Spectacle Blinds

Spectacle blinds are a more permanent form of blanking spade, they are built into the pipeline and can provide a relatively quick and effective positive pipe line shut off to allow piping maintenance, cleaning in place etc. They are available in two distinct designs, the sliding spectacle blind and the figure 8 type that is rotated around a central pivot bolt. CRP supply both types, the sliding spectacle blinds are manufactured from solid PTFE and the figure 8 type from stainless steel lined in PFA or PTFE depending on size. In their open state they allow unhindered flow through the pipeline, when slid / rotated into their closed position they very effectively seal the pipeline.

Please note we only supply PTFE/PFA lined or solid PTFE spades and blinds, we do not supply metallic blinds with serrated faces etc. typically used in the petrochemical industry.

Sliding type to suit ASME 150 Piping System

 Sliding Spectacle Blind  

To Suit Pipework NB A B C
Inches mm mm mm mm
1/2" 15 89 60
10
3/4" 20 99 70
10
1" 25 108 79
10
1.1/2" 40 127 98
10
2" 50 152 121
16
3" 80 190 152
16
4" 100 229 191
27
6" 150 279 241
27
8" 200 343 298
27

 

Once the flange joint has been jacked apart the blind is slid from open to closed on two bolts

Figure 8 type to suit ASME 150 Piping System

   Figure 8 Spectacle Blind Diagram

PFA lined stainless steel

To Suit Pipework NB Ø A B C
Inches mm mm mm mm
1/2" 15 44 30 11
3/4" 20 54  35 11
1" 25 64 39.7 14
1.1/2" 40 83 49.2 14
2" 50 102 60.3 14
3" 80 134 76.2 14
4" 100 172 95.3 16
6" 150 219 120.6 22 
8" 200 276 149 22
10" 250 337 181 22
12" 300 406 216 27

Please note we only supply PTFE/PFA lined or solid PTFE spades and blinds, we do not supply metallic blinds with serrated faces etc. typically used in the petrochemical industry.

 


Contact Details

Corrosion Resistant Products Ltd
Todmorden Road
Littleborough
OL15 9EG

Phone: +44(0)1706 756400
Fax: +44(0)1706 379567
Email: