| DN10(3/8") | DN15(1/2") | DN20(3/4") | DN25(1") | DN40(1-1/2") |
| DN50(2") | DN80(3") | DN100(4") | DN125(5") | DN150(6") |
| DN200(8") | DN250(10") | DN300(12") | DN350(14") | DN400(16") |
| DN450(18") | DN500(20") | DN550(22") | DN600(24") |
| 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 |
| 1.1/4 | 73 | 42 | 145 | 6.4 | 32 |
| 1.1/2 | 83 | 48 | 145 | 6.4 | 32 |
| 2 | 102 | 61 | 155 | 6.4 | 32 |
| 2.1/2 | 107 | 73 | 170 | 6.4 | 32 |
| 3 | 133 | 89 | 170 | 6.4 | 32 |
| 3.1/2 | 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 |
A spectacle blind, also known as a figure-8 blind, is a safety device used in piping systems to isolate a section of the pipe folmaintenance, inspection, or shutdown.
It consists of two metal discs connected by a small section in the middle, resembling a pair of spectacles or the fiqure-8, hence itsname. One disc is a solid plate (blind, and the other is a ring (spacer. The spectacle blind is inserted between two flange joints toeither block the flow completely (using the blind side) or allow it to pass through (using the spacer side).
Functionality and Use:
lsolotion: When the solid plate lblind) side faces the pipeline, it acts as a barrier, preventing flow and ensuring that thesection is completely isolated. This is crucial for maintenance work or in emergency shutdown situations where it'snecessaryto ensure no fluid passes through a segment of the piping system.
Operational Flow: When the system is in normal operation, the ring (spacer side is positioned to align with the pipeallowing unrestricted flow, The spacer essentially acts as part of the pipeline during normal operations.
Quick Changeover: The design of the spectacle blind enables quick and easy changeover between the open lspacerl andclosed (blind) positions by simply rotating the spectacle blind without removing it from the flange. This convenience makesit highly efficient for systems that require frequent switching between operation and maintenance modes.
Advantages:
Versatility: Spectacle blinds are suitable for various industrial applications, including oil and gas, chemical processing, andpower generation, where pipeline isolation is frequently necessary.
Safety: By providing a physical barrier in the pipeline, spectacle blinds significantly enhance safety during maintenance orin case of system failure.
Cost-Effectiveness: since they can be easily rotated without being fully removed from the pipeline, spectacle blinds reducedowntime and labor costs associated with system isolation.
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