Spiral Wound Gasket Dealers In Balaju Industrial Estate

Spiral Wound Gasket – Overview

A spiral wound gasket (SWG) is a semi-metallic gasket designed for high-temperature and high-pressure sealing applications. It consists of a metal winding (usually stainless steel or special alloys) and a filler material (graphite, PTFE, or mica). The combination provides both flexibility and resilience, making SWGs suitable for critical flanged joints in pipelines, refineries, petrochemicals, power plants, and process industries.

Construction

1. Winding Strip:

   • Formed from a thin strip of metal (SS304, SS316, Inconel, Monel, Hastelloy, etc.).

   • Wound in a spiral with a non-metallic filler.

2. Filler Material:

   • Common: Graphite (high temperature), PTFE (chemical resistance), Mica (extreme heat).

3. Centering Ring (Outer Ring):

   • Carbon steel or stainless steel.

   • Provides correct gasket positioning on the flange.

4. Inner Ring (Optional):

   • Stainless steel or alloy.

   • Prevents inward buckling, protects from corrosion and heat erosion.

Types of Spiral Wound Gaskets

1. Basic Type (Wound Only): No inner/outer ring, used in tongue & groove flanges.

2. With Outer Ring (Type CG): Provides centering and protection.

3. With Inner Ring (Type CGI): Provides internal support and prevents buckling.

4. With Both Inner & Outer Rings: For severe services.

Material Options

• Metal Strip: SS304, SS316, SS321, SS347, Monel, Inconel, Hastelloy, Titanium.

• Filler: Flexible Graphite, PTFE, Mica, Ceramic.

• Rings: Carbon steel, SS304, SS316, other alloys depending on service.

Technical Specifications

• Pressure Class: ASME 150 to 2500

• Temperature Range:

  • Graphite filler: –200°C to +550°C

  • PTFE filler: –200°C to +260°C

  • Mica filler: up to +1000°C (with suitable alloys)

• Standards: ASME B16.20, BS 3381, DIN, API 601, EN 1514-2

• Sizes: ½" to 60" (ASME standard), custom sizes available

Applications

• Refineries & Petrochemicals

• Power Plants (Steam, Gas, Nuclear)

• Chemical Processing Units

• Heat Exchangers, Pumps, Compressors, Valves

• High-pressure & high-temperature piping systems

Advantages

• Excellent sealing at high pressure & temperature.

• Resilient – can accommodate flange surface irregularities.

• Long service life under fluctuating conditions.

• Compatible with a wide range of fluids and gases.

Selection Guidelines

• Choose filler based on operating temperature and chemical compatibility.

• Select metal winding based on corrosion/temperature resistance.

• Decide inner/outer rings based on flange type and service conditions.