ASME B16.47 Series A Class 150 Welding Neck Flanges Descriptions

ASME B16.47 Series A Class 150 Welding Neck Flanges are large-diameter pipeline connection components manufactured according to ASME B16.47 Series A dimensional requirements.

Their outside diameter, bolt circle, bolt-hole arrangement, flange thickness, raised face, hub dimensions and other critical dimensions are standardized to provide reliable compatibility with large-diameter pipes, valves, pumps and industrial equipment.

The Welding Neck design incorporates a long tapered hub and butt-weld end. This configuration provides a smooth transition between the pipe and flange, helping reduce localized stress concentration and improve the overall strength of the piping connection.

Depending on operating temperature, pressure, medium and corrosion requirements, these flanges can be manufactured from carbon steel, stainless steel, alloy steel and duplex stainless steel.

Here is a detailed feature and performance table for ASME B16.47 Series A Class 150 Welding Neck Flanges:

ASME B16.47 Series A Class 150 Welding Neck Flange

The ASME B16.47 Series A Class 150 Welding Neck Flange is characterized by its long tapered hub, which extends gradually from the flange body toward the pipe connection.

The pipe is connected to the flange through a butt weld, creating a strong and continuous joint. The tapered hub helps distribute pressure, thermal stress and mechanical loading over a larger area, reducing stress concentration at the flange-to-pipe connection.

This design makes it especially suitable for:

• Large-diameter pipelines
• Oil and gas transmission systems
• Pipelines with pressure fluctuations
• Systems with temperature variations
• Pipelines subject to vibration
• Heavy-duty industrial installations
• Critical process piping systems

The flange bore can be machined according to the required pipe wall thickness or customer specifications.

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Class 150 Dimensions | ASME B16.47 Series A Welding Neck Flange

Class 150 dimensions | ASME B16.47 Series A Flange

Note: Dimensions are shown in inches. Bore dimensions can be manufactured according to pipe wall thickness and purchaser requirements. Final dimensions should be confirmed according to the applicable ASME B16.47 edition and project specification before production.

ASME B16.47 FLANGE CLASSES

Choose The pressure class below

ASME B16.47 Series A

ASME B16.47 Series B

Advantages of ASME B16.47 Series A Class 150 Welding Neck Flanges

Excellent Structural Strength

The long tapered hub gradually transfers mechanical stress from the flange body to the connected pipe. This helps reduce localized stress concentration and provides a strong flange connection for large-diameter piping systems.

Reliable Sealing Performance

Precision-machined flange faces provide consistent gasket contact and compression. Correct flange alignment and standardized bolting arrangements help achieve dependable sealing performance.

Designed for Large-Diameter Pipelines

ASME B16.47 is specifically intended for large-diameter steel pipe flanges. Series A Class 150 Welding Neck Flanges are therefore well suited for major pipeline, process and infrastructure applications.

Strong Butt-Weld Connection

The flange is connected directly to the pipe through a butt weld, providing excellent structural continuity and minimizing abrupt changes in the piping connection.

Resistance to Vibration and Mechanical Loads

The tapered hub design makes Welding Neck Flanges suitable for piping systems exposed to vibration, bending loads, pressure changes and thermal expansion.

Multiple Material Options

ASME B16.47 Series A Flanges can be manufactured from carbon steel, stainless steel, alloy steel and duplex stainless steel according to corrosion, pressure, temperature and mechanical-property requirements.

Applications

Oil and Gas Industry

ASME B16.47 Series A Class 150 Welding Neck Flanges are widely used in large-diameter oil and natural gas transmission pipelines, gathering systems, compressor stations, processing facilities and pipeline terminals.

Petrochemical Industry

They are suitable for process piping, pumps, valves, heat exchangers, storage systems and large-diameter equipment connections in petrochemical facilities.

Chemical Processing

Stainless steel, alloy steel and duplex stainless steel flanges can be selected for pipelines transporting chemicals, corrosive media and industrial process fluids.

Power Generation

Welding Neck Flanges are used in cooling water, process water, utility and auxiliary piping systems in thermal power plants and other power generation facilities.

Water Transmission Systems

Large-diameter Class 150 flanges are suitable for industrial water pipelines, pumping stations, water treatment plants and large water transmission systems.

Refinery Systems

They are commonly applied in refinery process lines, utility piping, storage facilities, valves, pumps and other large pipeline connections.

Marine and Offshore Engineering

Corrosion-resistant materials can be supplied for offshore platforms, terminals, marine piping and seawater systems.

Industrial Manufacturing

ASME B16.47 Welding Neck Flanges are also used in mining, steel plants, energy infrastructure, pressure equipment and other heavy industrial piping systems.

Why Choose Us

ASME B16.47 Manufacturing Capability

We manufacture large-diameter Welding Neck Flanges according to applicable ASME B16.47 Series A dimensional requirements and customer project specifications.

Our products can also be manufactured according to ASME B16.5, EN 1092-1, DIN, JIS, AWWA, BS and other international standards.

Comprehensive Production Capabilities

Our integrated manufacturing facilities cover:

Raw Material Inspection → Cutting → Forging → Heat Treatment → Rough Machining → CNC Precision Machining → Drilling → Inspection → Surface Treatment → Marking → Packing.

This allows quality control throughout the complete manufacturing process.

Large Diameter Manufacturing Capability

We can manufacture ASME B16.47 Series A Class 150 Welding Neck Flanges from NPS 26 to NPS 60, as well as customized large-diameter forged flanges according to drawings and engineering specifications.

Multiple Material Options

Available materials include:

Carbon Steel

• ASTM A105
• ASTM A350 LF2
• ASTM A694 F42
• ASTM A694 F52
• ASTM A694 F60
• ASTM A694 F65
• ASTM A694 F70

Stainless Steel

• ASTM A182 F304 / F304L
• ASTM A182 F316 / F316L
• ASTM A182 F321
• ASTM A182 F347

Alloy Steel

• ASTM A182 alloy steel grades according to project requirements

Duplex Stainless Steel

• Duplex and Super Duplex grades according to customer requirements

Precision CNC Machining

CNC machining equipment helps ensure accurate control of:

• Outside Diameter
• Inside Diameter / Bore
• Bolt Circle Diameter
• Bolt Hole Diameter
• Flange Thickness
• Hub Diameter
• Hub Length
• Raised Face
• Welding Bevel

Quality Assurance

Our ASME B16.47 Series A Welding Neck Flanges undergo dimensional and visual inspection during production.

Additional testing can include:

• Chemical Composition Analysis
• Mechanical Property Testing
• Hardness Testing
• Ultrasonic Testing (UT)
• Magnetic Particle Testing (MT)
• Positive Material Identification (PMI)
• Material Traceability
• Third-Party Inspection

SGS, BV, TÜV and other third-party inspections can be arranged according to project requirements.

Customized Manufacturing

Customized production is available according to drawings and technical specifications, including:

• Customized Bore
• Pipe Schedule
• Flange Thickness
• Hub Dimensions
• Facing Type
• Material Grade
• Surface Treatment
• Marking
• Testing Requirements

International Supply Experience

We have experience supplying forged flanges to international industrial markets and understand different requirements for dimensional standards, material certificates, inspection documentation, packaging and project specifications.

COMPANY PROFILE

Shanxi HongKai Forging Co., Ltd. is located in Dingxiang County, Shanxi Province, China, known as one of China's important manufacturing bases for forged flanges.

The company has extensive experience in the flange and forging industry and has integrated production capabilities covering forging, heat treatment, machining, drilling, physical and chemical testing, surface treatment, inspection, packaging and shipment.

We manufacture forged flanges for oil and gas, petrochemical, chemical processing, power generation, water treatment, shipbuilding, marine engineering and general industrial piping systems.

Our flange products can be manufactured according to:

• ASME B16.5
• ASME B16.47 Series A / Series B
• EN 1092-1
• DIN Standards
• JIS Standards
• AWWA Standards
• BS Standards
• Other International Standards
• Customer Drawings and Technical Specifications

With complete production equipment, experienced manufacturing personnel and quality inspection capabilities, we provide standard and customized forged flange solutions for customers worldwide.

 

 

 

 

 

 

FAQ

Q: What is an ASME B16.47 Series A Class 150 Welding Neck Flange?

A: It is a large-diameter Welding Neck pipe flange manufactured according to ASME B16.47 Series A dimensional requirements and designed for Class 150 piping systems.

Q: What size range is available?

A: ASME B16.47 Series A Class 150 Welding Neck Flanges are commonly available from NPS 26 to NPS 60.

Q: What materials are available?

A: Common materials include carbon steel, stainless steel, alloy steel and duplex stainless steel. Material grades can be selected according to operating temperature, pressure, corrosion conditions and customer specifications.

Q: What is the difference between ASME B16.47 Series A and Series B?

A: Series A and Series B use different flange dimensions, bolt circles, bolt-hole arrangements and flange weights. Series A flanges generally have larger and heavier dimensional configurations. The correct series should be selected according to the piping specification and mating flange requirements.

Q: What flange facing is available?

A: Raised Face (RF) is commonly used for Class 150 Welding Neck Flanges. Other facing configurations can be supplied where required by the applicable standard or project specification.

Q: Can the flange bore be customized?

A: Yes. The flange bore can be machined according to pipe size, wall thickness, pipe schedule and customer drawings.

Q: Can ASME B16.47 Series A Welding Neck Flanges be customized?

A: Yes. We can manufacture customized flange dimensions, bores, hub dimensions, material grades, surface treatments, markings and testing requirements according to drawings and technical specifications.

Q: What inspections can you provide?

A: Dimensional inspection, visual inspection, chemical analysis, mechanical testing, hardness testing, UT, MT, PMI and third-party inspection can be provided according to customer requirements.

Q: What documents can be supplied?

A: Material Test Certificates, dimensional inspection reports, chemical and mechanical test reports, NDT reports and other project quality documents can be supplied when required.

Q: Where are ASME B16.47 Series A Class 150 Welding Neck Flanges used?

A: They are widely used in oil and gas pipelines, petrochemical plants, refineries, chemical processing, power generation, water transmission, offshore engineering and other large-diameter industrial piping systems.

Contact Us

Ready to discuss your ASME B16.47 Series A Class 150 Welding Neck Flanges requirements?

Contact our technical team at kevin.zhao@hkflange.com for technical support, dimensional confirmation, customized manufacturing and competitive quotations.

Fast Response

Clear Communication and Reliable Technical Support

Please send us your:

• Flange Size
• Standard
• Pressure Class
• Material Grade
• Facing Type
• Pipe Schedule / Bore
• Quantity
• Technical Drawing

to receive a detailed quotation.

Shanxi Hongkai Forging Co., Ltd.

Address: Cuijiazhuang Industrial Park, Dingxiang County, Shanxi Province, China
Telephone: +86 13716747092
Email: kevin.zhao@hkflange.com
WhatsApp: +86 13716747092