ANSI/ASME Flange

Name: ANSI/ASME Flange
Brand: Cangzhou Silver Valley technology Co., LTD

ASME (American Society of Mechanical Engineers) standards are widely used in the design, manufacturing, and testing of flanges for various industries, including oil and gas, chemical, and power generation.

What is ASME Flange

ASME flange refers to a flange product manufactured in accordance with the standards of the American Society of Mechanical Engineers (ASME).

Connection Function: It is a part used to connect pipes to each other, being attached to the pipe ends. There are holes on the ASME flange, and bolts are used to tightly connect two flanges with a gasket in between for sealing. In this way, two pipelines, pipe fittings or equipment can be connected together.

Structural Forms: Common types include weld neck flange, slip on flange, plate weld flange, socket weld flange, threaded flange and blind flange.

Types of ASME Flange

Standard	Flange Type	Description	Applications
ASME B16.5	Weld Neck Flange (WN)	Long tapered hub, suitable for high-pressure applications, provides reinforcement.	High-pressure piping systems, such as oil, gas, and chemical industries.
	Slip-On Flange (SO)	Easy to align and install, slides over the pipe and is welded inside and outside.	Medium to low-pressure piping systems.
	Socket Weld Flange (SW)	Welded only on the outside, suitable for small-diameter pipes.	Small-diameter, low-pressure piping systems.
	Threaded Flange (TH)	Internal threads, suitable for low-pressure, non-critical applications.	Low-pressure, non-corrosive fluid pipelines.
	Blind Flange (BL)	Used to close the end of a pipeline or vessel opening.	Pipeline end closure or isolation.
	Lap Joint Flange (LJ)	Used with stub ends, allows for easy alignment and rotation.	Piping systems requiring frequent disassembly.
	Orifice Flange	Used for flow measurement, with orifice plate accommodation.	Liquid or gas flow measurement.
ASME B16.47	Large Diameter Flange (Series A)	Thicker and stronger, suitable for demanding applications.	Large-diameter, high-pressure piping systems.
ASME B16.47	Large Diameter Flange (Series B)	Lighter and more economical, suitable for less critical applications.	Large-diameter, low-pressure piping systems.
ASME B16.36	Orifice Flange	Specifically designed for use with orifice meters to measure flow rates.	Flow measurement systems.
ASME B16.1	Cast Iron Flange (Class 125)	Suitable for low-pressure applications.	Low-pressure water treatment or non-corrosive fluid pipelines.
ASME B16.1	Cast Iron Flange (Class 250)	Suitable for higher-pressure applications.	Medium to low-pressure piping systems.
ASME B16.24	Cast Copper Alloy Flange	Used in copper alloy piping systems.	Copper alloy pipelines, such as refrigeration or water supply systems.
ASME B16.42	Ductile Iron Flange (Class 150)	Suitable for low-pressure applications.	Low-pressure water treatment or non-corrosive fluid pipelines.
ASME B16.42	Ductile Iron Flange (Class 300)	Suitable for higher-pressure applications.	Medium to low-pressure piping systems.
ASME B16.48	Line Blank	Used to isolate sections of a pipeline.	Pipeline isolation or maintenance.
ASME B16.21	Nonmetallic Flat Gasket	Used with flanges to ensure a tight seal.	Low-pressure, non-corrosive fluid pipelines.
ASME B16.20	Ring Joint Gasket (RTJ)	Used in high-pressure and high-temperature applications.	High-pressure, high-temperature piping systems, such as oil and gas industries.
ASME B16.20	Spiral Wound Gasket	Provides a reliable seal, suitable for various applications.	Medium to high-pressure piping systems.
ASME B16.10	Valve Face-to-Face Dimensions	Specifies dimensions for valve-to-flange connections.	Valve installation and connection.

Standards and Specifications of ASME Flange

Main Standards: The standards governing ASME flanges are mainly ASME B16.5 and ASME B16.47. ASME B16.5 is applicable to pipe flanges and flange fittings with nominal diameters ranging from NPS 1/2 to NPS 24; ASME B16.47 is for large-diameter steel pipe flanges with nominal diameters from NPS 26 to NPS 60.

Pressure Rating: ASME flanges are classified into different pressure classes, namely Class 75, 150, 300, 600, 900, 1500 and 2500. The pressure rating indicates the relative pressure-bearing capacity of the flange at the reference temperature. For example, a Class 150LB flange can withstand approximately 20 bar at room temperature (38°C), but the pressure resistance drops to about 13 bar at 200°C.

Flange Face Types: ASME B16.5 and ASME B16.47 specify several types of flange faces, such as flat face (FF), raised face (RF), ring joint (RTJ), lap joint, male and female (M&F), and tongue and groove (T&G).

Materials of ASME Flange

Carbon Steel ASME flange: Such as ASTM A105, 20#, Q235, 16Mn, Q345b, ASTM A350 LF1, LF2 CL1/CL2, LF3 CL1/CL2, ASTM A694 F42, F46, F48, F50, F52, F56, F60, F65, F70.

Stainless Steel ASME flange: Such as ASTM A182 F304, 304L, F316, 316L, 1Cr18Ni9Ti, 0Cr18Ni9Ti, 321, 18-8.

Alloy Steel ASME flange: Such as ASTM A182 F1, F5a, F9, F11, F12, F22, F91, A182F12, A182F11, 16MnR, Cr5Mo, 12Cr1MoV, 15CrMo, 12Cr2Mo1, A335P22, St45.8/Ⅲ.

Applications of ASME Flange

ASME flanges are widely used in many industries:

Petrochemical Industry: In oil refineries and petrochemical plants, they are used to connect pipelines transporting oil, gas and various chemical media.

Power Industry: Such as in nuclear power plants and thermal power plants, they are used in pipelines of steam, water and other media.

Water Treatment Industry: In water supply and drainage systems, they play a role in connecting water pipelines and related equipment.

Food Processing Industry: They are used in pipelines transporting food-grade media to ensure the safety and hygiene of the connection.

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