The Spiral Wound Gasket is the most widely used metal gasket in industrial environments that cover an extensive range of pressure and temperature conditions. They are frequently utilized in the gas and oil, electrical, chemical, petrochemical and food industries to stop leaks from Flange joints. Flexitallic created an innovative spiral wound gasket back in 1912 in order to meet the needs of US refinery operations that require extreme temperatures and pressure fluctuations.
The spiral-wound gaskets can be extensively used in a range of purposes.
- Applications for high-temperature services
- High-pressure applications
- Fluids that are highly corrosive
- Fluids that ignite
Major Parts of the Spiral Wound Gasket
The spiral-wound gasket can be described as a semi-metallic one. It is made of the form of a spirally wound v-shaped made from filler materials made of non-metallic and metallic. The spiral wound gasket is comprised of three primary components. The three main components are:
- Outer rings: The outer ring of spiral wound gaskets, sometimes referred to as an oblique ring or a centering ring, is typically made of carbon steel. Its main function is to help center the gasket and then fit it to a bolted flange joint.
- Inner Ring: The inner ring is an essential part of spiral wound gaskets because it keeps the windings from breaking within the pipe. If a gasket is bent parts of it are pushed into the pipe, and then traverse the pipe system, and eventually they are stuck in a loop or tied to something. Rings inside the gasket prevent this from happening and can lessen the likelihood of this type of issue.
- sealer element: It is the component of the gasket that is spiral wound that creates a secure seal that prevents leakage. The sealing component includes the filler material as well as the windings. In general spiral wound gaskets, they are produced with a flexible graphite filler material that is able to endure extreme temperatures. Utilizing graphite filler material helps the gasket to avoid joint displacement and deformation of the flange. PTFE is another popular filler material (Polytetrafluoroethylene). But, PTFE is not ideal for use in extreme temperature conditions. The stainless steel as well as Monel tend to be the more frequently used winding materials.
Signs on gasket’s spiral wound
Spiral wound gaskets can be distinguished by different marks within the gasket. Each mark is precise regarding the specifications of the spiral wound gasket which can aid in the process of selecting a gasket.
The marks on the gasket’s spiral wound contain the following vital details:
- The Design Standard or Code:The code that is used to design and create an elongated gasket can be seen. The ASME B16.20 standard ASME B16.20 is clearly visible on the gasket.
- Manufacturer’s Information about the Spiral Wound Gasket:The manufacturer of the gasket can be identified by examining the name of the manufacturer in the seal.
- Material for Filler and Winding:The winding and filler materials are listed in the spiral gasket that has been wound.
- Diameter, Pressure Class Diameter and Pressure Class marks on the gasket indicate the dimensions of the gasket, as well as the amount of load the gasket that is wound spirally will be able to handle. The pressure classes of spiral-wound gaskets typically are 150 300, 400, 800, 600, 1000 and 2500. The ability of the gasket that is spiral wound to withstand pressure increases when the pressure class is increased.
The size of Spiral Wound Gasket –The thickness of spiral wound gaskets usually can vary between 3.2 millimeters to 4.5 millimeters. For extremely massive diameters, a thickness of 5.5 7 mm to 5.5 millimeters is suggested. The market provides a broad range of gasket thicknesses that are spiral wound, ranging from 1.6 millimeters to 7.2 millimeters.
Pressure Ratings for Spiral Wound Gaskets- Spiral wound gaskets come in seven pressure rating classes. The classes are 150 300 400 600, 900, 1500 and 2500. These are the design parameters used in determining the dimensions of gaskets that are spiral wound. ASME B16.20 for instance contains spiral wound gasket sizes charts in the form of tabular charts that contain all of the parameters required that are based on size and pressure class.