ANSI pipe flange standard

ANSI Pipe flange standard refers to the flange connection standard established by the American National Standards Organization (ANSI). Flange connection is a commonly used connection method used to connect two pipes, valves or equipment together. The ANSI flange standard defines the size, shape, material and connection method of the flange to ensure the safety and reliability of the connection.

Standard classification:
The ANSI pipe flange standard is divided into the following categories according to different needs and application scenarios:

1. ANSI B16.5

ANSI B16.5 is one of the most commonly used ANSI flange standards and is applicable to flange connections of pipes, valves and accessories. It specifies the size range of flanges, the shape and processing requirements of the connection surface, and the selection of materials. This is one of the standards commonly used by many chemical equipment manufacturers and engineering projects in the United States and other regions.

2. ANSI B16.47
ANSI B16.47 standard is mainly used for flange connections of large-diameter pipes. It defines the design and manufacturing requirements for large-size flanges, including the arrangement of bolt holes, the shape and size of the flange surface, and the selection of sealing gaskets.

3. ANSI B16.36
ANSI B16.36 standard applies to welded neck flanges. Neck flange is a common flange connection method, which is usually used in high pressure and high temperature environments. This standard specifies the shape, size and material requirements of neck flanges to ensure the sealing and reliability of the connection.

Other flange standards:

EN 1092: Flange standard issued by the European Organization for Standardization, applicable to the European market for flanges and flange connections.
DIN standard: Flange standard issued by the German Standardization Association, one of the commonly used flange standards in Europe and other regions.
GB/T standard: Flange standard issued by the China National Standardization Administration, applicable to flange products in the Chinese market.
JIS standard: Flange standard issued by the Japan Industrial Standards Organization, applicable to flange products in the Japanese market.
API standard: Flange standard issued by the American Petroleum Institute, applicable to flange connections in the oil and gas industry.

Construction of flange connection:

Flange connection usually consists of two flanges, bolts and flange gaskets. The bolts on the flange clamp the two flanges together, and the gasket is used to fill the gap between the flange surfaces to ensure the sealing of the connection.

Flange:
Flange is an important component for connecting pipes, valves or equipment. It is made of metal and has a fixed size and shape. According to the requirements of the American standard flange standard, the inner diameter, outer diameter, aperture and face shape of the flange are strictly limited.

Bolt:
Bolts are used to connect two flanges. According to the standard requirements, the specifications of the bolts must match the aperture of the flange to ensure the stability and safety of the connection. Bolts are usually made of carbon steel or stainless steel and have certain strength and corrosion resistance.

Gasket:
Gaskets are placed between the flange surfaces to fill the gap of the flange. It can play the role of sealing and compensating for uneven surfaces to ensure the sealing of the connection. Depending on different application scenarios, flange gaskets can choose different materials, such as asbestos, rubber or metal.

Advantages of ANSI pipe flanges:

The ANSI pipe flange standard has the following advantages:

1. Standard uniformity
The ANSI flange standard is formulated by ANSI and has wide applicability and substitutability. Different manufacturers and suppliers can design, manufacture and use according to the same standard, which improves interchangeability and reliability.

2. Wide range of sizes
The ANSI flange standard specifies flanges of various sizes, which can meet the connection requirements of different pipelines and equipment, and suitable flanges can be found from small pipelines to large projects.

3. Reliable structure
The connection structure of the ANSI flange is simple and reliable, and can withstand high pressure and high temperature
Working in an environment. Its material and processing requirements are strict, ensuring the safety and stability of the connection.

4. Easy to install and maintain
The ANSI flange connection is relatively simple, and the tightening and loosening of the bolts are relatively easy. If replacement or repair is required, just remove the bolts, which will not cause much impact on the entire pipeline system.

Conclusion:

The ANSI pipe flange standard is an important standard for connecting pipes, valves and equipment. It specifies the size, shape, material and connection method of flanges. According to different application scenarios, the ANSI flange standard is divided into different categories such as ANSI B16.5, ANSI B16.47 and ANSI B16.36. The advantages of the ANSI flange standard include unified standards, a wide range of sizes, reliable structures, and easy installation and maintenance. In the process of engineering design and manufacturing, the reasonable selection and use of the ANSI flange standard will be able to improve the safety and reliability of the connection.

Read more: Pipe flange size specifications or Pipe flange materials