Weld Nech flange

1. Product Description

The Weld Neck Flange is designed for applications that require high strength, reliability, and leak-proof sealing. The flange is welded to the pipe, providing a strong, pressure-resistant connection that is ideal for high-pressure and high-temperature applications. Its neck design helps reduce stress concentrations at the pipe-flange connection, improving durability and resistance to fatigue. Locus Brand Weld Neck Flanges are manufactured using high-quality materials, ensuring top-tier performance in industries like oil and gas, chemical processing, power generation, and more.

2. Product Specifications

• Material: Carbon Steel (A105), Stainless Steel (304, 316, 316L), Alloy Steel (A182)
• Size Range: ½” to 48″ (DN 15 to DN 1200)
• Pressure Class: 150, 300, 600, 900, 1500, 2500
• Standards Conformance: ANSI/ASME B16.5, ASME B16.47, ISO 7005-1
• Face Type: Raised Face (RF), Flat Face (FF), Ring-Type Joint (RTJ)
• Temperature Range: -20°C to 450°C
• End Connection: Butt Weld
• Certification: ISO 9001:2015, CE, ASME, ASTM, PED

3. Working

Weld Neck Flanges are used to connect piping systems. The flange is welded to the pipe, creating a strong, permanent connection. The neck of the flange provides a smooth transition between the pipe and the flange, reducing turbulence and pressure drops. These flanges are designed to handle high pressure and temperature, making them ideal for critical applications like steam lines, high-pressure gas systems, and petrochemical industries.

4. Principle

The principle behind Weld Neck Flanges is their unique design, which involves a long, tapered neck that is welded directly to the pipe. This design minimizes stress and prevents leaks, ensuring a secure and stable connection. The gradual transition from the pipe to the flange reduces the risk of fatigue or failure under pressure and temperature changes.

5. Assembly Process

1. Preparation of Pipe: Clean the pipe ends and ensure they are properly aligned for welding.
2. Flange Alignment: Place the flange on the pipe, ensuring that the flange face is aligned with the pipe’s centerline.
3. Welding: Perform a full penetration weld around the flange neck to secure it to the pipe. Use proper welding techniques to avoid leaks.
4. Inspection: Inspect the weld to ensure it is smooth and free from defects.
5. Testing: Conduct pressure tests to check for leaks and verify the integrity of the welded connection.

6. Installation Process

1. Preparation: Ensure the pipe ends and flange surfaces are clean and free of contaminants.
2. Positioning: Align the flange with the corresponding pipe. Ensure it is centered and the face of the flange is facing the correct direction for bolting.
3. Bolting: Use appropriate bolts and nuts to attach the flange to the other flange (or equipment). Tighten in a cross-pattern to ensure uniform compression.
4. Inspection: After installation, check the connection for proper alignment and ensure no distortion occurs during tightening.
5. Pressure Testing: Conduct a hydrostatic test to ensure the weld and connection are leak-free.

7. Technical Specifications

8. Troubleshooting

9. HS Codes

• HS Code for Weld Neck Flange:
  • 730721 – Flanges of iron or steel, of a kind used for pipes.

10. Frequently Asked Questions (FAQs)

Q1: What is the main advantage of a Weld Neck Flange over other flanges?
A1: The main advantage of Weld Neck Flanges is the gradual transition between the flange and pipe, which minimizes stress and prevents leakage. This makes them ideal for high-pressure and high-temperature applications.

Q2: Can Weld Neck Flanges be used in offshore applications?
A2: Yes, they are commonly used in offshore applications because of their strength and ability to withstand extreme pressures and corrosive environments.

Q3: Are Weld Neck Flanges reusable?
A3: Yes, as long as the flange is not damaged during disassembly or installation, it can be reused. However, it’s crucial to inspect for any signs of wear or fatigue.

11. Applications

Weld Neck Flanges are used in a wide range of industries where high pressure, high temperature, and critical performance are required:

• • Oil & Gas Industry
  • Chemical Processing Plants
  • Power Generation
  • Marine & Offshore Systems
  • Water Treatment
  • Petrochemical Refineries
  • Food & Beverage (if certified)