BLRF Flange,Blind flange


 Blind flange is a kind of round plate with no center hole but with all the proper bolt holes. It is used to blank off the ends of piping, valves and pressure vessel opening. From the standpoint of internal pressure and bolt loading, blind flanges, particularly in the larger sizes, are the most highly stressed of all flange types; however, since the maximum stresses in a blind flange are bending stresses at the center, they can safely be permitted to be higher than in other types of flanges. 

Materials used:Some materials used in the manufacturing of blind flanges are as follows: 

  • Stainless Steel
  • Nickel Alloy
  • Titanium
  • Carbon Steel
  • Cast Iron
  • Brass
  • Bronze
  • Steel
  • Aluminum
  • Polypropylene
  • Silicone
  • Features of blind flanges:Some important features of blind flanges are as follows:

 

BLRF Flange,Blind flange

BLRF Flange,Blind flange

Blind Flange
Features of blind flanges:Some important features of blind flanges are as follows:
  •  
  • Blind flanges are sometimes supplied with NPT fittings which allow pressure test connections to be fitted.
  • They are used to blank off the ends of pipe.
  • They are also used to blank off the ends of valves and pressure vessel opening.
  • Considering factors like internal pressure and bolt loading, blind flanges, especially in the larger sizes, are the most highly stressed of all types of flanges.
  • Since the maximum stresses in a blind flange are bending stresses at the center, they can safely be allowed to be higher than in other types of flanges.
  • Blind flanges are made to fit standard pipes in all sizes.
  •  

They may often be supplied with NPT fittings to allow pressure test connections to be fitted.

These Flanges are available in the following range.
Stainless Steel: ASTM A182 F304, F304L, F304H, F316, F316L, F316Ti, F310, F310S, F321, F321H, F317, F347, F347H, F904L.
Duplex Stainless Steel: UNS S31803, UNS S32750 
Carbon Steel: ASTM A105,
Alloy Steel: ASTM A182 F1, F11, F22, F5, F9, F91
Nickel Alloys: Monel 400 & 500, Inconel 600 & 625, Incoloy 800, 825, Hastelloy C22, C276
Copper Alloys: Copper, Brass & Gunmetal
Size: 1/8" NB TO 48"NB.
Sch: 5s, 10s, 10, 20, 40s, 40, STD, 60, 80s, 80, XS, 100, 120, 140, 160, XXS
Class: 150#, 300#, 400#, 600#, 900#, 1500#, 2500#
Dimensional Standard
ANSI: ANSI B16.5, ANSI B16.47, MSS SP44, ANSI B16.36, ANSI B16.48
DIN: DIN 2527, DIN 2566, DIN 2573, DIN 2576, DIN 2641, DIN 2642, DIN 2655, DIN 2656, DIN 2627, DIN 2628, DIN 2629, DIN 2631, DIN 2632, DIN 2633, DIN 2634, DIN 2635, DIN 2636, DIN 2637, DIN 2638, DIN 2673
B.S: BS 4504, BS4504, BS1560, BS10


blind flange suppliers

DIMENSIONS of CLASS 150 FLANGES AS PER ANSI B 16.5
NB D B G K L No. of Holes
½” 15 88.9 11.1 34.9 60.3 15.9 4
¾” 20 98.4 12.7 42.9 69.8 15.9 4
1” 25 107.9 14.3 50.8 79.4 15.9 4
1 ¼” 32 117.5 15.9 63.5 88.9 15.9 4
1 ½” 40 127.0 17.5 73.0 98.4 15.9 4
2” 50 152.4 19.0 92.1 120.6 19.0 4
2 ½” 65 177.8 22.2 104.8 139.7 19.0 4
3” 80 190.5 23.8 127.0 152.4 19.0 4
4” 100 230.0 23.8 157.2 190.5 19.0 8
5” 125 254.0 23.8 185.7 215.9 22.2 8
6” 150 279.4 25.4 215.9 241.3 22.2 8
8” 200 342.9 28.6 269.9 298.4 22.2 8
10” 250 406.4 30.2 323.8 361.9 25.4 12
12” 300 482.6 31.8 381.0 431.8 25.4 12
14” 350 533.4 34.9 412.7 476.2 28.6 12
16” 400 596.9 36.5 469.9 539.7 28.6 16
18” 450 635.0 39.7 533.4 577.8 31.7 16
20” 500 698.5 42.9 584.2 635.0 31.7 20
24” 600 812.8 47.6 692.1 749.3 34.9 20

 

DIMENSIONS of CLASS 300 FLANGES AS PER ANSI B 16.5
NB D B G K L No. of Holes
½” 15 95.2 14.3 34.9 66.7 15.9 4
¾” 20 117.5 15.9 42.9 82.5 19.0 4
1” 25 123.8 17.5 50.8 88.9 19.0 4
1 ¼” 32 133.3 19.0 63.5 98.4 19.0 4
1 ½” 40 155.6 20.6 73.0 114.3 22.2 4
2” 50 165.1 22.2 92.1 127.0 19.0 8
2 ½” 65 190.5 25.4 104.8 149.2 22.2 8
3” 80 209.5 28.6 127.0 168.3 22.2 8
4” 100 254.0 31.8 157.2 200.0 22.2 8
5” 125 279.4 34.9 185.7 234.9 22.2 8
6” 150 317.5 36.5 215.9 269.9 22.2 12
8” 200 381.0 41.3 269.9 330.2 25.4 12
10” 250 444.5 47.6 323.8 387.3 28.6 16
12” 300 520.7 50.8 381.0 450.8 31.7 16
14” 350 584.2 54.0 412.7 514.3 31.7 20
16” 400 647.7 57.2 469.9 571.5 34.9 20
18” 450 711.2 60.3 533.4 628.5 34.9 24
20” 500 774.7 63.5 584.2 685.8 34.9 24
24” 600 914.4 69.8 692.1 812.8 41.3 24

 

DIMENSIONS of CLASS 600 FLANGES AS PER ANSI B 16.5
NB D B G K L No. of Holes
½” 15 95.2 14.3 34.9 66.7 15.9 4
¾” 20 117.5 15.9 42.9 82.5 19.0 4
1” 25 123.8 17.5 50.8 88.9 19.0 4
1 ¼” 32 133.3 20.6 63.5 98.4 19.0 4
1 ½” 40 155.6 22.2 73.0 114.3 22.2 4
2” 50 165.1 25.4 92.1 127.0 19.0 8
2 ½” 65 190.5 28.6 104.8 149.2 22.2 8
3” 80 209.5 31.8 127.0 168.3 22.2 8
4” 100 273.0 38.1 157.2 215.9 25.4 8
5” 125 330.2 44.4 185.7 266.7 28.6 8
6” 150 355.6 47.6 215.9 292.1 28.6 12
8” 200 419.1 55.6 269.9 349.2 31.7 12
10” 250 508.0 63.5 323.8 431.8 34.9 16
12” 300 558.8 66.7 381.0 488.9 34.9 20
14” 350 603.2 69.9 412.7 527.0 38.1 20
16” 400 685.8 75.2 469.9 603.2 41.3 20
18” 450 742.9 82.6 533.4 654.0 44.4 20
20” 500 812.8 88.9 584.2 723.9 44.4 24
24” 600 939.8 101.6 692.1 838.2 50.8 24
 

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