The spectacle blind is a wafer fitting designed to swivel around one of the flange bolts. They have the advantage over blanking spades of it being quite clear as to whether the blind is in the open or closed position. For the most popular sizes CRP supply an extremely robust blind with a stainless steel core lined in PFA which does not suffer from PTFE movement of the flared faces which can occur on other designs.
| Pipeworks (NB) | ORF | OID | O.P.C.D | T | OB | A | Min Lining THK | ||
| Inches | mm | mm | mm | mm | mm | mm | mm | mm | mm |
| 1" | 25 | 51 | 19 | 79.4 | 16 | 14.3 | 55 | 22 | 3.5 |
| 1.1/2" | 40 | 73 | 34 | 98.4 | 16 | 17.5 | 80 | 25 | 3.5 |
| 2" | 50 | 92 | 45 | 120.6 | 19 | 19 | 100 | 27 | 3.5 |
| 2.1/2" | 65 | 105 | 55 | 139.7 | 19 | 22.2 | 110 | 30 | 3.5 |
| 3" | 80 | 127 | 69 | 152.4 | 19 | 23.8 | 135 | 32 | 4 |
| 4" | 100 | 157 | 92 | 190.5 | 19 | 23.8 | 165 | 32 | 4 |
| 6" | 150 | 216 | 144 | 241.3 | 22.2 | 25.4 | 225 | 35 | 4.5 |
| 8" | 200 | 270 | 192 | 298.4 | 22.2 | 28.6 | 278 | 38 | 5 |
| 10" | 250 | 324 | 241 | 361.9 | 25.4 | 30.2 | 330 | 40 | 5.5 |
| 12" | 300 | 381 | 296 | 431.8 | 25.4 | 31.8 | 390 | 40 | 5.5 |
| Testing/Inspection | Mechanical Properties | ||||
| PTFE | PFA | FEP | |||
| Hydro Test | At 29 Bar, after lining | Tensile Strength, PSI (min) | 3500 | 3800 | 3000 |
| Spark Test | At 25 KV | Elongation, % (min) | 300 | 300 | 250 |
Agriculture Industry | Chemicals Industries |
Food Industries | Refineries Industries |
Cement Industries | Pharmaceutical Industries |
Oil & Gas Industries | Fertilizers Industries |
Steel Industries | Water Treatment Plants |
Dairy Plants | Petro-Chemicals Industry |
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