ANSI B16.5 YELLOW PAINT WELD NECK FLANGE

The weld neck flange has a long tapered neck that is welded to the pipe. This design provides several advantages. Firstly, the welding joint has high strength and can withstand high pressure and stress. Secondly, it offers excellent sealing performance, making it suitable for use in piping systems with strict requirements for high temperature, high pressure, and tight sealing. The tapered neck of the weld neck flange allows for a smooth transition when welded to the pipe, effectively reducing stress concentration. From a protective perspective, the paint layer acts as a barrier to isolate the flange surface from air, moisture, and other corrosive media, preventing rust and corrosion and thus prolonging the service life of the flange.

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Standard Specification
ANSI B16.5 is a well-recognized American standard that pertains to pipe flanges and flanged fittings. It comprehensively defines technical requirements such as dimensions, pressure ratings, connection types, and materials for flanges, ensuring their universality and interchangeability in diverse industrial applications.
Structural Features
Weld Neck Design
The weld neck of the flange is designed to be welded to the pipe. This design offers a high-strength connection that can endure high pressures and stresses.
It provides excellent sealing performance, making it suitable for high-temperature, high-pressure piping systems with strict sealing requirements.
The tapered shape of the weld neck enables a smooth transition when joined to the pipe, effectively minimizing stress concentration.
Yellow Paint Coating
The yellow paint on the flange surface serves both protective and decorative purposes.
Protectively, it acts as a barrier against air, moisture, and corrosive media, safeguarding the flange from rust and corrosion and prolonging its service life.
Dimensions and Specifications
Nominal Diameter
Typically, the nominal diameter of ANSI B16.5 yellow paint weld neck flanges ranges from NPS 1/2 (DN15) to NPS 24 (DN600) or even larger.
Pressure Ratings
It encompasses pressure ratings like Class 150, Class 300, Class 600, Class 900, Class 1500, and Class 2500.
Application Areas
Chemical Industry
In chemical plants, these flanges are used in pipelines transporting various chemical substances. The yellow paint coating can resist chemical corrosion to a certain extent, and the weld neck design ensures a reliable connection to prevent leaks of hazardous chemicals.
Water Treatment Facilities
In water treatment plants, they are employed in water supply and drainage pipelines. The yellow paint can enhance visibility for easy inspection and maintenance, and the weld neck flange can withstand the pressure and water erosion in the piping system.