pressure vessels and critical systems, our long weld neck flanges ensure structural integrity, smooth flow transition, and exceptional performance under high-pressure and high-temperature conditions.
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)
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Contact Info
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Middle Section of Wuliyao, Yanshan County, Cangzhou City, Hebei Province, the People's Republic of China
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