Spectacle Blind Flange A182 ASME Alloy Forged Figure 8 Blind Flange
Spectacle Blind Flange A182 ASME Alloy Forged Figure 8 Blind Flange | SSM
SSM is a professional manufacturer and exporter of ASME A182 Alloy Forged Spectacle Blind Flanges (Figure 8 Blinds). Designed to meet ASME B16.48 and A182 standards, these flanges are ideal for pipeline isolation, maintenance, and inspection in high-pressure and high-temperature systems such as oil & gas, petrochemical, and marine industries.
1. Product Overview
A Spectacle Blind Flange, also known as a Figure 8 Blind, consists of two discs - one solid (blind) and one open (spacer) - connected by a small bridge.
It allows easy switching between open and closed pipeline positions without removing the entire assembly, ensuring safe and efficient isolation of process lines.
Standard: ASME B16.48 / ASME B16.5
Material: Alloy Steel (ASME A182 F5, F9, F11, F22, F91, etc.)
Size Range: DN15–DN600 (½"–24")
Pressure Rating: Class 150–2500
Facing Type: RF / RTJ / FF
Form: Spectacle Blind / Figure 8 Blind
2. Material Composition (Example: ASTM A182 F11)
| Element | Content (%) |
|---|---|
| Carbon (C) | 0.05 – 0.15 |
| Chromium (Cr) | 1.00 – 1.50 |
| Molybdenum (Mo) | 0.44 – 0.65 |
| Silicon (Si) | ≤ 0.50 |
| Manganese (Mn) | 0.30 – 0.60 |
| Phosphorus (P) | ≤ 0.025 |
| Sulfur (S) | ≤ 0.025 |
| Iron (Fe) | Balance |
The Cr-Mo alloy composition offers excellent creep resistance, oxidation resistance, and mechanical strength at elevated temperatures.
3. Mechanical Properties
| Property | Typical Value |
|---|---|
| Tensile Strength | ≥ 485 MPa |
| Yield Strength | ≥ 275 MPa |
| Elongation | ≥ 20% |
| Hardness (HBW) | ≤ 197 |
| Service Temperature | -40°C to +600°C |
4. Key Features
✅ High-Temperature Strength: Retains toughness under extreme heat and pressure.
✅ Superior Corrosion Resistance: Performs reliably in steam, hydrogen, and chemical processing environments.
✅ Easy Maintenance: Quick switch between open and closed modes for line isolation.
✅ Precision Forging: Manufactured from high-quality forged alloy steel for durability.
✅ Custom Options: Available with RF, FF, or RTJ faces and in special materials like F5, F22, or stainless steel grades.
5. Advantages and Limitations
Advantages:
Excellent long-term stability in power, petrochemical, and refinery applications.
Withstands high thermal and pressure cycling.
Compliant with ASME, MSS, and international specifications.
Limitations:
Heavier than standard blind flanges.
More costly due to dual-disc forging and precision machining.
6. Applications
Refinery and Petrochemical Pipelines
Power Generation & Boiler Systems
Heat Exchangers and Pressure Vessels
Oil & Gas Processing
Steam and Chemical Plants
7. Why Choose SSM
Over 30 years of manufacturing experience in forged alloy flanges
Certified to ISO 9001 and EN 10204 3.1
100% compliance with ASME B16.48, A182, and MSS SP-44
Advanced CNC machining and NDT inspection for quality assurance
Global supply network and custom design capabilities
8. Conclusion
The A182 ASME Alloy Forged Spectacle Blind Flange (Figure 8 Blind) from SSM is built for durability, precision, and safety in demanding pipeline systems.
With outstanding strength, corrosion resistance, and temperature endurance, it provides a dependable solution for pipeline isolation and maintenance in industrial environments.
📩 Contact SSM today for inquiries or customized Spectacle Blind Flange solutions for your project.
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