ANSI B16.5 CLEAR LACQUER WELD NECK FLANGE

Standard Specification
ANSI B16.5 is a crucial American standard that focuses on pipe flanges and flanged fittings. It sets out detailed technical requirements regarding dimensions, pressure ratings, connection types, and materials for flanges. This ensures that flanges produced to this standard are widely applicable and interchangeable in a variety of industrial piping systems, meeting different operational demands in terms of pressure, temperature, and medium.
Structural Features
Weld Neck Design
The weld neck flange is characterized by a long, tapered neck section that is designed for welding to the pipe. This design offers excellent strength and stability, enabling the flange to withstand high levels of pressure and stress.
It provides a reliable and tight seal, making it suitable for use in high-pressure, high-temperature piping systems where leak prevention is of utmost importance. The tapered shape of the neck allows for a smooth transition when welded to the pipe, reducing stress concentration points and enhancing the overall integrity of the connection.
Clear Lacquer Coating
The clear lacquer finish on the flange serves multiple purposes. Firstly, it acts as a protective layer, shielding the flange surface from environmental factors such as moisture, oxidation, and chemical corrosion. This helps to prolong the service life of the flange and maintain its performance over time.
Secondly, the clear lacquer provides a smooth and glossy surface, which not only enhances the aesthetic appeal of the flange but also makes it easier to clean and maintain. It allows for easy inspection of the flange surface for any signs of damage or wear.
Dimensions and Specifications
Nominal Diameter
ANSI B16.5 clear lacquer weld neck flanges are available in a wide range of nominal diameters, typically from NPS 1/2 (DN15) to NPS 24 (DN600) or even larger, to accommodate different pipe sizes and flow requirements.
Pressure Ratings
These flanges are designed to handle various pressure ratings, including Class 150, Class 300, Class 600, Class 900, Class 1500, and Class 2500. The specific pressure rating depends on the intended application and the operating conditions of the piping system.
Application Areas
Pharmaceutical Industry
In pharmaceutical manufacturing plants, where strict hygiene and cleanliness standards are required, the clear lacquer finish helps to prevent contamination and is easy to sanitize. The weld neck flange's reliable sealing and high strength ensure the integrity of piping systems used for transporting pharmaceutical fluids and gases.
HVAC Systems
In heating, ventilation, and air conditioning systems, these flanges are used in piping systems for transporting refrigerant gases, hot and cold water, and air. The clear lacquer protects the flange from rust and corrosion in the often humid and temperature-variable environment of HVAC systems, while the weld neck design provides a secure connection to maintain proper fluid and air flow.
General Industrial Applications
In various other industrial settings, such as manufacturing plants, refineries, and power generation facilities, ANSI B16.5 clear lacquer weld neck flanges are used in a wide range of piping systems. They offer the necessary strength, sealing performance, and protection against the elements, making them a reliable choice for connecting pipes and ensuring the efficient operation of the overall system.