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ASME B16.47 Series A Class 400 Blind Flange
Material: Carbon Steel, Stainless Steel, Alloy Steel, Duplex Stainless Steel
Thickness: According to ASME B16.47 Series A Class 400
Standard: ASME B16.47 Series A
Pressure Class: Class 400
Flange Type: Blind Flange
Flange Face Type: Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ) upon request
Connection: Bolted Connection
Manufacturing Process: Forging and Machining
ASME B16.47 Series A Class 400 Blind Flanges are large-diameter forged pipeline closure components designed for demanding industrial piping systems.
Unlike flanges with a center bore, a blind flange has a solid structure and is used to close the end of a pipeline, valve, pressure vessel, pump, heat exchanger, or other process equipment.
The bolted design allows the flange to be removed when inspection, maintenance, cleaning, pressure testing, or future pipeline expansion is required.
ASME B16.47 Series A Class 400 Blind Flanges are widely used in oil and gas, petrochemical, chemical processing, power generation, offshore engineering, marine systems, water treatment, and other heavy-duty industrial pipelines.
ASME B16.47 Series A Class 400 Blind Flange Descriptions
ASME B16.47 Series A Class 400 Blind Flanges are manufactured for large-diameter piping systems according to ASME B16.47 Series A dimensional requirements.
A blind flange, also known as a blind plate, has no main pipe opening and is mainly used to close the end of a pipeline or equipment such as valves and pumps. It provides both isolation and sealing functions and can also make pipeline cleaning and maintenance easier.
The flange is installed against a matching flange using bolts, nuts, and a suitable gasket. Because it can be removed without cutting or welding the pipeline, it provides convenient access for inspection, pressure testing, cleaning, maintenance, or future system expansion.
Product Parameters
| Parameter | Description |
|---|---|
| Product Name | ASME B16.47 Series A Class 400 Blind Flange |
| Standard | ASME B16.47 Series A |
| Pressure Rating | Class 400 |
| Size Range | NPS 26" – NPS 60" |
| Flange Type | Blind Flange |
| Connection | Bolted Connection |
| Flange Facing | RF, FF, RTJ upon request |
| Material | Carbon Steel, Stainless Steel, Alloy Steel, Duplex Stainless Steel |
| Manufacturing | Forging + Heat Treatment + CNC Machining |
| Surface Treatment | Anti-rust oil, painting, galvanizing or customized coating |
| Inspection | Dimensional Inspection, Visual Inspection, UT, MT, PMI, Hardness Testing |
| Application | Oil & Gas, Petrochemical, Chemical Processing, Power Generation, Offshore and Industrial Pipelines |
ASME B16.47 Series A Class 400 Blind Flange Dimensions
Class 400 Dimensions | ASME B16.47 Series A Flange
| 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 | 38.25 | 34.50 | 29.50 | 28 | 1.88 | 3.88 | 1263 |
| 28 | 40.75 | 37.00 | 31.50 | 28 | 2.00 | 4.12 | 1520 |
| 30 | 43.00 | 39.25 | 33.75 | 28 | 2.12 | 4.38 | 1802 |
| 32 | 45.25 | 41.50 | 36.00 | 28 | 2.12 | 4.56 | 2075 |
| 34 | 47.50 | 43.50 | 38.00 | 28 | 2.12 | 4.81 | 2415 |
| 36 | 50.00 | 46.00 | 40.25 | 32 | 2.12 | 5.06 | 2815 |
| 38 | 47.50 | 44.00 | 40.75 | 32 | 1.88 | 4.88 | 2450 |
| 40 | 50.00 | 46.25 | 43.00 | 32 | 2.00 | 5.12 | 2849 |
| 42 | 52.00 | 48.25 | 45.00 | 32 | 2.00 | 5.25 | 3160 |
| 44 | 54.50 | 50.50 | 47.25 | 32 | 2.12 | 5.50 | 3635 |
| 46 | 56.75 | 52.75 | 49.50 | 36 | 2.12 | 5.75 | 4120 |
| 48 | 59.50 | 55.25 | 51.50 | 28 | 2.38 | 6.00 | 4725 |
| 50 | 61.75 | 57.50 | 53.62 | 32 | 2.38 | 6.25 | 5303 |
| 52 | 63.75 | 59.50 | 55.62 | 32 | 2.38 | 6.44 | 5823 |
| 54 | 67.00 | 62.25 | 57.88 | 28 | 2.62 | 6.75 | 6742 |
| 56 | 69.00 | 64.25 | 60.12 | 32 | 2.62 | 6.94 | 7352 |
| 58 | 71.00 | 66.25 | 62.12 | 32 | 2.62 | 7.12 | 7986 |
| 60 | 74.25 | 69.00 | 64.38 | 32 | 2.88 | 7.44 | 9126 |
Notes:
- All dimensions are in inches.
- These flanges are furnished with a 1/16" Raised Face unless otherwise specified.
- Other flange facings can be supplied according to project requirements.
- Customized machining, materials, coatings, markings, and inspection requirements are available.
Blind Flange
A Blind Flange is a solid flange without a central pipe opening.
Its main purpose is to close or isolate a piping system, valve, pump, pressure vessel, or other equipment connection.
Because it is installed using bolts and gaskets rather than being permanently welded shut, it can be removed when inspection, cleaning, testing, maintenance, or future system modification is required.
Typical functions include:
- Pipeline closure
- Pipeline isolation
- Equipment termination
- Pressure testing
- Maintenance access
- Future pipeline expansion
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 |
Advantages of ASME B16.47 Series A Class 400 Blind Flange
Reliable Pipeline Closure
The solid design provides complete closure for pipeline ends and equipment connections.
Strong Mechanical Performance
Forged construction provides good structural strength for large-diameter industrial piping systems.
Reliable Sealing
Precision-machined flange faces provide stable gasket contact and dependable sealing.
Easy Maintenance
The bolted design allows the flange to be removed when inspection or maintenance is required.
Large-Diameter Capability
ASME B16.47 Series A Class 400 Blind Flanges are suitable for NPS 26" through NPS 60" piping systems.
Multiple Material Options
Carbon steel, stainless steel, alloy steel, and duplex stainless steel are available.
Applications
Oil and Gas Industry
Used for large-diameter pipeline isolation, processing facilities, compressor stations, storage systems, and equipment connections.
Petrochemical Industry
Suitable for process piping, tanks, reactors, pressure vessels, pumps, valves, and heat exchangers.
Chemical Processing
Used for pipelines carrying chemicals, gases, and industrial process fluids.
Power Generation
Applied in cooling water, auxiliary piping, process water, and other industrial pipeline systems.
Offshore and Marine
Used in offshore platforms, marine pipelines, seawater systems, and oil and gas production facilities.
Industrial Piping
Suitable for factories, pressure equipment, pumps, valves, machinery, and large industrial piping networks.
PRODUCTION PROCESS
Our ASME B16.47 Series A Class 400 Blind Flanges are manufactured through a controlled production process.
Raw Material Inspection → Cutting → Heating → Forging → Heat Treatment → Rough Machining → CNC Machining → Drilling → Sealing Face Machining → Inspection → Surface Treatment → Marking → Packing
Each production stage is controlled to ensure accurate dimensions, stable material properties, correct bolt-hole arrangements, and reliable sealing surfaces.
Why Choose Us
Experienced Manufacturer
We specialize in forged flange manufacturing for industrial piping systems.
Reliable Quality
Each flange is inspected before shipment.
Multiple Material Options
Carbon steel, stainless steel, alloy steel, and duplex stainless steel are available.
Custom Manufacturing
Customized sizes, facings, coatings, and markings can be supplied.
International Supply
We supply flange products to customers in different industries and global markets.
COMPANY PROFILE
Shanxi HongKai Forging Co., Ltd. is located in Dingxiang County, Shanxi Province, China, an important manufacturing base for forged flanges.
We specialize in the production of forged flanges and industrial forging products for international piping and engineering projects.
Our manufacturing capabilities include:
Forging, Heat Treatment, CNC Machining, Drilling, Testing, Surface Treatment, Marking, Packaging and Shipment.
We manufacture:
- Blind Flanges
- Welding Neck Flanges
- Slip On Flanges
- Socket Weld Flanges
- Threaded Flanges
- Lap Joint Flanges
- Customized Forged Flanges
Our products can be supplied according to:
ASME / ANSI / EN / DIN / JIS / AWWA / BS and other international standards.
Available materials include carbon steel, stainless steel, alloy steel, duplex stainless steel, and special material grades.
FAQ
What is an ASME B16.47 Series A Class 400 Blind Flange?
It is a large-diameter solid flange without a central pipe opening, manufactured according to ASME B16.47 Series A Class 400 dimensional requirements.
What sizes are available?
The size range covered by the reference table is NPS 26" to NPS 60".
What does Class 400 mean?
Class 400 is an ASME pressure-temperature class designation. Actual allowable working pressure depends on material, operating temperature, gasket, bolting, and overall system design.
What materials are available?
Common materials include carbon steel, stainless steel, alloy steel, and duplex stainless steel.
What is a Blind Flange used for?
It is mainly used to close pipeline ends, isolate piping sections, terminate equipment connections, and provide maintenance or pressure-testing access.
What flange facing is normally supplied?
The referenced page states that these flanges are furnished with a 1/16" Raised Face unless otherwise specified.
Can customized Blind Flanges be manufactured?
Yes. Customized dimensions, materials, facings, coatings, markings, and inspection requirements can be supplied.
Where are Class 400 Blind Flanges used?
They are commonly used in oil and gas, petrochemical, power generation, chemical processing, offshore, marine, and other large industrial piping systems. The reference product page specifically mentions oil and gas, petrochemical, and power generation applications.
Can inspection certificates be supplied?
Yes. Material certificates, dimensional reports, UT, MT, PMI, hardness testing, and third-party inspection documentation can be supplied when required.
Contact Us
Looking for reliable ASME B16.47 Series A Class 400 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