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When choosing a sealing solution, both already installed and specified flanges must be carefully evaluated. The challenge is to select a seal with the right design and materials to minimize the potential for galvanic corrosion. Some standards, such as NORSOK, prohibit the use of graphite in sealing materials for offshore applications. Graphite is more noble than almost any metal, so any metal that comes in contact with it acts as an anode and therefore begins to corrode. This adds to the challenge, as many applications prone to flange surface corrosion must also meet fire safety requirements. Translated with DeepL.com (free version)
The issues surrounding graphite have led to an increasing demand for sealing materials that are fireproof, do not cause galvanic corrosion and still ensure a reliable seal. Some operators are opting for mica-based materials to overcome this problem. Mica is fire-safe and relatively inert, but it does not provide an optimal seal. Vermiculite-based products, such as Corriculite® and Thermiculite®, do offer effective corrosion protection, are fire-safe and provide a reliable, tight seal.
When the flange surface is corroded and cannot be removed for repair, Flexitallic offers a special solution: the Flange Rescue Gasket. This gasket prevents further corrosion and allows the plant to continue to operate safely until scheduled maintenance can take place. For applications with heavy loads and temperature changes, Flexitallic has also developed the Change-CR gasket. This combines corrosion protection with a reliable and dynamic seal.
