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The Alfa Laval Diabon® plate-and-frame heat exchangers are used for tough corrosive media. This range of heat exchangers combine Alfa Laval’s know-how in heat transfer with Germany based SGL Carbon’s expertise in graphite process equipment. Alfa Laval Diabon® gasketed plate-and-frame heat exchanger combines high efficiency heat transfer benefits with the exceptional corrosion resistance of graphite material.


Heaters, coolers, interchangers, condensers and evaporators for corrosive media, especially in the treatment of:

  • Hydrochloric acid (HCl)
  • Sulfuric acid (H2SO4)
  • Hydrofluoric acid (HF)
  • Mixed Acids (HNO3/HF)
  • Phosphoric acid (H3PO4/P2O5)
  • Other organic and inorganic media


Standard design

The graphite plate heat exchanger consists of a pack of corrugated graphite plates with portholes for the passage of the two fluids between which heat transfer will take place. The plate pack is assembled between a carbon steel fixed frame plate and movable pressure plate and compressed by tightening bolts. The difference in coefficients of expansion of carbon steel and graphite is compensated for by means of helical springs.

The plates are fitted with a film type PTFE gasket of 0,2 mm thickness after tightening, which seals the interplate channel and directs the fluids into alternate channels. The number of plates is determined by the flow rate, pressure drop and temperature program. The plate corrugations promote fluid turbulence and minimize fouling. The frame plate and pressure plates are suspended from an upper carrying bar and located by a lower guiding bar, both of which are fixed to a support column. Connections are located in the frame plate or, if either or both fluids make more than a single pass within the unit, in the frame and pressure plates. The frame and pressure plates are protected from the corrosive media by means of a PTFE lining.


Typical capacities

Max flow rate of 250 m3/h, depending on media, permitted pressure drop and temperature program.


Technical data