Alloy steel spectacle blind flanges, also known as spade and spacer flanges, are used in piping systems to isolate sections of the pipeline for maintenance or to permanently close off a pipe. This flange type consists of two parts: a solid blind flange and a spacer flange, which are joined together in a single piece. The spectacle blind flange is designed to be inserted into the pipeline and bolted in place to provide a reliable and robust seal. Made from high-strength alloy steels such as ASTM A182 F11, F22, and A350 LF2, these flanges offer exceptional durability and resistance to high temperatures and pressures. They are commonly used in industries such as oil and gas, chemical processing, and power generation where high safety and reliability standards are required. The spectacle blind design allows for quick and easy installation and removal, making it an efficient solution for isolating sections of the pipeline.
| Property | Details |
|---|---|
| Material | Alloy Steel (e.g., ASTM A182 F11, A182 F22, A350 LF2) |
| Standards | ASTM A182, ASTM A350 |
| Type | Spectacle Blind Flange (Spade and Spacer) |
| Flange Dimensions | Sizes typically from 1″ to 24″ |
| Pressure Rating | Class 150, Class 300, Class 600, Class 900, Class 1500 |
| Temperature Rating | Up to 650°C (1200°F) for high-alloy steels |
| Surface Finish | Smooth, sometimes with a raised face (RF) |
| Connection Type | Bolted connection |
| Design | Two parts: Blind flange and spacer flange |
| Advantages | Quick installation, easy removal, reliable isolation |
| Applications | Oil and gas, chemical processing, power generation |
| Manufacturing | Forged or cast, heat-treated |
| Ordering Information | Specify material grade, size, pressure class, and standard |
| Suppliers | McMaster-Carr, Grainger, Swagelok, Penn Stainless Products |
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