Spectacle flange is made up with two metal discs which are attached to each other by a small section of steel. Its shape is similar to a pair of glasses or "spectacles". One end of the flange will have an opening to allow flow through the pipe during operation and the other end is solid to block flow during maintenance.
ASME B16.48-2005 API590-1985
Alloy steel:A182F 1-F 2-F 5-F 9-F 10-F 91-F 92-F 122-F 911-F 11-F 12-F 21-F 22
Stainless steel:A182 304-304H-304L-304N-304LN 316-316H-316L-316LN 321-321H 347-347H
Low-temperature steel:A522 A707 Grade L 1-L 2-L 3-L 4-L 5-L 6-L 7-L 8
High-performance steel:A694 F 42-F 46-F 48-F 50-F 52-F 56-F 60-F 65-F 70F
American System:CLASS150 CLASS300 CLASS400 CLASS600 CLASS900 CLASS1500 CLASS2500
Flat face(FF),Raised face(RF),Tongue face(T),Groove face(G),Female face(F),Male face(M),Ring joints face(RJ).
Cutting of Raw Material-Die Forging-Machining
The flange is widely used in many areas such as power generation plant, petroleum industry,natural gas system,chemical industry,shipbuilding industry,heating system,paper-making industry,metallurgy industry,etc.