ANSI B16.5 BLACK PAINT WELD NECK FLANGE

Standard Specification
ANSI B16.5 is a widely recognized American National Standard that specifically deals with pipe flanges and flanged fittings. It comprehensively stipulates various technical requirements such as dimensions, pressure ratings, connection types, and materials of flanges. This ensures the universality and interchangeability of flanges in different industrial applications. Flanges produced in accordance with ANSI B16.5 can meet the connection requirements of various piping systems under different pressure, temperature, and medium conditions.
Structural Features
Weld Neck Design
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.
Black Paint Coating
The black paint coating on the surface of the flange serves both protective and decorative purposes. 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. In terms of decoration, the black paint gives the flange a neat and aesthetically pleasing appearance, meeting the requirements of some engineering projects for the appearance of equipment.
Dimensions and Specifications
Nominal Diameter
The nominal diameter of ANSI B16.5 weld neck flanges typically ranges from NPS 1/2 (DN15) to NPS 24 (DN600) or even larger, to meet the connection needs of pipes with different diameters.
Pressure Ratings
It includes different pressure ratings such as Class 150, Class 300, Class 600, Class 900, Class 1500, and Class 2500. The specific pressure rating depends on the actual working conditions and requirements of the piping system.
Application Areas
Petroleum and Chemical Industry
In the petroleum and chemical industry, these flanges are widely used in various piping systems that transport crude oil, refined oil, chemical raw materials, and other media. They can withstand high temperatures and pressures and ensure the tightness of the piping system, preventing leakage of harmful media.
Power Generation Industry
In power plants, whether in thermal power, nuclear power, or other power generation systems, ANSI B16.5 black paint weld neck flanges are used in steam pipelines, water supply and drainage pipelines, and other piping systems. They play an important role in ensuring the safe and stable operation of the power generation equipment.
Shipbuilding Industry
In the shipbuilding industry, these flanges are used in the ship's piping systems, such as the fuel oil system, cooling water system, and compressed air system. The black paint coating can resist the erosion of seawater and marine atmosphere, ensuring the reliability of the ship's piping system.