Spectacle blind flange

spectacle blind flange

A flange which is basically a safety device installed between two pipe flanges is known as the Spectacle Blind Flange. During the operational hours, the open end is placed between the two flanges, so that the Spectacle Blind can act as a spacer for uninterrupted flow. In order to stop the flow inside the pipeline, the blind end of the Awwa C207 Spectacle Flanges is rotated to be placed between the flanges. Spectacle Blinds are generally permanent fixtures which help to isolate the downstream piping and equipment. The Ansi B16.48 Spectacle Flange is made of a steel plate which is cut into two disc shapes (one of flange spade and one of ring spacer) of a given thickness.

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ASME B16.48 spectacle blinds suppliers in UAE

Spectacle blind flange specification


Spectacle Blind Flange Specification

Manufacturing Standard Standard Size Range Pressure Class
  • ASME B16.48 spectacle blind flange
  • 1/2″ to 60″
  • DN 12mm to DN 1500mm

For any custom sizes contact listed spectacle blind flange suppliers & manufacturers, price available through Live chat

  • CL 150
  • CL 300
  • CL 400
  • CL 600
  • CL 900
  • CL 1500
  • CL 2500
Manufacturing Method Spade blind flange Schedule Spectacle blind sealing face finish
  • CNC machined spectacle blind flange from bar stock
  • Forged spectacle blind flange (Strongest choice)
  • Casting
  • Plate

Buy from leading spectacle blind flange suppliers who have zero rejection rates from USA, Egypt, South Africa, UK, Qatar & UAE

  • SCH 10 / 10S to 160
  • Ra 3.2µm-6.3µm
  • Spiral Finish
Check Paddle Blank and Spacer Inspection Packaging and Marking Testing of Fig 8 Blinds
  • Outer & Inner Diameter of spectacle blanks body
  • Diameter of stainless steel 317L spectacle blind flange bolt circle & bolt hole
  • Hub Diameter Of
  • Thickness of weld end
  • Straightness and alignment of line blinds bolt hole
  • Material specification
  • Sizes
  • Production code of spectacle blind flange manufacturers
  • Manufacturer’s name, brand logo
  • Pressure Rating Designation
  • Face type of AISI 4140 spectacle blind flange
  • Bore (if applicable)
  • Dimensional standard (ASME B16.48)
  • Heat code
  • PMI
  • Hardness test
  • MTC EN 10204 type 3.1
  • Impact test
  • NACE MR0175
  • ISO 15156
  • Tensile test
  • Visual inspection for flat face spectacle blind surfaces, welding & holes
  • Shell pressure test
Sealing Face Surface Of Paddle Blind Flange Buying Tips
  • Flat face spectacle blind – (FF)
  • Raised face spectacle blind – (RF)
  • Ring joint face spectacle blind – (RTJ)
  • Ring joint surface
  • Grooved surface
  • Flat surface
  • Convex surface
  • Size
  • Length
  • O.D.
  • Pressure Rating
  • MTR Report
  • Thickness
  • Weight

 

Many of the listed suppliers can supply figure 8 blind flange at dealer prices in Dubai.

Material of spectacle blind flange

Forged Plate
Carbon Steel Spectacle Blind Flange
ASTM A105 spectacle blind flange ASTM A515 Grade 60
ASTM A105N
ASTM A350 Grade LF2
ASTM A350 Gr LF3
ASTM A350 Gr LF6
Low Temperature Carbon Steel
ASTM A694 F42 ASTM A572 Gr 42
ASTM A694 F46
ASTM A694 F50 ASTM A572 Gr 50
ASTM A694 F52
ASTM A694 F60 ASTM A572 Grade 60
ASTM A694 F65 ASTM A572 Grade 65
ASTM A694 F70 ASTM A572 Grade 70
S235JRG2, P250GH, 1.4541, 1.4571
Alloy Steel Spectacle Blind Flange
ASTM A182 Grade F5A & F5 ASTM A387 Grade 5
ASTM A182 F1
ASTM A182 F9 ASTM A387 Grade 9
ASME/ ASTM A182 F11 ASTM A387 Grade 11
ASTM A182 F22 ASTM A387 Gr 22
ASTM A182 F91 ASTM A387 Gr 91
Stainless Steel Spectacle Blind Flange
ASTM A182 F304 spectacle blind flange ASTM A240 304
ASTM A182 304L ASTM A240 304L
ASTM A182 310 ASTM A240 310
ASTM A182 F316 spectacle blind flange ASTM A240 316
ASTM A182 316L ASTM A240 316L
ASTM A182 316LN ASTM A240 316LN
ASTM A182 317 ASTM A240 317
ASTM A182 317 ASTM A240 317L
ASTM A182 F347 ASTM A240 347
ASTM A182 F321 ASTM A240 321
ASTM A182 F904L ASTM A240 904L
ASTM A182 F6A
ASTM B462 UNS N08020 ASTM B 463 N08020
Duplex / Super Duplex Spectacle Blind Flange
ASTM A182 F51 ASTM A240 UNS S31803
ASTM A182 F53 ASTM A240 UNS S32750
ASTM A182 F55 ASTM A240 UNS S32760
Al 6XN ASTM A240 UNS N08367
ASTM A182 F44 ASTM A240 UNS S31254
ASTM A182 F60 ASTM A240 UNS S32205
Titanium Spectacle Blind Flange
ASTM B381 Grade F2 ASTM B265 UNS R50400
ASTM B381 Grade F3 ASTM B265 UNS R50550
Copper Spectacle Blind Flange
ASTM B283 UNS C37700 ASTM B152 UNS C10100
ASTM B124 UNS C63000
Copper Nickel Spectacle Blind Flange
Copper nickel 90/10 : ASTM B151 UNS C70600 ASTM B122 CU-Ni 90/10
Copper nickel 70/30 : ASTM B151 UNS C71500 ASTM B122 CU-Ni 70/30
EEMUA 234 : UNS 7060X
EEMUA 145
EN 1652/ 12420/124491
Ductile Iron Spectacle Blind Flange
ASTM B381 GR.F2
Nickel Alloy Spectacle Blind Flange
Inconel 800 – ASTM B564 ASTM B409 UNS N08800
Inconel 825 – ASTM B564 ASTM B409 UNS N08825
Inconel 600 – ASTM B564 ASTM B168 UNS N06600
Inconel 601 – ASTM B564 ASTM B168 UNS N06601
Inconel 625 spectacle blind flange – ASTM B564 ASTM B168 UNS N06625
Monel 400 Spectacle Blind flange – ASTM B564 ASTM B127 UNS N04400
Monel K500 – ASTM B564 ASTM B127 UNS N05500
Hastelloy C-22 – ASTM B366 ASTM B575 UNS N06022
Hastelloy C 276 spectacle blind flange – ASTM B366 ASTM B575 UNS N10276

 

Spectacle Blind Flange Material

Top 4 Types of spectacle flange

Stainless Steel spectacle blind flange

Stainless Steel spectacle blind flange

ASTM A105 spectacle blind

ASTM A105 spectacle blind

Carbon steel spec blind flange

Carbon steel spec blind flange

ASTM A182 F316 spade blind flange

ASTM A182 F316 spade blind flange

Alloy steel spectacle blank

Alloy steel spectacle blank

Super duplex figure 8 blind flange

Super duplex figure 8 blind flange

ASTM A182 F304 Skillet blind flange

ASTM A182 F304 Skillet blind flange

Duplex steel figure 8 spectacle blind

Duplex steel figure 8 spectacle blind

ASME B16.48 spectacle blind

ASME B16.48 spectacle blind

  • Plate spectacle blind flange (made from plate)
  • Cast spectacle blind flange
  • Forged spectacle blind flange
  • CNC machined spectacle blind flange

 

Alloy steel spectacle blind flange temperature range

Alloy Grade UNS Forged spectacle blind flange Casting spectacle blind flange DIN WNR Temperature range
Moly steel spectacle blind flange C-1/2Mo K12822 ASTM A182 Gr F1 cl2 ASTM A217-WC1 15M03 1.5415
  • Up to 470ºC*
  • 875ºF
Alloy steel chrome moly spectacle blind flange 1.1/4Cr-1/2Mo K11572 ASTM A182 Gr F11 cl2 ASTM A217 WC6 13CRM044 1.7335
  • Up to 593ºC
  • 1100ºF
2.1/4Cr-1Mo K21590 ASTM A182 Grade F22 cl3 ASTM A217 Gr WC9 10CRM0910 1.7380
  • Up to 593ºC
  • 1100ºF
5Cr-1/2Mo K41545 ASTM A182 Grade F5/F5a ASTM A217 Gr C5 12CRMO195 1.7362
  • High temp boiler/ refinery application
9Cr-1Mo K90941 A182 Gr F9 A217-C12 X 12 CrMo 9 1 1.7386
  • High temp erosive refinery application
9Cr-1Mo-V A182 Gr F91 A217-C12A X 10 CrMoVNb 9 1 1.4903
  • High pressure boilers
Alloy steel spectacle blind flange AISI 4130 spectacle blind flanges G41300 ASTM A182 ASTM A217/M 1.7218
  • 899 to 927°C
  • 1650 to 1700°F

 

Copper nickel spectacle blind flange specification

Cu-Ni Spectacle Blinds flange Sizes Copper Nickel Spectacle Flange Outside & Drilling Diameter Cupro Nickel Figure 8 Blind Flange Large Size
  • ½ – 36 inch
  • 16 – 914mm
  • ½ – 24 inch
  • 16 – 610 mm
  • 24 – 36 inch
  • 711 -914 mm

Accoding to MSS SP-44

Copper Nickel Figure 8 Spectacle Blind Pressure Class Composite UNS C70600 Raised Face Spectacle Blind Are Manufactured From Recommended Hardware Of CUNI RTJ Spectacle Blind
  • 16 bar
  • 20 bar
  • ASTM A105N
  • Welded UNS C70620 copper nickel disk
  • As per ASME B16.48
Types Coating Of C71500 Slip Blind Plate Most Common Types Of Copper Nickel Spade Blind Applications Of C70600 Spade Blind Flange
  • Hot dipped galvanising
  • Composite spectacle blind flanges
  • Solid spectacle blind flanges
  • Offshore
  • Marine applications
  • Seawater
  • Petrochemical
  • Petroleum plants
Grade UNS Number Standard
  • CU-Ni 90/10
  • CU-Ni 70/30
  • UNS C70620
  • UNS 7060X
  • CW352H
  • EN 1652
  • EN 12420
  • EEMUA 234/3-6
  • EEMUA 145
  • EEMUA 234
  • EN 124491
  • DIN 86019
  • ASTM B4662
  • ASTM B467
  • WL 2.1972
  • MIL-T-16420K

 

ASME B16.48 spectacle blind flange face types

ASME B16.48 spectacle blind flange face types

 

Type Sealing way of spectacle blind in piping
FF Flat face spectacle blind
Raised face spectacle blind RF
RTJ Ring joint face spectacle blind

 

Check dimensions

 

Raised face spectacle blind height

Class Of Raised Face Spectacle Blind Height
150 LB 1/6″
300 LB 1/6″
400 LB 1/4″
600 LB 1/4″
900 LB 1/4″
1500 LB 1/4″
2500 LB 1/4″

 

Paddle blind flange size chart

Hole Diameter
Sizein Inch Sizein MM Class 150 Class 300 Class 600 Class 900 Class 1500 Class 2500
1/2 15 15.875 15.875 15.875 22.225 22.225 22.225
3/4 20 15.875 19.05 19.05 22.225 22.225 22.225
1 25 15.875 19.05 19.05 25.4 25.4 25.4
1 1/4 32 15.875 19.05 19.05 25.4 25.4 28.575
1 1/2 40 15.875 22.225 22.225 28.575 28.575 31.75
2 50 19.05 19.05 19.05 25.4 25.4 28.575
2 1/2 65 19.05 22.225 22.225 28.575 28.575 31.75
3 80 19.05 22.225 22.225 25.4 31.75 34.925
3 1/2 90 19.05 22.225 25.4  –  –
4 100 19.05 22.225 25.4 31.75 34.925 41.275
5 125 22.225 22.225 28.575 34.925 41.275 47.625
6 150 22.225 22.225 28.575 31.75 38.1 53.975
8 200 22.225 25.4 31.75 38.1 44.45 53.975
10 250 25.4 28.575 34.925 38.1 50.8 66.675
12 300 25.4 31.75 34.925 38.1 53.975 73.025
14 350 28.575 31.75 38.1 41.275 60.325  –
16 400 28.575 34.925 41.275 44.45 66.675  –
18 450 31.75 34.925 44.45 50.8 73.025  –
20 500 31.75 34.925 44.45 53.975 79.375  –
24 600 34.925 41.275 50.8 66.675 92.075  –

 

Isometric symbol of spectacle blinds

Isometric Symbol Image Flange
Isometric symbol of spectacle blinds spectacle blind flange image Spectacle blind flange

 

Spade blind thickness

NPS in Inch
Outside Diameter Thickness
1/2 1 3/4 5/16
3/4 2 1/8 5/16
1 2 1/2 5/16
1 1/4 2 7/8 5/16
1 1/2 3 1/4 5/16
2 4 5/16
2 1/2 4 3/4 5/16
3 5 1/4 5/16
3 1/2 6 1/4 3/8
4 6 3/4 3/8
5 7 5/8 3/8
6 8 5/8 1/2
8 10 7/8 1/2
10 13 1/4 5/8
12 16 3/4
14 17 5/8 3/4
16 20 1/8 7/8
18 21 1/2 1
20 23 3/4 1 1/8
22 25 7/8 1 1/4
24 28 1/8 1 1/4

 

Stainless steel spectacle blind flange supporting material

  • Flanges
  • Gaskets
  • Stud bolts

 

Germany DIN standard of figure 8 blind flange

  • DIN 86042 (PN 10 and PN 16)

 

RTJ spectacle blind pressure class

ASME B16.48 spectacle blind flange
  • 150 LBs
  • 250 LBs
  • 300 LBs
  • 350 LBs
  • 400 LBs
  • 600 LBs
  • 900 LBs
  • 1500 LBs
  • 2500 LBs
EN 1092-1 spectacle blind flange
  • PN6
  • PN10
  • PN16
  • PN25
  • PN40
  • PN63
  • PN100

 

Gaskets for carbon steel spectacle blind flange

  • Flat face gaskets
  • Semi-metallic gaskets
  • Ring joint gaskets

 

Spectacle blind flange dimensions

Class 150

Spectacle blind flange dimensions

 

Normal Pipe Size Outside Diameter Of A Thickness Of T Web Width Of W Inner Diameter Of B Center Line Of C
1/2 45 3 38 16 60
3/4 54 3 38 21 70
1 64 3 38 27 80
1.1/4 73 6.4 38 42 90
1.1/2 83 6.4 38 48 100
2 102 6.4 51 61 120
2.1/2 107 6.4 51 73 140
3 133 6.4 64 89 150
3.1/2 159 9.7 64 102 175
4 172 9.7 64 114 190
5 194 9.7 76 141 215
6 219 12.7 76 168 240
8 276 12.7 76 219 300
10 337 15.7 102 273 360
12 406 19.1 102 324 430
14 448 19.1 108 356 475
16 511 22.4 108 406 460
18 546 25.4 114 457 580
20 603 28.4 121 508 635
24 714 31.8 140 610 750

 

Class 300 Spectacle blind

class 300 spectacle blind

Normal Pipe Size Outside Diameter Of A Thickness Of T Web Width Of W Inner Diameter Of B Center Line Of C
1/2 51 6.4 38 16 65
3/4 64 6.4 38 21 80
1 70 6.4 38 27 90
1.1/4 79 6.4 38 42 100
1.1/2 92 6.4 38 48 115
2 108 9.7 51 61 125
2.1/2 127 9.7 51 73 150
3 146 9.7 64 89 170
3.1/2 162 12.7 64 102 185
4 178 12.7 64 114 200
5 213 15.7 76 141 235
6 248 15.7 76 168 270
8 305 22.4 76 219 330
10 359 25.4 102 273 385
12 419 28.4 102 324 450
14 483 31.8 108 356 515
16 536 38.1 108 406 570
18 594 41.1 114 457 630
20 651 44.5 121 508 685
24 772 50.8 140 610 810

 

Class 600 Spectacle blind

class 600 spectacle blind

Normal Pipe Size Outside Diameter Of A Thickness Of T Web Width Of W Inner Diameter Of B Center Line Of C
1/2 51 6.4 38 16 65
3/4 64 6.4 38 21 80
1 70 6.4 57 27 90
1.1/4 79 9.7 57 37 100
1.1/2 92 9.7 67 43 115
2 108 9.7 57 55 125
2.1/2 127 12.7 67 67 150
3 146 12.7 67 83 170
3.1/2 159 15.7 76 96 185
4 191 15.7 76 108 215
5 238 19.1 86 135 265
6 264 22.4 86 162 290
8 318 28.4 95 212 350
10 397 35.1 105 265 430
12 454 41.1 105 315 490
14 489 44.5 114 346 525
16 562 50.8 124 397 605
18 610 53.8 133 448 655
20 679 63.5 133 497 725
24 787 73.2 152 597 840

 

Class 900 Spectacle blind

Class 900 Spectacle blind

Normal Pipe Size Outside Diameter Of A Thickness Of T Web Width Of W Inner Diameter Of B Center Line Of C
1/2 60 6.4 38 16 80
3/4 67 6.4 41 21 90
1 76 6.4 57 27 100
1.1/4 86 9.7 57 37 110
1.1/2 95 9.7 67 43 125
2 140 12.7 57 55 165
2.1/2 162 12.7 67 67 190
3 165 15.7 67 83 190
4 203 19.1 76 108 235
5 244 22.4 86 135 280
6 286 25.4 86 162 320
8 356 35.1 95 212 395
10 432 41.1 105 265 470
12 495 47.8 105 315 535
14 518 53.8 114 346 560
16 572 60.5 124 397 615
18 635 66.5 133 448 685
20 696 73.2 133 497 750
24 835 88.9 152 597 900

 

Class 1500 Spectacle blind

Class 1500 Spectacle blind

Normal Pipe Size Outside Diameter Of A Thickness Of T Web Width Of W Inner Diameter Of B Center Line Of C
1/2 61 6.4 38 16 80
3/4 67 9.7 41 21 90
1 76 9.7 64 27 100
1.1/4 86 9.7 64 35 110
1.1/2 95 12.7 70 41 125
2 140 12.7 70 53 165
2.1/2 162 15.7 76 63 190
3 172 19.1 76 78 205
4 206 22.4 89 102 240
5 251 28.4 89 128 290
6 279 35.1 89 154 320
8 349 41.1 102 203 395
10 432 50.8 114 255 480
12 518 60.5 114 303 570
14 575 66.5 127 333 635
16 638 76.2 133 381 705
18 702 85.9 146 429 775
20 752 95.3 152 478 830
24 899 111.3 178 575 990

 

Class 2500 Spectacle blind

Class 2500 Spectacle blind

Normal Pipe Size Outside Diameter Of A Thickness Of T Web Width Of W Inner Diameter Of B Center Line Of C
1/2 67 9.7 38 16 90
3/4 73 9.7 41 21 95
1 83 9.7 64 27 110
1.1/4 102 12.7 64 35 130
1.1/2 114 15.7 70 41 145
2 143 15.7 70 53 170
2.1/2 165 19.1 76 63 195
3 194 22.4 76 78 230
4 232 28.4 89 102 275
5 276 35.1 89 128 325
6 314 41.1 89 154 370
8 384 53.8 102 198 440
10 473 66.5 114 248 540
12 546 79.2 114 289 620

 

Spectacle blind flange weight chart

Normal Pipe Size in Inch CL 150 CL 300 CL 600 CL 900 CL 1500 CL 2500
1/2 0.12 0.25 0.38 0.46 0.46 0.72
3/4 0.17 0.38 0.57 0.61 0.79 0.89
1 0.23 0.46 0.73 0.80 1.05 1.19
1-1/4 0.49 0.56 1.24 1.37 1.40 2.14
1-1/2 0.63 0.76 1.65 1.73 2.08 3.17
2 0.96 1.46 2.33 3.98 4.04 4.90
2-1/2 1.07 1.98 3.61 5.21 6.21 7.50
3 1.59 2.61 4.87 6.68 8.47 11.81
3-1/2 3.00 3.93 6.46
4 3.52 4.73 9.00 11.45 13.58 20.45
5 4.34 7.93 15.34 18.15 23.62 34.01
6 6.66 10.56 21.06 27.04 34.45 49.98
8 10.19 21.16 35.75 53.48 60.13 94.12
10 17.59 31.63 64.41 88.31 108.77 171.27
12 30.31 47.11 94.88 130.89 182.62 268.26
14 36.80 71.30 116.37 156.56 245.28
16 55.11 102.25 171.78 208.72 339.62
18 68.18 133.67 210.36 278.80 457.52
20 90.98 170.85 299.91 361.74 569.25
24 139.19 269.41 447.64 619.04 936.93

 

There is no need to spend more stainless steel spectacle blind flange manufacturers and take advantage of the best pricing in the GCC countries

A Carbon Steel Spectacle Blind Flange can be used for sandwiching between RTJ flanges. The gasket is an eminent part of the entire design and thus, there is no requirement for the Spectacle Blind Installation.

The surface finishes available for ASME B 16.48 Spectacle Blind are smooth, concentric serrated, and stock.

Yes, clients can get Ss Spectacle Blind Flange in two parts- the line blank and the ring spacer.

Check alloy steel spectacle flanges price in Bahrain and ASME 16.48 spacer blank flanges manufactured by cut, cast, and forged techniques.

According to the standard, the Alloy Steel Spacer Blank Flange gets hard stamped with size, quality, material, class, heat number and the manufacturer symbol. As and when required, stock/code number can be added coupled with color coding.

Find trusted ASTM A182 F304 spectacle blinds flange and duplex steel spacer blank stockist in the middle east and Asia

Of course, the Spectacle Blind Manufacturers can customize the blinds to have a true “Raised face” (1/16 – 1/8″ lip) on both sides.