Composition
Spiral wound gaskets are manufactured by coiling a V-profile metal strip together with a soft filler material, forming a flexible and pressure-resistant sealing element. The metal strip provides structural integrity and elasticity, while the filler ensures effective sealing performance. To enhance stability, control compression, and facilitate installation, the winding is supported by an outer guide ring and by an inner ring for RF flanges. Spiral wound gaskets for LMF flanges should be supported by an inner ring, although this is not mandatory, while those for LTG flanges are supplied without rings. The metal used for the inner rings matches that of the metal strip, whereas the guide ring material is user-selected. The stamped markings and color codes on the spiral wound gasket comply with ASME B16.20.
- Metal strip: any type of steel or alloy is available
- Filler: PTFE
Characteristics
Planisteel LS SW P Low Stress spiral wound gaskets are primarily manufactured in accordance with ASME B16.20, ASME B16.47 Series A and B, EN 12560-2, and EN 1514-2 standards, but gaskets made to other international standards or customized specifications are also available.
Planisteel LS SW P spiral wound gaskets, specifically designed and manufactured using carefully selected materials and tightly controlled processes, ensure maximum safety and freedom from contaminants, offering high reliability even in the most critical environments.
| Performance Specifications | UM | Value |
|---|---|---|
| Minimum temperature | °C | -200 |
| Maximum Temperature | °C | 260see note |
| Maximum Pressure | bar | according to the gasket rating |
| PTFE Chemical Resistance | pH | 0 ÷ 14 |
| Min. Gasket Seating Stress - Sgmin-SL=0.001 | MPa | 40 |
| Min. Gasket Operating Stress - Sgmin-O | MPa | 25 |
| Max Gasket Operating Stress - Sgmax | MPa | 280 |
The sealing factors were obtained from tests carried out on the SWCI design.
PTFE is not suitable for use with molten alkali metals, elemental fluorine (F₂), fluorinated gases, concentrated nitric acid, or in combination with other oxidizing agents.
Applications
Spiral wound gaskets for piping flanges, valves, and industrial equipment.
