A flange spade is a metallic ring to isolate the pipeline for maintenance works. A ring space is a bored metallic ring that replaces the flange spade when the pipeline is opened again. These two pipeline isolation devices are used instead of Spectable blinds (which combine a flange spade and a ring spacer in one single device) in case of narrow installation areas.

 

A flange spade, otherwise called steel “spade”, or “single-blind” or “blank”, is a metallic ring used to blind (isolate) a pipeline, similarly to spectable blinds

A ring spacer is a metallic device inserted between the flanges when the spade is removed and the pipeline is, therefore, open again (i.e. it acts as a temporary placeholder).

Operators can easily understand whether a flange spade or a ring spade is installed on the pipeline at any point in time: indeed, the handlers of ring spacers feature a single indication hole (12 mm diameter), whereas flange spades have instead two indication holes (visual indication).

Flange spades and ring spacers are manufactured according to the ASME B16.48 specification and belong to the family of pipeline isolation devices.

Flange spade and ring spacer

A flange spade (right side) and a ring spacer (left side).

 

FLANGE SPADE VS SPECTABLE BLINDS

A spectable blind is simply the combination, in one single device, of a flange spade and a ring spacer (and for this reason, flange spades are called “single-blinds” or “blanks”). 

Spades and ring spacers are used in case a spectable blind can’t be installed due to space constraints.

Spades, ring spacers, and spectable blinds are available in multiple sizes (from 1/2 inch to 24 inches, and pressure rating from 150 to 2500#) and material grades (the same available for standard flanges) depending on the fluid conveyed by the pipeline.

The difference between spades/ring spacers and spectable blinds is shown in the image:

difference spade and spectable blind

 

FLANGE SPADE AND RING SPACER DIMENSIONS ASME B16.48

CLASS 150 SPADE AND RING SPACER DIMENSIONS

(Dimensions in mm)

Flange spade and ring spacer
Flange spade and ring spacer
NPS A B C t W
 1/2 45 16 126 3 32
 3/4 54 21 131 3 32
1 64 27 136 3 32
73 42 145 6.4 32
83 48 145 6.4 32
2 102 61 155 6.4 32
107 73 170 6.4 32
3 133 89 170 6.4 32
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

 

CLASS 300 SPADES AND RING SPACERS DIMENSIONS

Flange spade and ring spacer

NPS A B C t W
 1/2 51 16 129 6.4 32
 3/4 64 21 136 6.4 32
1 70 27 139 6.4 32
79 42 150 6.4 32
92 48 150 6.4 32
2 108 61 158 9.7 32
127 73 177 9.7 32
3 146 89 177 9.7 32
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

 

CLASS 600 SPADES AND RING SPACERS DIMENSIONS

Flange spade and ring spacer

NPS A B C t W
 1/2 51 16 129 6.4 32
 3/4 64 21 136 6.4 32
1 70 27 139 6.4 32
79 37 150 9.7 32
92 43 150 9.7 32
2 108 55 158 9.7 32
127 67 177 12.7 32
3 146 83 177 12.7 32
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

 

CLASS 900 SPADES AND RING SPACERS DIMENSIONS

Flange spade and ring spacer

NPS A B C t W
 1/2 60 16 134 6.4 32
 3/4 67 21 137 6.4 32
1 76 27 142 6.4 32
86 37 151 9.7 32
95 43 151 9.7 32
2 140 55 174 12.7 32
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

 

CLASS 1500 SPADES AND RING SPACERS DIMENSIONS

Flange spade and ring spacer

NPS A B C t W
 1/2 61 16 135 6.4 32
 3/4 67 21 137 9.7 32
1 76 27 142 9.7 32
86 35 151 9.7 32
95 41 151 12.7 32
2 140 53 174 12.7 32
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

 

CLASS 2500 SPADES AND RING SPACERS DIMENSIONS

Flange spade and ring spacer

NPS A B C t W
 1/2 67 16 137 9.7 32
 3/4 73 21 140 9.7 32
1 83 27 145 9.7 32
102 35 161 12.7 32
114 41 161 15.7 32
2 143 53 175 15.7 32
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