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A234 WPB Blind Flange

A234 WPB blind flange is a type of flange widely used in pipeline systems. A234 is the standard number of the American Society for Testing and Materials (ASTM), and WPB indicates that this material is a carbon steel pipeline component for medium and low temperatures.

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A234 WPB blind flange is a type of flange widely used in pipeline systems. A234 is the standard number of the American Society for Testing and Materials (ASTM), and WPB indicates that this material is a carbon steel pipeline component for medium and low temperatures.This material has good mechanical properties and corrosion resistance, and is suitable for various harsh working environments. At the same time, it can also be treated with different surface treatments according to customer needs, such as anti-rust paint, transparent oil galvanizing, etc.

When the pipeline fluid does not need to pass or a certain section of the pipeline needs to be temporarily closed, the A234 WPB blind flange can easily close the pipeline interface, effectively preventing fluid or gas from passing through the pipeline, and ensuring the safety of the working environment.

Specification of Blind Flanges

Sealing Face RF, FF, FTJ
Size Range 1/2” – 48” / DN15 – DN1200
Pressure Rating Class 150, 300, 600, 900, 1500, 2500lb
Standard ASME / ANSI B16.5, ASME B16.47 Series A/B
Carbon Steel ASTM A105 / A105N
Low Temp Carbon Steel ASTM A350 LF2/LF3
Pipeline Steel ASTM A694 F42 / 46 / 56 / 60 / 65
Alloy Steel ASTM A182 F11 / 12 / 5 / 9 / 91 / 92
Stainless Steel ASTM A182 F304/304L/304H, 316/316L, 310S, 317,347,904L
Duplex Stainless Steel ASTM A182 F51, F53, F44

Class 150 lb Blind Flange Dimensions 

NPS A C G H I J W
inch inch inch No. of holes inch inch kg/pc
mm mm mm mm mm
1/2 3.500 0.440 1.380 4 0.620 2.380 0.42
88.90 11.20 35.10 15.70 60.45
3/4 3.880 0.500 1.690 4 0.620 2.750 0.61
98.60 12.70 42.90 15.70 69.85
1 4.250 0.560 2.000 4 0.620 3.120 0.86
108.0 14.20 50.80 15.70 79.25
1-1/4 4.620 0.620 2.500 4 0.620 3.500 1.17
117.3 15.70 63.50 15.70 88.90
1-1/2 5.000 0.690 2.880 4 0.620 3.880 1.53
127.0 17.50 73.15 15.70 98.60
2 6.000 0.750 3.620 4 0.750 4.750 2.42
152.4 19.10 91.90 19.10 120.7
2-1/2 7.000 0.880 4.120 4 0.750 5.500 3.94
177.8 22.40 104.6 19.10 139.7
3 7.500 0.940 5.000 4 0.750 6.000 4.93
190.5 23.90 127.0 19.10 152.4
3-1/2 8.500 0.940 5.500 8 0.750 7.000 6.17
215.9 23.90 139.7 19.10 177.8
4 9.000 0.940 6.190 8 0.750 7.500 7.00
228.6 23.90 157.2 19.10 190.5
5 10.00 0.940 7.310 8 0.880 8.500 8.63
254.0 23.90 185.7 22.40 215.9
6 11.00 1.000 8.500 8 0.880 9.500 11.3
279.4 25.40 215.9 22.40 241.3
8 13.50 1.120 10.62 8 0.880 11.75 19.6
342.9 28.40 269.7 22.40 298.5
10 16.00 1.190 12.75 12 1.000 14.25 28.8
406.4 30.20 323.9 25.40 362.0
12 19.00 1.250 15.00 12 1.000 17.00 43.2
482.6 31.75 381.0 25.40 431.8
14 21.00 1.380 16.25 12 1.120 18.75 58.1
533.4 35.10 412.8 28.40 476.3
16 23.50 1.440 18.50 16 1.120 21.25 76.0
596.9 36.60 469.9 28.40 539.8
18 25.00 1.560 21.00 16 1.250 22.75 93.7
635.0 39.60 533.4 31.75 577.9
20 27.50 1.690 23.00 20 1.250 25.00 122
698.5 42.90 584.2 31.75 635.0
24 32.00 1.880 27.25 20 1.380 29.50 185
812.8 47.80 692.2 35.10 749.3

Application areas

Petrochemical industry
In the process of oil refining, it is used for the end plugging of various oil pipelines. For example, in the crude oil pipeline, when a section of the pipeline needs to be inspected or maintained, the blind flange can be used to plug the pipeline to prevent oil leakage. In chemical production, it is used for various chemical raw materials and product pipelines, such as acid, alkali and other corrosive media pipelines (under the condition of taking appropriate anti-corrosion measures). Due to its good mechanical properties and relatively low cost, it is widely used.
Natural gas transmission
In the natural gas transmission pipeline system, it is used for plugging at the branch of the pipeline or temporary plugging during the construction and maintenance of the pipeline system. For example, in the urban natural gas pipeline network, when a branch pipeline needs to be modified, the A234 WPB blind flange can be installed at the starting end of the branch pipeline to ensure safety during the construction process.
Building water supply and drainage system
In the water supply and drainage pipeline system inside the building, it is used for plugging some special locations. For example, in the basement of the building, when the water supply and drainage pipeline needs to be controlled by partition or during the commissioning stage of the pipeline system, the blind flange can be used as an effective plugging device.

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