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Welcome to Alfa Laval Welded Heat Exchangers Help Center
What is a gasket protection sheet or outer seal?
A gasket protection sheet is a metallic thin sheet fixed on the gasket. It is used in some specific cases, when opening the unit, you may detect its presence. It is used for avoiding the direct contract between gasket and fluid and/or preventing any damage of the gasket that may appear when tightening the cover. An outer seal is generally for high pressure Spiral heat exchanger.
See the user manual alfa-laval-spiral-instruction-manual-en.pdf for more details.