How much do spiral wound gaskets compress?
Standard spiral wound constructions consist of a wind- ing element that is . 175-in thick with a corresponding outer guide ring thickness of . 125-in (nominal). This allows for an approximate 30 percent compression to the winding element when installed.
What temperature range can spiral wound gaskets operate at?
Spiral Winding Materials
| Winding Materials | Temperature Range | Max PSI/BAR |
|---|---|---|
| 321 Stainless Steel | min-250 max 550 °C | 870°C |
| Monel 400 | min -125 max 600 °C | 800°C |
| Nickel 200 | min – 250 max 600 °C | 600°C |
| Titanium | min – 250 max 350 °C | 450°C |
Where do you place a spiral wound gasket?
A Spiral Wound Gasket is the most common metallic gasket used in industrial plants. A properly selected and installed spiral wound gasket can withstand high temperatures and pressures, preventing leaks throughout their intended lifespan.
What is the difference between CG and CGI gasket?
Style CG – Is comprised of a sealing element and outer metal ring. Style CGI – In addition to an outer metal ring the CGI style gasket is fitted with an inner metal ring, constraining the sealing element on both internal and external diameters.
How does a spiral wound gasket work?
Spiral-wound gaskets usually come with both an inner metal core and an outer metal ring. These are thinner than the coiled gasket material, so limiting how much the gasket can compress. The inner core also increases blowout resistance; one reason this design works well with high pressures.
What is spiral wound gasket used for?
The spiral wound gaskets or semi-metallic gaskets are designed for the widest range of operating conditions of temperature and pressure. They are used in raised face flanges, male and female flanges, and tongue and groove flanges. They are also reliably used in high-temperature and high-pressure applications.
How thick is a spiral wound gasket?
The standard manufacturing thicknesses for spiral wound gaskets are:3,2mm; 4,5mm; 6,5mm (measured across metallic strip not including the filler, which protrudes slightly beyond the metal). The tolerance of the gasket diameters (d1, d2, d3, d4, s, s1) are stipulated by ASME B 16.20 and EN 1514-2 standards.
What is CGI in gaskets?
The CGI is a CG style spiral wound fitted with an internal ring which gives an additional compression limiting stop and prevents inward buckling ring. The inner rings are typically made from the same material as the windings, but can be produced in other alloys depending on service.
What is the purpose of inner ring in spiral wound gasket?
Spiral Wound Gaskets The inner ring prevents inner buckling of the sealing element, and creates a physical barrier that shields the sealing element from heat and media while preventing erosion.
Can you use spiral wound gasket on flat face?
Style CGI spiral wound gaskets are suitable for use on flat-face and raised-face flanges, and can be specified for high-pressure/temperature service or where corrosive or toxic media are present. The inner rings of style CGI spiral wound gaskets add strength against blowout and act as a compression stop.
Can spiral wound gaskets be reused?
Spiral-wound designs have layers of V-shaped metal and gasket material wound to create a gasket. With proper maintenance, which includes sealer reapplication, these gaskets can be reused.
How does spiral wound gasket works?
How are spiral wound gaskets able to recover?
Spiral wound gaskets have the ability to recover under the action of fluctuating loads caused by process fluid pressure and temperature changes, flange rotation, flange face temperature variations, bolt stress relaxation and creep.
What makes a Metaflex gasket work so well?
The gasket-sealing element consists of a pre-formed metallic winding strip with layers of a softer, more compressible sealing material which, during compression, is densified and flows to fill imperfections in the flange surfaces when the gasket is seated. The metal strip holds the filler giving the gasket mechanical resistance and resilience.
What causes gasket to extrude during side loading?
Under operating conditions this pressure is relieved by internal pressure which acts to separate the flanges. The gasket itself is also subject to a side loading, where the internal fluid pressure can cause the gasket to extrude through the flange clearance space.
Why do metal gaskets hold more pressure than flexible gasket?
The stresses required to seal gases are higher than the minimum stresses necessary for the gasket to conform to the flange surfaces. Metal Gaskets require a greater stress to compress and seal than flexible gaskets. When using flexible non-metallic gaskets, the ability of the joint to hold internal pressure depends on friction.