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.
Carbon steel: A105
Alloy steel: A182 F 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-316N-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 70
American System: CLASS 150, CLASS 300, CLASS 400, CLASS 600, CLASS 900, CLASS 1500, CLASS 2500
American System: Raised Face (RF), 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.