ANSI/ASME B16.5 Blind Flange | BLRF Flange

blind-flange-manufacturer

Table of Content

Kaizen Steel Industries is a leading exporter of ANSI B16.5 SS Blind Flanges in Mumbai, India, and are also suppliers of CS BLRF Flanges. We offer a range of products including EN 1092-2 PN16 Blind Flanges and MSS SP-44 Class 150 Blind Flanges. We also provide a price list for reducing blind flanges.

Blind flanges are designed without a bore and are used to seal the ends of pipes, valves, and pressure vessel openings. Due to their design, blind flanges, especially those in larger ANSI sizes, are among the most stressed flange types in terms of internal pressure and bolt loading. Most of the stress is bending stress near the center of the flange. The PN16 blind flange dimensions are suitable for high-pressure and high-temperature applications because there is no standard inside diameter.

The B16.5 standard applies to flanges and flanged fittings made from cast or forged materials, including blind flanges and certain reducing flanges made from cast, forged, or plate materials. This standard also covers requirements and recommendations for flange bolting, gaskets, and joints.

ASME B16.5 Blind Flanges are available in a range of sizes. You can view the blind flange size chart here. These flanges typically come in sizes from NPS 1/2 to NPS 24, in both Metric and Inch measurements. The ASME B16.5 standard covers various aspects such as pressure and temperature ratings, materials, dimensions, weight charts, tolerances, testing, marking, and methods for designating openings for pipe flanges and flanged fittings.

The standard includes:

  1. Blind Flange Dimensions: Available in rating classes 150, 300, 400, 600, 900, and 1500 for sizes NPS 1/2 through NPS 24, and class 2500 for sizes NPS 1/2 through NPS 12. It covers both metric and U.S. Customary units, including bolt diameters and flange bolt holes expressed in inch units.
  2. Raised Face Fittings: Includes rating classes 150 and 300 for sizes NPS 1/2 through NPS 24. Requirements are specified in both metric and U.S. Customary units, with bolt diameters and flange bolt holes expressed in inch units.
  3. Flanged Fittings: Available in pressure rating classes 400, 600, 900, and 1500 for sizes NPS 1/2 through NPS 24, and class 2500 for sizes NPS 1/2 through NPS 12, as detailed in Non-Mandatory Appendix E, which provides only U.S. Customary units.

The ASME B16.5 Blind Flange standard should be used alongside equipment specified in other ASME B16 Series standards and other ASME codes, such as the Boiler and Pressure Vessel Code and the B31 Piping Codes.

We are one of the largest manufacturers of blind flanges in India and also supply, distribute, and export class 300 blind flanges.

Blind Flange Specification

ASME B16.5 Blind Flange Size Chart1/2″ (15 NB) to 48″ (1200NB) DN10~DN5000
BLRF Flange StandardsANSI/ASME B16.5, B16.47 Series A & B, B16.48, BS4504, BS 10, EN-1092, DIN, ANSI Blind Flange, ASME Blind Flange, BS Blind Flange, DIN Blind Flange, EN Blind Flange, GOST Flange, ASME/ANSI B16.5/16.36/16.47A/16.47B, MSS S44, ISO70051, JISB2220, BS1560-3.1, API7S-15, API7S-43, API605, EN1092
Blind Flange Pressure Rating ANSIClass 150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS Blind Flange
Blind Flange Pressure Calculation in DIN6Bar 10Bar 16Bar 25Bar 40Bar / PN6 PN10 PN16 PN25 PN40, PN64 Blind Flange
JIS blind flange raised face5K, 10 K, 16 K 20 K, 30 K, 40 K, 63 K Blind Flange
UNI blind flange material6Bar 10Bar 16Bar 25Bar 40Bar Blind Flange
EN slip blind flange6Bar 10Bar 16Bar 25Bar 40Bar Blind Flange
Coating paddle blind flangeOil Black Paint, Anti-rust Paint, Zinc Plated, Yellow Transparent, Cold and Hot Dip Galvanized Blind Flange
Most common types of Blind FlangeForged / Threaded / Screwed / Plate
Test CertificatesEN 10204/3.1B
Raw Materials Certificate
100% Radiography Test Report
Third Party Inspection Report, etc
Production technique
  • Forged, Heat treated and machined
Connect Type/ Flange Face TypeRaised Face (RF), Ring Type Joint (RTJ), Flat Face (FF), Large Male-Female (LMF), Lap-Joint Face (LJF), Small Male-Female (SMF), Small Tongue, Large Tongue & Groove, Groove
Special design

As per your drawing

AS, ANSI, BS, DIN and JIS
15 NB (1/2″) to 200 NB (8″)
Equal and Reducing Configurations

Test EN 1092 blind flangeDirect-reading Spectrograph, Hydrostatic testing machine, X-ray detector, UI trasonic flaw detector, Magnetic particle detector
EquipmentPress machine, Bending machine, Pushing Machine, electric bevelling machine, Sand-blasting machine etc
OriginIndian / West Europe / Japan / USA / Korean
blind flange manufacturers in india

ANSI DIN, GOST, JIS, UNI, BS, AS2129, AWWA, EN, SABS, NFE etc.
Blind Flange: -BS Flange, EN Flange, API 6A Flange, ANSI Flange, ASME Flange, DIN Flange, EN1092-1 Flange, UNI Flange, JIS/ KS Flange, BS4504 Flange, GB Flange, AWWA C207 Flange, GOST Flange, PSI Flange

  • B.S: BS4504 , BS3293, BS1560, BS10
  • AS 2129: Table D; Table E; Table H
  • ANSI B16.5, ANSI B16.47 Series A & B, MSS SP44, ASA, API-605, AWWA, Custom Drawings
  • ANSI : ANSI B16.5, ANSI B16.47(API605), MSS SP44, ANSI B16.36, ANSI B16.48
  • ANSI B16.5, ANSI B16.47, MSS SP44, ANSI B16.36, ANSI B16.48
  • American standard (ANSI)
  • German (DIN)
  • stainless steel blind flange British standard (BS)
  • 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 Blind Flange
  • The other standard: AWWA C207; EN1092-1, GOST12820, JIS B2220; KS B1503, SABS1123; NFE29203; UNI2276
din blind flange Uses & application
  • Bitumen upgraders.
  • Heavy oil refineries.
  • Nuclear power (mostly seamless).
  • Petrochemicals and acids.
Export to ASME B16.5 Blind FlangesIreland, Singapore, Indonesia, Ukraine, Saudi Arabia, Spain, Canada, USA, Brazil, Thailand, Korea, Iran, India, Egypt, Oman, Dubai, Peru, etc
Material Test Certificates (MTC) as per EN 10204 3.1 and EN 10204 3.2, Test Certificates certifying NACE MR0103, NACE MR0175

Blind Flanges Material & Grades

Material Type Specifications
Stainless Steel Blind Flanges ASTM A182, A240 F 304, 304L, 304H, 316, 316L, 316Ti, 310, 310S, 321, 321H, 317, 347, 347H, 904L
Carbon Steel Blind Flanges ASTM / ASME A/SA 105, ASTM / ASME A 350, ASTM A 181 LF 2, A516 Gr.70, A36, A694 F42, F46, F52, F60, F65, F70
Alloy Steel Blind Flanges ASTM / ASME A/SA 182 & A 387 F1, F5, F9, F11, F12, F22, F91
Duplex Steel Blind Flanges ASTM / ASME A/SA 182 F 44, F 45, F51, F 53, F 55, F 60, F 61
Super Duplex Blind Flanges ASTM / ASME A/SA 182, A240 F 44, F 45, F51, F 53, F 55, F 60, F 61
Nickel Alloy Blind Flanges Nickel 200 (UNS No. N02200), Nickel 201 (UNS No. N02201), Monel 400 (UNS No. N04400), Monel 500 (UNS No. N05500), Inconel 800 (UNS No. N08800), Inconel 825 (UNS No. N08825), Inconel 600 (UNS No. N06600), Inconel 625 (UNS No. N06625), Inconel 601 (UNS No. N06601), Hastelloy C 276 (UNS No. N10276), Alloy 20 (UNS No. N08020), Titanium (Grade I & II)
Copper Alloy Blind Flanges UNS No. C10100, 10200, 10300, 10800, 12000, 12200, 70600, 71500, UNS No. C 70600 (Cu-Ni-90/10), C 71500 (Cu-Ni-70/30)
Low Temperature Carbon Steel Blind Flanges ASTM A350, LF2, LF3

ASME B16.5 Blind Flanges Type

asme-b16-5-blind-flange-manufacturers

ASME B16.5 Blind Flange

asme-b16-5-blind-flange-manufacturers2

ASME B16.5 BLRF Flange

ANSI B16.5 Flat Face Blind Flange

asme-b16-5-blind-flange-manufacturers4

B16.47 Series A Blind Flange Dimensions

ASME B16.5 Blind Flange Dimensions

Material Type Specifications
Stainless Steel Blind Flanges ASTM A182, A240 F 304, 304L, 304H, 316, 316L, 316Ti, 310, 310S, 321, 321H, 317, 347, 347H, 904L
Carbon Steel Blind Flanges ASTM / ASME A/SA 105, ASTM / ASME A 350, ASTM A 181 LF 2, A516 Gr.70, A36, A694 F42, F46, F52, F60, F65, F70
Alloy Steel Blind Flanges ASTM / ASME A/SA 182 & A 387 F1, F5, F9, F11, F12, F22, F91
Duplex Steel Blind Flanges ASTM / ASME A/SA 182 F 44, F 45, F51, F 53, F 55, F 60, F 61
Super Duplex Blind Flanges ASTM / ASME A/SA 182, A240 F 44, F 45, F51, F 53, F 55, F 60, F 61
Nickel Alloy Blind Flanges Nickel 200 (UNS No. N02200), Nickel 201 (UNS No. N02201), Monel 400 (UNS No. N04400), Monel 500 (UNS No. N05500), Inconel 800 (UNS No. N08800), Inconel 825 (UNS No. N08825), Inconel 600 (UNS No. N06600), Inconel 625 (UNS No. N06625), Inconel 601 (UNS No. N06601), Hastelloy C 276 (UNS No. N10276), Alloy 20 (UNS No. N08020), Titanium (Grade I & II)
Copper Alloy Blind Flanges UNS No. C10100, 10200, 10300, 10800, 12000, 12200, 70600, 71500, UNS No. C 70600 (Cu-Ni-90/10), C 71500 (Cu-Ni-70/30)
Low Temperature Carbon Steel Blind Flanges ASTM A350, LF2, LF3

JIS Blind Flange Dimensions

JIS 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 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

JIS 16K Blind Flange Dimensions

PipePipeBoDtTGfrHXCHolesBolt Dia.
inchmm
3/81017.317.8+0.5
-0
90+1.0
-0
12+1.0
-0
 ±1.048±0.81  +1.5
-0
 +1.5
-0
65±0.5415
1/21521.722.29512 521   70415
3/42027.227.710014 581   75415
12534.034.512514 701   90419
1-1/43242.743.213516 802   100419
1-1/24048.649.114016 852   105419
25060.561.115516 1002   120419
2-1/26576.377.117518 1202   140419
38089.190.018518 1302   150819
3-1/290101.6102.6+1.0
-0
19518 1402   160819
4100114.3115.421018 1552   175819
5125139.8141.2 250 20   185 2     210 823
6150165.2166.628022+1.5
-0
 2152   240823
7175190.7192.1305+1.5
-0
2232240±0.926208212265±0.61223
8200216.3218.03302232265262342382901223
9225241.8243.73502234285262602643101223
10250267.4269.54002436325262882923551225
12300318.5321.04452438370363403464001625
14350355.6358.14902642415363803864451625
16400406.4409.0+1.5
-0
560 28 44 475 36436 442 510 1627
18450457.2460.0620+2.0
-0
304853036496+2.0
-0
502+2.0
-0
565±0.82027
20500508.0511.06753048585365485546202027
22550558.8562.07453252±1.5640366046106802033
24600609.6613.0+2.0
-0
7953252690±1.036656+2.5
-0
662+2.5
-0
7302433
26650660.4664.08453456740367067127802433
28700711.2715.09053458800367627708402433
30750762.0766.09703662855368168249002433
32800812.8817.0+2.5
-0
1020+2.5
-0
366490536868+3.0
-0
876+3.0
-0
9502833
34850863.6868.010703666955369209281000±1.02833
36900914.4919.0112038701005±1.23697197910502833
4010001016.01021.0+3.0
-0
1235 40 74 1110 361073+3.5
-0
1081+3.5
-0
1160 2839
4411001117.61123.0134542781220381175118512702839
4812001219.21224.014654482132538127812901380±1.53239
5413501371.61377.01630+3.0
-0
48881480381432145015403645
6015001524.01529.0179550901635381585160017004045

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

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

Applications and Uses of Blind Flanges

  • Spectacle Blinds: Commonly used for transporting materials.
  • Stainless Steel Spectacle Blinds: Used in the automotive industry.
  • Spectacle Blinds: Applied in homes and buildings.
  • SS Spectacle Blinds: Utilized in sewerage systems and industrial water lines.
  • Carbon Steel Spectacle Blinds: Employed in heating and air-conditioning systems.
  • Spectacle Blinds: Used in plumbing applications.
  • Alloy Spectacle Blinds: Used in the food processing industry.
  • Spectacle Blinds: Applied in the paper and pulp industry.
  • Spectacle Blinds: Utilized in the food industry.

Kaizen Steel Industries Export to

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