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ASME B16.47 Series A Class 900 Blind Flange
Material: Carbon Steel, Stainless Steel, Alloy Steel, Duplex Stainless Steel
Thickness: According to ASME B16.47 Series A Class 900
Standard: ASME B16.47 Series A
Pressure Class: Class 900
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 900 Blind Flanges are large-diameter forged closure flanges designed for demanding industrial piping systems.
A blind flange has no central pipe opening and is used to close the end of a pipeline, valve, pressure vessel, pump, heat exchanger, or other process equipment.
The bolted construction provides reliable pipeline isolation while allowing the flange to be removed when inspection, maintenance, pressure testing, cleaning, or system modification is required.
These flanges are widely used in oil and gas, petrochemical, power generation, chemical processing, offshore engineering, and heavy industrial piping systems. The reference page specifically highlights oil and gas, petrochemical, and power generation applications.
ASME B16.47 Series A Class 900 Blind Flange Descriptions
ASME B16.47 Series A Class 900 Blind Flanges are manufactured for large-diameter piping systems according to ASME B16.47 Series A dimensional requirements.
Unlike a Welding Neck Flange, a Blind Flange has no pipe bore or welding neck. Its solid circular construction provides complete closure of a piping or equipment connection.
The flange is installed using suitable bolts, nuts, and a gasket. This provides reliable sealing while still allowing the system to be opened later when maintenance or inspection is necessary.
Class 900 Blind Flanges are suitable for demanding systems requiring high mechanical strength and reliable pipeline isolation.
Product Parameters
| Parameter | Description |
|---|---|
| Product Name | ASME B16.47 Series A Class 900 Blind Flange |
| Standard | ASME B16.47 Series A |
| Pressure Rating | Class 900 |
| Size Range | NPS 26" – NPS 48" |
| 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 900 Blind Flange Dimensions
Class 900 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 | 42.75 | 37.50 | 29.50 | 20 | 2.88 | 6.31 | 2565 |
| 28 | 46.00 | 40.25 | 31.50 | 20 | 3.12 | 6.75 | 3178 |
| 30 | 48.50 | 42.75 | 33.75 | 20 | 3.12 | 7.18 | 3759 |
| 32 | 51.75 | 45.50 | 36.00 | 20 | 3.38 | 7.62 | 4541 |
| 34 | 55.00 | 48.25 | 38.00 | 20 | 3.62 | 8.06 | 5425 |
| 36 | 57.50 | 50.75 | 40.25 | 20 | 3.62 | 8.44 | 6210 |
| 38 | 57.50 | 50.75 | 43.25 | 20 | 3.62 | 8.50 | 6253 |
| 40 | 59.50 | 52.75 | 45.75 | 24 | 3.62 | 8.81 | 6940 |
| 42 | 61.50 | 54.75 | 47.75 | 24 | 3.62 | 9.12 | 7675 |
| 44 | 64.88 | 57.62 | 50.00 | 24 | 3.88 | 9.56 | 8955 |
| 46 | 68.25 | 60.50 | 52.50 | 24 | 4.12 | 10.06 | 10,426 |
| 48 | 70.25 | 62.50 | 54.50 | 24 | 4.12 | 10.38 | 11,398 |
Notes:
- All dimensions are in inches.
- The target Class 900 product page says these flanges are furnished with a 1/16" Raised Face unless otherwise specified.
- The broader Series A Blind Flange reference page lists Class 900 with a 1/4" Raised Face, so the source site itself is internally inconsistent on this note. I recommend confirming your preferred raised-face note before publishing.
- Customized flange facings, materials, coatings, markings, and machining requirements can be supplied.
Blind Flange
A Blind Flange is a solid circular flange without a central pipe opening.
Its main purpose is to close or isolate piping systems and equipment connections.
Because the flange is installed using bolts and a gasket rather than permanently welding the pipeline shut, it can be removed when system access is required.
Typical functions include:
- Pipeline closure
- Pipeline isolation
- Equipment termination
- Pressure testing
- Inspection access
- 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 900 Blind Flange
Reliable Pipeline Isolation
The solid flange structure provides complete closure for pipeline ends and equipment connections.
Strong Mechanical Performance
Forged construction provides excellent strength for demanding large-diameter piping systems.
Reliable Sealing
Precision-machined sealing surfaces provide stable gasket contact and dependable sealing.
Easy Maintenance
The bolted construction allows the flange to be removed when inspection, testing, or maintenance is required.
Suitable for Severe Service
Class 900 Blind Flanges are suitable for demanding industrial systems involving elevated pressure and temperature conditions.
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, compressor stations, refinery systems, processing facilities, and equipment closure.
Petrochemical Industry
Suitable for process piping, reactors, pressure vessels, heat exchangers, tanks, pumps, and valves.
Chemical Processing
Used to isolate pipelines carrying chemicals, gases, and industrial process media.
Power Generation
Applied in process piping, cooling systems, auxiliary pipelines, and power-generation equipment.
Offshore and Marine
Suitable for offshore platforms, marine piping, seawater systems, and oil and gas production facilities.
Industrial Piping
Used in heavy industrial plants, pressure equipment, machinery, valves, pumps, and critical piping systems.
PRODUCTION PROCESS
Our ASME B16.47 Series A Class 900 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 stage is controlled to ensure accurate dimensions, correct bolt-hole arrangements, stable material properties, 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, and 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 900 Blind Flange?
It is a large-diameter solid flange without a central pipe bore, designed to close or isolate piping systems and equipment connections.
What sizes are available?
The reference dimensional table covers NPS 26" to NPS 48".
What does Class 900 mean?
Class 900 is an ASME pressure-temperature class designation. Actual allowable working pressure depends on material, operating temperature, gasket, bolting, and piping-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 used to close pipeline ends, isolate sections of piping, terminate equipment connections, and provide access for testing or maintenance.
What flange facing is available?
Raised Face, Flat Face, and RTJ configurations can be supplied according to project requirements.
Can customized Blind Flanges be manufactured?
Yes. Customized dimensions, materials, facings, coatings, markings, and inspection requirements can be supplied.
Where are Class 900 Blind Flanges commonly used?
They are commonly used in oil and gas, petrochemical, power generation, chemical processing, offshore, marine, and other demanding industrial piping systems.
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 900 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