The Definitive Guide to Spiral Wound Gaskets (SWG)
In the world of industrial sealing, the Spiral Wound Gasket (SWG) is widely regarded as the most versatile and reliable semi-metallic seal. Designed to handle the "breathing" of pipelines—thermal cycling, pressure surges, and vibration—the SWG is the standard choice for high-pressure refineries and power plants. This guide covers everything from construction to selection. 1. Anatomy of a Spiral Wound Gasket A Spiral Wound Gasket isn't just a single piece of material; it is an engineered composite consisting of three main components: The Sealing Element: A continuous V-shaped metal strip (the "winding") spirally wound with a soft filler material (Graphite, PTFE, or Mica). The V-shape acts like a spring, providing high resilience. The Inner Ring: A solid metal ring that prevents "inward buckling" of the windings under high bolt loads. It also acts as a heat shield and minimizes fluid turbulence. The Outer (Centering) Ring: A solid metal ring that c...