Spiral Wound Gasket with Inner & Outer Ring
Ferrobend Spiral Wound Gaskets with Inner and Outer Ring provide enhanced sealing stability for critical industrial services. The dual-ring construction supports accurate centering, compression control, and protection of the sealing element under demanding pressure and temperature conditions.
Product Overview
A dual-ring spiral wound gasket combining bore reinforcement with external centering. The inner ring helps prevent inward buckling; the outer ring supports positioning, handling and compression control.
| Product type | Semi-metallic spiral wound gasket |
|---|---|
| Construction | Dual-ring semi-metallic sealing element with inner and outer rings. |
| Standard / design basis | ASME B16.20; other configurations as specified below |
| Nominal size range | ½" to 60" nominal sizes; custom dimensions available; metric and imperial dimensions |
| Pressure classes | ASME Classes 150, 300, 600, 900, 1500 and 2500 |
| Winding material | Stainless steel and selected alloys; available grades listed below |
| Filler material | Graphite, PTFE and other listed fillers, selected for the service |
| Ring arrangement | Inner and outer rings |
Standards, Dimensions & Pressure Classes
| ASME B16.20 | Metallic gasket requirements applicable to the specified spiral wound gasket design. |
|---|---|
| ASME B16.5 | Relevant flange dimensional requirements for compatible flange configurations. |
| API Requirements | Referenced for applicable refinery, petrochemical, and energy-sector requirements. |
| EN / DIN | International flange configurations available according to project requirements. |
Sizes & pressure classes
- Nominal sizes
- ½" to 60" nominal sizes; custom dimensions available; metric and imperial dimensions
- Pressure classes
- ASME Classes 150, 300, 600, 900, 1500 and 2500
- Flange compatibility
- Raised Face (RF); ASME B16.5, ASME B16.47, EN and DIN flange configurations as specified.
Use the selected standard, flange dimensions and ring configuration together. Confirm each size / class combination and custom geometry before ordering.
International references are subject to the specified configuration. Confirm the exact standard and drawing with the enquiry.
Technical Specifications
| Sealing element | Precision spiral wound metallic strip with selected resilient filler. |
|---|---|
| Inner ring function | Radial support and protection of the winding near the gasket bore. |
| Outer ring function | Centering, compression control, handling support and an external winding boundary. |
| Structural stability | Combined inner and outer ring support for critical services. |
| Thermal cycling | Recovery during repeated heating and cooling. |
| Temperature capability | Dependent on selected winding and filler materials |
| Pressure capability | ASME Classes 150, 300, 600, 900, 1500 and 2500; suitability depends on gasket design and operating conditions. |
| Flange compatibility | Raised Face (RF); ASME B16.5, ASME B16.47, EN and DIN flange configurations as specified. |
| Manufacturing | Controlled winding and dimensional inspection throughout production. |
Temperature, pressure and chemical suitability must be considered together for the selected winding, filler and flange joint. Confirm the required thickness and service limits with the enquiry.
Quality & Testing
| Visual Inspection | Verification of winding quality, ring finish, and workmanship. |
|---|---|
| Dimensional Inspection | Confirmation of gasket dimensions, thickness, and ring geometry. |
| Material Verification | Validation of metallic winding, rings, and filler materials. Incoming raw materials are also checked before production. |
| Documentation | Inspection records and material certification documentation as required. |
Finished gaskets receive final inspection before dispatch. Material certificates and inspection documentation are available on request.
Downloads & Documents
Browse the existing online guides, or request product-specific documents from our team.
Frequently Asked Questions
Which pressure classes and sizes are available?
ASME Classes 150, 300, 600, 900, 1500 and 2500. The stated nominal size range is ½" to 60"; custom sizes are available. Confirm the size / class combination for the selected standard.
Which materials can be supplied?
Choose from the component-specific winding, filler and ring options listed above. Final material selection depends on the process media and service conditions.
Which standards are supported?
ASME B16.20 is listed as the primary gasket standard. Other dimensional or flange configurations remain subject to the project-specific requirements shown above.
Can custom sizes and configurations be supplied?
Yes. Custom dimensions and material combinations are available to project requirements. Confirm the flange geometry and service conditions with the enquiry.
How should the gasket be installed and stored?
Follow the product-specific positioning and tightening steps above. Keep unused gaskets in their original packaging in a clean, dry location away from moisture, chemicals and direct sunlight. Protect them from bending and heavy loads.
Get a quote for your gasket configuration
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