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ASME B16.47 Series B Class 75 Blind Flange
Material: Carbon Steel, Stainless Steel, Alloy Steel, Duplex Stainless Steel
Thickness: According to ASME B16.47 Series B Class 75
Standard: ASME B16.47 Series B
Pressure Class: Class 75
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 B Class 75 Blind Flanges are large-diameter forged closure flanges designed for industrial piping systems that require reliable sealing, dimensional accuracy, and easy isolation.
A blind flange has no central pipe opening and is mainly used to close the end of a pipeline or equipment connection. It can also provide isolation while allowing the system to be reopened later for inspection, cleaning, maintenance, or pressure testing.
These flanges are commonly used in oil and gas, petrochemical, and power generation applications. The reference page also notes that customized flange and bolt-hole configurations are available.
ASME B16.47 Series B Class 75 Blind Flange Descriptions
ASME B16.47 Series B Class 75 Blind Flanges are manufactured for large-diameter piping systems according to ASME B16.47 Series B dimensional requirements.
A Blind Flange, also known as a blind plate, does not contain a main pipe opening. It is used to close pipeline ends or equipment connections such as valves and pumps.
The flange is fixed to a matching flange using bolts and nuts, forming a closed connection. Its removable construction also makes pipeline cleaning, debris removal, maintenance, and isolation more convenient.
Product Parameters
| Parameter | Description |
|---|---|
| Product Name | ASME B16.47 Series B Class 75 Blind Flange |
| Standard | ASME B16.47 Series B |
| Pressure Rating | Class 75 |
| 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, Power Generation and Industrial Pipelines |
ASME B16.47 Series B Class 75 Blind Flange Dimensions
Class 75 Dimensions | ASME B16.47 Series B Flange
Unit: Inch
| 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 | 30.00 | 28.50 | 27.75 | 36 | 0.75 | 1.31 | 255 |
| 28 | 32.00 | 30.50 | 29.75 | 40 | 0.75 | 1.31 | 290 |
| 30 | 34.00 | 32.50 | 31.75 | 44 | 0.75 | 1.31 | 330 |
| 32 | 36.00 | 34.50 | 33.75 | 48 | 0.75 | 1.44 | 390 |
| 34 | 38.00 | 36.50 | 35.75 | 52 | 0.75 | 1.50 | 430 |
| 36 | 40.69 | 39.06 | 38.00 | 40 | 0.88 | 1.67 | 520 |
| 38 | 42.69 | 41.06 | 40.00 | 40 | 0.88 | 1.75 | 595 |
| 40 | 44.69 | 43.06 | 42.00 | 44 | 0.88 | 1.75 | 760 |
| 42 | 46.69 | 45.06 | 44.00 | 48 | 0.88 | 1.88 | 895 |
| 44 | 49.25 | 47.38 | 46.25 | 36 | 1.00 | 1.94 | 1065 |
| 46 | 51.25 | 49.38 | 48.25 | 40 | 1.00 | 2.00 | 1185 |
| 48 | 53.25 | 51.38 | 50.25 | 44 | 1.00 | 2.12 | 1315 |
| 50 | 55.25 | 53.38 | 52.25 | 44 | 1.00 | 2.18 | 1505 |
| 52 | 57.38 | 55.50 | 54.25 | 48 | 1.00 | 2.25 | 1665 |
| 54 | 59.38 | 57.50 | 56.25 | 48 | 1.00 | 2.38 | 1840 |
| 56 | 62.00 | 59.88 | 58.50 | 40 | 1.12 | 2.44 | 2111 |
| 58 | 64.00 | 61.88 | 60.50 | 44 | 1.12 | 2.50 | 2300 |
| 60 | 66.00 | 63.88 | 62.50 | 44 | 1.12 | 2.62 | 2500 |
Notes:
- All dimensions are in inches.
- These flanges are furnished with a 1/16" Raised Face unless otherwise specified.
- Other flange facings and customized machining can be supplied according to customer requirements.
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 central pipe opening.
Its main purpose is to close or isolate piping systems and equipment connections. It is commonly used where a removable but secure closure is required.
The reference page describes Blind Flanges as suitable for blocking pipe ends, closing valves or pumps, removing debris from pipelines, and providing isolation in systems requiring complete shutoff.
Typical functions include:
- Pipeline closure
- Equipment isolation
- Pressure testing
- Maintenance access
- Debris removal
- Future system expansion
Advantages of ASME B16.47 Series B Class 75 Blind Flange
Reliable Pipeline Closure
The solid flange design provides complete closure for pipeline ends and equipment connections.
Easy Maintenance
The bolted connection allows the flange to be removed for inspection, cleaning, or maintenance.
Reliable Sealing
Precision-machined sealing surfaces provide stable gasket contact.
Suitable for Large-Diameter Piping
Series B Class 75 Blind Flanges are designed for large industrial piping systems.
Multiple Material Options
Carbon steel, stainless steel, alloy steel, and duplex stainless steel are available.
Applications
Oil and Gas Industry
Used for pipeline closure, isolation points, storage systems, and equipment connections.
Petrochemical Industry
Suitable for process piping, tanks, pressure vessels, pumps, valves, and heat exchangers.
Power Generation
Applied in cooling water systems, auxiliary piping, and other industrial pipeline systems.
Chemical Processing
Used to isolate pipelines carrying chemicals, gases, and process fluids.
Water and Utility Systems
Suitable for large-diameter water, utility, and general industrial pipelines.
Industrial Piping
Used in machinery, pressure equipment, pumps, valves, and large piping networks.
PRODUCTION PROCESS
Our ASME B16.47 Series B Class 75 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 B Class 75 Blind Flange?
It is a large-diameter solid flange without a central pipe opening, designed to close or isolate pipelines and equipment connections.
What sizes are available?
The reference table covers NPS 26" to NPS 60".
What does Class 75 mean?
Class 75 is an ASME pressure-temperature class designation used for ASME B16.47 Series B flanges. Actual allowable working pressure depends on material, temperature, gasket, bolting, and 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 for pipeline closure, equipment isolation, maintenance access, pressure testing, and system shutdown.
What flange facing is normally supplied?
The reference page states that these flanges are furnished with a 1/16" Raised Face unless otherwise specified.
Can customized Blind Flanges be manufactured?
Yes. The reference page specifically states that customized flange types and hole configurations can be supplied according to customer technical or design requirements.
Where are Series B Class 75 Blind Flanges commonly used?
They are commonly used in oil and gas, petrochemical, power generation, chemical processing, and other large-diameter industrial piping systems.
Can inspection certificates be supplied?
Yes. Material certificates, dimensional inspection 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 B Class 75 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