ASME B16.47 Series A Class 150 Blind Flange Description

ASME B16.47 Series A Class 150 Blind Flanges are manufactured for large-diameter piping systems requiring a removable and reliable pipeline closure.

Unlike weld neck or slip-on flanges, a blind flange has no central opening. It is bolted directly to a matching flange with a gasket between the sealing faces, creating a secure termination point for pipelines and equipment.

Series A flanges generally feature robust dimensions and heavy-duty construction, making them suitable for large pipeline systems where mechanical strength, dimensional accuracy, and reliable sealing are important.

They can be manufactured from carbon steel, stainless steel, alloy steel, duplex stainless steel, and other special materials according to project specifications.

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

ASME B16.47 Series A Class 150 Blind Flange Dimensions

Unit: Inch

Notes:

All dimensions are in inches.

Standard products are furnished with a 1/16" raised face unless otherwise specified.

Other facing types and customized machining can be supplied according to customer requirements.

Dimension data source: ASME B16.47 Series A Class 150 Blind Flange reference table.

Blind Flange

An ASME B16.47 Series A Class 150 Blind Flange is a solid flange without a center bore. Its primary purpose is to terminate or isolate sections of large-diameter piping systems.

The blind flange is positioned against a matching flange with a suitable gasket and secured using bolts and nuts. This produces a removable closure capable of providing reliable sealing while allowing the piping system to be reopened when inspection, cleaning, expansion, or maintenance is required.

Compared with permanently welded pipe caps, blind flanges provide easier access to the internal pipeline and greater flexibility for future system modifications.

They are particularly suitable for large-diameter pipelines used in oil and gas transmission, petrochemical plants, power generation facilities, water systems, and industrial processing equipment.

Advantages of ASME B16.47 Series A Class 150 Blind Flange

Reliable Pipeline Isolation

The solid, bore-free construction provides complete closure at pipeline ends and equipment connections. When correctly installed with suitable bolts and gaskets, the blind flange provides dependable pipeline isolation.

Strong Mechanical Performance

Forged construction provides excellent mechanical strength and structural integrity for large-diameter industrial piping systems.

Standardized Dimensions

Manufacturing according to ASME B16.47 Series A provides standardized outside diameter, bolt circle, bolt-hole dimensions, flange thickness, and sealing-face dimensions.

This allows reliable compatibility with corresponding ASME piping equipment.

Convenient Maintenance Access

Unlike permanently welded end caps, blind flanges can be removed when pipeline inspection, cleaning, modification, or maintenance is necessary.

Suitable for Large-Diameter Pipelines

ASME B16.47 specifically covers large-diameter steel flanges. Series A Class 150 Blind Flanges are available from NPS 26 through NPS 60 for demanding industrial piping projects.

Multiple Material Options

Blind flanges can be manufactured from carbon steel, stainless steel, alloy steel, duplex stainless steel, and special materials according to operating conditions.

Applications

Oil and Gas Industry

ASME B16.47 Series A Class 150 Blind Flanges are widely used to terminate and isolate large-diameter oil and gas pipelines, processing lines, storage systems, compressor stations, and associated equipment.

Petrochemical Industry

Petrochemical plants use blind flanges on process piping, reactors, tanks, heat exchangers, and maintenance isolation points.

Chemical Processing

Chemical plants require reliable isolation points throughout piping systems. Different material grades can be selected according to the chemical medium and corrosion requirements.

Power Generation

Large-diameter blind flanges are used in cooling water systems, auxiliary piping, circulation systems, and other pipeline connections in power generation facilities.

Water Treatment Systems

Water supply projects, wastewater plants, pumping stations, and industrial water systems use large blind flanges to terminate pipelines and provide removable maintenance access.

Offshore and Marine Engineering

ASME B16.47 Series A Blind Flanges can be used in offshore platforms, marine piping, seawater systems, and other large-diameter pipeline applications where reliable mechanical connections are required.

Why Choose Us

ASME B16.47 Manufacturing Capability

We manufacture large-diameter Blind Flanges according to applicable ASME B16.47 Series A dimensional requirements, including Class 150 products from NPS 26 through NPS 60.

Products can also be manufactured according to other ASME, ANSI, EN, DIN, JIS, AWWA, BS, and international standards.

Comprehensive Production Capabilities

Our production capabilities cover:

Raw Material Inspection → Cutting → Forging → Heat Treatment → CNC Machining → Drilling → Facing → Inspection → Marking → Surface Treatment → Packaging

Integrated production helps maintain consistent dimensional accuracy and product quality throughout the manufacturing process.

Large Size Manufacturing

We have manufacturing capabilities for large-diameter forged flanges used in pipelines, pressure vessels, valves, pumps, and heavy industrial equipment.

Standard and customized flange dimensions can be supplied according to drawings and project specifications.

Multiple Material Options

Available materials include:

Carbon Steel

Stainless Steel

Alloy Steel

Duplex Stainless Steel

Special Material Grades

Material certificates can be supplied according to customer and project requirements.

Quality Assurance

Our ASME B16.47 Series A Class 150 Blind Flanges can undergo:

Dimensional Inspection

Visual Inspection

Chemical Composition Analysis

Mechanical Property Testing

Ultrasonic Testing (UT)

Magnetic Particle Testing (MT)

Positive Material Identification (PMI)

Hardness Testing

Third-Party Inspection

Additional testing and inspection can be provided according to customer specifications.

Customized Manufacturing

Besides standard ASME B16.47 dimensions, customized blind flanges can be manufactured according to drawings or technical specifications.

Customization may include:

Special dimensions

Customized bolt-hole patterns

Different flange facings

Special thickness

Material selection

Coating and surface treatment

Marking

Packaging

Inspection requirements

COMPANY PROFILE

Shanxi HongKai Forging Co., Ltd. is located in Dingxiang County, Shanxi Province, China, an important manufacturing area for forged flanges.

We specialize in the production of forged flanges for industrial piping systems and have comprehensive capabilities covering forging, heat treatment, CNC machining, drilling, physical and chemical testing, surface treatment, marking, packaging, and shipment.

Our flange products can be manufactured according to major international standards including:

ASME B16.5 / ASME B16.47 / EN 1092-1 / DIN / JIS / AWWA and other international standards.

We manufacture carbon steel, stainless steel, alloy steel, duplex stainless steel, and customized forged flanges for customers in oil and gas, petrochemical, power generation, chemical processing, water treatment, marine, machinery, and other industrial sectors.

 

 

 

 

 

 

FAQ

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

A: It is a large-diameter solid flange manufactured according to ASME B16.47 Series A dimensional requirements. It contains no central pipe bore and is used to close, terminate, or isolate piping systems and equipment.

Q: What sizes are available for ASME B16.47 Series A Class 150 Blind Flanges?

A: Standard sizes range from NPS 26" to NPS 60".

Q: What pressure class is this blind flange?

A: This product is manufactured to ASME Class 150 requirements.

Q: What materials are available?

A: Common materials include carbon steel, stainless steel, alloy steel, and duplex stainless steel. Other materials can also be manufactured according to project requirements.

Q: What facing is normally supplied?

A: Raised Face is commonly supplied. The referenced Class 150 dimensional table specifies a 1/16" raised face unless otherwise specified. Other facing configurations can be supplied according to project requirements.

Q: What is the difference between a Blind Flange and a Weld Neck Flange?

A: A Blind Flange has no central opening and is designed to close a piping system. A Weld Neck Flange contains a bore and a tapered hub that is butt welded to the pipe to create a continuous pipeline connection.

Q: What industries use ASME B16.47 Series A Class 150 Blind Flanges?

A: They are widely used in oil and gas, petrochemical, chemical processing, power generation, water treatment, offshore, marine, pressure vessel, and large industrial pipeline systems.

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

A: Yes. Customized dimensions, materials, flange facings, bolt-hole arrangements, thicknesses, coatings, markings, and testing requirements can be manufactured according to drawings or project specifications.

Q: Can you provide inspection and material certificates?

A: Yes. Material certificates, dimensional inspection reports, mechanical test reports, UT, MT, PMI, hardness testing, and third-party inspection can be supplied when required.

Contact Us

Ready to discuss your ASME B16.47 Series A Class 150 Blind Flange requirements?

Contact our technical team for product selection, dimensional confirmation, material recommendations, customized manufacturing, technical support, and quotations.

Shanxi HongKai Forging Co., Ltd.

Email: kevin.zhao@hkflange.com
Telephone: +86 13716747092

Send us your required NPS size, material grade, quantity, flange facing, coating, inspection requirements, and delivery destination for a quotation.