Spiral Wound Metallic Gaskets

Description

SPIRAL WOUND GASKET
• The spiral wound gasket is suitable for use across a wide pressure range and is therefore virtually applicable.
• The spiral wound gasket can be used to seal fluid pressures up to 250 bar and cryogenic temperatures as low – 200°C and up to elevated temperatures 550°C.
• Due to its sturdy design the spiral wound gasket is simple to install without causing damage (although extra care should be taken during transportation and installation of large diameter gasket without guide rings).
• The outer guide ring serves to locate the spiral element centrally on the flange faces and prevent blow-out.
• By combining different winding materials and metals the gasket can be tailored to a wide variety of operating conditions.
• Due to its non-adhesive character the gasket is easy to remove after service.
• The gasket does not cause damage to the flange faces.

BENEFITS OF THE CENTRING RING
The spiral wound gasket outer centering ring provides the following benefits:
◼ Optimum location between the bolts.
◼ Protection of the spiral wound element.
◼ Additional security against gasket blow-out.
◼ Acts as compression limiter preventing overloading and over compression of the spiral wound element.
◼ Prevents radial-flow of soft fillers, such as P.T.F.E. For these reasons it is preferable to use spiral wound gasket with outer centering rings. On the outer ring is marked with nominal size, pressure class, standard and materials.

BENEFITS OF THE INNER RING
The spiral gasket inner ring provides the following benefits:
◼ Prevents radial-flow of soft fillers, such as P.T.F.E.
◼ Reduces turbulence-minimizing flow resistance and crevice corrosion.
◼ Acts as a heat shield when the spiral wound gasket is subjected to high temperatures. Inner and outer rings are particularly recommended for use on spiral wound gaskets exceeding class 600lbs, but specifically recommended for high temperatures and pressures to optimize the operational reliability of the spiral wound sealing element.

MATERIAL SELECTION
Material selected for the inner ring and winding metal is usually the same as the flange metal, in order to prevent corrosion and differential expansion problems. The outer centering ring is generally manufactured from carbon steel with an anti- corrosion treatment; however, the ring may also be manufactured in the same metal as the flange to prevent corrosion problems.