In a semi-welded plate heat exchanger (SWPHE) where one channel is filled with ammonia, there is a high concentration of ammonia on the inside and a negligible concentration on the outside. This will inevitably cause permeation to some degree. The permeation through metal is zero in all practical senses. But the ring gasket, made of a polymer-based material, will inevitably allow some ammonia
28 rows · The semi-welded plate heat exchangers from Danfoss is designed for ammonia systems Semi-Welding Gasket Plate Heat Exchanger - SRPSemi-Welding Gasket Plate Heat Exchanger. Suitable for Ammonia and Freon System. Can be disassembled or expanded. Can be used in ammonia and refrigerant systems. Can open , cleaning or add plate. Can using PTFE gasket for seal. Punching, Welding, Assembly and Testing of plates 100% made in Taiwan. Suitable for systems using seawater and various chemicals.
May 26, 2019 · Semi Welded Plate Heat Exchanger. Alfa Laval Industrial semi-welded line handles most refrigerants and is particularly suitable for applications involving ammonia. Semi-welded heat exchangers are used in both organic and inorganic chemical processing when the chemicals involved limit the selection of gaskets that can be used or when the required design pressure makes fully gasketed plate-and-frame heat exchangers
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