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ASME B16.47 Series B Class 300 Blind Flange
Material: Carbon Steel, Stainless Steel, Alloy Steel, Duplex Stainless Steel
Standard: ASME B16.47 Series B
Pressure Class: Class 300
Flange Type: Blind Flange
Flange Face Type: Raised Face (RF), Flat Face (FF), RTJ upon request
Connection: Bolted Connection
Manufacturing Process: Forging and Machining
ASME B16.47 Series B Class 300 Blind Flanges are large-diameter flanges designed to close the ends of piping systems or isolate sections of pipelines and equipment. The solid construction provides reliable sealing and makes the flange easy to remove when inspection or maintenance is required.
They are suitable for oil and gas, petrochemical, power generation and other industrial piping applications. The referenced Class 300 Series B Blind Flange page lists sizes from NPS 26" to NPS 60" and also notes that customized flange and bolt-hole requirements are available.
Product Description
ASME B16.47 Series B Class 300 Blind Flanges are solid flanges without a center bore. They are primarily used to close the end of a piping system or provide a removable end cover for piping equipment.
The blind flange is connected to a mating flange with bolts and nuts, creating a closed connection. This design makes it suitable for pipeline isolation, maintenance, inspection and system shut-off applications.
Compared with permanent welded closures, blind flanges provide convenient access when the pipeline needs to be reopened for maintenance or modification.
Product Parameters
| Parameter | Specification |
|---|---|
| Product Name | ASME B16.47 Series B Class 300 Blind Flange |
| Standard | ASME B16.47 Series B |
| Pressure Class | Class 300 |
| Size Range | NPS 26" – NPS 60" |
| Flange Type | Blind Flange |
| Standard Facing | 1/16" Raised Face |
| Material | Carbon Steel, Stainless Steel, Alloy Steel, Duplex Stainless Steel |
| Connection | Bolted Connection |
| Manufacturing | Forging and Machining |
| Customization | Available |
ASME B16.47 Series B Class 300 Blind Flange Dimensions
The following dimensions are taken directly from the specified Class 300 Series B Blind Flange page. All dimensions are in inches.
| Nominal Pipe Size | Outside Diameter (O) | Bolt Circle (W) | Raised Face Diameter (R) | Number of Holes | Diameter of Holes | Minimum Thickness (T) | Approximate Weight (lbs) |
|---|---|---|---|---|---|---|---|
| 26 | 34.12 | 31.62 | 29.00 | 32 | 1.38 | 3.50 | 905 |
| 28 | 36.25 | 33.75 | 31.00 | 36 | 1.38 | 3.50 | 1023 |
| 30 | 39.00 | 36.25 | 33.25 | 36 | 1.50 | 3.69 | 1250 |
| 32 | 41.50 | 38.50 | 35.50 | 32 | 1.62 | 4.06 | 1556 |
| 34 | 43.62 | 40.62 | 37.50 | 36 | 1.62 | 4.06 | 1719 |
| 36 | 46.12 | 42.88 | 39.75 | 32 | 1.75 | 4.06 | 1920 |
| 38 | 48.12 | 44.88 | 41.75 | 36 | 1.75 | 4.38 | 2257 |
| 40 | 50.12 | 46.88 | 43.88 | 40 | 1.75 | 4.56 | 2550 |
| 42 | 52.50 | 49.00 | 46.00 | 36 | 1.88 | 4.69 | 2875 |
| 44 | 54.50 | 51.00 | 48.00 | 40 | 1.88 | 5.00 | 3305 |
| 46 | 57.50 | 53.75 | 50.00 | 36 | 2.00 | 5.12 | 3766 |
| 48 | 59.50 | 55.75 | 52.25 | 40 | 2.00 | 5.31 | 4183 |
| 50 | 61.50 | 57.75 | 54.25 | 44 | 2.00 | 5.50 | 4629 |
| 52 | 63.50 | 59.75 | 56.25 | 48 | 2.00 | 5.68 | 5096 |
| 54 | 65.88 | 62.12 | 58.25 | 48 | 2.00 | 5.88 | 5679 |
| 56 | 69.50 | 65.00 | 60.50 | 36 | 2.38 | 6.18 | 6642 |
| 58 | 71.94 | 67.44 | 62.75 | 40 | 2.38 | 6.38 | 7347 |
| 60 | 73.94 | 69.44 | 65.00 | 40 | 2.38 | 6.56 | 7980 |
Note: All dimensions are in inches. These flanges are furnished with a 1/16" raised face unless otherwise specified.
ASME B16.47 FLANGE CLASSES
Choose The Pressure Class Below
ASME B16.47 Series A
| Welding Neck Flanges | Blind Flanges |
|---|---|
| Class 150 | Class 150 |
| Class 300 | Class 300 |
| Class 400 | Class 400 |
| Class 600 | Class 600 |
| Class 900 | Class 900 |
ASME B16.47 Series B
| Welding Neck Flanges | Blind Flanges |
|---|---|
| Class 75 | Class 75 |
| Class 150 | Class 150 |
| Class 300 | Class 300 |
| Class 400 | Class 400 |
| Class 600 | Class 600 |
| Class 900 | Class 900 |
Blind Flange
A Blind Flange is a solid flange without a main center opening. It is used to close the end of a piping system or to provide an end cover for equipment such as valves and pumps.
The flange is installed against the corresponding mating flange and secured with bolts and nuts. Because it can be removed, it provides convenient access to the piping system for inspection, cleaning, maintenance or future expansion.
Advantages of Blind Flange
Reliable Sealing
The solid flange construction provides effective closure and isolation for large-diameter piping systems.
Easy Maintenance
The bolted design can be removed when pipeline inspection, cleaning or maintenance is required.
Large-Diameter Capability
ASME B16.47 Series B Class 300 Blind Flanges are available from NPS 26" through NPS 60".
Strong Construction
Forged construction provides strength and durability for demanding industrial piping applications.
Custom Options
Customized flange types and bolt-hole configurations can be manufactured according to specific project requirements.
Applications
ASME B16.47 Series B Class 300 Blind Flanges are suitable for:
Oil & Gas Pipelines
Petrochemical Plants
Power Generation
Chemical Processing
Large-Diameter Piping Systems
Pipeline Isolation
Equipment Closure
Pipeline Maintenance
Pressure Testing
The source page specifically identifies oil and gas, petrochemical and power generation as application industries.
PRODUCTION PROCESS
Raw Material → Cutting → Forging → Heat Treatment → Machining → Drilling → Sealing Face Machining → Dimensional Inspection → Surface Treatment → Final Inspection → Packing
Each flange is machined and inspected to ensure the outside diameter, bolt circle, bolt-hole dimensions, flange thickness and sealing face meet the required specifications.
Why Choose Us
ASME Standard
Manufactured according to ASME B16.47 requirements.
Large Size Range
NPS 26"–60" available.
Quality Control
Strict inspection before delivery.
Custom Service
Customized materials and dimensions available.
Professional Support
Technical support for different project requirements.
COMPANY PROFILE
We are a professional manufacturer of forged flanges and industrial pipe fittings, providing standard and customized flange solutions for global customers.
Our product range includes Welding Neck Flanges, Blind Flanges, Slip On Flanges, Socket Weld Flanges, Threaded Flanges, Lap Joint Flanges, Plate Flanges and other forged flange products.
We supply flanges for oil & gas, petrochemical, power generation, chemical processing, marine, water treatment and other industrial piping applications.
FAQ
What is an ASME B16.47 Series B Class 300 Blind Flange?
It is a large-diameter solid flange manufactured to ASME B16.47 Series B dimensions and used to close or isolate piping systems.
What sizes are available?
The referenced Class 300 Series B dimensional table covers NPS 26" to NPS 60".
What is the standard flange face?
The referenced page specifies a 1/16" raised face unless otherwise specified.
What is a blind flange used for?
Blind flanges are commonly used for closing pipe ends, isolating piping sections and providing removable access for inspection or maintenance.
Can you manufacture customized blind flanges?
Yes. Customized flange and bolt-hole requirements can be produced according to customer specifications.
Which industries use Class 300 Series B Blind Flanges?
Typical applications include oil & gas, petrochemical, power generation and other large-diameter industrial piping systems.
Contact Us
Looking for reliable ASME B16.47 Series B Class 300 Blind Flanges?
Contact our technical team for dimensional confirmation, material selection, customized manufacturing and quotations.
Shanxi HongKai Forging Co., Ltd.
Address: Cuijiazhuang Industrial Park, Dingxiang County, Shanxi Province, China
Telephone: +86 13716747092
Email: kevin.zhao@hkflange.com
Clear Communication, and Reliable Technical Support