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Semi-Welded Modular Heat Exchangers

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SIGMADUAL semi-welded heat exchangers are made up of the plates welded by using the advanced laser welding techniques. Two plates are welded together, NBR, EPDM,Viton® and Teflon® seals may be attached. The package of plates produced can repair other plates while preserving the integrity of the welded plate couple.


Benefits

  • Gasketed side can be inspected and cleaned as normal gasketed PHE plates
  • Sealing length with gasket reduced to 20% (ring gasket)
  • Risk of leakage reduced by 95%
  • High flexibility due to exchangeable modules. Extensions of PHEs can be done easily.
  • Existing gasketed PHEs can be redesigned to semi-welded
  • No spare parts on welded side needed
  • faster ROI
  • Investments lower compared to gasketed PHEs FKM / PTFE

Specification

Laser welded modules

Plate sizes

  • DN 100 (4“); DN 200 (8“); DN 250 (14“)

Plate materials

  • 304, 316L, 904, Nickel-alloys
  • Others on request

Gasket materials

  • NBR, EPDM, FKM
  • Chloroprene
  • PTFE-coated (ring-gasket)

Typical applications

Refrigerant evaporator
Evaporation of refrigerant on the welded side in order to cool the media on the gasketed side.

Evaporation of heat transfer fluid in geothermal power plants
Evaporation of ammonia on welded side with the heat from geothermal water on the gasketed side.

Economical alternative to FKM / PTFE-PHEs
Only FKM / PTFE-O-rings needed.
High security due to reduced gasket-length by 90%.