Blind Flange / BLRF Flange

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Manufacturers of ASME/ANSI B16.5, B16.47 Blind Flange

A Blind Flange is a solid flange used to seal the end of a pipeline, valve, or pressure vessel. Unlike other flanges, it does not contain a center bore, making it ideal for completely closing a piping system and preventing the flow of liquids or gases. Blind flanges are widely used in industries such as oil & gas, petrochemical, chemical processing, water treatment, and power generation where secure sealing and pressure control are important. They are available in different materials including Stainless Steel, Carbon Steel, Alloy Steel, and Duplex Steel, along with various pressure ratings and sizes to meet industrial requirements.

Blind Raised Face Flanges are designed with a raised sealing surface that provides stronger gasket support and better leak-proof performance. These flanges are commonly used for maintenance, inspection, testing, and future pipeline expansion, allowing systems to be safely closed when required. Their strong sealing capability helps maintain system integrity, prevents pressure loss, and reduces the risk of leakage or contamination in high-pressure and high-temperature applications.

Arrow Piping Solutions is a trusted manufacturer, supplier, and exporter of high-quality Blind Flanges manufactured according to international standards and industry specifications. Our blind flanges are known for their excellent strength, dimensional accuracy, corrosion resistance, and long service life. We offer a wide range of Blind Flanges in different materials, sizes, and pressure classes to suit various industrial applications. With strict quality control, advanced manufacturing processes, competitive pricing, and timely delivery, Arrow Piping Solutions provides reliable and cost-effective flange solutions to customers worldwide.

Long Weld Neck Flange

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

STANDARDS / DIMENSION

ANSI/ASME B16.5, B 16.47 Series A & B, B16.48, BS4504, BS 10, EN-1092, DIN

PRESSURE CLASS

150#, 300#, 600#, 900#, 1500#, 2500#, PN6, PN10, PN16, PN25, PN40, PN64.

FLANGE FACE TYPE

FF—Flat Face, RF—Raised Face, FM—Female Face, M—Male Face, T—Tongue Face, G—Groove Face, RJ—Ring Joint.

CARBON STEEL

ASTM A105/A105N (SA105N), LTCS A350 LF2, A694

DUPLEX & SUPER DUPLEX

ASTM A182 / ASME SA182 - S31803, S32205, 2205, S32750, S32760, S32950, 2507.

STAINLESS STEEL

ASTM A182 F304, 304L, 304H, 316, 316L, 316H, 317, 317L, 321, 321H, 310, 310S, 347, 904L, etc.

ALLOY STEEL

ASTM A182 / SA182 - F1 / F5 / F9 / F11 / F12 / F22 / F91

MTC

EN 10204 3.2 and EN 10204 3.1, Test Certificates certifying NACE MR0175, NACE MR0103

Flanges ANSI/ASME B16.5 & B16.47
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Materials

➜
Stainless Steel ➜ Carbon Steel ➜ Alloy Steel ➜
Weld Neck Flange Diagram

ASME B16.5 BLIND FLANGE - (NPS 1/2 TO 24, CLASS 150) - DIMENSIONS & WEIGHT

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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

ASME B16.5 BLIND FLANGE - (NPS 1/2 TO 24, CLASS 300) - DIMENSIONS & WEIGHT

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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

ASME B16.5 BLIND FLANGE - (NPS 1/2 TO 24, CLASS 400) - DIMENSIONS & WEIGHT

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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

ASME B16.5 BLIND FLANGE - (NPS 1/2 TO 24, CLASS 600) - DIMENSIONS & WEIGHT

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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

ASME B16.5 BLIND FLANGE - (NPS 1/2 TO 24, CLASS 900) - DIMENSIONS & WEIGHT

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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

ASME B16.5 BLIND FLANGE - (NPS 1/2 TO 24, CLASS 1500) - DIMENSIONS & WEIGHT

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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

ASME B16.5 BLIND FLANGE - (NPS 1/2 TO 24, CLASS 2500) - DIMENSIONS & WEIGHT

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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

Forged Blind Flange Standards

These Blind Pipe Flange standards define dimensions, material requirements, pressure ratings, and manufacturing tolerances, ensuring interchangeability, safety, and reliability.

1. 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.

2. ISO Standards (International)

  • ISO 7005-1 – Steel Flanges for General Applications.
  • ISO 7005-2 – Cast Iron Flanges.
  • ISO 7005-3 – Copper Alloy Flanges.

3. 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.

4. 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).

5. JIS Standards (Japanese)

  • JIS B2220 – Steel Pipe Flanges.

6. 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.

7. BS Standards (British)

  • BS 4504 – Circular Flanges for Pipes, Valves, and Fittings.
  • BS 10 – Specification for Flanges and Bolting.

8. 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).

9. AWWA Standards (Waterworks)

  • AWWA C207 – Steel Ring Flanges for Waterworks Service.

10. 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.

11. 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.

12. 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 Arrow Piping Solutions For BLIND FLANGE!

Arrow Piping Solutions 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

Arrow Piping Solutions manufactures premium quality Blind Flanges in compliance with international standards such as ASME B16.5 and ANSI B16.5. Our flanges are designed for excellent durability, precise dimensions, and reliable leak-proof performance in demanding industrial applications.

Customization Facility

We provide Blind Flanges in customized sizes, pressure ratings, materials, and specifications to match the exact requirements of different piping systems and industrial projects. Our solutions are tailored to ensure perfect compatibility and efficient performance.

Cost-Effective Solutions

Arrow Piping Solutions offers high-quality Blind Flanges at competitive market prices without compromising on product standards. Our affordable pricing structure makes us a preferred choice for both small and large industrial requirements.

On-Time Delivery

With advanced manufacturing capabilities and a strong distribution network, we ensure the timely delivery of Blind Flanges to clients across domestic and international markets, helping projects stay on schedule.

Why Are Blind Flanges Used?

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Blind Flanges are used to seal the end of pipes, valves, or pressure vessels in a piping system.

They provide a secure closure that helps during maintenance, inspection, pressure testing, or temporary shutdown of the system while preventing leakage and contamination.

How Are Blind Flanges Installed?

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Blind Flanges are installed by aligning them with the matching flange connection and securing them using bolts and gaskets.

Proper tightening ensures a strong and leak-resistant seal within the piping system.

Difference Between Blind Flanges and Regular Flanges

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Regular flanges are designed with a center opening to allow the flow of fluids through connected pipes, whereas Blind Flanges are completely solid and used to close or isolate sections of a piping system safely and effectively.

AVAILABLE TYPES OF FLANGES

TONGUE AND GROOVE FLANGES

MALE AND FEMALE FLANGES

WELD NECK FLANGES

BLIND FLANGES

Orifice Flange

Socket Weld Flange / SWRF Flange