Spectacle Blind Flange
Figure 8 Pipeline Isolation Flange | ASME B16.48 Standard | Quick Open & Shut Switch
Spectacle Blind Flange also named figure 8 blind flange, the spectacle blind flange integrates a solid blind disc and hollow spacer ring in one connected piece. Installed between pipe flanges, it can be rotated freely to fully block fluid flow or keep pipelines unobstructed, serving as the safest physical isolation device for regular maintenance and pipeline overhaul.
As a professional spectacle blind flange manufacturer and reliable supplier, Pengrun provides various materials of spectacle blind flange. Complies with the ASME B16.48 standard and is suitable for piping systems across various pressure ratings..
Core Advantages of Pengrun Spectacle Blind Flanges
Dual function: block or open pipeline flow
Safer physical isolation than valves
Simple rotation for quick switching
Fully compliant with ASME B16.48
Multiple material options
Supports full high-pressure class ratings
Products Category
Industries
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Comparison Table：Spectacle Blind VS Regular Blind Flange
| Item | Spectacle Blind Flange | Ordinary Solid Blind Flange |
| Structure | Integral figure 8 dual discs | Single solid round plate |
| Operation | Rotate to switch open/closed | Must fully remove for reopening |
| Core Function | Temporary frequent isolation switch | Permanent end sealing |
| Installation | Remain fixed between flanges | Install & uninstall repeatedly |
| Typical Scenario | Regular maintenance pipelines | Permanent pipe end closure |
Applications of Spectacle Blind Flange
OIL & GAS REFINERY
Secure isolation for periodic pipeline maintenance
PETROCHEMICAL PLANT
Safety shutoff for toxic & flammable medium piping
POWER STATION
High-pressure steam pipeline overhaul isolation
OFFSHORE OIL PLATFORM
Harsh marine pipeline safe sectional isolation
LNG TERMINAL
Low-temperature high-pressure pipeline lock-off
CHEMICAL PROCESSING
Regular switch-on/off process pipeline control
