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Carbon Steel ASTM A105N Forged Flange Spectacle Flange Manufacturer ASME B16.5

What is a Spectacle Flange and what about its specification and advantages.

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What is a Spectacle Flange ?

Figure 8 or Spectacle Blind, is made by a steel spade and spacer, united by a welded handle. Spectacle Blind may have a different type of joint face (RF Raised Face, FF Flat Face, RTJ Ring Joint), depending the type of flange.The Spectacle Blind is usually used on the oil line with two different functions:If the spade is put in between the flanges, it stops the fluid’s passage;If the spacer is put in between the flanges, the passage of the fluid is allowed.The Spectacle Blind is inserted between two flanges: in order to guarantee a perfect waterlight two gaskets are normally mounted , one on each side of spectacle blind.

Specification of Spectacle Flange

Size Range 1/2″-24″/DN15-DN60
Pressure Rating Class150/300/600/900/1500/2500lb
America Standard ASME B 16.5/ASME B 16.47 SERIES a/b
Carbon Steel ASTM A150/A150N
Low Tem Carbon Steel ASTM A350 LF2/LF3
Pipeline Steel ASTM A694  F42/46/56/60/65
Alloy Steel ASTM A182 F11/F12/F5/F9/F91/F92
Stinless Steel ASTM A182 F304/304L/304H,316,316L,310S,317,347,904L

Advantages of Spectacle Flange

  • Spectacle flanges require no welding for installation
  • Spectacle flanges from Sunny Steel Flange have a wide range of pressure tolerances
  • Sunny Steel will manufacture spectacle flanges to your specifications
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