Spectacle Blind Flanges

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Spectacle Blind Flanges is a specific type of flange used in piping systems to temporarily or permanently block the flow of fluid. It consists of two metal discs attached to each other by a central, hinge-like device. One of the discs is solid, while the other has an opening or a bore. The solid disc is typically called the "blind," and the disc with the opening is referred to as the "spectacle." Spectacle blind flanges are often used in industries such as oil and gas, petrochemical, chemical processing, and power generation, where the ability to isolate sections of the pipeline for maintenance or safety reasons is important. The use of spectacle blind flanges can minimize downtime and increase the efficiency of maintenance operations in piping systems.

spectacle-blind-flanges
Spectacle Blind Flanges

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Spectacle Blind Specification

Specification Spectacle Blind Flange
Spectacle Blind Flange Uses Spectacle Blinds are simple safety devices that are installed between two pipe flanges.
Size Chart 1/2 Inch to 36 Inch, (Customized Up to 48")
Thickness Sch 10S To SCH 180
Supporting Material Gasket/ Ring Joint/ Flange Bolts
Test Certificates EN 10204/3.1B
Raw Materials Certificate
100% Radiography Test Report
Third Party Inspection Report, etc
Production Technique Forged/ Heat treated and machined
Manufacturer of Forged/ Threaded/ Screwed / Plate
Manufacturer Pressure Class Class 150 (lb) up to 24"
Class 300 (lb) up to 20"
Class 600 (lb) up to 20"
Class 900 (lb) up to 16"
Class 1500 (lb) up to 10"
Class 2500 (lb) up to 8"
Flange Test Hydrostatic testing machine/ UI trasonic flaw detector/ X-ray detector/ Direct-reading Spectrograph/ Magnetic particle detector
Flange Equipment Pushing Machine/ electric bevelling machine/ Press machine/ Bending machine/ Sand-blasting machine etc
Coating Anti-rust Paint/ Zinc Plated/ Oil Black Paint/ Yellow Transparent/ Cold and Hot Dip Galvanized
Application Bitumen upgraders
Heavy oil refineries.
Nuclear power (mostly seamless).
Petrochemicals and acids.

ASME 16.48 Spectacle Blind Flange Dimensions

asme-16-48-spectacle-blind-flange-dimensions
Size in Inch Size in MM Inner Diameter Outer Diameter (O.D.) Center-Center Wall Thickness Width Of Web Web Thickness Hole Diameter Spectacle Blind Weight in (KG) Paddle Blank Weight in (KG) Paddle Spacer Blank Weight (Kg)
1/2 15 16 45 60 3 38 2 15.875 0.07 0.03 0.03
3/4 20 21 54 70 3 38 2 15.875 0.1 0.05 0.04
1 25 27 64 80 3 38 2 15.875 0.14 0.07 0.06
1 1/4 32 42 73 90 6.4 38 4 15.875 0.35 0.21 0.14
1 1/2 40 48 83 100 6.4 38 4 15.875 0.46 0.27 0.18
2 50 61 102 120 6.4 51 4 19.05 0.68 0.41 0.26
2 1/2 65 73 107 140 6.4 51 4 19.05 0.7 0.46 0.24
3 80 89 133 150 6.4 64 4 19.05 1.1 0.71 0.39
3 1/2 90 102 159 175 9.7 64 5 19.05 2.44 1.54 0.9
4 100 114 172 190 9.7 64 5 19.05 2.81 1.8 1.01
5 130 141 194 215 9.7 76 5 22.225 3.37 2.29 1.08
6 150 168 219 240 12.7 76 7 22.225 5.39 3.82 1.57
8 200 219 276 300 12.7 76 10 22.225 8.32 6.07 2.25
10 250 273 337 360 15.7 102 12 25.4 15.04 11.19 3.84
12 300 324 406 430 19.1 102 15 25.4 26.95 19.77 7.18
14 350 356 448 475 19.1 108 15 28.575 32.94 24.07 8.87
16 400 406 511 540 22.4 108 17 28.575 50.27 36.73 13.54
18 450 457 546 580 25.4 114 20 31.75 61.79 47.55 14.23
20 500 508 603 635 28.4 121 22 31.75 83.67 64.85 18.82
24 600 610 714 750 31.8 140 24 34.925 129.3 101.8 27.49

Spectacle Blind Weight

DN NPS Weight In KG
15 1/2
20 3/4 0.4
25 1 0.6
40 1 1/2 0.8
50 2 1.7
80 3 4.6
100 4 6.5
150 6 11.9
200 8 30
250 10 58
300 12 101

Types Of Blinds In Piping

stainless-steel-spectacle-blind-flanges
Stainless Steel Spectacle Blind Flanges
carbon-steel-spectacle-blind-flanges
Carbon Steel Spectacle Blind Flanges
pn16-spectacle-blind-flange
Pn16 Spectacle Blind Flanges
carbon-steel-paddle-blind-flanges
Carbon Steel Paddle Blind Flanges
spectacle-blind
Spectacle Blind
spectacle-flange
Spectacle Flange
spectacle-blinds
Spectacle Blinds
duplex-spec-blinds
Duplex Spec Blinds
super-duplex-spade-blind-flange
Super Duplex Spade Blind Flanges
nickel-alloy-figure-8-blind-flange
Nickel Alloy Figure 8 Blind Flanges
copper-spectacle-blind-open
Copper Spectacle Blind Open
inconel-paddle-blind-and-spacer
Inconel Paddle Blind And Spacer

Spectacle Blind Thickness

spectacle-blind-thickness

API 590 Spectacle Blind Dimensions

  • Face: FF
  • Size: 10 Inch (DN250)
  • Standards: API 590
  • Pressure: 600LB (PN100)
  • Materials: ASTM A105
api-590-spectacle-blind-dimensions
DN (D) (B) (Q) (L) (T1) (G) (T) (Kilogram)
15 38 17 10 60 4 12 8 0.24
20 48 23 15 60 4 12 8 0.31
25 58 29 15 60 4 12 8 0.4
40 78 43 15 60 4 14 8 0.62
50 88 55 15 60 6 14 8 0.78
80 124 83 30 60 6 18 8 1.35
100 144 108 30 70 6 18 8 1.67
200 254 210 40 70 8 18 12 6.64
300 363 312 40 80 8 22 15 15.77
400 463 393 50 80 10 22 18 31.07
500 568 495 50 80 10 22 22 54.91
600 667 597 50 80 10 27 25 82.84

30 Inch Spectacle Blind Dimensions

30-inch-spectacle-blind-dimensions
Normal Size               Weights    
  A  B  C  D  E  F  G    2 3,4
1 2 1/2 1.05 3 1/8  1/4 4 1 1/2 ……. 1 1 1
1 1/2 3 1/4 1.9 3 7/8  1/4 4 1 1/2 …….. 1 1 1
2 4 2.38 4 3/4  1/4 4 2 …….. 2 1 2
2 1/2 4 3/4 2.88 5 1/2  1/4 4 2 …….. 2 2 3
3 5 1/4 3.5 6  1/4 4 2 1/2 …….. 2 2 3
4 6 3/4 4.5 7 1/2  3/8 4 2 1/2 …….. 3 2 5
6 8 5/8 6.62 9 1/2  1/2 4 3 …….. 7 4 10
8 10 7/8 8.62 11 3/4  1/2 4 3 ……. 14 7 20
10 13 1/4 10.75 14 1/4  5/8 5 4 ……… 26 12 35
12 16 12.75 17  3/4 5 4 …….. 45 21 62
14 17 1/2 14 18 3/4  3/4 5 4 1/4 …….. 53 24 74
16 20 16 21 1/4  7/8 5 4 1/4 1 1/2 92 40 127
18 21 3/8 18 22 3/4 1 5 4 1/2 1 1/2 105 39 139
20 23 5/8 20 25 1 1/8 5 4 3/4 1 1/2 145 50 188
24 28 24 29 1/2 1 1/4 5 5 1/2 1 1/2 245 80 315
30 34 1/2 30 36 1 5/8 5 5 1/2 1 1/2 437 128 555
36 41 36 42 3/4 2 6 5 1/2 1 3/4 757 203 945

Spectacle Blind Gasket

spectacle-blind-gasket

Paddle Blind Flange Dimensions

paddle-blind-flange-dimensions
SIZE OD Thickness Weight
1/2 1-3/4 1/4 1
3/4 2-1/8 1/4 1
1 2-1/2 1/4 1
1-1/4 2-7/8 1/4 1
1-1/2 3-1/4 1/4 1
2 4 1/4 2
2-1/2 4-3/4 1/4 2
3 5-1/4 1/4 2
3-1/2 6-1/4 3/8 4
4 6-3/4 3/8 5
5 7-5/8 3/8 6
6 8-5/8 1/2 10
8 10-7/8 1/2 15
10 13-1/4 5/8 26
12 16 3/4 47
14 17-5/8 3/4 56
16 20-1/8 7/8 84

Slip Blind Flange Dimensions

slip-blind-flange-dimensions

Spectacle Blind Flange Drawing

spectacle-blind-flange-drawing

Class 150 Spectacle Blind Flange Dimensions

spectacle-blind-flange-dimensions
Normal Pipe Size
Class 150
FLANGES
A
B
C
D
E
F
1/2"
5/8
1-3/4
2-3/8
5/8
1-1/2
1/4
3/4"
13/16
2-1/8
2-3/4
5/8
1-1/2
1/4
1"
1-1/8
2-1/2
3-1/8
9/16
1-1/2
1/4
1-1/4"
1-5/8
2-7/8
3-1/2
9/16
1-1/2
1/4
1-1/2"
1-7/8
3-1/4
3-7/8
9/16
1-1/2
1/4
2"
2-3/8
4
4-3/4
11/16
2
1/4
2-1/2"
2-7/8
4-3/4
5-1/2
11/16
2
1/4
3"
3-1/2
5-1/4
6
11/16
2-1/2
1/4
3-1/2"
4
6-1/4
7
3/4
2-1/2
3/8
4"
4-1/2
6-3/4
7-1/2
3/4
2-1/2
3/8
5"
5-9/16
7-5/8
8-1/2
7/8
3
3/8
6"
6-5/8
8-5/8
9-1/2
7/8
3
1/2
8"
8-5/8
10-7/8
11-3/4
7/8
3
1/2
10"
10-3/4
13-1/4
14-1/4
1
4
5/8
12"
12-3/4
16
17
1
4
3/4
14"
14
17-5/8
18-3/4
1-1/8
4-1/4
3/4
16"
16
20-1/8
21-1/4
1-1/8
4-1/4
7/8
18"
18
21-1/2
22-3/4
1-1/4
4-1/2
1
20"
20
23-3/4
25
1-1/4
4-3/4
1-1/8
24"
24
28-1/8
29-1/2
1-3/8
5-1/2
1-1/4

Class 300 Spectacle Blind Flange Dimensions

spectacle-blind-flange-dimensions (1)
Normal Pipe Size
Class 300
FLANGES
A
B
C
D
E
F
1/2"
5/8
2
2-5/8
5/8
1-1/2
1/4
3/4"
13/16
2-1/2
3-1/4
3/4
1-1/2
1/4
1"
1-1/8
2-3/4
3-1/2
11/16
1-1/2
1/4
1-1/4"
1-5/8
3-1/8
3-7/8
11/16
1-1/2
1/4
1-1/2"
1-7/8
3-5/8
4-1/2
7/8
2
1/4
2"
2-3/8
4-1/4
5
3/4
2
3/8
2-1/2"
2-7/8
5
5-7/8
7/8
2-1/2
3/8
3"
3-1/2
5-3/4
6-5/8
7/8
2-1/2
3/8
3-1/2"
4
6-3/8
7-1/4
7/8
2-1/2
1/2
4"
4-1/2
7
7-7/8
7/8
2-1/2
1/2
5"
5-5/8
8-3/8
9-1/4
7/8
3
5/8
6"
6-5/8
9-3/4
10-5/8
7/8
3
5/8
8"
8-5/8
12
13
1
3-1/2
7/8
10"
10-3/4
14-1/8
15-1/4
1-1/8
4
1
12"
12-3/4
16-1/2
17-3/4
1-1/4
4
1-1/8
14"
14
19
20-1/4
1-1/4
4-3/4
1-1/4
16"
16
21-1/8
22-1/2
1-3/8
4-7/8
1-1/2
18"
18
23-3/8
24-3/4
1-3/8
4-1/2
1-5/8
20"
20
25-5/8
27
1-3/8
4-3/4
1-3/4
24"
24
30-3/8
32
1-5/8
5-1/2
2

Class 600 Spectacle Blind Flange Dimensions

spectacle-blind-flange-dimensions (2)
Normal Pipe Size
Class 600
FLANGES
A
B
C
D
E
F
1/2"
5/8
2
2-5/8
5/8
1-1/2
1/4
3/4"
13/16
2-1/2
3-1/4
3/4
1-1/2
1/4
1"
1-1/8
2-3/4
3-1/2
3/4
2-1/4
1/4
1-1/4"
1-7/16
3-1/8
3-7/8
3/4
2-1/4
3/8
1-1/2"
1-11/16
3-5/8
4-1/2
7/8
2-5/8
3/8
2"
2-1/8
4-1/4
5
3/4
2-1/4
3/8
2-1/2"
2-5/8
5
5-7/8
7/8
2-5/8
1/2
3"
3-1/4
5-3/4
6-5/8
7/8
2-5/8
1/2
3-1/2"
3-3/4
6-1/4
7-1/4
1
3
5/8
4"
4-1/4
7-1/2
8-1/2
1
3
5/8
5"
5-1/4
9-3/8
10-1/2
1-1/8
3-3/8
3/4
6"
6-3/8
10-3/8
11-1/2
1-1/8
3-3/8
7/8
8"
8-3/8
12-1/2
13-3/4
1-1/4
3-3/4
1-1/8
10"
10-7/16
15-5/8
17
1-3/8
4-1/8
1-3/8
12"
12-3/8
17-7/8
19-1/4
1-3/8
4-1/8
1-5/8
14"
13-5/8
19-1/4
20-3/4
1-1/2
4-1/2
1-3/4
16"
15-5/8
22-1/8
23-3/4
1-5/8
4-7/8
2
18"
17-5/8
24
25-3/4
1-3/4
5-1/4
2-1/8
20"
19-5/16
26-3/4
28-1/2
1-3/4
5-1/4
2-1/2
24"
23-1/2
31
33
2
6
2-7/8

Class 900 Spectacle Blind Flange Dimensions

spectacle-blind-flange-dimensions (3)
Normal Pipe Size
Class 900
FLANGES
A
B
C
D
E
F
1/2"
0.625
2.375
3.25
-
1.50
1/4
3/4"
0.0825
2.625
3.50
0.875
1.625
1/4
1"
1.05
3.0
4.0
1.0
2.25
1/4
1-1/4"
1.44
3.375
4.375
1.0
2.25
3/8
1-1/2"
1.68
3.5
4.875
1.125
2.625
3/8
2"
2.16
5.5
6.5
1.0
2.25
1/2
2-1/2"
2.64
6.375
7.5
1.125
2.625
1/2
3"
3.25
6.5
7.5
1.0
2.625
5/8
4"
4.25
8.0
9.25
1.25
3.0
3/4
5"
5.3
9.625
11.0
1.375
3.375
7/8
6"
6.36
11.25
12.5
1.25
3.375
1
8"
8.33
14.0
15.5
1.5
3.75
1-3/8
10"
10.42
17.0
18.5
1.5
4.125
1-5/8
12"
12.39
19.5
21.0
1.5
4.125
1-7/8
14"
13.62
20.375
22.0
1.625
4.5
2-1/8
16"
15.62
22.5
24.25
1.75
4.875
2-3/8
18"
17.62
25.0
27.0
2.0
5.25
2-5/8
20"
19.56
27.375
29.5
2.125
5.25
2-7/8
24"
23.5
32.875
35.5
2.625
6.0
3-1/2

Class 1500 Spectacle Blind Flange Dimensions

spectacle-blind-flange-dimensions (4)
Normal Pipe Size
Class 1500
FLANGES
A
B
C
D
E
F
1/2"
0.625
2.375
3.25
-
1.50
1/4
3/4"
0.82
2.625
3.50
0.875
1.625
3/8
1"
1.05
3.0
4.0
1.0
2.5
3/8
1-1/4"
1.375
3.375
4.375
1.0
2.5
3/8
1-1/2"
1.61
3.75
4.875
1.125
2.75
1/2
2"
2.07
5.5
6.5
1.0
2.75
1/2
2-1/2"
2.47
6.375
7.5
1.125
3.0
5/8
3"
3.07
6.75
8.0
1.25
3.0
3/4
4"
4.03
8.125
9.5
1.375
3.5
7/8
5"
5.05
9.875
11.5
1.625
3.5
1-1/8
6"
6.06
11.0
12.5
1.5
3.5
1-3/8
8"
7.98
13.75
15.5
1.75
4.0
1-5/8
10"
10.02
17.0
19.0
2.0
4.5
2
12"
11.94
20.375
22.5
2.125
4.5
2-3/8
14"
13.12
22.625
25.0
2.375
5.0
2-5/8
16"
15.0
25.125
27.75
2.625
5.25
3
18"
16.88
27.625
30.5
2.875
5.75
3-3/8
20"
18.81
29.625
32.75
3.125
6.0
3-3/4
24"
22.62
35.375
39.0
3.625
7.0
4-3/8

Class 2500 Spectacle Blind Flange Dimensions

spectacle-blind-flange-dimensions (4)
Normal Pipe Size
Class 2500
FLANGES
A
B
C
D
E
F
1/2"
0.625
2.625
3.5
-
1.50
3/8
3/4"
0.82
2.875
3.75
0.875
1.625
3/8
1"
1.05
3.25
4.25
1.0
2.5
3/8
1-1/4"
1.38
4.0
5.125
1.125
2.5
1/2
1-1/2"
1.61
4.5
5.75
1.25
2.75
5/8
2"
2.07
5.625
6.75
1.125
2.75
5/8
2-1/2"
2.47
6.5
7.75
1.25
3.0
3/4
3"
3.07
7.625
9.0
1.375
3.0
7/8
4"
4.03
9.125
10.75
1.625
3.5
1-1/8
5"
5.05
10.875
12.75
1.875
3.5
1-3/8
6"
6.06
12.375
14.5
2.125
3.5
2
8"
7.81
15.125
17.25
2.125
4.0
2-1/8
10"
9.75
18.625
21.25
2.625
4.5
2-5/8
12"
11.37
21.5
24.375
2.875
4.5
3-1/8
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