How to get high quality spacer rings and spade flanges?
What are Ring spacers?
Ring spacers are devices which are inserted between the flanges, when spades are removed (they can be considered as placeholders of blanks). Ring spacer handlers shall have a single through indicator hole located at the end of the handler. The hole diameter shall not be lower than 12 mm.
So as for the Spectacle Blind already described, maintenance on a pipesystem can be a reason to temporarily replace a Ring Spacer for a Spade. By loosening of all bolts, and half of the bolts temporarily remove, the Spade or Spacer can be placed. After replacing the gaskets (new gaskets are to recommend), the bolts can be re-assembled and tightened.
A small problem is that we basically can not see, or a Spade or a Spacer mounted between the flanges. Therefore the handles are often specially marked, or both have a different design; a customer often provides its own specification.
What should never lack is, that in the handle, the diameter and the Pressure Class of a Spade or Spacer is engraved; this applies also for the Spectacle Blind.
What are Spade Flanges?
Spade flanges are positive shut off steel rings used to blind a pipeline. They are also called “single blind” (to differentiate from spectable blinds, which are a combination of two discs, as seen above) or “blanks”.
Spades and Spacers be applied in systems where maintenance is often not necessary, or in applications with large pipe sizes. Depending on the flange size and the Pressure Class, Spades can weigh hundreds of pounds. To prevent unnecessary weight to a flange connections, usually will be chosen not for a Spectacle Blind, but for 2 separate parts.
Surfaces – Dimensions – Material
The sealing surfaces of a Spectacle Blind, Spade or Ring Spacer are usually conducted in accordance with the Face Finish from the flange. The diameter always is slightly larger than the Raised Face of a flange; by a correct assembly, the bolts are just not touched by the Blind or Spacer.
The diameter of them, is depending on the flange size, and the thickness from the Pressure Class of a flange.
Dimensions from Spectacle Blinds, Spades and Ring Spacers, you will find in the main Menu “Flanges”
ASME B16.48 covers pressure-temperature ratings, materials, dimensions, dimensional tolerances, marking, and testing for operating line blanks in sizes NPS 1/2 – NPS 24 for installation between ASME B16.5 flanges in the 150, 300, 600, 900, 1500, and 2500 Pressure Classes.
Spectacle Blinds, Spades and Ring Spacers 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.
If a piece of equipment needs to be inspected or removed from service then the plate covers the ring to form an airtight seal which consequently isolates a section of line or the piece of equipment. It provides a permanent or long term isolation device.
Specifications:
Our spectacle flanges are designed to ensure that an item of equipment can be securely blanked off, with no possibility of leakage in the valve.
Because safety is so important to the function, we assure that they are tested rigorously to client’s specifications.
Our spectacle blinds, spades and spacers come in pressure ratings of 150lbs, 300lbs, 600lbs, 900lbs, 1500lbs and 2500lbs
Spectacle blinds, spades and spacers are available dimensionally in accordance with API 590 and ASTM 16.48 or any of our customer requirements.
Pressure Class 150
NPS |
Outside Dia A |
Inside Dia B |
Center to End C |
Thick ness t |
Handle Width W |
1/2 | 45 | 16 | 126 | 3 | 32 |
3/4 | 54 | 21 | 131 | 3 | 32 |
1 | 64 | 27 | 136 | 3 | 32 |
1¼ | 73 | 42 | 145 | 6.4 | 32 |
1½ | 83 | 48 | 145 | 6.4 | 32 |
2 | 102 | 61 | 155 | 6.4 | 32 |
2½ | 107 | 73 | 170 | 6.4 | 32 |
3 | 133 | 89 | 170 | 6.4 | 32 |
3½ | 159 | 102 | 202 | 9.7 | 38 |
4 | 172 | 114 | 202 | 9.7 | 38 |
5 | 194 | 141 | 225 | 9.7 | 38 |
6 | 219 | 168 | 225 | 12.7 | 38 |
8 | 276 | 219 | 267 | 12.7 | 38 |
10 | 337 | 273 | 322 | 15.7 | 44 |
12 | 406 | 324 | 357 | 19.1 | 44 |
14 | 448 | 356 | 378 | 19.1 | 44 |
16 | 511 | 406 | 410 | 22.4 | 44 |
18 | 546 | 457 | 427 | 25.4 | 51 |
20 | 603 | 508 | 455 | 28.4 | 51 |
24 | 714 | 610 | 512 | 31.8 | 51 |
NPS |
Outside Dia A |
Inside Dia B |
Center to End C |
Thick ness t |
Handle Width W |
Pressure Class 300
NPS |
Outside Dia A |
Inside Dia B |
Center to End C |
Thick ness t |
Handle Width W |
1/2 | 51 | 16 | 129 | 6.4 | 32 |
3/4 | 64 | 21 | 136 | 6.4 | 32 |
1 | 70 | 27 | 139 | 6.4 | 32 |
1¼ | 79 | 42 | 150 | 6.4 | 32 |
1½ | 92 | 48 | 150 | 6.4 | 32 |
2 | 108 | 61 | 158 | 9.7 | 32 |
2½ | 127 | 73 | 177 | 9.7 | 32 |
3 | 146 | 89 | 177 | 9.7 | 32 |
3½ | 162 | 102 | 205 | 12.7 | 38 |
4 | 178 | 114 | 205 | 12.7 | 38 |
5 | 213 | 141 | 240 | 15.7 | 38 |
6 | 248 | 168 | 240 | 15.7 | 38 |
8 | 305 | 219 | 281 | 22.4 | 38 |
10 | 359 | 273 | 333 | 25.4 | 44 |
12 | 419 | 324 | 363 | 28.4 | 44 |
14 | 483 | 356 | 395 | 31.8 | 44 |
16 | 536 | 406 | 422 | 38.1 | 44 |
18 | 594 | 457 | 450 | 41.1 | 51 |
20 | 651 | 508 | 480 | 44.5 | 51 |
24 | 772 | 610 | 540 | 50.8 | 51 |
NPS |
Outside Dia A |
Inside Dia B |
Center to End C |
Thick ness t |
Handle Width W |
Pressure Class 600
NPS |
Outside Dia A |
Inside Dia B |
Center to End C |
Thick ness t |
Handle Width W |
1/2 | 51 | 16 | 129 | 6.4 | 32 |
3/4 | 64 | 21 | 136 | 6.4 | 32 |
1 | 70 | 27 | 139 | 6.4 | 32 |
1¼ | 79 | 37 | 150 | 9.7 | 32 |
1½ | 92 | 43 | 150 | 9.7 | 32 |
2 | 108 | 55 | 158 | 9.7 | 32 |
2½ | 127 | 67 | 177 | 12.7 | 32 |
3 | 146 | 83 | 177 | 12.7 | 32 |
3½ | 159 | 96 | 211 | 15.7 | 38 |
4 | 191 | 108 | 211 | 15.7 | 38 |
5 | 238 | 135 | 248 | 19.1 | 38 |
6 | 264 | 162 | 248 | 22.4 | 38 |
8 | 318 | 212 | 288 | 28.4 | 38 |
10 | 397 | 265 | 352 | 35.1 | 44 |
12 | 454 | 315 | 381 | 41.1 | 44 |
14 | 489 | 346 | 398 | 44.5 | 44 |
16 | 562 | 397 | 435 | 50.8 | 44 |
18 | 610 | 448 | 459 | 53.8 | 51 |
20 | 679 | 497 | 493 | 63.5 | 51 |
24 | 787 | 597 | 547 | 73.2 | 51 |
NPS |
Outside Dia A |
Inside Dia B |
Center to End C |
Thick ness t |
Handle Width W |
Pressure Class 900
NPS |
Outside Dia A |
Inside Dia B |
Center to End C |
Thick ness t |
Handle Width W |
1/2 | 60 | 16 | 134 | 6.4 | 32 |
3/4 | 67 | 21 | 137 | 6.4 | 32 |
1 | 76 | 27 | 142 | 6.4 | 32 |
1¼ | 86 | 37 | 151 | 9.7 | 32 |
1½ | 95 | 43 | 151 | 9.7 | 32 |
2 | 140 | 55 | 174 | 12.7 | 32 |
2½ | 162 | 67 | 186 | 12.7 | 32 |
3 | 165 | 83 | 186 | 15.7 | 32 |
4 | 203 | 108 | 217 | 19.1 | 38 |
5 | 244 | 135 | 259 | 22.4 | 38 |
6 | 286 | 162 | 259 | 25.4 | 38 |
8 | 356 | 212 | 307 | 35.1 | 38 |
10 | 432 | 265 | 370 | 41.1 | 44 |
12 | 495 | 315 | 401 | 47.8 | 44 |
14 | 518 | 346 | 412 | 53.8 | 44 |
16 | 572 | 397 | 440 | 60.5 | 44 |
18 | 635 | 448 | 471 | 66.5 | 51 |
20 | 696 | 497 | 501 | 73.2 | 51 |
24 | 835 | 597 | 571 | 88.9 | 51 |
NPS |
Outside Dia A |
Inside Dia B |
Center to End C |
Thick ness t |
Handle Width W |
Pressure Class 1500
NPS |
Outside Dia A |
Inside Dia B |
Center to End C |
Thick ness t |
Handle Width W |
1/2 | 61 | 16 | 135 | 6.4 | 32 |
3/4 | 67 | 21 | 137 | 9.7 | 32 |
1 | 76 | 27 | 142 | 9.7 | 32 |
1¼ | 86 | 35 | 151 | 9.7 | 32 |
1½ | 95 | 41 | 151 | 12.7 | 32 |
2 | 140 | 53 | 174 | 12.7 | 32 |
2½ | 162 | 63 | 190 | 15.7 | 32 |
3 | 172 | 78 | 190 | 19.1 | 32 |
4 | 206 | 102 | 219 | 22.4 | 38 |
5 | 251 | 128 | 256 | 28.4 | 38 |
6 | 279 | 154 | 256 | 35.1 | 38 |
8 | 349 | 203 | 303 | 41.1 | 38 |
10 | 432 | 255 | 370 | 50.8 | 44 |
12 | 518 | 303 | 412 | 60.5 | 44 |
14 | 575 | 333 | 442 | 66.5 | 44 |
16 | 638 | 381 | 472 | 76.2 | 44 |
18 | 702 | 429 | 504 | 85.9 | 51 |
20 | 752 | 478 | 530 | 95.3 | 51 |
24 | 899 | 575 | 603 | 111.3 | 51 |
NPS |
Outside Dia A |
Inside Dia B |
Center to End C |
Thick ness t |
Handle Width W |
Pressure Class 2500
NPS |
Outside Dia A |
Inside Dia B |
Center to End C |
Thick ness t |
Handle Width W |
1/2 | 67 | 16 | 137 | 9.7 | 32 |
3/4 | 73 | 21 | 140 | 9.7 | 32 |
1 | 83 | 27 | 145 | 9.7 | 32 |
1¼ | 102 | 35 | 161 | 12.7 | 32 |
1½ | 114 | 41 | 161 | 15.7 | 32 |
2 | 143 | 53 | 175 | 15.7 | 32 |
2½ | 165 | 63 | 201 | 19.1 | 32 |
3 | 194 | 78 | 201 | 22.4 | 32 |
4 | 232 | 102 | 232 | 28.4 | 38 |
5 | 276 | 128 | 273 | 35.1 | 38 |
6 | 314 | 154 | 273 | 41.1 | 38 |
8 | 384 | 198 | 321 | 53.8 | 38 |
10 | 473 | 248 | 390 | 66.5 | 44 |
12 | 546 | 289 | 427 | 79.2 | 44 |
NPS |
Outside Dia A |
Inside Dia B |
Center to End C |
Thick ness t |
Handle Width W |
- Dimensions are in millimeters unless otherwise indicated.
- Spade Handles shall be solid with NO openings.
- Ring Spacer Handles shall have a single through indicator hole located near the end of the handle. The hole diameter shall not be less than 12 mm.
- Wt = Thickness of the handle should be 6 mm minimum, or equal to Thickness (t) if less than 6 mm.
- Spades and Ring Spacers 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.
- Spades & Ring Spacers 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.
They can be supplied in any grade such as
- Carbon steel
- Super Duplex
- Nickel Alloy
- Stainless Steel
Dimensions of spectacle blinds according to ASME B16.48
A spectacle flange is a specialty flange made of two metal discs attached in the middle by a small section of steel. Spectable flanges get their name because they look like a pair of reading glasses, or spectacles. Spectacle flanges, also known as spectacle blind flanges, are most commonly used on piping systems that need to be separated regularly or where the flow through the systems is regularly stopped. One end of the spectacle flange is solid, while the other end has a hole in the center. The spectacle flange can be rotated to place either the solid or hollow end within the pipe system, thereby opening or closing the flow.
Keywrods: Spectacle Blind Flanges, Spectacle Blind Flange, Spectacle Flanges, Spectacle Blind Flanges manufactory
Advantages of Spectacle Flanges
- Spectacle flanges require no welding for installation
- Spectacle flanges from Yaang Flange have a wide range of pressure tolerances
- Yaang will manufacture spectacle flanges to your specifications
Source: China Spade Flanges Manufacturer – Yaang Pipe Industry (www.steeljrv.com)
If you want to have more information about the article or you want to share your opinion with us, contact us at sales@steeljrv.com
Please notice that you might be interested in the other technical articles we’ve published:
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• HOW TO GET HIGH QUALITY ORIFICE FLANGES
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References:
- https://www.yaang.com
- http://www.wermac.org/flanges/dimensions_spades_ring-spacer_paddle-blind_paddle-spacer.html
- http://www.wermac.org/flanges/flanges_special_spectacle-blinds_spades_ring-spacers_paddle-spacers.html