Spiral Wound Gasket - Style ‘GOI’:

The Style GOI has both Solid Internal & External ring. The inner ring prevents inward distortion of the Spiral wound element and prevents accumulation of solids, reduce turbulent flow of process fluids and minimise erosion of flange faces. Outer accurately centres gasket on flange faces.
Suitable for use with flat face and raised face flanges and specified for high pressure / temperature services and or where corrosive or toxic media are present.
ASME B16.20, which covers spiral wound gaskets, requires the use of solid metal inner rings in:

• Pressure Class 900, nominal pipe sizes 24” and larger
• Pressure Class 1500, nominal pipe sizes 12” and larger
• Pressure Class 2500, nominal pipe sizes 4” and larger
• All PTFE filled gaskets.

It is highly recommended the use of inner rings in following applications:

• Vacuum service or suction side of rotary equipment such as pumps and compressors
• Aggressive media, high pressure or temperature
• Surface finishes smoother than 125 Ra
• If over compression of the gasket is a concern.