Blind Flanges

  • Size: 1/2″ thru 24″ or custom size.
  • Material: Nickel Alloy,Hastelloy Alloy,Monel Alloy,Inconel Allo, Anti-Corrosion Resistant Alloy, Super-Alloy, Duplex Steel, Stainless steel, Titanium Alloy, Copper Alloy, Carbon Steel, Aluminium Steel, ect.
  • Standard: A WWA C207, ASME B16.5, DIN, BS, JIS, EN1092-1, ASME B16.47 and GOST/ГОСТ Standard, etc..
  • Approved by CE, RoHs, SGS, BV
  • Large stock with different sizes

Blind Flanges Solutions

One solution for using blind flanges is to use them in conjunction with a gasket. The gasket is placed between the flanges and serves as a sealing mechanism to prevent leaks. The gasket can be made of a variety of materials, including rubber, metal, and non-metallic materials. The type of gasket used will depend on the specific application and the type of fluid or gas that is being transported through the piping system. Another solution for using blind flanges is to weld them onto the end of a pipe. This method is typically used when there is no need for the flange to be removed or replaced, such as in permanent piping installations. The welding process creates a strong and permanent seal that is able to withstand high pressures and temperatures. However, it is important to ensure that the welding is done properly by a trained and certified welder to prevent leaks and other issues. In addition to their use in piping systems, blind flanges can also be used in other applications, such as in the construction of pressure vessels and storage tanks. They can be used to seal off the openings of these structures, providing a reliable and robust barrier against leaks and other issues. Overall, blind flanges are a versatile and essential component in many industrial and commercial applications. They provide a reliable and effective way to seal off the ends of piping systems and pressure vessels, helping to prevent leaks and ensure the safe and efficient operation of these systems.

Table of Contents

What are Blind Flanges?

Blind flanges (also called a ‘closure plate flanges’) are pipe flanges that are used to seal off the end of a piping system. They are typically used in situations where the end of the pipe needs to be sealed off or blocked, such as when making a connection to a valve or pressure vessel. Blind flanges are solid and do not have a bore, or hole, in the center like other types of flanges. This makes them useful for blocking off the flow of fluid or gas in a piping system. Because they do not have a bore, BL flanges are not used for piping that carries fluids or gases. Instead, they are used for applications such as pressure testing or as a mechanism to access the inside of a pipe for maintenance or cleaning. They are typically used in high-pressure applications and are often rated to withstand pressures of up to several thousand pounds per square inch.

20221213030906 35428 - Blind Flanges

Standard Specication For Blind Flanges

  • Dimensions: ANSI B16.5, ANSI B16.47 Series A & B, MSS SP44, ASA, API-605, AWWA, Custom Drawings
  • Size : 1/2″ (15 NB) to 48″ (1200NB)
  • Class : 150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS, DIN Standard ND-6,10, 16, 25, 40 Etc.
  • 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
  • Flange Face Type : Flate Face (FF), Raised Face (RF), Ring Type Joint (RTJ)

Advantages and disadvantage of Blind Flanges

Some advantages of blind flanges include their ability to be easily installed and removed, as well as their versatility in terms of being able to connect to different types of pipes. Another advantage of blind flanges is that they can be easily sealed to prevent the passage of fluid or gas. One potential disadvantage of blind flanges is that they are not able to be used for operations that require the passage of fluid or gas through the end of the piping system. Additionally, blind flanges may not be suitable for applications that require high levels of pressure, as they may not be able to withstand the pressure without leaking or bursting.

What are the different types of sealing faces used on blind flanges?

Sealing faces are an important part of a BL flange, as they help to create a seal between the flange and the mating surface. The type of sealing face used on a blind flange will depend on the specific application and the type of fluid or gas being transported.

  • Flat face blind flanges are the most common type of sealing face, and are typically used for low-pressure applications. The flat face flange has a flat sealing surface, with no raised or recessed areas.
  • Raised face blind flanges have a small raised area around the bolt hole, which helps to create a better seal. They are often used in higher-pressure applications.
  • Male and female face blind flanges are also used in higher-pressure applications. Male face flanges have a raised area around the bolt hole, while female face flanges have a recessed area.
  • Right joint face blind flanges are used in applications where the flange will be bolted to a flat surface. They have a flat sealing surface with no raised or recessed areas.
  • Tongue and groove face blind flanges are used in applications where the flange will be bolted to a pipe or other cylindrical surface. They have a tongue-and-groove style sealing surface, which helps to create a better seal.

In general, the type of sealing face used on a blind flange will depend on the specific application and the pressure and temperature of the fluid or gas being transported. It’s important to choose the right type of sealing face to ensure that the flange provides a reliable and effective seal.

Material of Blind Flanges

Blind Flanges are typically made from cast or forged carbon steel, stainless steel, or other alloy materials. The specific material used will depend on the application and the design specifications of the flange. It is important to choose the right material for a flange to ensure that it is strong and durable enough to handle the pressure and temperature conditions it will be subjected to in service.

Carbon Steel Blind Flange ASTM/ASME A/SA105 A/SA105N & A/SA216-WCB, DIN 1.0402, DIN 1.0460, DIN 1.0619, Die Steel, ASTM A105 / ASME SA105, A105N, ASTM A350 LF2 / ASME SA350, High Yield CS ASTM A694 / A694 (F52 F56 F60 F65 F70 F80)
Stainless Steel Blind Flange ASTM/ASME A/SA182 F304, F304L, F316, F316L, ASTM/ASME A/SA351 CF8, CF3, CF8M, CF3M, DIN 1.4301, DIN 1.4306, DIN 1.4401, DIN 1.4404, DIN 1.4308, DIN 1.4408, DIN 1.4306, DIN 1.4409
Alloy Steel Blind Flange ASTM A182 / ASME SA182 F5, F9, F11, F12, F22, F91
Titanium Blind Flange ASTM B381 / ASME SB381, Titanium Gr. 1, Titanium Gr. 2, Titanium Gr. 4, Titanium Gr. 5, Titanium Gr. 7 ASTM R50250/GR.1 | R50400/GR.2 | R50550/GR.3 | R50700/GR.4 | GR.6 |R52400/GR.7 | R53400/GR.12 | R56320/GR.9 |R56400/GR.5
Copper Blind Flange T1, T2, C10100, C10200, C10300, C10400, C10500, C10700, C10800, C10910,C10920, TP1, TP2, C10930, C11000, C11300, C11400, C11500, C11600, C12000,C12200, C12300, TU1, TU2, C12500, C14200, C14420, C14500, C14510, C14520, C14530, C17200, C19200, C21000, C23000, C26000, C27000, C27400, C28000, C33000, C33200, C37000, C44300, C44400, C44500, C60800, C63020, C68700, C70400, C70600, C70620, C71000, C71500, C71520, C71640, etc
Copper Nickel Blind Flange ASTM / ASME SB 61 / 62 / 151 / 152, Copper Nickel 90/10 (C70600 ), Cupro Nickel 70/30 (C71500), UNS C71640
Brass Blind Flange 3602 / 2604 / H59 / H62 / etc.
Inconel Blind Flange ASTM B564 / ASME SB564, Inconel 600, 601, 625, 718, 783, 690, x750
Hastelloy Blind Flange ASTM B564 / ASME SB564, Hastelloy C276 (UNS N10276), C22 (UNS N06022), C4, C2000, B2, B3, X
Monel Blind Flange ASTM B564 / ASME SB564, Monel 400 (UNS No. N04400), Monel 500 (UNS No. N05500)
Alloy 20 Blind Flange ASTM B462 / ASME SB462, Carpenter® 20 Alloy, Alloy 20Cb-3
Aluminium Blind Flange 5052 /6061/ 6063 / 2017 / 7075 / etc.
Nickel Blind Flange ASTM B564 / ASME SB564, Nickel 200, Nickel 201, Nickel 205, Nickel 205LC
Duplex Blind Flange S31803 / S32205 A182 Gr F51 / F52 / F53 / F54 / F55 / F57 / F59 / F60 / F61
Super Duplex Blind Flange S32750 / S32760 A182 Gr F51 / F52 / F53 / F54 / F55 / F57 / F59 / F60 / F61
Incoloy Blind Flange ASTM B564 / ASME SB564, Incoloy 800, 800H, 800HT (UNS N08800), 825 (UNS N08825), 925
254 Smo Blind Flange ASTM A182 / ASME SA182, SMO 254/6Mo, UNS S31254, DIN 1.4547
Nimonic Blind Flange Nimonic 75, Nimonic 80A, Nimonic 90
Other Blind Flange material Tin bronze, Alumunum bronze, Lead bronze

Size of Blind Flanges

The size of a blind flange is determined by the size of the opening it is used to seal. For example, a blind flange with a 4-inch diameter would be used to seal a 4-inch pipe or opening. The size of the flange itself will typically be slightly larger than the opening it is used to seal, to ensure a tight fit.

Dimensions of Blind Flanges

The dimensions of a blind flange will depend on the specific application and the size of the pipe or fitting it is being used with. In general, the flange will have a diameter that is equal to the outer diameter of the pipe, and it will have bolt holes spaced around the circumference of the flange to allow it to be securely attached to the pipe or fitting. The thickness of the flange will also vary depending on the pressure rating and the material it is made from.

Dimensions of ASME B16.5 Blind Flange

20221213020255 51608 - Blind Flanges  

Class 150 Blind Flange Dimensions

Nominal

 

Pipe

 

Size
“A”

 

(O.D.)

 

“B”

 

(Thk.)

 

“C”

 

(RF Dia.)

 

“D”

 

(B.C.D.)

 

# Bolt

 

Holes

 

Dia. of

 

Bolt Holes

 

Approx.

 

Weight

 

1/2″ 3-1/2 7/16 1-3/8 2-3/8 4 5/8 2
3/4″ 3-7/8 1/2 1-11/16 2-3/4 4 5/8 2
1″ 4-1/4 9/16 2 3-1/8 4 5/8 2
1-1/4″ 4-5/8 5/8 2-1/2 3-1/2 4 5/8 3
1-1/2″ 5 11/16 2-7/8 3-7/8 4 5/8 3
2″ 6 3/4 3-5/8 4-3/4 4 3/4 4
2-1/2″ 7 7/8 4-1/8 5-1/2 4 3/4 7
3″ 7-1/2 15/16 5 6 4 3/4 9
3-1/2″ 8-1/2 15/16 5-1/2 7 8 3/4 13
4″ 9 15/16 6-3/16 7-1/2 8 3/4 17
5″ 10 15/16 7-5/16 8-1/2 8 7/8 20
6″ 11 1 8-1/2 9-1/2 8 7/8 27
8″ 13-1/2 1-1/8 10-5/8 11-3/4 8 7/8 47
10″ 16 1-3/16 12-3/4 14-1/4 12 1 67
12″ 19 1-1/4 15 17 12 1 123
14″ 21 1-3/8 16-1/4 18-3/4 12 1-1/8 139
16″ 23-1/2 1-7/16 18-1/2 21-1/4 16 1-1/8 187
18″ 25 1-9/16 21 22-3/4 16 1-1/4 217
20″ 27-1/2 1-11/16 23 25 20 1-1/4 283
24″ 32 1-7/8 27-1/4 29-1/2 20 1-3/8 415
1/16″ raised face included in flange thickness.

Class 300 Blind Flange Dimensions

Nominal

 

Pipe

 

Size
“A”

 

(O.D.)

 

“B”

 

(Thk.)

 

“C”

 

(RF Dia.)

 

“D”

 

(B.C.D.)

 

# Bolt

 

Holes

 

Dia. of

 

Bolt Holes

 

Approx.

 

Weight

 

1/2″ 3-3/4 9/16 1-3/8 2-5/8 4 5/8 2
3/4″ 4-5/8 5/8 1-11/16 3-1/4 4 3/4 3
1″ 4-7/8 11/16 2 3-1/2 4 3/4 4
1-1/4″ 5-1/4 3/4 2-1/2 3-7/8 4 3/4 6
1-1/2″ 6-1/8 13/16 2-7/8 4-1/2 4 7/8 7
2″ 6-1/2 7/8 3-5/8 5 8 3/4 8
2-1/2″ 7-1/2 1 4-1/8 5-7/8 8 7/8 12
3″ 8-1/4 1-1/8 5 6-5/8 8 7/8 16
3-1/2″ 9 1-3/16 5-1/2 7-1/4 8 7/8 21
4″ 10 1-1/4 6-3/16 7-7/8 8 7/8 28
5″ 11 1-3/8 7-5/16 9-1/4 8 7/8 37
6″ 12-1/2 1-7/16 8-1/2 10-5/8 12 7/8 48
8″ 15 1-5/8 10-5/8 13 12 1 79
10″ 17-1/2 1-7/8 12-3/4 15-1/4 16 1-1/8 122
12″ 20-1/2 2 15 17-3/4 16 1-1/4 183
14″ 23 2-1/8 16-1/4 20-1/4 20 1-1/4 241
16″ 25-1/2 2-1/4 18-1/2 22-1/2 20 1-3/8 315
18″ 28 2-3/8 21 24-3/4 24 1-3/8 414
20″ 30-1/2 2-1/2 23 27 24 1-3/8 515
24″ 36 2-3/4 27-1/4 32 24 1-5/8 800
1/16″ raised face included in flange thickness.

Class 600 Blind Flange Dimensions

ANSI/ASME/ASA B16.5 600lb/sq.in. Flange BLIND-RF
ø D b g k Holes l Kg.
1/2″ 95,2 14,3 34,9 66,7 4 15,9 0,700
3/4″ 117,5 15,9 42,9 82,5 4 19,0 1,200
1″ 123,8 17,5 50,8 88,9 4 19,0 1,500
1 1/4″ 133,3 20,6 63,5 98,4 4 19,0 2,000
1 1/2″ 155,6 22,2 73,0 114,3 4 22,2 3,200
2″ 165,1 25,4 92,1 127,0 8 19,0 4,300
2 1/2″ 190,5 28,6 104,8 149,2 8 22,2 6,000
3″ 209,5 31,7 127,0 168,3 8 22,2 8,000
3 1/2″ 228,6 34,9 139,7 184,1 8 25,4 10,500
4″ 273,0 38,1 157,2 215,9 8 25,4 18,000
5″ 330,2 44,4 185,7 266,7 8 28,6 28,500
6″ 355,6 47,6 215,9 292,1 12 28,6 35,500
8″ 419,1 55,6 269,9 349,2 12 31,7 58,000
10″ 508,0 63,5 323,8 431,8 16 34,9 98,000
12″ 558,8 66,7 381,0 488,9 20 34,9 125,000
14″ 603,2 69,8 412,7 527,0 20 38,1 151,000
16″ 685,8 76,2 469,9 603,2 20 41,3 215,000
18″ 742,9 82,5 533,4 654,0 20 44,4 287,000
20″ 812,8 88,9 584,2 723,9 24 44,4 366,000
22″ 869,9 95,2 641,2 777,9 24 47,6 437,000
24″ 939,8 101,6 692,1 838,2 24 50,8 532,000

ASME/ ANSI B16.5 1500lb Blind Flange

Pipe Normal Diam. O.D. Flange Thk. Of Flange Min Diam.ofHub Diam.of BoltCircle Diam.of BoltHoles Numberof Bolts Diam. ofBolts(inch) Approx. Weight
inch dn O C X BC BH BN BD KG/PCS LB/PCS
1/2 15 120.7 22.4 38.1 82.6 22.4 4 3/4 1.9 4.2
3/4 20 130 25.4 44.5 88.9 22.4 4 3/4 2.7 6
1 25 149.4 28.4 52.3 101.6 25.4 4 7/8 3.7 8.1
1-1/4 32 158.8 28.4 63.5 111.3 25.4 4 7/8 4.3 9.5
1-1/2 40 177.8 31.8 69.9 124 28.4 4 1 5.9 13
2 50 215.9 38.1 104.6 165.1 25.4 8 7/8 11.3 24.9
2-1/2 65 244.3 41.1 124 190.5 28.4 8 1 16 35.2
3 80 266.7 47.8 133.4 190.5 25.4 8 7/8 19.5 43
4 100 311.2 53.8 162.1 235 31.8 8 1 1/8 33 72.8
5 125 374.7 73.2 196.9 279.4 35.1 8 1 1/4 60 132
6 150 393.7 82.6 228.6 317.5 31.8 12 1 1/8 75 165
8 200 482.6 91.9 292.1 393.7 38.1 12 1 3/8 125 275
10 250 584.2 108 368.3 469.9 38.1 16 1 3/8 215 474
12 300 673.1 124 450.9 533.4 38.1 20 1 3/8 316 697
14 350 749.3 133.4 495.3 558.8 41.1 20 1 1/2
16 400 825.5 146.1 552.5 616 44.5 20 1 5/8
18 450 914.4 162.1 596.9 685.8 50.8 20 1 7/8
20 500 984.3 177.8 641.4 749.3 53.8 20 2
24 600 1168.4 203.2 762 901.7 66.5 20 2 1/2

Note:

  • 1) Blind Flanges may be made with the same hub as that used for Slip-on Flanges or without hub.

ASME/ANSI B16.5 2500lb Blind Flange

Pipe Normal Diam. O.D. Flange Thk. Of Flange Min Diam.of BoltCircle Diam.of BoltHoles Numberof Bolts Diam. ofBolts(inch) KG LB
inch dn O C BC BH BN BD
1/2 15 133.4 30.2 88.9 22.4 4 3/4 3 7
3/4 20 139.7 31.8 95.3 22.4 4 3/4 4.5 10
1 25 158.8 35.1 108 25.4 4 7/8 5 12
1-1/4 32 184.2 38.1 130 28.4 4 1 8 18
1-1/2 40 203.2 44.5 146.1 31.8 4 1 1/8 11 25
2 50 235 50.8 171.5 28.4 8 1 17 38
2-1/2 65 266.7 57.2 196.9 31.8 8 1 1/8 25 55
3 80 304.8 66.5 228.6 35.1 8 1 1/4 39 86
4 100 355.6 76.2 273.1 41.1 8 1 1/2 60 133
5 125 419.1 91.9 323.9 47.8 8 1 3/4 101 223
6 150 482.6 108 368.3 53.8 8 2 156 345
8 200 552.5 127 438.2 53.8 12 2 242 533
10 250 673.1 165.1 539.8 66.5 12 2 1/2 465 1023
12 300 762 184.2 619.3 73.2 12 2 3/4 665 1463

Note:

  • 1) Blind Flanges may be made with the same hub as that used for Slip-on Flanges or without hub.

Dimensional Tolerances of ASME B16.5 Blind Flanges

Outside Diameter ≤ 24 = 1.6 mm | > 24 = ± 3.2 mm
Inside Diameter

 

not applicable

 

Diameter of Contact Face 1.6 mm Raised Face = ± 0.8 mm

6.35 mm Raised Face, Tongue & Groove / Male-Female = ± 0.4 mm

Outside Diameter of Hub

 

≤ 12 = + 2.4 mm / – 1.6 mm | ≥ 14 = ± 3.2 mm

 

Diameter of Counterbore not applicable
Drilling

 

Bolt Circle = 1.6 mm | Bolt Hole Spacing = ± 0.8 mm

 

Eccentricity of Bolt Circle with Respect to Facing

 

≤ 2½ = 0.8 mm max. | ≥ 3 = 1.6 mm max.

 

Thickness ≤ 18 = + 3.2 mm / – 0 | ≥ 20 = + 4.8 mm / – 0
Length thru Hub

 

≤ 18 = + 3.2 mm / – 0.8 mm | ≥ 20 = + 4.8 mm / – 1.6 mm

 

Notes

  • 1. Dimensions are in millimeters unless otherwise indicated.
  • 2. The length of the stud bolt does not include the height of the chamfers (points).

Dimensions of JIS Blind Flange

jis blind flange dimensions - Blind Flanges

JIS 5K Blind Flange Dimensions

Pipe Pipe Bo D t T G f r H X C Holes Bolt Dia.
inch mm
3/8 10 17.3 17.8 +0.5 -0 75 +1.0 -0 9 +1.0 -0 ±1.0 42 ±0.8 1 +2.0 -0 +2.0 -0 55 ±0.5 4 12
1/2 15 21.7 22.2 80 9 48 1 60 4 12
3/4 20 27.2 27.7 85 10 52 1 65 4 12
1 25 34.0 34.5 95 10 62 1 75 4 12
1-1/4 32 42.7 43.2 115 12 72 2 90 4 15
1-1/2 40 48.6 49.1 120 12 78 2 95 4 15
2 50 60.5 61.1 130 14 88 2 105 4 15
2-1/2 65 76.3 77.1 155 14 112 2 130 4 15
3 80 89.1 90.0 180 14 125 2 145 4 19
3-1/2 90 101.6 102.6 +1.0 -0 190 14 135 2 155 4 19
4 100 114.3 115.4 200 16 145 2 165 8 19
5 125 139.8 141.2 235 16 180 2 200 8 19
6 150 165.2 166.6 265 18 210 2 230 8 19
7 175 190.7 192.1 300 18 235 ±0.9 2 260 ±0.6 8 23
8 200 216.3 218.0 320 +1.5 -0 20 255 2 280 8 23
9 225 241.8 243.7 345 20 280 2 305 12 23
10 250 267.4 269.5 385 22 +1.5 -0 32 320 2 5 286 290 345 12 23
12 300 318.5 321.0 430 22 34 365 3 5 338 342 390 12 23
14 350 355.6 358.1 480 24 36 405 3 5 378 382 435 12 25
16 400 406.4 409.0 +1.5 -0 540 24 36 465 3 5 432 436 495 16 25
18 450 457.2 460.0 605 +2.0 -0 24 40 525 3 5 495 500 555 ±0.8 16 25
20 500 508.0 511.0 655 24 40 575 3 5 546 552 605 20 25
22 550 558.8 562.0 720 26 42 630 3 5 597 603 665 20 27
24 600 609.6 613.0 +2.0 -0 770 26 44 680 ±1.0 3 5 648 654 +2.5 -0 715 20 27
26 650 660.4 664.0 825 26 48 735 3 5 702 +2.5 -0 708 770 24 27
28 700 711.2 715.0 875 26 48 785 3 5 751 758 820 24 27
30 750 762.0 766.0 945 28 52 ±1.5 840 3 5 802 810 880 24 33
32 800 812.8 817.0 +2.5 -0 995 28 52 890 3 5 854 +3.0 -0 862 +3.0 -0 930 24 33
34 850 863.6 868.0 1045 +2.5 -0 28 54 940 3 5 904 912 980 ±1.0 24 33
36 900 914.4 919.0 1095 30 56 990 3 5 956 964 1030 24 33
40 1000 1016.0 1021.0 +3.0 -0 1195 32 60 1090 ±1.2 3 5 1058 +3.5 -0 1066 +3.5 -0 1130 28 33
44 1100 1117.6 1123.0 1305 32 1200 3 1240 28 33
48 1200 1219.2 1224.0 1420 34 1305 3 1350 32 33
54 1350 1371.6 1377.0 1575 +3.0 -0 34 1460 3 1505 ±1.5 32 33
60 1500 1524.0 1529.0 1730 36 1615 3 1660 36 33

JIS 10K Blind Flange Dimensions

Pipe Pipe Bo D t T G f r H X C Holes Bolt Dia.
inch mm
3/8 10 17.3 17.8 +0.5 -0 90 +1.0 -0 12 +1.0 -0 ±1.0 48 ±0.8 1 +1.5 -0 +1.5 -0 65 ±0.5 4 15
1/2 15 21.7 22.2 95 12 52 1 70 4 15
3/4 20 27.2 27.7 100 14 58 1 75 4 15
1 25 34.0 34.5 125 14 70 1 90 4 19
1-1/4 32 42.7 43.2 135 16 80 2 100 4 19
1-1/2 40 48.6 49.1 140 16 85 2 105 4 19
2 50 60.5 61.1 155 16 100 2 120 4 19
2-1/2 65 76.3 77.1 175 18 120 2 140 4 19
3 80 89.1 90.0 185 18 130 2 150 8 19
3-1/2 90 101.6 102.6 +1.0 -0 195 18 140 2 160 8 19
4 100 114.3 115.4 210 18 155 2 175 8 19
5 125 139.8 141.2 250 20 185 2 210 8 23
6 150 165.2 166.6 280 22 +1.5 -0 215 2 240 8 23
7 175 190.7 192.1 305 +1.5 -0 22 32 240 ±0.9 2 6 208 212 265 ±0.6 12 23
8 200 216.3 218.0 330 22 32 265 2 6 234 238 290 12 23
9 225 241.8 243.7 350 22 34 285 2 6 260 264 310 12 23
10 250 267.4 269.5 400 24 36 325 2 6 288 292 355 12 25
12 300 318.5 321.0 445 24 38 370 3 6 340 346 400 16 25
14 350 355.6 358.1 490 26 42 415 3 6 380 386 445 16 25
16 400 406.4 409.0 +1.5 -0 560 28 44 475 3 6 436 442 510 16 27
18 450 457.2 460.0 620 +2.0 -0 30 48 530 3 6 496 +2.0 -0 502 +2.0 -0 565 ±0.8 20 27
20 500 508.0 511.0 675 30 48 585 3 6 548 554 620 20 27
22 550 558.8 562.0 745 32 52 ±1.5 640 3 6 604 610 680 20 33
24 600 609.6 613.0 +2.0 -0 795 32 52 690 ±1.0 3 6 656 +2.5 -0 662 +2.5 -0 730 24 33
26 650 660.4 664.0 845 34 56 740 3 6 706 712 780 24 33
28 700 711.2 715.0 905 34 58 800 3 6 762 770 840 24 33
30 750 762.0 766.0 970 36 62 855 3 6 816 824 900 24 33
32 800 812.8 817.0 +2.5 -0 1020 +2.5 -0 36 64 905 3 6 868 +3.0 -0 876 +3.0 -0 950 28 33
34 850 863.6 868.0 1070 36 66 955 3 6 920 928 1000 ±1.0 28 33
36 900 914.4 919.0 1120 38 70 1005 ±1.2 3 6 971 979 1050 28 33
40 1000 1016.0 1021.0 +3.0 -0 1235 40 74 1110 3 6 1073 +3.5 -0 1081 +3.5 -0 1160 28 39
44 1100 1117.6 1123.0 1345 42 78 1220 3 8 1175 1185 1270 28 39
48 1200 1219.2 1224.0 1465 44 82 1325 3 8 1278 1290 1380 ±1.5 32 39
54 1350 1371.6 1377.0 1630 +3.0 -0 48 88 1480 3 8 1432 1450 1540 36 45
60 1500 1524.0 1529.0 1795 50 90 1635 3 8 1585 1600 1700 40 45

JIS 16K Blind Flange Dimensions

Pipe Pipe Bo D t T G f r H X C Holes Bolt Dia.
inch mm
3/8 10 17.3 17.8 +0.5 -0 90 +1.0 -0 12 +1.0 16 ±1.0 48 ±0.8 1 4 26 +1.0 -0 28 +1.0 -0 65 ±0.5 4 15
1/2 15 21.7 22.2 95 12 16 52 1 4 30 32 70 4 15
3/4 20 27.2 27.7 100 14 20 58 1 4 38 42 75 4 15
1 25 34.0 34.5 125 14 20 70 1 4 46 50 90 4 19
1-1/4 32 42.7 43.2 135 16 22 80 2 5 56 60 100 4 19
1-1/2 40 48.6 49.1 140 16 24 85 2 5 62 66 105 4 19
2 50 60.5 61.1 155 16 24 100 2 5 76 80 120 8 19
2-1/2 65 76.3 77.1 175 18 26 120 2 5 94 98 140 8 19
3 80 89.1 90.0 200 20 28 135 2 6 108 112 160 8 23
3-1/2 90 101.6 102.6 +1.0 -0 210 20 30 145 2 6 120 124 170 8 23
4 100 114.3 115.4 225 22 +1.5 -0 34 160 2 6 134 138 185 8 23
5 125 139.8 141.2 270 22 34 195 2 6 164 170 225 8 25
6 150 165.2 166.6 305 +1.5 -0 24 38 230 ±0.9 2 6 196 202 260 ±0.6 12 25
7 175 190.7 192.1 325 26 40 250 2 6 216 222 +1.5 -0 280 12 25
8 200 216.3 218.0 350 26 40 275 2 6 244 +1.5 -0 252 305 12 25
9 225 241.8 243.7 385 26 40 325 2 6 266 272 335 12 27
10 250 267.4 269.5 430 28 44 345 2 6 304 312 380 12 27
12 300 318.5 321.0 480 30 48 395 3 8 354 364 430 16 27
14 350 355.6 358.1 540 34 52 ±1.5 440 3 8 398 408 480 16 33
16 400 406.4 409.0 +1.5 -0 605 +2.0 -0 38 60 495 3 10 446 456 +2.0 -0 540 16 33
18 450 457.2 460.0 675 40 64 560 3 10 504 +2.0 -0 514 605 ±0.8 20 33
20 500 508.0 511.0 730 42 68 615 3 10 558 568 660 20 33
22 550 558.8 562.0 795 44 70 670 ±1.0 3 10 612 622 720 20 39
24 600 609.6 613.0 +2.0 -0 845 46 74 720 3 10 666 +2.5 -0 676 +2.5 -0 770 24 39
26 650 660.4 664.0 895 48 77 770 5 10 704 726 820 24 39
28 700 711.2 715.0 960 50 80 820 5 10 754 776 875 24 42
30 750 762.0 766.0 1020 +2.5 -0 52 +2.0 -0 83 880 5 10 806 832 935 24 42
32 800 812.8 817.0 +2.5 -0 1085 54 86 930 5 10 865 +3.0 -0 885 +3.0 -0 990 ±1.0 24 48
34 850 863.6 868.0 1135 56 89 980 5 10 916 936 1040 24 48
36 900 914.4 919.0 1185 58 93 1030 ±1.2 5 10 968 986 1090 28 48
40 1000 1016.0 1021.0 +3.0 -0 1320 62 99 1140 5 12 1070 +3.5 -0 1098 +3.5 -0 1210 28 56
44 1100 1117.6 1123.0 1420 66 105 ±2.0 1240 5 12 1180 1200 1310 32 56
48 1200 1219.2 1225.0 1530 +3.0 -0 70 112 1350 5 12 1282 1302 1420 ±1.5 32 56
52 1300 1320.8 1326.0 1645 74 1450 5 1530 32 62
54 1350 1371.6 1377.0 1700 76 1510 5 1590 32 62
56 1400 1422.4 1428.0 1755 78 1560 5 1640 36 62
60 1500 1524.0 1529.0 1865 80 1670 5 1750 36 62

Blind Flange Weight & Blind Flange Pressure Ratings

Blind Flange Weights by Pressure Class and Size
Pipe Size 150 # 300 # 600 # 900 # 1500 # 2500 #
WN SO BLD WN SO BLD WN SO BLD WN SO BLD WN SO BLD WN SO BLD
1/2″ 2 1 1 2 1 1 2 2 2 SEE 1500 # WEIGHTS 5 4 4 7 7 7
3/4″ 2 2 2 3 3 3 4 3 3 SEE 1500 # WEIGHTS 6 5 6 8 8 8
1″ 3 2 2 4 3 3 4 4 4 SEE 1500 # WEIGHTS 9 8 8 12 11 11
1 1/2″ 4 3 3 7 6 6 8 7 8 SEE 1500 # WEIGHTS 13 12 13 25 22 23
2″ 6 5 5 9 7 8 12 9 10 SEE 1500 # WEIGHTS 25 25 25 42 37 39
2 1/2″ 8 7 7 12 10 12 18 13 15 SEE 1500 # WEIGHTS 36 36 35 52 55 56
3″ 10 8 9 15 13 16 23 16 20 31 26 29 48 48 48 94 83 86
4″ 15 13 17 25 22 27 42 37 41 53 53 54 73 73 73 145 125 130
5″ 19 15 20 32 28 35 68 63 68 86 83 87 130 130 140 245 210 225
6″ 24 19 26 42 39 50 81 80 86 110 110 115 165 165 160 380 325 345
8″ 39 30 45 67 58 81 120 115 140 175 170 200 275 260 300 580 485 530
10″ 52 43 70 91 81 124 190 170 230 260 245 290 455 435 510 1075 930 1025
12″ 80 64 110 140 115 185 225 200 295 325 325 415 690 580 690 1525 1100 1300
14″ 110 90 140 180 165 250 280 230 355 400 400 520 940 NA 975 NA NA NA
16″ 140 98 180 250 190 295 390 330 495 495 425 600 1250 NA 1300 NA NA NA
18″ 150 130 220 320 250 395 475 400 630 680 600 850 1625 NA 1750 NA NA NA
20″ 180 165 285 400 315 505 590 510 810 830 730 1075 2050 NA 2225 NA NA NA
22″ 225 185 355 465 370 640 720 590 1000 NA NA NA NA NA NA NA NA NA
24″ 260 220 430 580 475 790 830 730 1250 1500 1400 2025 3325 NA 3625 NA NA NA
Conversion Data
• 1 inch = 25.44 mm • 1 mm = 0.03937 inches • 1 lb/ft^2 = 47.88 Pa • 1 psi = 6.8948 Pa • x°F = (5/9)(x-32)°C
• 1 pound = 0.45359 Kg • 1 Kg = 2.20462 pounds • 1 Pa = 0.020885 lb/ft^2 • 1 Pa = 0.00014504 psi • x°C = (9/5)x + 32°F

Manufacturing process of Blind Flanges

manufacturing process of blind flanges - Blind Flanges
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Production process of forged blind flange

The manufacturing process for forged blind flanges typically involves the following steps: Cutting the raw materials to size: The first step in the manufacturing process is to cut the raw materials to the required size and shape. This typically involves cutting sheets of metal, such as carbon steel or stainless steel, using a cutting machine. Forming the flange: Once the raw materials have been cut to size, the next step is to form the flange. This typically involves using a die-stamping machine to shape the metal into the desired flange shape. Heat treating the flange: Once the flange has been welded, it must be heat treated to improve its strength and durability. This typically involves heating the flange to a high temperature and then rapidly cooling it to harden the metal. Machining the flange: After the flange has been heat treated, it must be machined to achieve the desired level of precision and to create the necessary bolt holes and other features. This typically involves using a lathe or other machining equipment to shape the flange to the required specifications. Drilling holes in the flange for bolts to connect it to other components. Cleaning and preparing the surface of the flange for finishing. Applying a protective coating such as paint or galvanization to protect the flange from corrosion. Testing the flange to ensure it meets the required specifications and tolerances. Packaging the flange for shipping or storage. These steps may vary slightly depending on the specific type of flange being manufactured and the requirements of the application it will be used in.

Production process of casting blind flange

Casting blind flanges requires several steps. First, metal (usually iron or steel) is melted in a furnace and then poured into a mold. Moulds are usually made of sand and have the shape of the required flange, including the hole in the center. Once the metal cools and solidifies, the mold breaks and the flange is removed. They are then cleaned, inspected, and frequently machined to achieve the required dimensions and finish. Finally, the flange is ready for use.

Production process of cutting blind flange

The production process of cutting a blind flange typically involves the following steps: The raw materials, such as steel plates, are cut to size and shape using a cutting machine, such as a plasma cutter or laser cutter. The cut pieces are then machined to the desired dimensions and tolerances using a variety of machine tools, such as lathes, mills, and drills. The flange is then heat treated to improve its strength and durability. This can involve heating the flange to a high temperature and then quenching it in oil or water. The flange is then sandblasted to remove any surface imperfections and to improve its surface finish. Any holes or bolt holes are then drilled or punched into the flange using specialized machines. The flange is then inspected for quality and conformity to specifications. If necessary, the flange may be coated with a protective coating to prevent corrosion and improve its appearance. The flange is then packaged and shipped to the customer.

Marking of Blind Flanges

Blind flanges are usually marked with the letter “B” to indicate their type and the pressure rating of the flange, such as “150LB” for a 150-pound pressure rating. The pressure rating of the flange is important because it determines the maximum pressure that the flange can safely handle. In addition to the pressure rating, blind flanges may also be marked with the material of construction, such as carbon steel or stainless steel, as well as any applicable industry standards or codes. This information can be found on the flange itself, often along the outer edge or around the center hole. The marking may be embossed or stamped into the metal, or it may be in the form of a label or tag attached to the flange.

Packing of Blind Flanges

Blind flanges are usually packed in cartons or wooden boxes. In order to prevent damage during transportation, the box can also be protected inside, such as using foam filler or other similar materials. It is important to ensure that the stainless steel flange will not be damaged during transportation to ensure that it can work as expected.

Inspection and Measurement of Blind Flanges

In order to ensure that the blind flange works normally, it is very important to check and measure the blind flange regularly to ensure that it is in good condition and meets the necessary specifications. To inspect blind flanges, visually inspect for any signs of damage or defects, such as cracks, dents, or corrosion. The flanges should also be checked for correct alignment and any signs of leakage. To measure the blind flange, check several different dimensions. The first is the outer diameter of the flange, that is, the distance at the widest part of the flange. The second is the inner diameter of the flange, that is, the distance through the flange opening. The third is the thickness of the flange, that is, the distance from the outer surface of the flange to the inner surface. Other dimensions that can be measured include the bolt hole diameter of the flange and the distance between the bolt holes. When measuring blind flanges, be sure to use appropriate tools and techniques to ensure accurate results. This may include the use of a tape measure, caliper or micrometer, depending on the required accuracy. Special measuring equipment, such as bore gauges or flange alignment tools, may also be required to accurately measure flange dimensions. The inspection and measurement of blind flange is an important step to ensure its correct installation and safe operation in the pipeline or pressure vessel system.

Application of Blind Flanges

Blind Flanges are known to deliver exceptional performance and are generally developed for meeting the demands. We oer a broad range of Flat Faced Blind Flanges through a worldwide network of stockkeeping branches. These Blind Flange is use in various industries like:

  • Stainless Steel Blind Flanges uses in Oil and Gas Pipeline;
  • Blind Raised Face Flanges uses in Chemical Industry;
  • Alloy Steel BLRF Flanges uses in Plumbing;
  • Flat Faced Blind Flanges uses in Heating;
  • Blind Pipe Flanges uses in Water Supply Systems;
  • Blind Forged Flanges uses in Power Plant;
  • Blind Flanges uses in Paper & Pulp Industry;
  • Blind Flange uses in General Purpose Applications;
  • Steel Blind Flanges uses in Fabrication Industry;
  • Blind Flange uses in Food Processing Industry;
  • Blind Flanges uses in Structural Pipe.

Do I need a gasket for a blind flange?

Best practice is to use standard gaskets for these blind flanges. Blind flanges, like standard pipe flanges, can be either convex (RF) or flat (FF). If the flange is RF, we recommend using a standard ring gasket that is suitable for maintenance and/or testing.

How to purchase the correct blind flanges?

To purchase the right blind flange, you need to consider several factors. The following are the steps to follow. Determine the size and dimensions of the required blind flange. Measure the diameter of the pipe or equipment to which the blind flange will be connected and record the thickness of the blind flange. Select the material to be used for the blind flange. Common materials used for blind flanges include carbon steel, stainless steel and cast iron. Consider the pressure rating of the blind flange. The pressure rating will determine the maximum pressure that the blind flange can safely handle. Determine the type of connection required. Blind flanges can be bolted or welded to the pipe or equipment. Consider the intended use of the blind flange. If the blind flange will be used in a high temperature or corrosive environment, you may need to select a material that can withstand these conditions. With these factors in mind, you can then contact the supplier or manufacturer to purchase the correct blind flange for your needs. It may also be helpful to consult with an engineer or other professional to ensure that you have selected the right blind flange for your application.

How to select blind flanges manufacturer?

When selecting a blind flange manufacturer, there are several key factors to consider. Some of the most important factors to consider are the manufacturer’s experience and reputation, the quality of the product, and the ability to meet your specific needs and requirements. Here are a few steps you can follow to help you find a reputable blind flange manufacturer. Start by doing some research to identify some potential manufacturers who have experience in producing blind flanges. You can do this by seeking advice from other industry professionals, or by searching online for manufacturers who specialize in these products. Once you have a shortlist of potential manufacturers, contact each one to find out about their experience and capabilities. Ask about their past projects and the types of blind flanges they have produced in the past, and ask about their quality control processes to ensure their products meet industry standards. Request quotes from each manufacturer and compares prices, lead times, and other important factors to help you make an informed decision. Be sure to ask about any other services they offer, such as custom design and engineering support. It’s important to verify each manufacturer’s reputation before making a final decision. You can do this by reading online reviews, asking for testimonials from other customers, and checking to see if the manufacturer is registered with any industry associations or if they have received any certifications. Once you have gathered all the necessary information, carefully evaluate all factors to determine which manufacturer is best for your needs. Choose a manufacturer with a proven track record of producing high-quality products that can meet your specific requirements.

Export Country For Blind Plate Flanges

MIDDLE EAST AFRICA NORTH AMERICA EUROPE ASIA SOUTH AMERICA
Saudi Arabia Nigeria Usa Russia India Argentina
Iran Algeria Canada Norway Singapore Bolivia
Iraq Angola Mexico Germany Malaysia Brazil
Uae South Africa Panama France Indonesia Chile
Qatar Libya Costa Rica Italy Thailand Venezuela
Bahrain Egypt Puerto Rica Uk Vietnam Colombia
Oman Sudan Trinidad And Tobago Spain South Korea Ecuador
Kuwait Equatorial Guinea Jamaica Ukraine Japan Guyana
Turkey The Republic Of Congo Bahamas Netherland Sri Lanka Paraguay
Yemen Gabon Denmark Belgium Maldives Uruguay
Syria Greece Bangladesh
Jordan Czech Republic Mayanmar
Cyprus Portugal Taiwan
Hungary Cambodia
Albania
Austria
Switzerland
Slovakia
Finland
Ireland
Croatia
Slovenia
Malta

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