Spiral Wound Gasket — Technical Data Sheet
A spiral wound gasket is made by winding a V-shaped metal strip and a soft filler together. The winding gives resilience under changing pressure and temperature; the outer centering ring locates the gasket and limits compression.
Specification
| Product | Spiral wound gasket with centering ring, with or without inner ring |
|---|---|
| Supply | Stockist and supplier — sourced from approved manufacturers; not manufactured by Teshi Group |
| Standard | ASME B16.20, for ASME B16.5 and ASME B16.47 flanges |
| Size range | NPS ½" to 24" (B16.5); NPS 26" to 60" (B16.47) |
| Pressure classes | Class 150 to 2500 |
| Winding metal | SS 304, SS 316L, SS 321, SS 347, Monel, Inconel |
| Filler | Flexible graphite, PTFE, mica |
| Centering (outer) ring | Carbon steel, zinc plated or painted; stainless steel on request |
| Inner ring | Same alloy as the winding |
| Thickness | Winding 4.5 mm nominal; rings 3.0 mm nominal |
Materials
| Winding / filler | SS 304 + graphite (yellow ring edge, grey stripe); SS 316L + graphite (green, grey stripe); SS 316L + PTFE (green, white stripe) |
|---|
Typical applications
- Raised-face flanged joints in steam, hydrocarbon and process service
- Joints subject to pressure and temperature cycling
Supply
Spiral Wound Gasket is stocked and supplied by Teshi Group from approved manufacturers. It is not manufactured by Teshi Group; the original manufacturer's test certificate accompanies every consignment.
Inspection and testing
- Manufacturer's dimensional inspection to ASME B16.20.
- Verification of colour coding, marking and winding condition on receipt.
- Material certificates for winding and rings on request.
Marking
Marked on the centering ring to ASME B16.20: manufacturer, size, class, winding metal, filler, ring materials and standard. Ring edge colour-coded by winding metal and filler.
Documentation
Manufacturer's certificate of conformity; material certificates on request.
Packing
Individually wrapped and packed flat on plywood boards to prevent distortion.
Ordering information
Please state the following on your enquiry:
- Flange standard, size and class
- Winding metal and filler
- Inner ring: required or not, and material
- Outer ring material
- Quantity
Reference information compiled from the published standard for convenience. It does not replace the current edition of the governing standard, which takes precedence. Verify critical dimensions and properties before design, purchase or fabrication. Teshi Engineers & Sales Promoters (P) Ltd accepts no liability for errors or omissions.
FAQ
Spiral Wound Gasket: common questions
What do the colours on a spiral wound gasket mean?
The ring-edge colour shows the winding metal (yellow for 304, green for 316L) and the stripes show the filler (grey for graphite, white for PTFE), as set out in ASME B16.20.
Related products, data sheets and standards
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