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ASME B16.48 Spectacle Blind

The spectacle blind , also known as blind flange or plugging plate, is a special component used in pipeline systems. It is widely used in industrial fields, especially in chemical, petroleum, natural gas and other industries.

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The spectacle blind , also known as blind flange or plugging plate, is a special component used in pipeline systems. It is widely used in industrial fields, especially in chemical, petroleum, natural gas and other industries.The shape of the spectacle blind  is similar to the figure “8”. From the side, it consists of two symmetrical semicircular or nearly semicircular plates connected by a connecting part. This unique shape design makes it easy to install and remove in the piping system.

Specification of Spectacle Blind 

Sealing Face RF, FF, FTJ
Size Range 1/2” – 48” / DN15 – DN1200
Pressure Rating Class 150, 300, 600, 900, 1500, 2500lb
Standard-ANSI/ASME ASME B16.48 ,ASME B16.5,ANSI B16.47, MSS SP44, ANSI B16.36
DIN DIN2527, DIN2566, DIN2573, DIN2576, DIN2641, DIN2642, DIN2655, DIN2656, DIN2627, DIN2628, DIN2629, DIN 2631, DIN2632, DIN2633, DIN2634, DIN2635, DIN2636, DIN2637, DIN2638, DIN2673
BS BS4504, BS4504, BS1560, BS10

Dimension of ASME B16.48 Flange

The figure-8 blanks under the ASME B16.48 standard ranges from 1 / 2 “to 48” with a pressure range of Class 150,300,600,900,1500,2500 lb

Class 150 Spectacle Blind Flange

 

NPS Outside Ø Inside Ø Centerline Thickness Web Width
A B C t W
 1/2 45 16 60 3 38
 3/4 54 21 70 3 38
1 64 27 80 3 38
73 42 90 6.4 38
83 48 100 6.4 38
2 102 61 120 6.4 51
107 73 140 6.4 51
3 133 89 150 6.4 64
159 102 175 9.7 64
4 172 114 190 9.7 64
5 194 141 215 9.7 76
6 219 168 240 12.7 76
8 276 219 300 12.7 76
10 337 273 360 15.7 102
12 406 324 430 19.1 102
14 448 356 475 19.1 108
16 511 406 460 22.4 108
18 546 457 580 25.4 114
20 603 508 635 28.4 121
24 714 610 750 31.8 140

Functions and Uses

● Isolation and Conduction

When a certain section of the pipeline system needs to be completely isolated, the spectacle blind flange can be installed as a blind plate to partially block the pipeline. For example, when a certain device in the pipeline is being repaired, the figure-8 blank can be installed as a blind to prevent the medium in other pipelines from flowing into the pipeline section where the device is located, ensuring the safety of the maintenance.

Pressure Test

After the pipeline system is installed, a pressure test is required. The figure-8 blank can be used to close the end of the pipeline of the test section so that the medium (such as water or air, etc.) can be injected into the test section for pressure testing. By observing the pressure changes, the tightness and strength of the pipeline system can be detected.

Process Switching

In some complex industrial production processes, there are multiple material flow directions or operation modes. The figure-8 blank can easily realize the switching between different processes. For example, in an oil refinery, the production processes of different oil products may have some shared pipelines. By adjusting figure-8 blank, it is possible to switch between the production of different oil products.

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