Type SGIR spiral wound gaskets (also known as style CGI) supplied by AMG Sealing are premium semi-metallic sealing solutions engineered for high-pressure, high-temperature, and arduous industrial applications. Featuring a V-shaped metallic winding strip interleaved with soft filler material, Type SGIR gaskets incorporate both a solid metal
outer guide ring
and a solid metal
inner retaining ring
to provide the highest level of sealing integrity and blowout protection available.
By combining different winding materials and metals, spiral wound gaskets can be tailored to suit a wide variety of operating conditions and are able to seal fluid pressures
up to 400 bar
and from
cryogenic temperatures up to 1000°C.
Applications
Type SGIR gaskets are the preferred choice for standard
raised-face (RF) flange
configurations across the entire spectrum of pipeline pressure classes. They are widely used in demanding environments exposed to severe pressure spikes, thermal cycling, and high vibrations, including oil refineries, petrochemical processing plants, offshore platforms, power generation stations, and high-pressure steam pipelines.
Gasket Construction & Component Functions
-
Outer Guide/Centring Ring:
Accurately centres the gasket within the flange bolt circle, acts as a built-in compression stop to prevent over-tightening, and provides additional blowout resistance.
-
V-Shaped Sealing Element:
Manufactured by alternating layers of preformed metallic strip and soft filler (such as flexible graphite or PTFE), providing spring-like recovery under fluctuating loads.
-
Inner Retaining Ring:
Crucial for preventing inward buckling of the sealing element under high bolt loads, shields the windings from thermal degradation, reduces process media turbulence, and protects against flange face erosion.
Availability and Options
AMG Sealing supplies SGIR spiral wound gaskets in a wide range of standard dimensions conforming to
ASME B16.20,
EN 1514-2, and
EN 12560-2
specifications. Standard material configurations feature a carbon steel outer ring, 316L stainless steel inner ring and windings, and flexible graphite filler.
For sizes and material options, please see the technical data sheet below.