Semi Welded Plate Heat Exchanger Series

by Alfa Laval Mid Europe GmbH

  • This is semi welded plate type industrial heat exchanger.
  • Semi welded plate heat exchanger has RefTight™ sealing system which implies high performance gasket sealing for high-pressure duties.
  • It has flexible and compact design with high heat transfer and high resistance.
  • There are different versions of the product with different pressure and connections. Please refer datasheet for further information.
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Alfa Laval semi welded plate heat exchanger

  • Semi-welded plate heat exchangers are suitable for refrigeration, chemical processes and various kinds of industrial utility duties.
  • The unique Alfa Laval RefTight™ sealing system guarantees a long lifetime sealing between the welded channels because the laser weld is on the outside of the ring gasket groove. The smooth surface ensures a tight uniform seal over the entire gasket ring.
  • The Alfa Laval industrial semi-welded line offers a high-efficiency solution with a sealing function combining gaskets and welds. These units can also withstand a higher design pressure compared to fully gasketed plate-and-frame heat exchangers.
  • The robust Alfa Laval T10-EW, semi-welded plate industrial heat exchanger with the RefTight™ sealing system offers a higher standard of efficiency and durability to meet higher pressure demands.
  • You can order the Alfa Laval Industrial semi-welded line for various temperature programs, pressure drop limitations, media and operating pressures.
  • The various sizes in the product line cover a full range of heat transfer capacities and flows. All are carefully designed and selected to achieve optimal performance.

Semi welded heat exchanger contruction

  • A plate heat exchanger consists of a pack of corrugated metal plates. Each plate is fitted with a rubber gasket, which seals the channel formed between two adjacent plates.
  • In an alternative design, every second gasket is replaced by a laser-weld to allow for fluids aggressive to the gaskets. The plate pack is assembled between a fixed frame plate and a movable pressure plate and compressed by tightening bolts.
  • The frame plate and the pressure plate are suspended from an upper carrying bar and guided by a lower guiding bar, both of which are fixed to a support column.
  • The size of the unit and the material and number of plates are determined by the requirements of the particular application and duty.
  • Each individual plate heat exchanger is optimised for its duty and, as a result, the usage of materials is kept to a minimum.

Key features

  • Efficiency
    • CurveFlow™ distribution area: Improves media flow and minimizes the risk of fouling
    • Offset gasket groove: Ensures plate utilization for maximum heat transfer efficiency
    • OmegaPort™: Noncircular port holes Enhances media flow and thermal efficiency
    • FlexFlow™ plate design: Improves thermal efficiency and optimizes pressure drop utilization
  • Reliability
    • Five-point alignment: Ensures reliable plate positioning and easy service of large units
    • PowerArc™ plate pattern divider: Improves plate rigidity for longer lifetime
    • SteerLock™ plate alignment: Ensures reliable plate positioning and easy service
    • RefTight™ sealing system: High-performance gasket sealing for high-pressure duties
  • Serviceability
    • ClipGrip™ gasket attachment: Ensures perfect seal and trouble-free maintenance
    • Bearing boxes: Guarantees an easy-to-open unit for smoother, more efficient maintenance
    • T-bar roller: Provides a lower unit that is easy to service
    • Compact frame: Facilitates maintenance and minimizes service area requirement


  • Low operating cost possible owing to superior energy efficiency and prolonged service intervals
  • Safe and reliable sealing with no risk of cross-contamination
  • High heat transfer
    • Always turbulent flow
    • Good flow distribution
    • High COP factor achievable
  • Compact
    • Low refrigerant filling
    • Low environmental impact
    • Low weight & space
  • High Resistance
    • Pressure and temperature fatigue resistance
    • Freezing causes no damage
    • Corrosion-resistant plate material
  • Flexible design
    • Add/remove cassettes
    • Openable for cleaning

Application areas

  • Flooded evaporators
  • DX evaporators
  • Cascade systems
  • Liquid-cooled condensers
  • Desuperheater/gas coolers (for e.g. heat recovery)
  • Economizers/subcoolers
  • Oil coolers

Contact us

  • We have the right heat exchanger for you. Fill out the contact us form to contact us today.

Semi welded plate heat exchanger datasheet

Product datasheet

Alfa Laval Industrial Heat Exchanger environmental product declaration

Environmental Product Declaration

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      Alfa Laval Mid Europe GmbH

      Alfa Laval is an international Swedish company active in the areas of energy, marine, and food & water, offering its expertise, products, and service to a wide range of industries in some 100 countries. With our broad portfolio of thermal and separation technologies we provide solutions for enabling the transition to green hydrogen. In electrolyser production (PEM, Alkaline, or SOEC), we offer efficient plate heat exchangers for cooling electrolytes, hydrogen and oxygen. Our plate heat exchanger portfolio also includes desalination technologies that allow you to use seawater or river water in your production, which is ideal if you operate an offshore plant. And our heat transfer solutions make it possible to recover and reuse waste heat from the electrolyser to desalinate water, or for other sustainable purposes, such as district heating. We are present in both production and storage, with unique solutions for compression and cooling, as well as innovative printed circuit heat exchangers for refueling stations. Alfa Laval has spent decades developing highly efficient and robust plate heat exchanger technologies. From our fusion bonding technique that enables reliable performance at very high temperatures, to gas-to-liquid solutions that can handle extremely uneven flow requirements, we can offer unique technologies perfect for fuel cell development.

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