Manufacturers of ASME/ANSI B16.5, B16.47 Blind Flange
A Blind Flange is a type of flange used to seal the end of a pipeline or vessel. Unlike other flanges, it has no opening in the center, effectively closing off the system. Blind flanges are often used for maintenance, inspection, or to block off unused openings in pipelines. They are available in various materials like carbon steel, stainless steel, and alloy steel and are commonly used in industries such as oil and gas, chemical, and water treatment. Blind flanges come in different pressure ratings and sizes to meet specific system requirements.
Blind Raised Face Flanges are primarily used to close the end of a pipe, valve, or vessel, effectively sealing the system. This is important for preventing leaks and ensuring system integrity during operation or maintenance. They help maintain the safety of the system by securely blocking off any unused or open connections, reducing the risk of contamination or pressure loss. Blind flanges are also used in systems where future expansion or additional connections may be required, allowing for easy modification or upgrades in the future.
Ample Alloys is a trusted manufacturer, supplier, and exporter of Blind Flanges, offering high-quality products that meet international standards. We ensures that its blind flanges are suitable for various industrial applications. Blind flanges from Ample Alloys are designed to provide reliable sealing for the ends of pipelines, vessels, and equipment, preventing leaks and maintaining system integrity. With a focus on precision, durability, and timely delivery, We delivers cost-effective solutions that meet the specific requirements of each client, backed by rigorous quality control and testing.
Carbon Steel, Stainless Steel, Alloy Steel Blind Flange, High Pressure Blind Flange, Welded Blind Flange, Flange Blind Plate, Forged Blind Flange, Raised Face Blind Flange, High-Temperature Blind Flange, ANSI 150 Blind Flange
BLRF Flange
Size Range
15mm ( 1/2" NPS ) up to 600mm ( 24" NPS ), For 2500# in sizes from NPS 1/2 to NPS 12
Flange Face Type
FF—Flat Face, RF—Raised Face, FM—Female Face, M—Male Face, T—Tongue Face, G—Groove Face, RJ—Ring Joint.
Stainless Steel
ASTM A182 F 304, 304L, 304H, 316, 316L, 316H, 317, 317L, 321, 321H, 310, 310S, 347, 904L, etc.
Standards / Dimension
ANSI/ASME B16.5, B 16.47 Series A & B, B16.48, BS4504, BS 10, EN-1092, DIN
Carbon Steel
ASTM A105/A105N (SA105N), LTCS A350 LF2, A694
Alloy Steel
ASTM A182 / SA182 - F1 / F5 / F9 / F11 / F12 / F22 / F91
Pressure Class
150#, 300#, 600#, 900#, 1500#, 2500#, PN6, PN10, PN16, PN25, PN40, PN64.
Duplex & Super Duplex
ASTM A182 / ASME SA182 - S31803, S32205, 2205, S32750, S32760, S32950, 2507.
MTC
EN 10204 3.2 and EN 10204 3.1, Test Certificates certifying NACE MR0175, NACE MR0103
| Nominal Pipe Size | Outside Diameter (O) | Thickness (T) | Raised Face Diameter (R) | Approximate Weight (lbs) | Bolt Circle (C) | Number of Holes | Diameter of Holes |
|---|---|---|---|---|---|---|---|
| 1/2 | 3.50 | 0.44 | 1.38 | 1 | 2.38 | 4 | 0.63 |
| 3/4 | 3.88 | 0.50 | 1.69 | 2 | 2.75 | 4 | 0.63 |
| 1 | 4.25 | 0.56 | 2.00 | 2 | 3.13 | 4 | 0.63 |
| 1 1/4 | 4.63 | 0.63 | 2.50 | 3 | 3.50 | 4 | 0.63 |
| 1 1/2 | 5.00 | 0.69 | 2.88 | 4 | 3.88 | 4 | 0.63 |
| 2 | 6.00 | 0.75 | 3.63 | 5 | 4.75 | 4 | 0.75 |
| 2 1/2 | 7.00 | 0.88 | 4.13 | 7 | 5.50 | 4 | 0.75 |
| 3 | 7.50 | 0.94 | 5.00 | 9 | 6.00 | 4 | 0.75 |
| 3 1/2 | 8.50 | 0.94 | 5.50 | 13 | 7.00 | 8 | 0.75 |
| 4 | 9.00 | 0.94 | 6.19 | 17 | 7.50 | 8 | 0.75 |
| 5 | 10.00 | 0.94 | 7.31 | 20 | 8.50 | 8 | 0.88 |
| 6 | 11.00 | 1.00 | 8.50 | 26 | 9.50 | 8 | 0.88 |
| 8 | 13.50 | 1.13 | 10.63 | 45 | 11.75 | 8 | 0.88 |
| 10 | 16.00 | 1.19 | 12.75 | 70 | 14.25 | 12 | 1.00 |
| 12 | 19.00 | 1.25 | 15.00 | 110 | 17.00 | 12 | 1.00 |
| 14 | 21.00 | 1.38 | 16.25 | 140 | 18.75 | 12 | 1.13 |
| 16 | 23.50 | 1.44 | 18.50 | 180 | 21.25 | 16 | 1.13 |
| 18 | 25.00 | 1.56 | 21.00 | 220 | 22.75 | 16 | 1.25 |
| 20 | 27.50 | 1.69 | 23.00 | 285 | 25.00 | 20 | 1.25 |
| 22 | 29.50 | 1.81 | 25.25 | 355 | 27.25 | 20 | 1.38 |
| 24 | 32.00 | 1.88 | 27.25 | 430 | 29.50 | 20 | 1.38 |
| Nominal Pipe Size | Outside Diameter (O) | Thickness (T) | Raised Face Diameter (R) | Approximate Weight (lbs) | Bolt Circle (C) | Number of Holes | Diameter of Holes |
|---|---|---|---|---|---|---|---|
| 1/2 | 3.75 | 0.56 | 1.38 | 2 | 2.63 | 4 | 0.63 |
| 3/4 | 4.63 | 0.63 | 1.69 | 3 | 3.25 | 4 | 0.75 |
| 1 | 4.88 | 0.69 | 2.00 | 3 | 3.50 | 4 | 0.75 |
| 1 1/4 | 5.25 | 0.75 | 2.50 | 4 | 3.88 | 4 | 0.75 |
| 1 1/2 | 6.13 | 0.81 | 2.88 | 6 | 4.50 | 4 | 0.88 |
| 2 | 6.50 | 0.88 | 3.63 | 8 | 5.00 | 8 | 0.75 |
| 2 1/2 | 7.50 | 1.00 | 4.13 | 12 | 5.88 | 8 | 0.88 |
| 3 | 8.25 | 1.13 | 5.00 | 16 | 6.63 | 8 | 0.88 |
| 3 1/2 | 9.00 | 1.19 | 5.50 | 21 | 7.25 | 8 | 0.88 |
| 4 | 10.00 | 1.25 | 6.19 | 27 | 7.88 | 8 | 0.88 |
| 5 | 11.00 | 1.38 | 7.31 | 35 | 9.25 | 8 | 0.88 |
| 6 | 12.50 | 1.44 | 8.50 | 50 | 10.63 | 12 | 0.88 |
| 8 | 15.00 | 1.63 | 10.63 | 81 | 13.00 | 12 | 1.00 |
| 10 | 17.50 | 1.88 | 12.75 | 124 | 15.25 | 16 | 1.13 |
| 12 | 20.50 | 2.00 | 15.00 | 185 | 17.75 | 16 | 1.25 |
| 14 | 23.00 | 2.13 | 16.25 | 250 | 20.25 | 20 | 1.25 |
| 16 | 25.50 | 2.25 | 18.50 | 295 | 22.50 | 20 | 1.38 |
| 18 | 28.00 | 2.38 | 21.00 | 395 | 24.75 | 24 | 1.38 |
| 20 | 30.50 | 2.50 | 23.00 | 505 | 27.00 | 24 | 1.38 |
| 22 | 33.00 | 2.63 | 25.25 | 640 | 29.25 | 24 | 1.63 |
| 24 | 36.00 | 2.75 | 27.25 | 790 | 32.00 | 24 | 1.63 |
| Nominal Pipe Size | Outside Diameter (O) | Thickness (T) | Raised Face Diameter (R) | Approximate Weight (lbs) | Bolt Circle (C) | Number of Holes | Diameter of Holes |
|---|---|---|---|---|---|---|---|
| 1/2 | 3.75 | 0.56 | 1.38 | 2 | 2.63 | 4 | 0.63 |
| 3/4 | 4.63 | 0.63 | 1.69 | 3 | 3.25 | 4 | 0.75 |
| 1 | 4.88 | 0.69 | 2.00 | 4 | 3.50 | 4 | 0.75 |
| 1 1/4 | 5.25 | 0.81 | 2.50 | 5 | 3.88 | 4 | 0.75 |
| 1 1/2 | 6.13 | 0.88 | 2.88 | 8 | 4.50 | 4 | 0.88 |
| 2 | 6.50 | 1.00 | 3.63 | 10 | 5.00 | 8 | 0.75 |
| 2 1/2 | 7.50 | 1.13 | 4.13 | 15 | 5.88 | 8 | 0.88 |
| 3 | 8.25 | 1.25 | 5.00 | 20 | 6.63 | 8 | 0.88 |
| 3 1/2 | 9.00 | 1.38 | 5.50 | 29 | 7.25 | 8 | 1.00 |
| 4 | 10.00 | 1.38 | 6.19 | 33 | 7.88 | 8 | 1.00 |
| 5 | 11.00 | 1.50 | 7.31 | 44 | 9.25 | 8 | 1.00 |
| 6 | 12.50 | 1.63 | 8.50 | 61 | 10.63 | 12 | 1.00 |
| 8 | 15.00 | 1.88 | 10.63 | 100 | 13.00 | 12 | 1.13 |
| 10 | 17.50 | 2.13 | 12.75 | 155 | 15.25 | 16 | 1.25 |
| 12 | 20.50 | 2.25 | 15.00 | 225 | 17.75 | 16 | 1.38 |
| 14 | 23.00 | 2.38 | 16.25 | 290 | 20.25 | 20 | 1.38 |
| 16 | 25.50 | 2.50 | 18.50 | 370 | 22.50 | 20 | 1.50 |
| 18 | 28.00 | 2.63 | 21.00 | 455 | 24.75 | 24 | 1.50 |
| 20 | 30.50 | 2.75 | 23.00 | 587 | 27.00 | 24 | 1.63 |
| 22 | 33.00 | 2.88 | 25.25 | 720 | 29.25 | 24 | 1.75 |
| 24 | 36.00 | 3.00 | 27.25 | 890 | 32.00 | 24 | 1.88 |
| Nominal Pipe Size | Outside Diameter (O) | Thickness (T) | Raised Face Diameter (R) | Approximate Weight (lbs) | Bolt Circle (C) | Number of Holes | Diameter of Holes |
|---|---|---|---|---|---|---|---|
| 1/2 | 3.75 | 0.56 | 1.38 | 2 | 2.63 | 4 | 0.63 |
| 3/4 | 4.63 | 0.63 | 1.69 | 3 | 3.25 | 4 | 0.75 |
| 1 | 4.88 | 0.69 | 2.00 | 4 | 3.50 | 4 | 0.75 |
| 1 1/4 | 5.25 | 0.81 | 2.50 | 5 | 3.88 | 4 | 0.75 |
| 1 1/2 | 6.13 | 0.88 | 2.88 | 8 | 4.50 | 4 | 0.88 |
| 2 | 6.50 | 1.00 | 3.63 | 10 | 5.00 | 8 | 0.75 |
| 2 1/2 | 7.50 | 1.13 | 4.13 | 15 | 5.88 | 8 | 0.88 |
| 3 | 8.25 | 1.25 | 5.00 | 20 | 6.63 | 8 | 0.88 |
| 3 1/2 | 9.00 | 1.38 | 5.50 | 29 | 7.25 | 8 | 1.00 |
| 4 | 10.75 | 1.50 | 6.19 | 41 | 8.50 | 8 | 1.00 |
| 5 | 13.00 | 1.75 | 7.31 | 68 | 10.50 | 8 | 1.13 |
| 6 | 14.00 | 1.88 | 8.50 | 86 | 11.50 | 12 | 1.13 |
| 8 | 16.50 | 2.19 | 10.63 | 140 | 13.75 | 12 | 1.25 |
| 10 | 20.00 | 2.50 | 12.75 | 230 | 17.00 | 16 | 1.38 |
| 12 | 22.00 | 2.63 | 15.00 | 295 | 19.25 | 20 | 1.38 |
| 14 | 23.75 | 2.75 | 16.25 | 355 | 20.75 | 20 | 1.50 |
| 16 | 27.00 | 3.00 | 18.50 | 495 | 23.75 | 20 | 1.63 |
| 18 | 29.25 | 3.25 | 21.00 | 630 | 25.75 | 20 | 1.75 |
| 20 | 32.00 | 3.50 | 23.00 | 810 | 28.50 | 24 | 1.75 |
| 22 | 34.25 | 3.75 | 25.25 | 1000 | 30.63 | 24 | 1.88 |
| 24 | 37.00 | 4.00 | 27.25 | 1250 | 33.00 | 24 | 2.00 |
| Nominal Pipe Size | Outside Diameter (O) | Thickness (T) | Raised Face Diameter (R) | Approximate Weight (lbs) | Bolt Circle (C) | Number of Holes | Diameter of Holes |
|---|---|---|---|---|---|---|---|
| 1/2 | 4.75 | 0.88 | 1.38 | 4 | 3.25 | 4 | 0.88 |
| 3/4 | 5.13 | 1.00 | 1.69 | 6 | 3.50 | 4 | 0.88 |
| 1 | 5.88 | 1.13 | 2.00 | 8 | 4.00 | 4 | 1.00 |
| 1 1/4 | 6.25 | 1.13 | 2.50 | 9 | 4.38 | 4 | 1.00 |
| 1 1/2 | 7.00 | 1.25 | 2.88 | 13 | 4.88 | 4 | 1.13 |
| 2 | 8.50 | 1.50 | 3.63 | 25 | 6.50 | 8 | 1.00 |
| 2 1/2 | 9.63 | 1.63 | 4.13 | 35 | 7.50 | 8 | 1.13 |
| 3 | 9.50 | 1.50 | 5.00 | 29 | 7.50 | 8 | 1.00 |
| 4 | 11.50 | 1.75 | 6.19 | 54 | 9.25 | 8 | 1.25 |
| 5 | 13.75 | 2.00 | 7.31 | 87 | 11.00 | 8 | 1.38 |
| 6 | 15.00 | 2.19 | 8.50 | 115 | 12.50 | 12 | 1.25 |
| 8 | 18.50 | 2.50 | 10.63 | 200 | 15.50 | 12 | 1.50 |
| 10 | 21.50 | 2.75 | 12.75 | 290 | 18.50 | 16 | 1.50 |
| 12 | 24.00 | 3.13 | 15.00 | 415 | 21.00 | 20 | 1.50 |
| 14 | 25.25 | 3.38 | 16.25 | 520 | 22.00 | 20 | 1.63 |
| 16 | 27.75 | 3.50 | 18.50 | 600 | 24.25 | 20 | 1.75 |
| 18 | 31.00 | 4.00 | 21.00 | 850 | 27.00 | 20 | 2.00 |
| 20 | 33.75 | 4.25 | 23.00 | 1075 | 29.50 | 20 | 2.13 |
| 24 | 41.00 | 5.50 | 27.25 | 2025 | 35.50 | 20 | 2.63 |
| Nominal Pipe Size | Outside Diameter (O) | Thickness (T) | Raised Face Diameter (R) | Approximate Weight (lbs) | Bolt Circle (C) | Number of Holes | Diameter of Holes |
|---|---|---|---|---|---|---|---|
| 1/2 | 4.75 | 0.88 | 1.38 | 4 | 3.25 | 4 | 0.88 |
| 3/4 | 5.13 | 1.00 | 1.69 | 6 | 3.50 | 4 | 0.88 |
| 1 | 5.88 | 1.13 | 2.00 | 8 | 4.00 | 4 | 1.00 |
| 1 1/4 | 6.25 | 1.13 | 2.50 | 9 | 4.38 | 4 | 1.00 |
| 1 1/2 | 7.00 | 1.25 | 2.88 | 13 | 4.88 | 4 | 1.13 |
| 2 | 8.50 | 1.50 | 3.63 | 25 | 6.50 | 8 | 1.00 |
| 2 1/2 | 9.63 | 1.63 | 4.13 | 35 | 7.50 | 8 | 1.13 |
| 3 | 10.50 | 1.88 | 5.00 | 48 | 8.00 | 8 | 1.25 |
| 4 | 12.25 | 2.13 | 6.19 | 73 | 9.50 | 8 | 1.38 |
| 5 | 14.75 | 2.88 | 7.31 | 140 | 11.50 | 8 | 1.63 |
| 6 | 15.50 | 3.25 | 8.50 | 160 | 12.50 | 12 | 1.50 |
| 8 | 19.00 | 3.63 | 10.63 | 300 | 15.50 | 12 | 1.75 |
| 10 | 23.00 | 4.25 | 12.75 | 510 | 19.00 | 12 | 2.00 |
| 12 | 26.50 | 4.88 | 15.00 | 690 | 22.50 | 16 | 2.13 |
| 14 | 29.50 | 5.25 | 16.25 | 975 | 25.00 | 16 | 2.38 |
| 16 | 32.50 | 5.75 | 18.50 | 1300 | 27.75 | 16 | 2.63 |
| 18 | 36.00 | 6.38 | 21.00 | 1750 | 30.50 | 16 | 2.88 |
| 20 | 38.75 | 7.00 | 23.00 | 2225 | 32.75 | 16 | 3.13 |
| 24 | 46.00 | 8.00 | 27.25 | 3625 | 39.00 | 16 | 3.63 |
| Nominal Pipe Size | Outside Diameter (O) | Thickness (T) | Raised Face Diameter (R) | Approximate Weight (lbs) | Bolt Circle (C) | Number of Holes | Diameter of Holes |
|---|---|---|---|---|---|---|---|
| 1/2 | 5.25 | 1.19 | 1.38 | 7 | 3.50 | 4 | 0.88 |
| 3/4 | 5.50 | 1.25 | 1.69 | 8 | 3.75 | 4 | 0.88 |
| 1 | 6.25 | 1.38 | 2.00 | 11 | 4.25 | 4 | 1.00 |
| 1 1/4 | 7.25 | 1.50 | 2.50 | 17 | 5.13 | 4 | 1.13 |
| 1 1/2 | 8.00 | 1.75 | 2.88 | 23 | 5.75 | 4 | 1.25 |
| 2 | 9.25 | 2.00 | 3.63 | 39 | 6.75 | 8 | 1.13 |
| 2 1/2 | 10.50 | 2.25 | 4.13 | 56 | 7.75 | 8 | 1.25 |
| 3 | 12.00 | 2.63 | 5.00 | 86 | 9.00 | 8 | 1.38 |
| 4 | 14.00 | 3.00 | 6.19 | 135 | 10.75 | 8 | 1.63 |
| 5 | 16.50 | 3.63 | 7.31 | 225 | 12.75 | 8 | 1.88 |
| 6 | 19.00 | 4.25 | 8.50 | 345 | 14.50 | 8 | 2.13 |
| 8 | 21.75 | 5.00 | 10.63 | 530 | 17.25 | 12 | 2.13 |
| 10 | 26.50 | 6.50 | 12.75 | 1025 | 21.25 | 12 | 2.63 |
| 12 | 30.00 | 7.25 | 15.00 | 1300 | 24.38 | 12 | 2.88 |
Forged Blind Flange Standards
These Blind Pipe Flange standards define dimensions, material requirements, pressure ratings, and manufacturing tolerances, ensuring interchangeability, safety, and reliability.
- ASME/ANSI Standards (American):
- ASME B16.5 – Pipe Flanges and Flanged Fittings (NPS 1/2" to 24").
- ASME B16.47 – Large Diameter Steel Flanges (Series A & B, NPS 26" to 60").
- ASME B16.36 – Orifice Flanges.
- ASME B16.48 – Line Blanks (Spectacle, Spade, and Spacer Flanges).
- ANSI B16.1 – Cast Iron Flanges and Flanged Fittings.
- ANSI B16.42 – Ductile Iron Pipe Flanges and Flanged Fittings.
- ISO Standards (International)
- ISO 7005-1 – Steel Flanges for General Applications.
- ISO 7005-2 – Cast Iron Flanges.
- ISO 7005-3 – Copper Alloy Flanges.
- EN Standards (European)
- EN 1092-1 – Steel Flanges.
- EN 1092-2 – Cast Iron Flanges.
- EN 1092-3 – Copper Alloy Flanges.
- EN 1092-4 – Aluminium Alloy Flanges.
- DIN Standards (German)
- DIN 2527 – Blind Flanges.
- DIN 2576 – Slip-On Flanges (PN 10).
- DIN 2633 – Weld Neck Flanges (PN 16).
- DIN 2634 – Weld Neck Flanges (PN 25).
- DIN 2635 – Weld Neck Flanges (PN 40).
- JIS Standards (Japanese)
- JIS B2220 – Steel Pipe Flanges.
- GOST Standards (Russian)
- GOST 12820 – Flat Flanges for Steel Pipe Joints.
- GOST 12821 – Steel Welded Flanges for High-Pressure Applications.
- GOST 33259 – Flange Connections for Industrial Equipment and Pipelines.
- BS Standards (British)
- BS 4504 – Circular Flanges for Pipes, Valves, and Fittings.
- BS 10 – Specification for Flanges and Bolting.
- API Standards (Oil & Gas)
- API 6A – Wellhead and Christmas Tree Equipment Flanges.
- API 605 – Large-Diameter Carbon Steel Flanges (merged into ASME B16.47 Series B).
- AWWA Standards (Waterworks)
- AWWA C207 – Steel Ring Flanges for Waterworks Service.
- MSS Standards (Manufacturer's Standardization Society)
- MSS SP-44 – Steel Pipe Flanges (merged into ASME B16.47 Series A).
- MSS SP-51 – Flanges for Glass-Lined Equipment.
- Material-Specific Standards (ASTM)
- ASTM A105 – Carbon Steel Forged Flanges.
- ASTM A182 – Alloy and Stainless Steel Forged Flanges.
- ASTM A350 – Carbon and Low-Alloy Steel Flanges for Low-Temperature Service.
- ASTM A694 – High-Strength Carbon and Alloy Steel Flanges for High-Pressure Applications.
- Other Regional and Specialized Standards
- KS B1511 – Korean Standard Flanges.
- NF E29-206 – French Standard Flanges.
- SANS 1123 – South African Standard for Steel Flanges.
Why Ample Alloys For Blind Flange!
Ample Alloys provides competitive pricing, on-time delivery, and exceptional after-sales support, making it the preferred choice for high-quality Slip-On Flanges worldwide.
Superior Quality
Ample Alloys manufactures Blind Flanges that meet international standards like ANSI B16.5 and ASME B16.5, ensuring high performance, durability, and leak-proof sealing for your piping systems.
Customization Options
The company provides tailor-made blind flanges to meet specific size, pressure, and material requirements, ensuring compatibility with your unique system needs.
Competitive Pricing
Ample Alloys offers cost-effective solutions without compromising on quality, making it a reliable choice for both small-scale and large-scale projects.
Timely Delivery
Known for efficient production processes and reliable shipping, Ample Alloys ensures timely delivery of blind flanges to meet project deadlines.
Blind flanges are used to close the open ends of pipes, valves, or other equipment in piping systems, providing a safe and secure seal. They are essential for maintenance, inspections, or when a system is temporarily not in use.
Blind flanges are installed by bolting them onto the end of a pipeline or vessel using gaskets for a secure seal. They are typically used where future connections or modifications may be required.
Unlike regular flanges, which have a hole to connect pipes, blind flanges are solid and used to seal off ends or openings in piping systems.
