ASME/ANSI FLANGES

Our flanges are designed according to the ASME/ANSI B16.5, B16.47 series A and B standard, which covers different dimensions, tolerances, materials, pressure-temperature ratings, and testing requirements for pipe flanges and flanged fittings within a certain size range and pressure class.

ASME B16.5 Flange

What is ASME B16.5 Flange?

ASME B16.5 is a critical standard that specifies requirements for pipe flanges and flanged fittings. It covers sizes from NPS 1/2 through NPS 24 for pressure classes 150 to 1500, and up to NPS 12 for class 2500. The standard details pressure-temperature ratings, material specifications, dimensions, tolerances, and marking requirements. It applies to components made from cast or forged materials and includes specifications for various flange types like slip-on, threaded, and weld neck flanges. This standardization ensures consistency across industries, facilitates proper component selection, and maintains safety in piping systems.

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ASME b16.5 Flange Dimensions

Choose Your Flange Pressure Class Below

ASME b16.5 Slip On Flange Dimensions - Pressure Class 150 to 1500

ASME b16.5 Weld Neck Flange Dimensions - Pressure Class 150 to 2500

ASME b16.5 Socket Weld Flange Dimensions - Pressure Class 150 to 900

ASME b16.5 Threaded Flange Dimensions - Pressure Class 150 to 300

ASME b16.5 Lap Joint Flange Dimensions - Pressure Class 150 to 600

ASME b16.5 Blind Flange Dimensions - Pressure Class 150 to 2500

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stainless steel flange

Pressure: 

PN6, 10, 16, 25, 40

Class150, 300, 600, 900, 1500

Material:

Carbon Steel, Stainless Steel, Aluminum, Nickel Alloys

weld neck flange

Pressure: 

PN10, 16, 25, 40, 63, 100, 160

Class150, 300, 600, 900, 1500, 2500

Material:

Carbon Steel, Stainless Steel, Aluminum, Nickel Alloys

plate flange

Pressure: 

PN2.5, 6, 10, 16, 25, 40

Class150, 300, 600, 900, 1500, 2500

Material:

Carbon Steel, Stainless Steel, Aluminum, Nickel Alloys

blind flange

Pressure: 

PN2.5, 6, 10, 16, 25, 40, 63, 100, 160

Class150, 300, 600, 900, 1500, 2500

Material:

Carbon Steel, Stainless Steel, Aluminum, Nickel Alloys

socket welded flange

Pressure: 

PN10, 16, 25, 40, 63, 100

Class150, 300, 600, 900

Material:

Carbon Steel, Stainless Steel, Aluminum, Nickel Alloys

Lap Joint Flanges

Pressure: 

PN6, 10, 16, 25, 40

Class150, 300, 600

Material:

Carbon Steel, Stainless Steel, Aluminum, Nickel Alloys

threaded flanges

Pressure: 

PN6, 10, 16, 25, 40

Class150, 300

Material:

Carbon Steel, Stainless Steel, Aluminum, Nickel Alloys

custom flange

Our custom flanges are made to specific sizes and materials for unique applications. Can be modified from standard designs or created from scratch to meet various industry requirements.

Pressure Ratings

ASME B16.5 flanges are classified into pressure classes (150#, 300#, 600#, 900#, 1500#, 2500#) with corresponding temperature ratings. This ASME B16.5 standard defines maximum allowable working pressures at various temperatures for different flange materials.

Material Class

ASME B16.5 groups flange materials into categories (such as Group 1.1, 1.2, etc.) based on their chemical composition and mechanical properties. This standardization ensures proper material selection for specific operating conditions.

Dimensional Standards

The ASME B16.5 specification provides precise dimensional requirements for flange face-to-face length, thickness, bolt hole size and positioning, raised face height, and overall diameter, ensuring universal interchangeability.

Flange Face Types

ASME B16.5 flanges feature various face types including raised face (RF), flat face (FF), ring-type joint (RTJ), and large/small tongue-and-groove, accommodating different sealing requirements and applications.

Size Range Coverage

ASME B16.5 standard covers flange sizes from NPS 1/2 through NPS 24 inches, making it the most widely used specification for small to medium-sized pipe flanges in industrial applications.

Surface Finishing

ASME B16.5 specifies surface finish requirements for different flange faces, particularly for raised face flanges, ensuring proper gasket seating and leak-tight connections under various service conditions.

Compliance Certificates

Why Choose LONGAN Flange?

LONGAN FLANGE
  • Expertise in Flange Manufacturing: Longan Flange specializes in producing a wide range of flanges and custom non-standard products, ensuring we meet diverse industry needs with precision.
  •  
  • Advanced Manufacturing Capabilities: With over 100 CNC lathes, 10 machining lathes, and 16 high-precision machining centers, we leverage advanced technology for efficient and high-quality production.
  •  
  • Rigorous Quality Assurance: Our independent laboratory equipped with 15 testing devices ensures extensive testing of each flange, guaranteeing they meet specifications and providing reliable performance.
  •  
  • Commitment to Customization and Standards: We offer tailor-made solutions while adhering to established industry standards, ensuring seamless compatibility and exceptional quality tailored to your project requirements.

Frequently Asked Questions (FAQs)

The most common types of ASME flanges include slip-on flanges, weld neck flanges, socket weld flanges, blind flanges, lap joint flanges, and threaded flanges. Each type has specific applications and installation methods.

ASME B16.5 is a standard that specifies requirements for pipe flanges and flanged fittings, covering sizes from NPS ½” to 24” and pressure classes from 150 to 2500. It details dimensions, materials, pressure-temperature ratings, and testing requirements.

When selecting an ASME flange, consider factors such as material compatibility, pressure-temperature ratings, flange type (e.g., slip-on or weld neck), and the specific requirements of your piping system.

ASME flanges are typically made from materials such as carbon steel, stainless steel, and alloy steel. The choice of material depends on the application and environmental conditions

The pressure class rating indicates the maximum allowable pressure for a flange at a given temperature. Common classes include 150, 300, 600, 900, 1500, and 2500

While ASME flanges are designed to meet specific standards, they may not be directly interchangeable with other types like ASTM flanges without verifying that they meet necessary dimensional and pressure ratings

Flange facing types (such as raised face or flat face) affect how well the flange seals with gaskets and impacts its performance in high-pressure applications

ASME flanges undergo various tests to ensure they meet safety and performance standards, including pressure testing, material verification, and dimensional checks

ASME flanges are widely used in industries such as oil and gas, chemical processing, power generation, water treatment, food processing, and marine applications due to their reliability and adherence to safety standards

ANSI (American National Standards Institute) focuses on establishing engineering standards while ASME (American Society of Mechanical Engineers) focuses on mechanical device standards. Both organizations work together to ensure universal engineering standards; however, ASME standards often include more detailed specifications related to pressure ratings and design criteria

Get In touch

Address

620 Kongo Mingzhu Road, Yongxing Street, Longwan District, Wenzhou City, Zhejiang Province, China.

Phone

+86-15727821389
+86-15858538689

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