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Blind flanges are characterized by no holes. This is why blind flanges can be used in the whole piping system to block or seal the ends of the openings of pipes, valves and pressure vessels. ASME B16.5 blind flanges are usually made of forged, cast or plate.
From the perspective of internal pressure and bolt load, 4-inch sliding sleeve blind flange, especially the flange with larger size, is often the flange type with the largest stress.
ASME B16.5 Blind Flange ANSI B16.5 Stainless Steel Blind Flange ASTM A105 Carbon Steel Flange BLRF
Check the weight and size of 150 # blind flange and convex blind flange, and the specification of 6-inch blind pipe flange.
What is ASME B16.5 blind flange?
However, most of these stresses or loads are bending types near the center. Since there is no standard inner diameter, ANSI B16.5 threaded blind flange is very suitable for higher pressure and temperature applications. In addition to several aspects covered by this standard, such as pressure and temperature ratings, materials, carbon steel blrf flange dimensions, tolerances, marking, testing and methods of specifying openings; ASME B16.5 also considers requirements and recommendations for flange gaskets, flange bolting, and flange joints. The pressure ratio of convex blind flange is specified according to the following grades, namely 150, 300, 400, 600, 900, 1500 and 2500. However, the sizes of stainless steel blind flanges are NPs 1/2 to NPs 24, and the requirements of these flanges are expressed in metric and American units.
ASME B16.5 blind flange size (mm)
What is ASME B16.5 blind flange?
However, most of these stresses or loads are bending types near the center. Since there is no standard inner diameter, ANSI B16.5 threaded blind flange is very suitable for higher pressure and temperature applications. In addition to several aspects covered by this standard, such as pressure and temperature ratings, materials, carbon steel blrf flange dimensions, tolerances, marking, testing and methods of specifying openings; ASME B16.5 also considers requirements and recommendations for flange gaskets, flange bolting, and flange joints. The pressure ratio of convex blind flange is specified according to the following grades, namely 150, 300, 400, 600, 900, 1500 and 2500. However, the sizes of stainless steel blind flanges are NPs 1/2 to NPs 24, and the requirements of these flanges are expressed in metric and American units.
ASME B16.5 blind flange size (mm)
Class 150 Blind Flange Dimensions
| NPS | “A” (Outer Diameter) |
“B” (Thickness) |
“C” (RF Diameter.) |
“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 |
Carbon Steel Flange BLRF Specification
| Specification : | ASME B16.5 Blind Flange |
| Machining Equipment: | Bending machine, Pushing Machine, Sand-blasting machine, Press machine, electric bevelling machine etc |
| Production Process: | Forged, Heat Treated and Machined |
| Design For Size: | ASA, ASME, DIN, PN, JIS, ANSI, BS, EN |
| ASME B16.5 Application: | Oil And Gas Industry Chemical Industry Natural Gas Industry Water Pipeline Industry Fabrication Industry Nuclear Power Plant |
| Connect Type Type: | RF, FF, RTJ, LMF, SMF, LJF. |
| Pressure Rating Table: | Class 150 LBS, Class 300 LBS, Class 600 LBS, Class 900 LBS, Class 1500 LBS, Class 2500 LBS |
| Coating Faces : | Yellow Transparent, Oil Black Paint, Anti-rust Paint, Cold and Hot Dip Galvanized, Zinc Plated |
| ASA Flange Size Chart : | 1/2″ (15 NB) To 48″ (1200NB) |
| Standards : | ASME B16.5, ASME B16.47 (Series A, Series B), ASME B16.38, EN-1092, BS10, DIN, PN, JIS, ISO, GOST, UNI, AWWA, MSS SP44. |
Pressure Ratings Of Threaded Blind Flange
| Pressure Ratings Of ASME B16.5 Blind Flange With Weight and Size | ||||||||||||||||||
| NPS | 150 LBS | 300 LBS | 600 LBS | 900 LBS | 1500 LBS | 2500 LBS | ||||||||||||
| 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 | 1500 # WEIGHTS | 5 | 4 | 4 | 7 | 7 | 7 | ||
| 3/4″ | 2 | 2 | 2 | 3 | 3 | 3 | 4 | 3 | 3 | 1500 # WEIGHTS | 6 | 5 | 6 | 8 | 8 | 8 | ||
| 1″ | 3 | 2 | 2 | 4 | 3 | 3 | 4 | 4 | 4 | 1500 # WEIGHTS | 9 | 8 | 8 | 12 | 11 | 11 | ||
| 1 1/2″ | 4 | 3 | 3 | 7 | 6 | 6 | 8 | 7 | 8 | 1500 # WEIGHTS | 13 | 12 | 13 | 25 | 22 | 23 | ||
| 2″ | 6 | 5 | 5 | 9 | 7 | 8 | 12 | 9 | 10 | 1500 # WEIGHTS | 25 | 25 | 25 | 42 | 37 | 39 | ||
| 2 1/2″ | 8 | 7 | 7 | 12 | 10 | 12 | 18 | 13 | 15 | 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 in. = 25.44 millimeter | • 1 millimeter = 0.03937 in. | • 1 lb/ft^2 = 47.88 Pa | • 1 psi = 6.8948 Pa | • x°F = (5/9)(x-32)°C |
| • 1 pound = 0.45359 Kilogram | • 1 Kilogram = 2.20462 pounds | • 1 Pa = 0.020885 lb/ft^2 | • 1 Pa = 0.00014504 psi | • x°C = (9/5)x + 32°F |
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Stainless Steel Blind Flange Types
150# BLRF 2 304 Blind Pipe Flange BS4504 304 Stainless Steel Raised Face Blind Flange ANSI B16.5 Rating Class 150 Rf Blind Flange BS4504 ISO 9001 Standard Threaded Blind Flange
ASTM 8′ 600LB SCH40S Ductile Iron Blind Flange Forged Carbon Steel 6 Inch Blind Flange ANSI B16.5 300LBS A105 Flat Face Blind Flange 2 inch 900# Table E Blind Flange
2 Inch To 24 Inch Aluminum Blind Flange 1/2 in. 300# A105 Grooved Blrf Flange High Pressure ASTM A105 Din 50 High Hub Blind Flange Low Temp 1 1/2 Rf 600# Copper Blind Flange
EN 1092 300# Blind Flange Dimensions
| NPS | “A” (Outer Diameter) |
“B” (Thickness) |
“C” (RF Diameter.) |
“D” (B.C.D.) |
# Bolt Holes |
Diameter 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 |
DN15-1200 Class 600 Blind Flange Dimensions
| ASME/ ANSI / ASA B16.5 Class 600 Blind Flange-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 |
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Rtj Blind Flange Dimensions 1500
| Pipe Normal Diameter. | Outer Diameter Flange | Thickness Of Flange Min | Diameter of Hub | Diameter of Bolt Circle | Diameter of Bolt Holes | Number of Bolts | Diameter of Bolts(in.) | Approx. Weight | ||
|---|---|---|---|---|---|---|---|---|---|---|
| in. | 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 | ||
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MSS SP-44 2500LBS Blind Flanges Dimensions
| Pipe Normal Diameter | Outer Diameter Flange | Thk. Of Flange Min | Diameter of Bolt Circle | Diameterof Bolt Holes | Num. of Bolts | Diameter of Bolts(inch) | Kilogram | LB | |
|---|---|---|---|---|---|---|---|---|---|
| in. | 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 | 14 |
