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ASME B16.47 Series A Class 300 Blind Flange
Material: Carbon Steel, Stainless Steel, Alloy Steel, Duplex Stainless Steel
Thickness: According to ASME B16.47 Series A Class 300
Standard: ASME B16.47 Series A
Pressure Class: Class 300
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 300 Blind Flanges are large-diameter pipeline closure components manufactured according to ASME B16.47 Series A dimensional requirements.
Unlike flanges with a central bore, a blind flange consists of a solid plate that closes the end of a piping system, valve, pressure vessel, pump, or other process equipment. It provides reliable isolation while allowing the system to be reopened later for inspection, maintenance, cleaning, or modification.
ASME B16.47 Series A Class 300 Blind Flanges are designed for large-diameter industrial piping systems requiring strong mechanical performance, accurate dimensional control, and dependable sealing.
They are widely used in oil and gas, petrochemical processing, chemical plants, power generation, water treatment, offshore engineering, pressure vessels, and other heavy-duty industrial piping applications.
ASME B16.47 Series A Class 300 Blind Flange Descriptions
ASME B16.47 Series A Class 300 Blind Flanges are forged pipeline closure components designed for large-diameter pipe systems.
A blind flange does not contain a center bore. Instead, its solid construction completely closes the pipeline or equipment opening. It is typically installed against a matching flange using bolts, nuts, and a suitable gasket.
Because the flange can be removed without cutting the pipeline, it provides convenient access for future inspection, cleaning, maintenance, pressure testing, or system modification.
ASME B16.47 Series A specifies dimensional requirements for large-diameter steel flanges, including flange outside diameter, bolt circle, bolt-hole arrangement, raised-face diameter, flange thickness, and other critical dimensions.
Class 300 Blind Flanges are commonly selected where greater mechanical strength and higher pressure-temperature capability are required compared with lower pressure classes.
The actual allowable operating pressure depends on flange material, temperature, applicable piping code, gasket, bolting, and system design.
Product Parameters
| Parameter | Description |
|---|---|
| Product Name | ASME B16.47 Series A Class 300 Blind Flange |
| Standard | ASME B16.47 Series A |
| Pressure Rating | Class 300 |
| Flange Size Range | NPS 26" – NPS 60" |
| Flange Type | Blind Flange |
| Sealing Surface | Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ) upon request |
| Flange Material | Carbon Steel, Stainless Steel, Alloy Steel, Duplex Stainless Steel |
| Connection | Bolted Flange Connection |
| Main Function | Pipeline closure, isolation and equipment termination |
| Surface Treatment | Anti-rust oil, black painting, yellow painting, galvanizing or customized coating |
| Production Process | Forging and Machining |
| Inspection Standard | Dimensional Inspection, Visual Inspection, Material Testing, UT, MT, PMI, Hardness Testing and other project-required inspection |
| Marking | Manufacturer, Size, Pressure Class, Material Grade, Heat Number and Standard according to requirements |
| Application | Oil & Gas, Petrochemical, Chemical Processing, Power Generation, Water Treatment, Offshore and Industrial Piping |
ASME B16.47 Series A Class 300 Blind Flange Dimensions
Class 300 Dimensions | ASME B16.47 Series A 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 | 38.25 | 34.50 | 29.50 | 28 | 1.75 | 3.31 | 1079 |
| 28 | 40.75 | 37.00 | 31.50 | 28 | 1.75 | 3.56 | 1315 |
| 30 | 43.00 | 39.25 | 33.75 | 28 | 1.88 | 3.75 | 1545 |
| 32 | 45.25 | 41.50 | 36.00 | 28 | 2.00 | 3.94 | 1795 |
| 34 | 47.50 | 43.50 | 38.00 | 28 | 2.00 | 4.12 | 2068 |
| 36 | 50.00 | 46.00 | 40.25 | 32 | 2.12 | 4.38 | 2435 |
| 38 | 46.00 | 43.00 | 40.50 | 32 | 1.62 | 4.25 | 2001 |
| 40 | 48.75 | 45.50 | 42.75 | 32 | 1.75 | 4.50 | 2380 |
| 42 | 50.75 | 47.50 | 44.75 | 32 | 1.75 | 4.69 | 2689 |
| 44 | 53.25 | 49.75 | 47.00 | 32 | 1.88 | 4.88 | 3079 |
| 46 | 55.75 | 52.00 | 49.00 | 28 | 2.00 | 5.06 | 3500 |
| 48 | 57.75 | 54.00 | 51.25 | 32 | 2.00 | 5.25 | 3896 |
| 50 | 60.25 | 56.25 | 53.50 | 32 | 2.12 | 5.50 | 4442 |
| 52 | 62.25 | 58.25 | 55.50 | 32 | 2.12 | 5.69 | 4906 |
| 54 | 65.25 | 61.00 | 57.75 | 28 | 2.38 | 6.00 | 5684 |
| 56 | 67.25 | 63.00 | 59.75 | 28 | 2.38 | 6.06 | 6099 |
| 58 | 69.25 | 65.00 | 62.00 | 32 | 2.38 | 6.25 | 6669 |
| 60 | 71.25 | 67.00 | 64.00 | 32 | 2.38 | 6.44 | 7274 |
Notes:
All dimensions are in inches.
These flanges are furnished with a 1/16" Raised Face unless otherwise specified.
Alternative flange facings can be manufactured according to project requirements.
Customized machining, coating, marking, inspection, and material requirements are available.
Advantages of ASME B16.47 Series A Class 300 Blind Flange
Reliable Pipeline Isolation
The solid construction of a Blind Flange completely closes a piping or equipment opening.
When installed with suitable gaskets and bolting, the flange provides dependable isolation for maintenance, pressure testing, system shutdown, or unused pipeline branches.
Strong Mechanical Performance
Forged ASME B16.47 Series A Class 300 Blind Flanges provide high structural strength and resistance to mechanical loading.
Their heavy-duty dimensions make them suitable for demanding large-diameter industrial piping systems.
Reliable Sealing Performance
Precision-machined sealing surfaces provide stable gasket contact and reliable flange joint sealing.
Raised Face, Flat Face, and other facing configurations can be supplied according to project requirements.
Easy Inspection and Maintenance
Unlike permanently welded pipe caps, a blind flange can be removed by loosening the flange bolts.
This provides convenient access to the pipeline for inspection, cleaning, repair, testing, or future expansion.
Standardized Dimensions
ASME B16.47 Series A specifies critical flange dimensions including:
Outside Diameter
Bolt Circle Diameter
Raised Face Diameter
Bolt-Hole Quantity
Bolt-Hole Diameter
Flange Thickness
Standardized dimensions help ensure proper compatibility with corresponding piping components.
Suitable for Large-Diameter Piping
ASME B16.47 Series A Class 300 Blind Flanges are designed for large nominal pipe sizes from NPS 26" through NPS 60".
They provide reliable closure solutions for pipelines, pressure equipment, and heavy industrial systems.
Multiple Material Options
Blind Flanges can be manufactured from carbon steel, stainless steel, alloy steel, duplex stainless steel, and other special materials according to operating conditions.
Applications
Oil and Gas Industry
ASME B16.47 Series A Class 300 Blind Flanges are widely used in oil and gas transmission pipelines, processing plants, compressor stations, terminals, storage facilities, and equipment connections.
They provide reliable isolation points for maintenance and pipeline shutdown operations.
Petrochemical Industry
Petrochemical facilities use Blind Flanges on process piping, reactors, heat exchangers, tanks, pumps, valves, and pressure equipment.
The removable bolted design simplifies inspection and maintenance.
Chemical Processing
Blind Flanges are used to close pipelines transporting chemicals, gases, and process fluids.
Different material grades can be selected according to corrosion resistance, temperature, and medium requirements.
Power Generation
Power generation facilities use Class 300 Blind Flanges in cooling systems, process water lines, auxiliary piping, and other large-diameter pipeline systems.
Water Treatment Systems
Water treatment plants, pumping stations, wastewater facilities, desalination plants, and industrial water networks use large Blind Flanges to close pipelines and equipment connections.
Offshore and Marine Engineering
Offshore platforms and marine facilities use Blind Flanges in process piping, seawater systems, oil and gas pipelines, cooling systems, and utility piping.
Special corrosion-resistant materials and protective coatings can be supplied for marine environments.
General Industrial Piping
ASME B16.47 Series A Class 300 Blind Flanges are also suitable for pressure vessels, machinery, pumps, valves, storage systems, industrial plants, and other large piping installations.
PRODUCTION PROCESS
Our ASME B16.47 Series A Class 300 Blind Flanges are manufactured through a controlled production process from raw material inspection to final shipment.
Raw Material Inspection → Material Cutting → Heating → Forging → Heat Treatment → Rough Machining → CNC Machining → Bolt Hole Drilling → Sealing Face Machining → Dimensional Inspection → NDT → Surface Treatment → Marking → Packaging → Shipment
Each manufacturing stage is monitored through material identification, dimensional control, process inspection, and final quality verification.
This process helps ensure accurate dimensions, correct bolt-hole arrangements, reliable sealing surfaces, stable mechanical properties, and compliance with applicable standards and customer specifications.
Why Choose Us
Experienced Flange Manufacturer
We specialize in manufacturing forged flanges for industrial piping systems.
Reliable Quality
Each flange is inspected for dimensions, material, and surface quality before shipment.
Multiple Material Options
Carbon steel, stainless steel, alloy steel, and duplex stainless steel are available.
Custom Manufacturing
Customized sizes, materials, facings, coatings, and markings can be supplied according to customer requirements.
International Supply
We supply flange products to customers in different industries and international markets.
COMPANY PROFILE
Shanxi HongKai Forging Co., Ltd. is located in Dingxiang County, Shanxi Province, China, an important flange and forging manufacturing base.
We specialize in the production of forged flanges and industrial forging products for international piping and engineering markets.
Our manufacturing capabilities cover:
Forging, Heat Treatment, Machining, Drilling, Physical and Chemical 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 in different pressure classes, dimensions, materials, and sealing configurations.
Our products can be supplied according to major international standards including:
ASME / ANSI / EN / DIN / JIS / AWWA / BS and other international standards.
Available materials include carbon steel, stainless steel, alloy steel, duplex stainless steel, and customized special materials.
Our forged flange products are widely supplied for oil and gas, petrochemical, chemical processing, power generation, water treatment, marine engineering, machinery, pressure vessels, and general industrial piping systems.
FAQ
What is an ASME B16.47 Series A Class 300 Blind Flange?
An ASME B16.47 Series A Class 300 Blind Flange is a large-diameter solid flange without a central pipe bore.
It is bolted to a matching flange to completely close or isolate a piping system or equipment connection.
What size range is available?
The ASME B16.47 Series A Class 300 Blind Flanges covered by this dimensional table are available from NPS 26" to NPS 60".
What does Class 300 mean?
Class 300 is an ASME pressure-temperature class designation.
It should not be interpreted as meaning that the flange has a fixed maximum working pressure of exactly 300 psi.
The allowable working pressure depends on material group, operating temperature, applicable piping code, gasket, bolting, and overall system design.
What flange facing is normally supplied?
Raised Face (RF) is commonly supplied.
The referenced ASME B16.47 Series A Class 300 Blind Flange dimensional table specifies a 1/16" raised face unless otherwise specified.
Other flange facing configurations can be supplied according to project requirements.
What is the difference between a Blind Flange and a Welding Neck Flange?
A Blind Flange is a solid flange without a central bore and is used to close a piping system.
A Welding Neck Flange contains a central bore and tapered hub and is butt welded to the pipe to create a continuous piping connection.
Can customized Blind Flanges be manufactured?
Yes.
We can manufacture Blind Flanges according to customer drawings and technical specifications, including customized dimensions, thicknesses, drilling patterns, materials, sealing faces, coatings, markings, and inspection requirements.
Can you provide inspection certificates?
Yes.
Material Test Certificates, chemical analysis reports, mechanical test reports, dimensional inspection reports, UT, MT, PMI, hardness testing, and third-party inspection documentation can be supplied according to project requirements.
Contact Us
Looking for reliable ASME B16.47 Series A Class 300 Blind Flanges for your piping or engineering project?
Contact our technical team for product selection, technical support, customized manufacturing, dimensional confirmation, and competitive 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