Round Wire Gasket
Overview
Spiral wound gaskets are widely used in industries requiring reliable sealing under extreme conditions, such as oil and gas, petrochemicals, and power generation. Their design combines a metal winding (typically stainless steel) with a soft filler material like graphite or PTFE, creating a balance of strength and flexibility. These gaskets are essential for flanged connections, ensuring leak-tight seals even during thermal cycling or mechanical stress. Their versatility makes them suitable for diverse media, including steam, hydrocarbons, and corrosive fluids.
Structure and Working Principle
The gasket consists of a spiral-wound metal strip and filler layer, bonded to inner and outer metal rings (centering rings). The metal strip provides structural support, while the filler compresses to fill flange imperfections. When installed between flanges, bolt torque compresses the filler, creating a seal. The spiral design allows the gasket to absorb fluctuations in pressure and temperature without losing integrity. The outer ring aligns the gasket, while the inner ring prevents filler blowout in high-flow systems.
Key Features
Spiral wound gaskets excel in high-pressure (up to 25,000 psi) and high-temperature (up to 1000°C, depending on materials) applications. Their resilience accommodates flange misalignment and surface irregularities. Customizable materials cater to specific needs: graphite for heat resistance, PTFE for chemical inertness, and exotic metals like Inconel for corrosive environments. Their reusability (if undamaged) and compliance with international standards (ASME B16.20, EN 1514) add to their reliability.
Application Areas
Primary sectors include oil refineries, chemical processing, and power plants, where they seal pipelines, reactors, and heat exchangers. They are also used in LNG facilities, pharmaceuticals, and shipbuilding. Specific applications involve sealing hazardous fluids, such as sour gas (H2S) or acidic compounds, where leakage could pose safety or environmental risks. Their adaptability to ASME, DIN, and JIS flange standards ensures global usability.
Maintenance and Precautions
Inspect gaskets for cracks, corrosion, or filler degradation before installation. Replace if defects are found. Follow torque specifications to avoid under-compression (leaks) or over-compression (filler damage). Store gaskets in dry, temperature-controlled environments to prevent filler oxidation or metal corrosion. Avoid contact with oils or solvents unless compatible. Use alignment tools during installation to prevent misplacement.
B2B Procurement Guide
When sourcing spiral wound gaskets, verify certifications (e.g., ISO 9001) and material test reports (MTRs). Specify dimensions (inner/outer diameter, thickness), pressure class (e.g., 150# to 2500#), and filler/metal combinations. Bulk purchases may offer cost savings, but ensure consistent quality. Leading manufacturers include Garlock, Flexitallic, and Lamons. For custom orders, provide operational parameters (temperature, pressure, media) to ensure suitability.
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