Process Pipelines
Used to isolate operating sections during maintenance and pressure testing.
Product Detail
Blind Flange
Designed for pipe end isolation, shutdown capability and reliable sealing integrity.
Overview
Built for secure closure and pipeline isolation
Our blind flanges are precision manufactured to seal the end of a piping system or isolate a section during maintenance, testing, and shutdown operations.
- High-integrity sealing for end closures and isolation points.
- Manufactured in accordance with ASME B16.5 dimensional standards.
- Available in multiple materials for chemical, process, and pressure applications.
Technical
Blind Flange specifications
ASME B16.5 – 2020
StandardASME B16.5
Size Range1/2" to 24"
Pressure Class150 to 2500
FinishingRaised / RTJ
| Feature | Details |
|---|---|
| Primary Use | Pipeline end closure and equipment isolation |
| Design Type | Solid blank flange with no bore |
| Sealing Interface | RF / RTJ / FF depending on requirement |
| Operations | Shutdown, maintenance, hydrotesting and isolation |
Dimensions of Class
SPEW-BLRF-1500# Dimensions of Class 1500 Flanges (ANSI B 16.5 - 2020)
| Model Code | Nominal Pipe Size (DN) | Nominal Pipe Size (inch) | Flange Dia | Bolt Circle Dia | Thk of Flange | No of Bolt Holes | Dia of Bolt Holes | Dia of Raised Face |
|---|---|---|---|---|---|---|---|---|
| SPEW-BLRF-1/2*1500# | 15 | 1/2" | 121.0 | 82.6 | 22.2 | 4 | 28.8 | 34.9 |
| SPEW-BLRF-3/4*1500# | 20 | 3/4" | 130.0 | 88.9 | 22.2 | 4 | 31.8 | 42.9 |
| SPEW-BLRF-1*1500# | 25 | 1" | 149.0 | 101.6 | 25.4 | 4 | 35.0 | 50.8 |
| SPEW-BLRF-1.1/4*1500# | 32 | 1.1/4" | 159.0 | 111.1 | 25.4 | 4 | 35.0 | 63.5 |
| SPEW-BLRF-1.1/2*1500# | 40 | 1.1/2" | 178.0 | 124.0 | 28.6 | 4 | 38.2 | 73.0 |
| SPEW-BLRF-2*1500# | 50 | 2" | 216.0 | 165.1 | 25.4 | 8 | 34.5 | 92.1 |
| SPEW-BLRF-2.1/2*1500# | 65 | 2.1/2" | 244.0 | 190.5 | 28.6 | 8 | 47.5 | 104.8 |
| SPEW-BLRF-3*1500# | 80 | 3" | 267.0 | 203.2 | 31.7 | 8 | 54.2 | 127.0 |
| SPEW-BLRF-4*1500# | 100 | 4" | 311.0 | 241.3 | 34.9 | 8 | 60.2 | 157.2 |
| SPEW-BLRF-5*1500# | 125 | 5" | 375.0 | 292.1 | 41.3 | 8 | 79.6 | 185.7 |
| SPEW-BLRF-6*1500# | 150 | 6" | 434.0 | 317.5 | 38.1 | 12 | 89.0 | 215.9 |
| SPEW-BLRF-8*1500# | 200 | 8" | 495.0 | 381.0 | 44.5 | 12 | 98.6 | 269.7 |
| SPEW-BLRF-10*1500# | 250 | 10" | 584.0 | 482.6 | 50.8 | 12 | 111.4 | 323.8 |
| SPEW-BLRF-12*1500# | 300 | 12" | 673.0 | 571.5 | 54.0 | 16 | 130.4 | 381.0 |
SPEW-BLRF-2500# Dimensions of Class 2500 Flanges (ANSI B 16.5 - 2020)
| Model Code | Nominal Pipe Size (DN) | Nominal Pipe Size (inch) | Flange Dia | Bolt Circle Dia | Thk of Flange | No of Bolt Holes | Dia of Bolt Holes | Dia of Raised Face |
|---|---|---|---|---|---|---|---|---|
| SPEW-BLRF-1/2*2500# | 15 | 1/2" | 133.0 | 88.9 | 22.2 | 4 | 36.6 | 34.9 |
| SPEW-BLRF-3/4*2500# | 20 | 3/4" | 140.0 | 95.2 | 22.2 | 4 | 38.2 | 42.9 |
| SPEW-BLRF-1*2500# | 25 | 1" | 159.0 | 108.0 | 25.4 | 4 | 41.5 | 50.8 |
| SPEW-BLRF-1.1/4*2500# | 32 | 1.1/4" | 184.0 | 130.0 | 28.6 | 4 | 44.5 | 63.5 |
| SPEW-BLRF-1.1/2*2500# | 40 | 1.1/2" | 203.0 | 146.0 | 31.7 | 4 | 50.8 | 73.0 |
| SPEW-BLRF-2*2500# | 50 | 2" | 235.0 | 171.4 | 28.6 | 8 | 57.2 | 92.1 |
| SPEW-BLRF-2.1/2*2500# | 65 | 2.1/2" | 267.0 | 196.8 | 31.7 | 8 | 63.6 | 104.8 |
| SPEW-BLRF-3*2500# | 80 | 3" | 305.0 | 228.6 | 34.9 | 8 | 72.9 | 127.0 |
| SPEW-BLRF-4*2500# | 100 | 4" | 356.0 | 273.0 | 41.3 | 8 | 82.6 | 157.2 |
| SPEW-BLRF-5*2500# | 125 | 5" | 419.0 | 323.8 | 47.6 | 8 | 98.3 | 185.7 |
| SPEW-BLRF-6*2500# | 150 | 6" | 483.0 | 368.3 | 54.0 | 8 | 114.4 | 215.9 |
| SPEW-BLRF-8*2500# | 200 | 8" | 552.0 | 438.2 | 54.0 | 12 | 133.4 | 269.7 |
| SPEW-BLRF-10*2500# | 250 | 10" | 673.0 | 539.8 | 66.7 | 12 | 171.5 | 323.8 |
| SPEW-BLRF-12*2500# | 300 | 12" | 762.0 | 619.3 | 73.0 | 12 | 190.6 | 381.0 |
SPEW-BLRF-150# Dimensions of Class 150 Flanges (ANSI B 16.5 - 2020)
| Model Code | Nominal Pipe Size (DN) | Nominal Pipe Size (inch) | Flange Dia | Bolt Circle Dia | Thk of Flange | No of Bolt Holes | Dia of Bolt Holes | Dia of Raised Face |
|---|---|---|---|---|---|---|---|---|
| SPEW-BLRF-1/2*150# | 15 | 1/2" | 89.0 | 60.5 | 15.9 | 4 | 11.3 | 34.9 |
| SPEW-BLRF-3/4*150# | 20 | 3/4" | 99.0 | 69.8 | 15.9 | 4 | 12.8 | 42.9 |
| SPEW-BLRF-1*150# | 25 | 1" | 108.0 | 79.2 | 15.9 | 4 | 14.3 | 50.8 |
| SPEW-BLRF-1.1/4*150# | 32 | 1.1/4" | 117.0 | 88.9 | 15.9 | 4 | 15.8 | 63.5 |
| SPEW-BLRF-1.1/2*150# | 40 | 1.1/2" | 127.0 | 98.4 | 15.9 | 4 | 17.5 | 73.0 |
| SPEW-BLRF-2*150# | 50 | 2" | 152.0 | 120.6 | 19.0 | 4 | 19.0 | 92.1 |
| SPEW-BLRF-2.1/2*150# | 65 | 2.1/2" | 178.0 | 139.7 | 19.0 | 4 | 22.2 | 104.8 |
| SPEW-BLRF-3*150# | 80 | 3" | 190.0 | 152.4 | 19.0 | 4 | 23.9 | 127.0 |
| SPEW-BLRF-4*150# | 100 | 4" | 229.0 | 190.5 | 19.0 | 8 | 23.9 | 157.2 |
| SPEW-BLRF-5*150# | 125 | 5" | 254.0 | 215.9 | 22.2 | 8 | 23.9 | 185.7 |
| SPEW-BLRF-6*150# | 150 | 6" | 279.0 | 241.3 | 22.2 | 8 | 25.4 | 215.9 |
| SPEW-BLRF-8*150# | 200 | 8" | 343.0 | 298.5 | 22.2 | 8 | 30.2 | 269.7 |
| SPEW-BLRF-10*150# | 250 | 10" | 406.0 | 362.0 | 28.6 | 12 | 30.2 | 323.8 |
| SPEW-BLRF-12*150# | 300 | 12" | 457.0 | 431.8 | 28.6 | 12 | 31.8 | 381.0 |
| SPEW-BLRF-14*150# | 350 | 14" | 508.0 | 476.3 | 28.6 | 12 | 34.9 | 412.8 |
| SPEW-BLRF-16*150# | 400 | 16" | 559.0 | 539.8 | 28.6 | 16 | 36.6 | 469.9 |
| SPEW-BLRF-18*150# | 450 | 18" | 610.0 | 577.9 | 31.7 | 16 | 39.7 | 553.4 |
| SPEW-BLRF-20*150# | 500 | 20" | 660.0 | 635.0 | 31.7 | 20 | 42.9 | 584.2 |
| SPEW-BLRF-24*150# | 600 | 24" | 813.0 | 749.3 | 34.9 | 20 | 47.6 | 692.2 |
SPEW-BLRF-300# Dimensions of Class 300 Flanges (ANSI B 16.5 - 2020)
| Model Code | Nominal Pipe Size (DN) | Nominal Pipe Size (inch) | Flange Dia | Bolt Circle Dia | Thk of Flange | No of Bolt Holes | Dia of Bolt Holes | Dia of Raised Face |
|---|---|---|---|---|---|---|---|---|
| SPEW-BLRF-1/2*300# | 15 | 1/2" | 95.0 | 66.5 | 15.9 | 4 | 14.3 | 34.9 |
| SPEW-BLRF-3/4*300# | 20 | 3/4" | 117.0 | 68.3 | 15.9 | 4 | 15.7 | 42.9 |
| SPEW-BLRF-1*300# | 25 | 1" | 124.0 | 88.9 | 19.0 | 4 | 17.2 | 50.8 |
| SPEW-BLRF-1.1/4*300# | 32 | 1.1/4" | 133.0 | 98.6 | 19.0 | 4 | 15.1 | 63.5 |
| SPEW-BLRF-1.1/2*300# | 40 | 1.1/2" | 133.0 | 114.3 | 22.2 | 4 | 20.7 | 73.0 |
| SPEW-BLRF-2*300# | 50 | 2" | 165.0 | 127.0 | 19.0 | 8 | 22.3 | 92.1 |
| SPEW-BLRF-2.1/2*300# | 65 | 2.1/2" | 190.0 | 149.4 | 22.2 | 8 | 25.4 | 104.8 |
| SPEW-BLRF-3*300# | 80 | 3" | 210.0 | 168.1 | 22.2 | 8 | 28.6 | 127.0 |
| SPEW-BLRF-4*300# | 100 | 4" | 299.0 | 200.2 | 22.2 | 8 | 31.7 | 157.2 |
| SPEW-BLRF-5*300# | 125 | 5" | 279.0 | 235.0 | 22.2 | 8 | 34.8 | 185.7 |
| SPEW-BLRF-6*300# | 150 | 6" | 318.0 | 269.7 | 22.2 | 12 | 38.6 | 215.9 |
| SPEW-BLRF-8*300# | 200 | 8" | 381.0 | 330.2 | 25.4 | 12 | 41.1 | 269.7 |
| SPEW-BLRF-10*300# | 250 | 10" | 444.0 | 387.4 | 28.6 | 16 | 47.5 | 323.8 |
| SPEW-BLRF-12*300# | 300 | 12" | 521.0 | 450.8 | 31.7 | 16 | 50.8 | 381.0 |
| SPEW-BLRF-14*300# | 350 | 14" | 584.0 | 514.4 | 31.7 | 20 | 53.8 | 412.8 |
| SPEW-BLRF-16*300# | 400 | 16" | 648.0 | 571.5 | 34.9 | 20 | 57.1 | 469.9 |
| SPEW-BLRF-18*300# | 450 | 18" | 711.0 | 628.6 | 34.9 | 24 | 60.2 | 553.4 |
| SPEW-BLRF-20*300# | 500 | 20" | 775.0 | 685.8 | 34.9 | 24 | 63.5 | 584.2 |
| SPEW-BLRF-24*300# | 600 | 24" | 914.0 | 812.8 | 41.3 | 24 | 69.8 | 692.2 |
SPEW-BLRF-600# Dimensions of Class 600 Flanges (ANSI B 16.5 - 2020)
| Model Code | Nominal Pipe Size (DN) | Nominal Pipe Size (inch) | Flange Dia | Bolt Circle Dia | Thk of Flange | No of Bolt Holes | Dia of Bolt Holes | Dia of Raised Face |
|---|---|---|---|---|---|---|---|---|
| SPEW-BLRF-1/2*600# | 15 | 1/2" | 95.0 | 66.5 | 15.9 | 4 | 20.6 | 34.9 |
| SPEW-BLRF-3/4*600# | 20 | 3/4" | 117.0 | 82.6 | 19.0 | 4 | 22.1 | 42.9 |
| SPEW-BLRF-1*600# | 25 | 1" | 124.0 | 88.9 | 19.0 | 4 | 23.9 | 50.8 |
| SPEW-BLRF-1.1/4*600# | 32 | 1.1/4" | 133.0 | 98.6 | 19.0 | 4 | 27.0 | 63.5 |
| SPEW-BLRF-1.1/2*600# | 40 | 1.1/2" | 155.0 | 114.3 | 22.2 | 4 | 28.8 | 73.0 |
| SPEW-BLRF-2*600# | 50 | 2" | 165.0 | 127.0 | 19.0 | 8 | 31.8 | 92.1 |
| SPEW-BLRF-2.1/2*600# | 65 | 2.1/2" | 190.0 | 149.4 | 22.2 | 8 | 34.8 | 104.8 |
| SPEW-BLRF-3*600# | 80 | 3" | 210.0 | 168.1 | 22.2 | 8 | 38.2 | 127.0 |
| SPEW-BLRF-4*600# | 100 | 4" | 273.0 | 215.9 | 25.4 | 8 | 34.5 | 157.2 |
| SPEW-BLRF-5*600# | 125 | 5" | 330.0 | 266.7 | 28.6 | 8 | 50.8 | 185.7 |
| SPEW-BLRF-6*600# | 150 | 6" | 356.0 | 292.1 | 28.6 | 12 | 54.2 | 215.9 |
| SPEW-BLRF-8*600# | 200 | 8" | 419.0 | 349.2 | 34.9 | 12 | 62.8 | 269.7 |
| SPEW-BLRF-10*600# | 250 | 10" | 508.0 | 431.8 | 34.9 | 16 | 69.9 | 323.8 |
| SPEW-BLRF-12*600# | 300 | 12" | 609.0 | 489.0 | 34.9 | 20 | 72.0 | 381.0 |
| SPEW-BLRF-14*600# | 350 | 14" | 698.0 | 527.0 | 38.1 | 20 | 76.2 | 412.8 |
| SPEW-BLRF-16*600# | 400 | 16" | 698.0 | 603.2 | 41.3 | 20 | 82.6 | 469.9 |
| SPEW-BLRF-18*600# | 450 | 18" | 745.0 | 654.0 | 44.4 | 20 | 89.0 | 553.4 |
| SPEW-BLRF-20*600# | 500 | 20" | 813.0 | 723.9 | 44.4 | 24 | 95.3 | 584.2 |
| SPEW-BLRF-24*600# | 600 | 24" | 940.0 | 650.2 | 50.8 | 24 | 108.0 | 692.2 |
SPEW-BLRF-900# Dimensions of Class 900 Flanges (ANSI B 16.5 - 2020)
| Model Code | Nominal Pipe Size (DN) | Nominal Pipe Size (inch) | Flange Dia | Bolt Circle Dia | Thk of Flange | No of Bolt Holes | Dia of Bolt Holes | Dia of Raised Face |
|---|---|---|---|---|---|---|---|---|
| SPEW-BLRF-1/2*900# | 15 | 1/2" | 121.0 | 82.6 | 22.2 | 4 | 28.8 | 34.9 |
| SPEW-BLRF-3/4*900# | 20 | 3/4" | 130.0 | 88.9 | 22.2 | 4 | 31.8 | 42.9 |
| SPEW-BLRF-1*900# | 25 | 1" | 149.0 | 101.6 | 25.4 | 4 | 35.0 | 50.8 |
| SPEW-BLRF-1.1/4*900# | 32 | 1.1/4" | 159.0 | 111.1 | 25.4 | 4 | 35.0 | 63.5 |
| SPEW-BLRF-1.1/2*900# | 40 | 1.1/2" | 178.0 | 124.0 | 28.6 | 4 | 38.2 | 73.0 |
| SPEW-BLRF-2*900# | 50 | 2" | 216.0 | 165.1 | 25.4 | 8 | 34.5 | 92.1 |
| SPEW-BLRF-2.1/2*900# | 65 | 2.1/2" | 244.0 | 190.5 | 28.6 | 8 | 47.5 | 104.8 |
| SPEW-BLRF-3*900# | 80 | 3" | 241.0 | 190.5 | 25.4 | 8 | 44.5 | 127.0 |
| SPEW-BLRF-4*900# | 100 | 4" | 292.0 | 235.0 | 31.7 | 8 | 50.9 | 157.2 |
| SPEW-BLRF-5*900# | 125 | 5" | 349.0 | 279.4 | 35.0 | 8 | 57.2 | 185.7 |
| SPEW-BLRF-6*900# | 150 | 6" | 381.0 | 317.5 | 31.7 | 12 | 62.0 | 215.9 |
| SPEW-BLRF-8*900# | 200 | 8" | 470.0 | 393.7 | 38.1 | 12 | 69.9 | 269.7 |
| SPEW-BLRF-10*900# | 250 | 10" | 546.0 | 469.9 | 38.1 | 16 | 76.2 | 323.8 |
| SPEW-BLRF-12*900# | 300 | 12" | 610.0 | 533.4 | 38.1 | 20 | 85.6 | 381.0 |
Applications
Where blind flanges are used
Oil & Gas
Suitable for critical system closure points in upstream and downstream operations.
Power Systems
Provides secure end closure for pressurized lines and utility networks.