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🔩 Spiral Wound Gasket – Detailed Overview
A Spiral Wound Gasket is a high-performance semi-metallic gasket designed for high pressure and high temperature applications. It is constructed by spirally winding a V-shaped metal strip (usually SS 304 / SS 316 / CS) with a soft filler material such as graphite or PTFE. This unique construction provides excellent resilience and sealing efficiency.
🔧 Key Features
Excellent sealing performance under fluctuating pressure and temperature
High recovery & flexibility, compensating for flange movement
Fire-safe and blow-out resistant design
Suitable for steam, oil, gas, chemicals, hydrocarbons, and corrosive fluids
📏 Construction Types
Basic Type (R)
With Inner Ring (IR) – protects gasket from media erosion
With Outer Ring (CG) – ensures correct centering and prevents over-compression
Inner + Outer Ring (CGI) – most commonly used in critical services
📐 Specifications
Standards: ASME B16.20, DIN, JIS
Pressure Rating: Up to 250 bar (depending on design)
Temperature Range: From –200°C to +550°C (material dependent)
Sizes: ½″ to 60″ (DN15 to DN1500)
🏭 Applications
Used in refineries, petrochemical plants, power plants, boilers, heat exchangers, pipelines, and valves.
✅ Advantages
Long service life
Leak-proof sealing
Reliable in severe operating conditions
