Ti Gr2 Gr5 Titanium ASME B16.5 Weld Neck Flanges WNRF Class 150 Raised Face for Pipelines

ASME B16.5 Class 150 Gr1, Gr2 Pipe Raised Face WNRF Weld Neck Flanges for Piping Systems

In modern piping systems, the quality and performance of flanges and flanged fittings play a vital role in ensuring the integrity and longevity of the entire system. One of the most commonly used standards for these components is ASME B16.5, which defines the specifications for pipe flanges and flanged fittings. This standard is essential for engineers, manufacturers, and project planners to understand and implement, as it ensures compatibility and safety across a variety of industrial applications. In this article, we will delve into Gr1 and Gr2 titanium flanges, focusing on Raised Face Weld Neck Flanges (RFWN) with a Class 150 pressure rating.

1. Overview of ASME B16.5 Standard

ASME B16.5 outlines the design, dimensions, materials, and testing requirements for pipe flanges and flanged fittings. The standard primarily addresses flanges with 1/2" to 24" nominal pipe sizes and covers a wide range of pressure classes, including Class 150, which is one of the most common ratings for low-pressure applications.

2. Material Specifications: Gr1 and Gr2 Titanium

The two materials specified under this standard for high-performance piping systems are Grade 1 and Grade 2 titanium alloys. Titanium is favored for its exceptional strength-to-weight ratio, corrosion resistance, and high-temperature tolerance, making it ideal for demanding environments such as marine and chemical industries.

Grade 1 Titanium (Commercially Pure Titanium)

• Corrosion Resistance: Excellent, especially in neutral or slightly corrosive environments.
• Weldability: Easily weldable with standard techniques.
• Strength: Lower than Grade 2 but still offers excellent performance in most applications.

Grade 2 Titanium

• Corrosion Resistance: Superior resistance to corrosion, especially in seawater and acidic environments.
• Strength: Stronger than Grade 1, providing higher performance in stress-intensive applications.
• Applications: Ideal for chemical processing, desalination, and other aggressive environments.

3. Raised Face Weld Neck Flanges (WNRF)

The Raised Face Weld Neck Flanges (RFWN) are widely used in piping systems due to their excellent sealing performance and high strength. The design of the raised face creates an optimal sealing surface when paired with a gasket. This is particularly important in applications where the flange must withstand high pressures or where leakage could result in system failure.

• Key Features of RFWN Flanges:
  • Raised Face: A small area raised above the flange’s body that allows for better sealing with gaskets.
  • Weld Neck: A long neck that gradually transitions from the flange to the pipe, providing a robust connection and enhancing the overall strength of the joint.

Class 150 Pressure Rating

Class 150 flanges are designed for low-pressure applications, with a maximum pressure rating of 150 psi. They are commonly used in systems where the pressure is relatively low, and the focus is on reliability and leak prevention.

4. Dimensions of Class 150 Raised Face Weld Neck Flanges (RFWN)

Below is a table that outlines the dimensions for Class 150 Raised Face Weld Neck Flanges as specified by ASME B16.5:

5. Manufacturing Process for Titanium Flanges

Titanium flanges, especially Gr1 and Gr2 alloys, undergo several critical manufacturing steps to ensure their quality and reliability. The process includes:

• Material Selection: Choosing the appropriate titanium grade (Gr1 or Gr2) based on the application.
• Forming: The titanium billets are heated and formed into flange shapes using forging or casting techniques.
• Machining: Precision machining is done to ensure accurate dimensions, including the raised face and bolt holes.
• Heat Treatment: Both Grade 1 and Grade 2 titanium alloys undergo heat treatment processes to enhance their mechanical properties.
• Surface Finishing: The flanges are polished to ensure a smooth finish, especially on the raised face, to improve sealing performance.
• Inspection and Testing: Every flange is subjected to rigorous quality control, including visual inspection, dimensional checks, and non-destructive testing to ensure no internal defects.

6. Applications of Gr1 and Gr2 Titanium Flanges

Titanium flanges are used in a wide variety of industries, including:

• Marine Industry: For applications where corrosion resistance in seawater is critical.
• Chemical Processing: For pipelines handling aggressive chemicals and acids.
• Aerospace: In environments where high strength-to-weight ratios are required.
• Power Plants: For high-temperature and high-pressure applications.

Conclusion:

ASME B16.5 Gr1 and Gr2 titanium pipe flanges, specifically Raised Face Weld Neck Flanges (RFWN) with a Class 150 pressure rating, offer an ideal solution for low-pressure piping systems where reliability, corrosion resistance, and strength are essential. The materials, design features, and manufacturing processes ensure that these flanges provide a long-lasting, high-performance connection in challenging environments.

By adhering to ASME B16.5 standards, engineers and manufacturers can ensure that their systems meet the required performance criteria while maintaining safety and durability across a variety of industrial applications.

Baoji Lihua Nonferrous Metals Co., Ltd.