Blind flange

Blind flange

A closure plate flange is basically installed at the end of a piping network to terminate its run. A Blind Flange comes without a hub or bored center, which means they look like a metallic disc. The Nickel Alloy Blind Flanges ensures that there is no flow through the pipe so that it can isolate a pipe, valve, or pressure vessel. Even Though the Ansi B16.5 Blind Flange has a simple design, it is quite expensive. They can also be used for sealing the nozzle opening on a pressure vessel.

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Blind flange specification


Blind Flange Specification

Manufacturing Standard Standard Size Range Pressure Class
  • ASME B16.5 blind flange : NPS ½” – 24”
  • ASMEB16.47 blind flange (Large size) : NPS 26” – 60”
  • ½ – 48 inch
  • 15 – 1200 NB

Contact above listed blind flange supplier for above 48″

  • 150
  • 300
  • 400
  • 600
  • 900
  • 1500
  • 2500
  • PN6
  • PN10
  • PN16
  • PN25
  • PN40
  • PN64
Blind Flange Manufacturing Method Thickness Of Spider Blind Flange BF & BLRF Meaning
  • Forged blind flange (Strongest choice)
  • Plate
  • CNC machined blind flange from bar stock
  • Casting

Above listed companies can export blind flange to UAE, South Africa, USA, UK, Egypt & Qatar with

  • Schedule 10 / 10S – SCH 160
  • BF : Blind Flange
  • BLRF : Blind flange raised face
Check BLRF Flange Before Delivery Threaded Blind Flange Marking & Packaging Quality Test & MTC Of Ported Blind Flange
  • Outer & Inner Diameter of dummy flange body
  • Diameter of forged blind flange bolt circle & bolt hole
  • Hub Diameter Of stainless steel 904l blind flange
  • Thickness of weld end
  • Alignment / straightness of RF blind flange bolt hole
  • Manufacturer’s name, brand logo
  • Pressure Rating Designation
  • Material specification
  • Sizes
  • blank flange face type
  • Bore (if applicable)
  • Dimensional standard (ASME B16.5/ 16.47/ B16.36 etc)
  • Heat code
  • Production code of blind flange manufacturers
  • MTC EN 10204 type 3.1
  • NACE MR0175
  • ISO 15156
  • PMI
  • Hardness test
  • Tensile test
  • Impact test
  • Visual inspection for stainless steel 317L blind flange surfaces, welding & holes
  • Shell pressure test

 

Get tested alloy steel blank flanges and duplex steel blind flat flanges at the best price in middle east countries

Plate & forged blind flange material

Manufacturing standard
Forged method Plate method
Stainless Steel Blind Flange/ BLRF
ASTM A182 F304 blind flange / SS 304 ASTM A240 304
ASTM A182 304L/ SS 304L ASTM A240 304L
ASTM A182 310 ASTM A240 310
ASTM A182 F316 blind flange/ SS 316 ASTM A240 316
ASTM A182 316L/ SS 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 B463 N08020
Carbon Steel Blind Flange
Forged method Plate method
ASTM A105 blind flange ASTM A515 Grade 60
ASTM A105N
ASTM A350 Grade LF2
ASTM A350 Gr LF3
ASTM A350 Gr LF6
Low Temperature Carbon Steel (LTCS)
ASTM A694 F42 blind flange 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 Blind Flange
Forged method Plate method
ASTM A182 Grade F5A & F5 ASTM A387 Grade 5
ASTM A182 F1
ASTM A182 F9 ASTM A387 Grade 9
ASME/ ASTM A182 F11 blind flange ASTM A387 Grade 11
ASTM A182 F22 ASTM A387 Gr 22
ASTM A182 F91 ASTM A387 Gr 91
Duplex Steel Blind Flange
Forged method Plate method
ASTM A182 F51 (Duplex 2205) ASTM A240 UNS S31803
ASTM A182 F53 blind flange ASTM A240 UNS S32750
ASTM A182 F55 (Duplex 2507) ASTM A240 UNS S32760
Al 6XN ASTM A240 UNS N08367
ASTM A182 F44 ASTM A240 UNS S31254
ASTM A182 F60 ASTM A240 UNS S32205
Nickel Alloy Blind Flange
Forged method Plate method
SB 564 Inconel 800 ASTM B409 UNS N08800
SB 564 Inconel 825 ASTM B409 UNS N08825
SB 564 Inconel 600 ASTM B168 UNS N06600
SB 564 Inconel 601 ASTM B168 UNS N06601
Inconel 625 blind flange – ASTM B564/ SB 564 ASTM B168 UNS N06625
Monel 400 blind flange – ASTM B564/ SB 564 ASTM B127 UNS N04400
Monel K500 – ASTM B564/ SB 564 ASTM B127 UNS N05500
Hastelloy C-22 – ASTM B564/ SB 564 ASTM B575 UNS N06022
Hastelloy C 276 blind flange – ASTM B564/ SB 564 ASTM B575 UNS N10276
Titanium Blind Flange
Forged method Plate method
ASTM B381 Grade F2 ASTM B265 UNS R50400
ASTM B381 Grade F3 ASTM B265 UNS R50550
Copper Blind Flange
Forged method Plate method
ASTM B283 UNS C37700 ASTM B152 UNS C10100
ASTM B124 UNS C63000
Copper Nickel Blind Flange
Forged method Plate method
Cuni 90/10 : ASTM B151 UNS C70600 ASTM B122 CU-Ni 90/10
Cuni 70/30 : ASTM B151 UNS C71500 ASTM B122 CU-Ni 70/30
EEMUA 234 : UNS 7060X
EEMUA 145
EN 1652/ 12420/124491
Ductile Iron Blind Flange
Forged method Plate method
ASTM B381 GR.F2/ 1018 Cast Iron

Blind Flange Material

Types of blind flanges

  • Forged blind flange
  • CNC machined BLRF flange
  • Blind plate flange (manufactured from plate)

 

Stainless steel blind flange

Stainless steel blind flange

Carbon steel blind flange

Carbon steel blind flange

Alloy steel blank flanges

Alloy steel blank flanges

ASME b16.5 blind flange

ASME b16.5 blind flange

Duplex steel blind flat flanges

Duplex steel blind flat flanges

ASTM A182 F304 blind flange

ASTM A182 F304 blind flange

Raised face blind flange

Raised face blind flange

SS threaded blind flange

SS threaded blind flange

ASTM A182 F316 blrf flange

ASTM A182 F316 blrf flange

Nickel alloy pipe blind flange

Nickel alloy pipe blind flange

Copper blind flange

Copper blind flange

ASME b16.5 raised face blind flange

ASME b16.5 raised face blind flange

Alloy steel blind flange temperature range

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

 

Copper nickel blind flange specification

Copper Nickel Blind Flange Sizes Cu-Ni Dummy flange OD & Drilling Dia Large Size Cupro Nickel Blind Flange
  • ½ – 36 inch
  • 16 – 914mm
  • ½ – 24 inch
  • 16 – 610 mm
  • 24 – 36 inch
  • 711 -914 mm

Accoding to MSS SP-44

ASTM B171 UNS C70600 Blind Flanges Pressure Class Composite Copper Nickel Blind Flanges Are Manufactured From CUNI Blind Flanges Recommended Hardware
  • 16 bar
  • 20 bar
  • ASTM A105N
  • Welded UNS C70620 copper nickel disk
  • As per ASME B16.5
C70600 Blind Flange Coating Copper Nickel Blank Flange Types C71500 Blind Flanges Applications
  • Hot dipped galvanising
  • Composite blind flanges
  • Solid blind flanges
  • Marine applications
  • Offshore
  • Seawater
  • Petrochemical/ petroleum plants
Grade UNS Of tapped blind flange Standard
  • CuNi 90/10 spider blind flange
  • CuNi 70/30
  • EEMUA 234/3-6
  • EEMUA 145
  • EEMUA 234
  • UNS 7060X
  • UNS C70620 ported blind flange
  • CW352H
  • EN 1652/ 12420/124491
  • DIN 86019
  • WL 2.1972 blind flange with threaded hole
  • MIL-T-16420K
  • ASTM B4662
  • ASTM B467 reducing blind flange

 

Stainless steel blind flange international standards

USA Europe Germany Japan
  • MSS SP44
  • ASME B16.5 blind flange
  • API 605
  • AWWA
  • AWWA C207
  • ANSI B16.5
  • CL 125 (Light weight)
  • ANSI B16.47 (API 605)
  • ANSI B16.36
  • ANSI B16.48
  • ASA
  • PN 10 to PN400
  • BS EN 1759
  • ISO 7005
  • DIN
  • JIS
  • JIS B2220
Australia & UK Europe Russia Italy
  • BS 10
  • BS EN 1092-1 blind flange
  • BS EN 1092-2 RF blind flange
  • BS EN 1092-3 blind pipe flange
  • Ghost
  • UNI 2276
  • UNI 6091
South Korean and China Malaysia France Canada
  • KS B1503 (South Korean)
  • GB/T 9112 / 9119 (China)
  • MS 253
  • MS 816
  • MS 253
  • MS 816
  • NF E 29-200
  • NF E 29-203
  • CSA B16.5
  • ANSI B16.47 Series A & B

 

ASME B16.5 blind flange face types

ASME B16.5 blind flange face types

 

Type Sealing way of blind pipe flange
BLRF Raised face
FF Flat face
RtJ Ring type Joint
T&G Tongue and Groove
M&F Male & female

 

Check dimensions

 

Raised face blind flange height

Class Of RF Blind Flange Height
Class 150 1/6″
Class 300 1/6″
Class 400 1/4″
Class 600 1/4″
Class 900 1/4″
Class 1500 1/4″
Class 2500 1/4″

 

ANSI B16.5 blind flange size chart

Number of Bolts
Size in Inch Size in MM Class 150 Class 300 Class 400 Class 600 Class 900 Class 1500 Class 2500
1/2 15 4 4 4 4 4 4 4
3/4 20 4 4 4 4 4 4 4
1 25 4 4 4 4 4 4 4
1 1/4 32 4 4 4 4 4 4 4
1 1/2 40 4 4 4 4 4 4 4
2 50 4 8 8 8 8 8 8
2 1/2 65 4 8 8 8 8 8 8
3 80 4 8 8 8 8 8 8
3 1/2 90 8 8 8 8  –  – 8
4 100 8 8 8 8 8 8 8
5 125 8 8 8 8 8 8 8
6 150 8 12 12 12 12 12 8
8 200 8 12 12 12 12 12 12
10 250 12 16 16 16 16 12 12
12 300 12 16 16 20 20 16 12
14 350 12 20 20 20 20 16  –
16 400 16 20 20 20 20 16  –
18 450 16 24 24 20 20 16  –
20 500 20 24 24 24 20 16  –
24 600 20 24 24 24 20 16  –

 

Blind flange isometric symbol

Isometric Symbol Image Flange
Blind flange isometric symbol Blind flange image Blind Flange

 

Germany DIN standard of blind flange

 

British BS standard of blind flange

 

JIS standard of blind flange

  • JIS B2220
  • JIS B2311
  • JIS B2312
  • JIS B2313
  • KS B1522
  • KS B1541
  • KS B1543
  • KS1503

 

UNI standard of blind pipe flange

  • UNI 6091 67
  • UNI 6092 67
  • UNI 6093 67
  • UNI 6094 67
  • UNI 6095 67
  • UNI 6096 67
  • UNI 6097 67

 

Flat face blind flange pressure class

ASME B16.5 blind flange
  • 150#
  • 250#
  • 300#
  • 350#
  • 400#
  • 600#
  • 900#
  • 1500#
  • 2500#
KS1503/ JIS B2220 blind flange
  • 5K
  • 10K
  • 16K
  • 20K
  • 30K
EN1092-1 blind flange
  • PN6
  • PN10
  • PN16
  • PN25
  • PN40
  • PN63
  • PN100
SANS/SABS 1123 blind flange
  • Class 600/3
  • 1000/3
  • 1600/3
  • 2500/3
  • 4000/3

 

Blind flange dimensions

Blind flange dimensions

 

NPS 1/2 blind flange
Class 150# 300# 600# 900# 1500# 2500#
D 90 95 95 120 120 135
B 11.2 14.3 20.7 28.7 28.7 36.6
G 35.1 35.1 35.1 35.1 35.1 35.1
K 60.3 66.7 66.7 82.6 82.6 88.9
Number of L 4 4 4 4 4 4
Diameter Of L 15.9 15.9 15.9 22.2 22.2 22.2
NPS 3/4 blind flange
Class 150# 300# 600# 900# 1500# 2500#
Diameter Of D 100 115 115 130 130 140
B 12.8 15.9 22.3 31.8 31.8 38.2
G 42.9 42.9 42.9 42.9 42.9 42.9
 K 69.9 82.6 82.6 88.9 88.9 95
Number of L 4 4 4 4 4 4
Diameter Of L 15.9 19.1 19.1 22.2 22.2 22.2
NPS 1 blind flange
Class 150# 300# 600# 900# 1500# 2500#
Diameter Of D 110 125 125 150 150 160
B 14.3 17.5 23.9 35 35 41.4
DIA G 50.8 50.8 50.8 50.8 50.8 50.8
DIA K 79.4 88.9 88.9 101.6 101.6 107.4
Number of L 4 4 4 4 4 4
Diameter Of L 15.9 19.1 19.1 25.4 25.4 25.4
NPS 1.1/4 blind flange
Class 150# 300# 600# 900# 1500# 2500#
Diameter Of D 115 135 135 160 160 185
B 15.9 19.1 27.1 35 35 44.5
DIA G 63.5 63.5 63.5 63.5 63.5 63.5
DIA K 88.9 98.4 98.4 111.1 111.1 130
Number of L 4 4 4 4 4 4
Diameter Of L 15.9 19.1 19.1 25.4 25.4 28.6
NPS 1.1/2 blind flange
Class 150# 300# 600# 900# 1500# 2500#
Diameter Of D 125 155 155 180 180 205
B 17.5 20.7 28.7 38.2 38.2 50.9
DIA G 73 73 73 73 73 73
DIA K 98.4 114.3 114.3 123.8 123.8 146
Number of L 4 4 4 4 4 4
Diameter Of L 15.9 22.2 22.2 28.6 28.6 31.8
NPS 2 blind flange
Class 150# 300# 600# 900# 1500# 2500#
Diameter Of D 150 165 165 215 215 235
B 19.1 22.3 31.8 44.5 44.5 57.3
DIA G 91.9 91.9 91.9 91.9 91.9 91.9
DIA K 120.7 127 127 165.1 165.1 171.4
Number of L 4 8 8 8 8 8
Diameter Of L 19.1 19.1 19.1 25.4 25.4 28.6
NPS 2.1/2 blind flange
Class 150# 300# 600# 900# 1500# 2500#
Diameter Of D 180 190 190 245 245 265
B 22.3 25.5 35 47.7 47.7 63.6
DIA G 104.6 104.6 104.6 104.6 104.6 104.6
DIA K 139.7 149.2 149.2 190.5 190.5 197
Number of L 4 8 8 8 8 8
Diameter Of L 19.1 22.2 22.2 28.6 28.6 31.8
NPS 3 blind flange
Class 150# 300# 600# 900# 1500# 2500#
Diameter Of D 190 210 210 240 265 305
B 23.9 28.6 38.2 44.5 54.1 73.1
DIA G 127 127 127 127 127 127
DIA K 152.4 168.3 168.3 190.5 205 230
Number of L 4 8 8 8 8 8
Diameter Of L 19.1 22.2 22.2 25.4 31.8 34.9
NPS 3.1/2 blind flange
Class 150# 300# 600# 900# 1500# 2500#
Diameter Of D 215 230 230
B 23.9 30.2 41.4
DIA G 139.7 139.7 139.7
DIA K 177.8 184.2 184.2
Number of L 8 8 8
Diameter Of L 19.1 22.2 25.4
NPS 4 blind flange
Class 150# 300# 600# 900# 1500# 2500#
Diameter Of D 230 255 275 290 310 355
B 23.9 31.8 44.5 50.9 60.4 82.6
DIA G 157.2 157.2 157.2 157.2 157.2 157.2
DIA K 190.5 200 215.9 235 240 273
Number of L 8 8 8 8 8 8
Diameter Of L 19.1 22.2 25.4 31.8 34.9 41.3
NPS 6 blind flange
Class 150# 300# 600# 900# 1500# 2500#
Diameter Of D 280 320 355 380 395 485
B 25.5 36.6 54.3 62 89 114.4
DIA G 215.9 215.9 215.9 215.9 215.9 215.9
DIA K 241.3 269.9 292.1 317.5 320 368
Number of L 8 12 12 12 12 8
Diameter Of L 22.2 22.2 28.6 31.8 38.1 54
NPS 8 blind flange
Class 150# 300# 600# 900# 1500# 2500#
Diameter Of D 345 380 420 470 485 550
B 28.6 41.3 62 69.9 98.5 133.4
DIA G 269.9 269.7 269.7 269.7 269.7 269.7
DIA K 298.5 330.2 349.2 393.7 395 438.1
Number of L 8 12 12 12 12 12
Diameter Of L 22.2 25.4 31.8 38.1 44.5 54
NPS 10 blind flange
Class 150# 300# 600# 900# 1500# 2500#
Diameter Of D 405 445 510 545 585 675
B 30.2 47.7 69.9 76.3 114.4 171.5
DIA G 323.9 323.9 323.9 323.9 323.9 323.9
DIA K 362 387.4 431.8 469.9 485 539.7
Number of L 12 16 16 16 12 12
Diameter Of L 25.4 28.6 34.9 38.1 50.8 66.7
NPS 12 blind flange
Class 150# 300# 600# 900# 1500# 2500#
Diameter Of D 485 520 560 610 675 760
B 31.8 50.9 73.1 85.8 130.3 190.6
DIA G 381 381 381 381 381 381
DIA K 431.8 450.8 489 533.4 571.5 619.1
Number of L 12 16 20 20 16 12
Diameter Of L 25.4 31.8 34.9 38.1 54 73
NPS 14 blind flange
Class 150# 300# 600# 900# 1500# 2500#
Diameter Of D 535 585 605 640 750
B 35 54 76.3 92.2 139.8
DIA G 412.8 412.8 412.8 412.8 412.8
DIA K 476.3 514.4 527 558.8 635
Number of L 12 20 20 20 16
Diameter Of L 28.6 31.8 38.1 41.3 60.3
NPS 16 blind flange
Class 150# 300# 600# 900# 1500# 2500#
Diameter Of D 595 650 685 705 825
B 36.6 57.2 82.6 95.3 152.5
DIA G 469.9 469.9 469.9 469.9 469.9
DIA K 539.8 571.5 603.2 616 705
Number of L 16 20 20 20 16
Diameter Of L 28.6 34.9 41.3 44.5 66.7
NPS 18 blind flange
Class 150# 300# 600# 900# 1500# 2500#
Diameter Of D 635 710 745 785 915
B 39.7 60.4 89 108 168.4
DIA G 533.4 533.4 533.4 533.4 533.4
DIA K 577.9 628.6 654 685.8 775
Number of L 16 24 20 20 16
Diameter Of L 31.8 34.9 44.5 50.8 73
NPS 20 blind flange
Class 150# 300# 600# 900# 1500# 2500#
Diameter Of D 700 775 815 855 985
B 42.9 63.6 95.3 114.4 184.2
DIA G 584.2 584.2 584.2 584.2 584.2
DIA K 635 685.8 723.9 749.3 831.8
Number of L 20 24 24 20 16
Diameter Of L 31.8 34.9 44.5 54 79.4

 

Dimensional tolerances of ASME B16.5 blind flange

Tolerances Of Out Side Diameter Inner Diameter Hub O.D. Drilling
  • ≤ 24 = 1.6 mm
  • 24 = ± 3.2 millimeter
  • not applicable
  • ≤ 12 = + 2.4 (mm) – 1.6 mm
  • ≥ 14 = ± 3.2 (mm)
  • Spacing Of Bolt Hole = ± 0.8 millimeter
  • Bolt Circle (B.C.) = 1.6 mm
Bolt Circle (B.C.) Eccentricity Wall Thickness Length Of thru Hub Contact Face Diameter
  • ≤ 2.1/2 = 0.8 (mm) maximum
  • ≥ 3 = 1.6 mm, maximum
  • ≤ 18 = + 3.2 (mm) / – 0
  • ≥ 20 = + 4.8 (mm) / – 0
  • ≤ 18 = + 3.2 mm / – 0.8 millimeter
  • ≥ 20 = + 4.8 mm / – 1.6 mm
  • 1.6 mm RF = ± 0.8 (mm)
  • 6.35 mm Raised Face (RF)
  • Male-Female & Tongue and Groove ± 0.4 millimeter

 

EN 1092-1 Type 05 blind flange weight

Weight in KG

DN PN 2.5 PN6 PN 10 PN 16 PN25
10 0.38 0.722 0.722 0,722 0,722
15 0.438 0.813 0.813 0,813 0,813
20 0.657 1.14 1.14 1,14 1,14
25 0.821 1.38 1.38 1,38 1,38
32 1.18 2.03 2.03 2,03 2,03
40 1.39 2.35 2.35 2,35 2,35
50 1.62 2.88 2.88 2,88 3,20
65 2.14 3.15 3.51 3,51 4,29
80 3.43 4.61 4.61 4,61 5,54
100 4.22 5.65 5.65 5,65 7,60
125 6.10 8.13 8.13 8,13
150 7.51 10.5 10.5 10,5
200 12.3 16.2

 

Blind flange weight chart & dimensions

 

Why pay more if you can get carbon steel blank flange at the best price in Dubai and buy only after checking the weight chart and price list

  • At the top, you will get information about the manufacturer who manufactured the material.
  • The heat number or lot number is specified in the test. All the material properties including chemical properties, mechanical properties, etc., are linked with the heat number. These properties are known as the technical delivery conditions.
  • The test report also contains the material specification and grade. While reading the reports, these should be matched with the minimum requirements given in material specification for technical and delivery conditions.
  • The MTC should also comply with the delivery conditions, like manufacturing process, type of flange, etc.
  • It also has a material dimension.
  • The mechanical properties will be present in the MTC for each heat number.

Each client should read and understand the MTC report before accepting the delivery of the Tapped Blind Flange.

The primary purpose of any Ss Blind Flange is to terminate the flow inside a pipe. In refinery & petrochemical industry it can be used at the time of maintenance or inspection of the pipe line.

There are two types of Pipe Blind Flange namely flat face and raised face blind flange.

Refer ANSI/ ASME b16.5 blind flange dimensions and ASTM A182 F304 blind flange pressure rating and super duplex flat face blind flange sizes

Corrosion on Blank Flange can depend on various factors, like the material of the flange, the environment where it is used and under which condition.

Always check NDT test report before buying raised face blind flange in high temp alloys like Inconel, Hastelloy and Monel

The Asme B16.5 Blind Flange manufacturing process would include processing the raw material and then forming them to the accurate shape. Once done, it can be casted, cut from a rolled plate material, or forged.

The primary advantage of Duplex Steel Blind Flanges is that it helps to terminate the flow on site when the valves might be located hundreds of miles away from the actual job site.