Alfa Laval Industrial Semi-Welded Line

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Product Details

Alfa Laval Industrial semi-welded plate heat exchangers are designed for duties where standard gaskets are not suitable — particularly ammonia and CO₂ refrigeration, chemical processes with aggressive media, and applications requiring higher design pressures. Welded plate pairs (cassettes) contain the refrigerant or aggressive fluid, while the other side uses conventional gaskets for easy maintenance. The unique RefTight™ sealing system, with the laser weld positioned outside the ring gasket groove, ensures reliable long-term sealing under extreme pressure and temperature cycling.

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▸ Key Features
  • RefTight™ sealing system — laser weld on the outside of the ring gasket groove guarantees long-term sealing between welded cassettes
  • Handles most refrigerants including ammonia (R717) and CO₂ (R744) — proven in over 30 years of industrial refrigeration service
  • Higher design pressure than fully gasketed units — up to 63 barg for demanding refrigeration and chemical duties
  • Excellent resistance to ice formation and fatigue stress from extreme pressure and temperature cycling
  • Welded side contains aggressive media; gasketed side allows easy inspection, cleaning and plate modification
  • CurveFlow™ distribution area minimizes fouling and ensures full use of the heat transfer surface
  • ClipGrip™ glue-free gaskets for simplified maintenance on the service side
  • Lower refrigerant charge compared to shell-and-tube alternatives — reduced cost and environmental impact
▸ Technical Specifications
Parameter Value
Design pressure Vacuum to 63 barg (model dependent)
Design temperature –45 °C to +150 °C
Construction Laser-welded plate cassettes alternating with gasketed channels
Plate materials AISI 304, AISI 316, 254 SMO, Titanium
Gasket materials NBR, HNBR, EPDM, CR, FEPM — selected based on refrigerant and operating conditions
Frame Carbon steel, epoxy painted
Pressure vessel codes PED (CE), ASME, CRN and other national standards
▸ Applications
  • Industrial refrigeration — flooded evaporators, direct expansion evaporators, condensers, chillers, subcoolers
  • Ammonia (R717) and CO₂ (R744) refrigeration systems
  • Heat pump systems — evaporators and condensers with natural refrigerants
  • Chemical processing — sulphuric acid, ethylene oxide, ethylene glycol production
  • Pharmaceutical process cooling
  • Food and beverage cold storage and processing
  • Cascade and heat recovery systems
  • Industrial utility cooling where gasket compatibility with media is limited