91 22 2385 6386
info@jfengg.com
Stainless Steel Buttweld Pipe Fittings Suppliers in India Inconel Flanges Manufacturers in India Nickel Alloys fasteners distributors India Inconel round Bar Traders in India Pipes and Tube Fittings Stockist in India
JF Engineering Products LLP

ANSI/ASMI B16.5 SPECTACLE BLIND FLANGE – ASTM A182 Inconel 600, 718

Stainless Steel ASTM A182 F316/316L/316H Spectacle Blind Flange, Monel ASTM A182 400/K500 Spectacle Blind Flange, Nickel 200/201 Spectacle Blind Flange, ANSI B16.5 ASTM A182 Inconel 600/601/625 Spectacle Blind Flange, Incoloy 800/800H/800HT Spectacle Blind Flange, Titanium Gr1/Gr2/Gr5/gr11 Spectacle Blind Flange, SS ASTM A403 WP-S/WP-W/WP-WX Spectacle Blind Flange, SS ASTM A403 309S/310S/317L Spectacle Blind Flange, Carbon Steel ASTM A234 WPB, WPBW Spectacle Blind Flange, Carbon Steel A234 WPHY 42/WPHY 46/WPHY 52 Spectacle Blind Flange, Duplex Steel ASTM A182 F44/F45/F51 Spectacle Blind Flange, Duplex Steel ASTM A182 F53/F55/F56 Spectacle Blind Flange, Alloy Steel F11/F22/F91 Spectacle Blind Flange

Spectacle Blinds are used in separating pipe systems for the connection. It is a steel plate divided into two discs of a certain thickness. Out of these two discs, one disc is of a solid plate and other is a ring whose inner diameter is equal to that of a flange. Spectacle Blinds is required in the systems that regularly need to be separated from other installations. Generally, it is mounted in the “Open” position so that flow through the pipe is possible. If it is placed in the “close” position and if it is rotated, then, the pipe is blanked off and no flow is feasible. The whole idea of a spectacle blind is to ensure that an item of equipment is properly and securely blanked off with no leakage or no flow through a valve during maintenance.

The whole idea of a spectacle blind is so that one can be absolutely sure that an item of equipment is properly and securely blanked off with no possibility of any flow or leakage through a valve during maintenance. The flow can be diverted to other items of equipment but not just bypassed around the blank as this would compromise the safety function of the spectacle blind. The flow has to valved off and pressure relieved prior to loosening flange bolts and swinging the blind.

Specification - ASME B16.5 Spectacle Blind Flange
Size: 1/2"NB TO 24"NB IN
Class: 150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS DIN Standard ND-6,10, 16, 25, 40 Etc.
Materials: Monel :
Grade: Monel 400, Monel K500, Monel R-405
Nickel :
Grade: Nickel 200, Nickel 201
Inconel :
Grade: Inconel 600, Inconel 601, Inconel 625, Inconel 718
Incoloy :
Grade: Incoloy 800, Inconel 800H, 800HT
Hastalloy :
Grade: Hastalloy B2, Hastalloy B3, Hastalloy C22, Hastalloy C276, Hastalloy X
Titanium :
Grade: Gr1, Gr2, Gr3, Gr5, Gr7, Gr11
Stainless Steel :
Grade: ASTM A182 F202, F304/304L/304H, F316/316L, F316H, F316TI, F310, F321, F904L
Carbon Steel :
Grade: ASTM A105/A105N, A350 LF1, LF2 CL1/CL2, LF3 CL1/CL2, A694 F42, F46, F48, F50, F52, F56, F60, F65, F70, A516.60, 65, 70 (Spectacle Blind Flange, Spacer Ring/Spade Flange), Steel RST37.2, C22.8
Duplex Steel:
Grade: ASTM / ASME A/SA 182 UNS F44, F45, F51, F53, F55, F60, F61
Alloy Steel:
Grade : ASTM A182 F1, F5, F9, F11, F22, F91
Value Added Service: CNC Machine, Customized Flanges
Coating/Surface Treatment: Anti-rust Paint, Oil Black Paint, Yellow Transparent, Zinc Plated, Cold and Hot Dip Galvanized

Dimensions Spectacle Blind Flange

Pressure Class 150

NPS Outside Ø
A
Inside Ø
B
Center Line
C
THK
t
Web Width
W
1/2 45 16 60 3 38
3/4 54 21 70 3 38
1 64 27 80 3 38
73 42 90 6.4 38
83 48 100 6.4 38
2 102 61 120 6.4 51
107 73 140 6.4 51
3 133 89 150 6.4 64
159 102 175 9.7 64
4 172 114 190 9.7 64
5 194 141 215 9.7 76
6 219 168 240 12.7 76
8 276 219 300 12.7 76
10 337 273 360 15.7 102
12 406 324 430 19.1 102
14 448 356 475 19.1 108
16 511 406 460 22.4 108
18 546 457 580 25.4 114
20 603 508 635 28.4 121
24 714 610 750 31.8 140

Pressure Class 300

NPS Outside Ø
A
Inside Ø
B
Center Line
C
THK
t
Web Width
W
1/2 51 16 65 6.4 38
3/4 64 21 80 6.4 38
1 70 27 90 6.4 38
79 42 100 6.4 38
92 48 115 6.4 38
2 108 61 125 9.7 51
127 73 150 9.7 51
3 146 89 170 9.7 64
162 102 185 12.7 64
4 178 114 200 12.7 64
5 213 141 235 15.7 76
6 248 168 270 15.7 76
8 305 219 330 22.4 76
10 359 273 385 25.4 102
12 419 324 450 28.4 102
14 483 356 515 31.8 108
16 536 406 570 38.1 108
18 594 457 630 41.1 114
20 651 508 685 44.5 121
24 772 610 810 50.8 140

Pressure Class 600

NPS Outside Ø
A
Inside Ø
B
Center Line
C
THK
t
Web Width
W
1/2 51 16 65 6.4 38
3/4 64 21 80 6.4 38
1 70 27 90 6.4 57
79 37 100 9.7 57
92 43 115 9.7 67
2 108 55 125 9.7 57
127 67 150 12.7 67
3 146 83 170 12.7 67
159 96 185 15.7 76
4 191 108 215 15.7 76
5 238 135 265 19.1 86
6 264 162 290 22.4 86
8 318 212 350 28.4 95
10 397 265 430 35.1 105
12 454 315 490 41.1 105
14 489 346 525 44.5 114
16 562 397 605 50.8 124
18 610 448 655 53.8 133
20 679 497 725 63.5 133
24 787 597 840 73.2 152
NPS Outside Ø
A
Inside Ø
B
Center Line
C
THK
t
Web Width
W

Pressure Class 900

NPS Outside Ø
A
Inside Ø
B
Center Line
C
THK
t
Web Width
W
1/2 60 16 80 6.4 38
3/4 67 21 90 6.4 41
1 76 27 100 6.4 57
86 37 110 9.7 57
95 43 125 9.7 67
2 140 55 165 12.7 57
162 67 190 12.7 67
3 165 83 190 15.7 67
4 203 108 235 19.1 76
5 244 135 280 22.4 86
6 286 162 320 25.4 86
8 356 212 395 35.1 95
10 432 265 470 41.1 105
12 495 315 535 47.8 105
14 518 346 560 53.8 114
16 572 397 615 60.5 124
18 635 448 685 66.5 133
20 696 497 750 73.2 133
24 835 597 900 88.9 152
NPS Outside Ø
A
Inside Ø
B
Center Line
C
THK
t
Web Width
W

Pressure Class 1500

NPS Outside Ø
A
Inside Ø
B
Center Line
C
THK
t
Web Width
W
1/2 61 16 80 6.4 38
3/4 67 21 90 9.7 41
1 76 27 100 9.7 64
86 35 110 9.7 64
95 41 125 12.7 70
2 140 53 165 12.7 70
162 63 190 15.7 76
3 172 78 205 19.1 76
4 206 102 240 22.4 89
5 251 128 290 28.4 89
6 279 154 320 35.1 89
8 349 203 395 41.1 102
10 432 255 480 50.8 114
12 518 303 570 60.5 114
14 575 333 635 66.5 127
16 638 381 705 76.2 133
18 702 429 775 85.9 146
20 752 478 830 95.3 152
24 899 575 990 111.3 178
NPS Outside Ø
A
Inside Ø
B
Center Line
C
THK
t
Web Width
W

Pressure Class 1500

NPS Outside Ø
A
Inside Ø
B
Center Line
C
THK
t
Web Width
W
1/2 61 16 80 6.4 38
3/4 67 21 90 9.7 41
1 76 27 100 9.7 64
86 35 110 9.7 64
95 41 125 12.7 70
2 140 53 165 12.7 70
162 63 190 15.7 76
3 172 78 205 19.1 76
4 206 102 240 22.4 89
5 251 128 290 28.4 89
6 279 154 320 35.1 89
8 349 203 395 41.1 102
10 432 255 480 50.8 114
12 518 303 570 60.5 114
14 575 333 635 66.5 127
16 638 381 705 76.2 133
18 702 429 775 85.9 146
20 752 478 830 95.3 152
24 899 575 990 111.3 178
NPS Outside Ø
A
Inside Ø
B
Center Line
C
THK
t
Web Width
W

Pressure Class 2500

NPS Outside Ø
A
Inside Ø
B
Center Line
C
THK
t
Web Width
W
1/2 67 16 90 9.7 38
3/4 73 21 95 9.7 41
1 83 27 110 9.7 64
102 35 130 12.7 64
114 41 145 15.7 70
2 143 53 170 15.7 70
165 63 195 19.1 76
3 194 78 230 22.4 76
4 232 102 275 28.4 89
5 276 128 325 35.1 89
6 314 154 370 41.1 89
8 384 198 440 53.8 102
10 473 248 540 66.5 114
12 546 289 620 79.2 114
NPS Outside Ø
A
Inside Ø
B
Center Line
C
THK
t
Web Width
W

Notes:

  • Dimensions are in millimeters unless otherwise indicated.
  • D = Hole size (where required) should be the same as the flange bolt hole. In practice, these dimensions have been rounded round off upwards.
  • D = Hole size (where required) should be the same as the flange bolt hole. In practice, these dimensions have been rounded round off upwards.
  • Wt = Thickness of the web (or tie bar) should be 6 mm minimum, or equal to Thickness (t) if less than 6 mm.
  • Spectacle Blinds should be made from a plate or forging specification, approved for use by ASME B31.3, of essentially the same chemical composition as the mating flanges and piping involved.
  • Spectacle Blinds according to ASME B16.48 may be used for installation between ASME B16.5 flanges
  • Depending on a customer specification, some dimensions can be different from what on this page is defined.

Marking and Packing

Products are packaged to ensure that there is no damage during transit. In case of exports, standard export packaging is done in wooden cases. All flanges are marked with Grade, Lot No, Size, Degree and our trade mark. On special requests we can also, make custom marking on our products.

Quality Assurance

At JF Engineering Products LLP, all fittings and flanges are subject to strict inspection at each stage of the production process, from starting material purchasing to product dispatch. They are visually examined for conformity to ASTM, ASME, MSS, DIN, EN, and JIS codes and standards. Upon request, official certified Inspection Agencies can be called in to witness the material reports, dimensions and quality conformity of products.

Test Certificates

Manufacturer Test Certificate as per EN 10204 / 3.1B, Raw Materials Certificate, 100% Radiography Test Report, Third Party Inspection Report

Shipping Policy

Delivery time and delivery dates are based on the "type and quantity" of steel ordered. Our sales team will provide a delivery schedule when quoting to you. On rare occasions the delivery schedule may change so please check with our sales department when placing any orders.

Orders will be sent out within 2-3 business days, and may take up to 5-10 business days in transit. If Flange is out of stock, orders may take up to 2-4 weeks to ship. JF Engineering Products LLP will notify buyer if this situation occurs..

Uses & Application

JF Engineering Products LLP take immensure pleasure in introducing itself as one of the leading Manufacturer & Exporter of high quality ASME B16.5 Spectacle Blind Flange to meet the customer ultimate requirements in the fields of:

Chemical Oil Mills Petrochemical Mining Refineries Construction
Fertilizers Shipbuilding Power Plant Steel Plant Nuclear Power Offshore
Oil & Gas Defence Paper Ports Breweries Railway
Cement Engineering Co. Sugar & Government Org. etc.

Contact Us
Send Enquiry

Our Products