How it works

DuroShell is a plate-and-shell heat exchanger, but one with a groundbreaking internal design. The versatile and compact design offers improved efficiency and durability to maximize uptime, cut costs and increase production capacity.

Revolutionary technology

DuroShell’s laser-welded plate pack is comprised of cut-wing plates, pressed with a patented roller coaster pattern that resists fatigue. Running through the pack are the plate-side distribution tubes, which further increase its strength.
The plates’ roller coaster pattern improves thermal efficiency by maximizing turbulence and minimizing fouling. In addition, the cut-wing plate design creates an open channel on each side of the shell interior. This allows multi-pass arrangements that further benefit efficiency. 

Resistance to fatigue

Unlike conventional plate-and-shell heat exchangers, DuroShell withstands large variations in temperature and pressure. Whereas corrugated plates tend to expand in just one dimension, DuroShell plates expand evenly in all directions thanks to their patented roller coaster pattern. No weak spots arise under stress, which means better resistance to thermal and pressure fatigue.
The entire plate pack is reinforced by the distribution tubes, so vibrations due to compression or phase change are minimized. Moreover, laser welding is used throughout. Lasers create the most accurate weld with the least heat stress on surrounding material, which further improves fatigue resistance.

Optimized flow

DuroShell operates with one media on the plate side and the other on the shell side, both of which can be rated up to the full 100 barg (1450 psig). In a single-pass configuration, the heat exchanger works in pure cross-flow. In a multi-pass arrangement, the flow is equivalent to a global counter-current configuration.
The distribution tubes that extend through the plate pack ensure even distribution of media across the heat transfer surface. Since the nozzles on the shell side are independent from those on the plate side, DuroShell is ideal for asymmetric flow duties.

Alfa Laval DuroShell RollerCoasterRollerCoaster

Robust and efficient performance

A patented plate pattern optimizes thermal efficiency with improved fatigue resistance, flow distribution and mechanical strength. 

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Alfa Laval DuroShell PowerPackPowerPack

Optimized flow distribution and fatigue resistance

Patented design enables improved fluid distribution, mechanical strength and unparalleled fatigue resistance. 

Watch the animation to learn more about DuroShell PowerPack