Alfa Laval Compabloc range is compact and designed for optimum performance and serviceability across a broad spectrum of industrial process applications. Standard pressure range up to 42 bar.

Alfa Laval Compabloc welded plate heat exchanger

The Alfa Laval Compabloc is a breakthrough plate heat exchanger design that combines a whole range of technological advantages into one compact unit. The all-welded plate pack does away with all gaskets between plates, and makes it possible to operate with a wide range of aggressive media and at high temperatures and pressures.

Corrugated plate patterns generate high turbulence that results in overall heat transfer coefficients three to five times greater than a shell-and-tube heat exchanger. In addition to minimizing fouling, this makes it financially viable to use corrosion-resistant exotic metals.

This makes the Compabloc perfect for heat recovery in corrosive operating environments and for handling aggressive, high-temperature fluids of all kinds. The compactness of this all-welded unit means it can be installed virtually anywhere – as a condenser or reboiler for distillation and stripping columns, as a condenser on top of reactors and in a wide range of other heat exchanger applications.

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Compabloc - Exploded view

The Compabloc heat exchanger is built around a pack of corrugated heat transfer plates, welded alternately to form channels. The complete plate pack slides inside a four-column carbon steel frame bolted to pressure-retaining heads at the top and bottom. Four removable side panels contain the fluid inlet and outlet connections, and baffles direct the fluid media back and forth through the channels.


The corrugated plate pattern in the Compabloc creates an exceptionally high degree of turbulence. This results in outstanding heat transfer efficiency, with an overall heat transfer coefficient  two to four times greater than that available from a corresponding shell-and-tube unit. This means a Compabloc requires only 25–50% of the heat transfer area  to provide the same effect as a corresponding tubular unit.

When the Compabloc is used as a condenser, the vapour enters from the top of the unit and condenses on the cold plates while passing through the plate pack. The condensate exits at the bottom. The cooling media is forced through several passes with a series of baffles. This, together with the plate corrugations, boosts heat transfer efficiency and keeps fouling to a minimum.

If the vapour contains non-condensable gases, a two-pass arrangement on the condensing side permits gas/liquid separation inside the Compabloc, eliminating any need for a special separator unit. The main condensation takes place in the first pass. Sub-cooling of the non-condensable gases takes place in the second pass, which also serves as a mist eliminator.

With its short flow path and large cross-section, the Compabloc is a perfect thermosiphon reboiler. The feed enters at the bottom of the unit. When the liquid passes between the heated plates, it is brought to boiling point and a mixture of vapour and liquid leaves the unit through the outlet at the top.