Blind Flange

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$USD 20 $18

Sealing Face: RF, FF, RTJ Size Range: 1/2" - 60" / DN15 - DN1200 Pressure Rating: Class 150, 300, 600, 900, 1500, 2500

SKU: ZZ107 Category:

 What is Blind Flange

Blind flange is a solid flange the purpose of these is to block off a section of pipe. Unlike other types of flange that are used to connect pipes or components, it is used to close off a pipe or an opening in a system. They are serve a crucial role in maintaining the integrity of piping systems, preventing leaks, and enabling safe pressure testing.

Similar to other type flanges, blind flange has mounting holes around the perimeter and the gasket sealing rings are machined into the mating surface. The difference is that a blind flange has no opening for fluids to pass through.

ASME B16.5 Forged Blind Flange

ASME B16.5 is American standard for manufacturing cast and forged steel pipe flange. This standard included flanges and flange fittings made from cast or forged materials, and blind flanges and certain reducing flanges made from cast, forged, or plate materials. Also included in this standard are requirements and recommendations regarding flange bolting, flange gaskets, and flange joints. B16.5 cover the dimension, tolerance,weight of the flanges.

Sealing Face RF, FF, FTJ
Size Range 1/2″ – 60″ / DN15 – DN1500
Pressure Rating Class 150, 300, 600, 900, 1500, 2500lb
Standard ASME / ANSI B16.5, ASME B16.47 Series A/B

Sealing Face for Blind Flange

The raised face (RF) is the most common type of flange facing used. These flanges are widely used in oil and gas pipelines.

RF Blind Flange

Flat face (FF) flanges are similar to the RF flanges. But they do not have the raised area like the RF flange. Instead, the whole surface is flat.

FF BL Flange

A Ring type joint flange(RTJ) is a machined metallic ring with a deep groove cut into its face. This groove rests a metal ring which gets compressed when the connecting bolts of the flange are tightened.

RTJ BL

Face Finish

However, the common objective of any type of flange face finish is to create the desired roughness on the face of a flange to ensure a strong match between the flange, the gasket, and the mating flange thus provide a high-quality seal.

The roughness are different for different face finish. It is available for various gasket for different roughness.

Surface Types Maximum Roughness Value
Ring-type joint flanges 63 µin AARH (1.6 µm AARH)
Spiral wound gaskets 125 to 250 µin AARH (3.2 to 6.3 µm AARH)
Soft gaskets. 250 to 500 µin AARH (6.3 to 12.6 µm AARH)
Tongue and Groove 125 µ.in. or 3.2 µ.m AARH

Material for Forged Steel Flange

We are specialized in various steel flanges, the materials including carbon steel, alloy steel and stainless steel.

Carbon Steel ASTM A105 / A105N, ASTM A350 LF2/LF3, ASTM A694 F42 / 46 / 56 / 60 / 65, P235GH, P265GH, P280GH, P355GH
Alloy Steel ASTM A182 F11 / 12 / 5 / 9 / 91 / 92
Stainless Steel ASTM A182 F304/304L/304H, 316/316L, 321, 310S, 317,347,904L， 1.4404, 1.4437.
Duplex Stainless Steel ASTM A182 F51, F53, F55

Carbon steel flange, that is, the body material is carbon steel plate or end flange connection. Stainless steel flange, also called SS flange, it means the material of flange is stainless steel. Common material standards and Grades are ASTM A182 Grade F304/L and F316/L. It used in more industries than carbon steel. Stainless steel has better resistant performances on corrosion environment and always provides with a good appearance.

Advantages of Forged Blind Flange

There is no hole in the center of the blind flange, so it can seal the pipeline. Without blind flanges, shutdowns and repairs would be incredibly difficult to handle. Stainless steel blind flange have the following advantages.

Resistant to corrosion and staining

Low maintenance

Bright familiar luster

Steel Strength

Dimension and Weight

Dimension of ASME B16.5 blind flanges are in 1/2″ to 24″ nominal sizes. The pressure of Class 150#, 300#, 400#, 600#, 900#, 1500#, and 2500# . There are many seal facing as raised face (RF), flat face (FF), ring type joint (RTJ) , tongue-and-groove (T&G) and male-and-female (M&F).

CLASS150
Norminal Pipe Size A C G H I J Weight
mm mm mm mm Number of
Holes		 mm mm kg/piece
1/2 21.3 88.9 11.2 35. 10 4 15.7 60.45 0.42
3/4 26.7 98.6 12.7 42.9 4 15.7 69.85 0.61
1 33.4 108 14.2 50.8 4 15.7 79.25 0.86
11/4 42.2 117.3 15.7 63.5 4 15.7 88.9 1.17
11/2 48.3 127 17.5 73. 15 4 15.7 98.6 1.53
2 60.3 152.4 19. 10 91.9 4 19.1 120.7 2.42
21/2 73.0 177.8 22.4 104.6 4 19.1 139.7 3.94
3 88.9 190.5 23.9 127 4 19.1 152.4 4.93
31/2 101.6 215.9 23.9 139.7 8 19.1 177.8 6.17
4 114.3 228.6 23.9 157.2 8 19.1 190.5 7.00
5 141.3 254 23.9 185.7 8 22.4 215.9 8.63
6 168.3 279.4 25.4 215.9 8 22.4 241.3 11.3
8 219.1 342.9 28.4 269.7 8 22.4 298.5 19.6
10 273.0 406.4 30.2 323.9 12 25.4 362 28.8
12 323.8 482.6 31.75 381 12 25.4 431.8 43.2
14 355.6 533.4 35. 10 412.8 12 28.4 476.3 58.1
16 406.4 596.9 36.6 469.9 16 28.4 539.8 76.0
18 457.2 635 39.6 533.4 16 31.75 577.9 93.7
20 508.0 698.5 42.9 584.2 20 31.75 635 122
24 609.6 812.8 47.8 692.2 20 35.1 749.3 185

 

Class 300
Nominal
Pipe Size		 A C G H I J Weight
mm mm mm mm Number of
Holes		 mm mm kg/piece
1/2 21.3 95.2 14.2 35.1 4 15.7 66.55 0.64
3/4 26.7 117.3 15.7 42.9 4 19 82.5 1.11
1 33.4 123.9 17.5 50.8 4 19 88.9 1.39
11/4 42.2 133.3 19 63.5 4 19 98.5 1.79
11/2 48.3 155.4 20.6 73.15 4 22.3 114.3 2.66
2 60.3 165. 1 22.3 91.9 8 19. 10 127 3.18
21/2 73.0 190.5 25.4 104.6 8 22.3 1.493 4.85
3 88.9 209.5 28.4 127 8 22.3 168.1 6.81
31/2 101.6 228.6 30.2 139.7 8 22.3 184.1 8.71
4 114.3 254 31.7 157.2 8 22.3 200.1 11.50
5 141.3 279.4 35 185.7 8 22.3 234.9 15.60
6 168.3 317.5 36.5 215.9 12 22.3 269.7 20.9
8 219. 1 381 41.1 269.7 12 25.4 330.2 34.3
10 273.0 444.5 47.7 323.9 16 28.4 387.3 53.3
12 323.8 520.7 50.8 381 16 31.7 450.8 78.8
14 355.6 584.2 53.8 412.8 20 31.7 514.3 105.0
16 406.4 647.7 57.15 469.9 20 35 571.5 137.0
18 457.2 711.2 60.45 533.4 24 35 628.6 175.0
20 508.0 774.7 63.5 584.2 24 35 685.8 221
24 609.6 914.4 69.85 692.2 24 41. 10 812.8 339

 

CLASS400
Nominal
Pipe Size		 Outside
Diameter		 Overall
Diameter		 Flange
Thickness
min		 Face
Diameter		 Number of
Holes		 Bolt Hole
Diameter		 Diameter
of Circle of
Holes		 kg/piece
mm mm mm mm mm mm
1/2 21.3 95.2 14.2 35. 10 4 15.7 66.55 0.76
3/4 26.7 117.3 15.7 42.9 4 19.1 82.6 1.28
1 33.4 123.9 17.5 50.8 4 19.1 88.9 1.60
11/4 42.2 133.3 20.6 63.5 4 19.1 98.6 2.23
11/2 48.3 155.4 22.3 73. 15 4 22.4 114.3 3.25
2 60.3 165.1 25.4 91.9 8 19.1 127 4.15
21/2 73 190.5 28.4 104.6 8 22.4 149.4 6.13
3 88.9 209.5 31.7 127 8 22.4 168.1 8.44
31/2 101.6 228.6 35 139.7 8 25.4 184.2 11.00
4 114.3 254 35. 10 157.2 8 25.4 200.2 13.70
5 141.3 279.4 38. 10 185.7 8 25.4 235 18.50
6 168.3 317.5 41. 10 215.9 12 25.4 269.7 25.50
8 219.1 381 47.8 269.7 12 28.4 330.2 42.6
10 273 444.5 53.8 323.9 16 31.75 387.4 64.5
12 323.8 520.7 57. 15 381 16 35.1 450.9 94.3
14 355.6 584.2 60.45 412.8 20 35.1 514.4 124.0
16 406.4 647.7 63.5 469.9 20 38.1 571.5 162.0
18 457.2 711.2 66.55 533.4 24 38.1 628.7 205.0
20 508 774.7 69.85 584.2 24 41.1 685.8 254.0
24 609.6 914.4 76.2 692.2 24 47.8 812.8 386

 

CLASS600
Nominal
Pipe Size		 A C G H I J Weight
Outside
Diameter		 Overall
Diameter		 Flange
Thickness
min		 Face
Diameter		 Number of
Holes		 Bolt Hole
Diameter		 Diameter
of Circle of
Holes		 kg/piece
mm mm mm mm mm mm
1/2 21.3 95.2 14.2 35.1 4 15.7 66.55 0.76
3/4 26.7 117.3 15.7 42.9 4 19. 10 82.6 1.28
1 33.4 123.9 17.5 50.8 4 19. 10 88.9 1.60
11/4 42.2 133.3 20.6 63.5 4 19. 10 98.6 2.23
11/2 48.3 155.4 22.3 73.15 4 22.4 114.3 3.25
2 60.3 165. 1 25.4 91.9 8 19. 10 127 4.15
21/2 73 190.5 28.4 104.6 8 22.4 149.4 6.13
3 88.9 209.5 31.7 127 8 22.4 168.1 8.44
31/2 101.6 228.6 35 139.7 8 25.4 184.2 11.0
4 114.3 273. 1 38.1 157.2 8 25.4 215.9 17.3
5 141.3 330.2 44.5 185.7 8 28.4 266.7 29.4
6 168.3 355.6 47.8 215.9 12 28.4 292.1 36.1
8 219. 1 419. 1 55.6 269.7 12 31.75 349.3 58.9
10 273 508 63.5 323.9 16 35. 10 431.8 97.5
12 323.8 558.8 66.55 381 20 35. 10 489 124
14 355.6 603.3 69.85 412.8 20 38. 10 527.1 151
16 406.4 685.8 76.2 469.9 20 41. 10 603.3 214
18 457.2 743 82.6 533.4 20 44.5 654.1 272
20 508.0 812.8 88.9 584.2 24 44.5 723.9 349
24 609.6 939.8 101.6 692.2 24 50.8 838.2 533

 

Class 900 lb
Nominal
Pipe Size		 A C G H I J Weight
Outside
Diameter		 Overall
Diameter		 Flange
Thickness
min		 Face
Diameter		 Number of
Holes		 Bolt Hole
Diameter		 Diameter
of Circle of
Holes		 kg/piece
mm mm mm mm mm mm
1/2 21.3 120.6 22.3 35. 10 4 22.3 82.5 1.77
3/4 26.7 130 25.4 42.9 4 22.3 88.9 2.42
1 33.4 149.3 28.4 50.8 4 25.4 101.6 3.57
11/4 42.2 158.7 28.4 63.5 4 25.4 111.2 4.15
11/2 48.3 177.8 31.7 73. 15 4 28.4 123.9 5.75
2 60.3 215.9 38. 10 91.9 8 25.4 165.1 10.1
21/2 73 244.3 41. 10 104.6 8 28.4 190.5 14.0
3 88.9 241.3 38. 10 127 8 25.4 190.5 13.1
4 114.3 292.1 44.5 157.2 8 31.7 234.9 26.9
5 141.3 349.2 50.8 185.7 8 35 279.4 36.5
6 168.3 381 55.6 215.9 12 31.7 317 47.40
8 219.1 469.9 63.5 269.7 12 38.1 393.7 82.5
10 273 546.1 69.85 323.9 16 38.1 469.9 122
12 323.8 609.6 79.25 381 20 38.1 533.4 173
14 355.6 641.3 85.8 412.8 20 41.1 558.8 206
16 406.4 704.8 88.9 469.9 20 44.4 615.9 259
18 457.2 787.4 101.6 533.4 20 50.8 685.8 367
20 508 857.2 107.9 584.2 20 53.8 749.3 463
24 609.6 1041.4 139.7 692.2 20 66.55 901.7 876

 

Class 1500 lb
Nominal
Pipe Size		 A C G H I J Weight
Outside
Diameter		 Overall
Diameter		 Flange
Thickness
min		 Face
Diameter		 Number of
Holes		 Bolt Hole
Diameter		 Diameter
of Circle of
Holes		 kg/piece
mm mm mm mm mm mm
1/2 21.3 120.6 22.3 35.1 4 22.3 82.5 1.77
3/4 26.7 130 25.4 42.9 4 22.3 88.9 2.42
1 33.4 149.3 28.4 50.8 4 25.4 101.6 3.57
11/4 42.2 158.7 28.4 63.5 4 25.4 111.2 4.15
11/2 48.3 177.8 31.7 73.15 4 28.4 123.9 5.75
2 60.3 215.9 38.1 91.9 8 25.4 165.1 10.1
21/2 73 244.3 41.1 104.6 8 28.4 190.5 14.0
3 88.9 266.7 47.7 127 8 31.7 203.2 19.1
4 114.3 311.1 53.8 157.2 8 35 241.3 29.9
5 141.3 374.6 73.15 185.7 8 41.1 292.1 58.4
6 168.3 393.7 82.5 215.9 12 38.1 317.5 71.8
8 219. 1 482.6 91.9 269.7 12 44.4 393.7 122
10 273 584.2 107.9 323.9 12 50.8 482.6 210
12 323.8 673. 1 123.9 381 16 53.8 571.5 316
14 355.6 749.3 133.3 412.8 16 60.45 635 420
16 406.4 825.5 146 469.9 16 66.55 704.8 558
18 457.2 914.4 162 533.4 16 73. 15 774.7 760
20 508 984.2 177.8 584.2 16 79.25 831.8 965
24 609.6 1168.4 203.2 692.2 16 91.9 990.6 1558

 

Class 2500 lb
Nominal
Pipe Size		 A C G H I J Weight
Outside
Diameter		 Overall
Diameter		 Flange
Thickness
min		 Face
Diameter		 Number of
Holes		 Bolt Hole
Diameter		 Diameter
of Circle of
Holes		 kg/piece
mm mm mm mm mm mm
1/2 21.3 133.4 30.2 35. 10 4 22.4 88.9 2.99
3/4 26.7 139.7 31.7 42.9 4 22.4 95.3 3.50
1 33.4 158.8 35. 10 50.8 4 25.4 108 4.96
11/4 42.2 184.2 38. 10 63.5 4 28.4 130 7.35
11/2 48.3 203.2 44.5 73. 15 4 31.75 146.1 10.4
2 60.3 235 50.8 91.9 8 28.4 171.5 15.6
21/2 73 266.7 57. 15 104.6 8 31.75 196.9 22.6
3 88.9 304.8 66.55 127 8 35.1 228.6 34.8
4 114.3 355.6 76.2 157.2 8 41.1 273.1 53.9
5 141.3 419.1 91.9 185.7 8 47.88 323.9 90.8
6 168.3 482.6 108 215.9 8 53.8 368.3 141
8 219.1 552.5 127 269.7 12 53.8 438.2 214
10 273 673.1 165.1 323.9 12 66.55 539.8 411
12 323.8 762 184.2 381 12 73.15 619.3 592

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