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Alfa Laval Merco 32 Capacity Booster

Upgrading to increase capacity up to 50 %

Increased demand for ethanol and high fructose corn syrup has renewed interest in new processing strategies and equipment to improve efficiency and overall process economics.

To improve separation performance, Alfa Laval introduces the Merco 32 Capacity Booster upgrade. This is a straightforward modification of your Merco H-30 separator at a minimal capital cost, rather than purchasing a new separator. The installation costs will be at a minimum level. Yet it brings you the benefits of both increased flow capacity or better separation erformance and reduced energy consumption per unit.

  • Increased capacity of up to 50 %
  • Energy savings up to 25 %
  • Longer service life
  • Easier to inspect and service
  • Rotor assembly flexibility for PS and GT/MST/CL application

Increase capacity

Simply replace your Alfa Laval Merco H-30 rotor assembly and feed inlet assembly with a new AlfaLaval Merco 32 rotor assembly and feed inlet-assembly.

In addition to enhancing capacity, the Capacity Booster Upgrade includes the new E-25 high efficiency nozzles with a special tool that makes the nozzles much easier to install and remove. The nozzles are made from one piece of abrasion resistant material that results in extended nozzle life. The nozzles are also installed in bushings which minimize the risk of damage to the rotor bowl wall.

Easier to save energy

Save energy whenever the additional capacity isn’t required. You have the flexibility to increase feed intake during peak production periods and reduce it as production slows. When operating at reduced production capacity, you can realize energy savings up to 25%.

Easier to inspect and maintain

Does inspecting and cleaning your disc stack take too much time? Then you’ll love two of the most useful features of the new rotor assembly. A new lock ring cuts the time required to remove the bowl cover for routine inspection. And a new design gives you fast access to the return tubes for inspection.

Rather than spending time and energy to remove individual discs manually, simply lift the feedwell to remove the entire disc stack assembly at once. The majority of the rotor parts are common and can be easily adapted for all applications and the cost of the spares are significantly reduced. Hydraulic hoist cylinder assembly design for simplified maintenance.


Double underflow volute upgrade for additional energy savings at higher nozzle flow.

Operating principle

The feed, consisting of both liquid and solids, is led into the rotating centrifuge bowl from the top via a stationary inlet (1). It is then accelerated in a distributor (2), before entering the disc stack (3). The actual separation process takes place between the discs, with the liquid phase moving through the disc stack towards the center of the bowl. When it has reached the center, it is then discharged over a power ring (4). The solids, which are heavier, collect at the periphery of the bowl, and are then continuously discharged through the nozzles (5). Part of the concentrated solids discharged through these nozzles can be recirculated into the bowl periphery through the return tubes (6), via the return chamber (7). The wash water used to free solubles and other impurities from the solids can also be recirculated to the periphery of the bowl the same way. The bowl is mounted on a vertical lower shaft (8) that is driven via belts by a vertically mounted motor.

Utilities consumption

Electric power max. 160 kW
Safety water max. 120 m3 /h (530 US gpm)
Wash water max.50 m3 /h (220 US gpm)

Material data

Rotor s.s. 1.4462 UNS S 31803
Rotor housing Cast s.s. ASTM A-743 / 316 s.s
Machine base, column and radial arm Cast Iron
Gaskets and O-rings Nitrile rubber

Technical specification

Throughput capacity max. 170 m3 /h (750 US gpm)
Nozzle flow max. 110 m3 /h (480 US gpm)
Bowl liquid volume 125/133 litre (GT/MST/CL / PS)
Bowl speed max. 3337 rpm
Motor power installed 110/132/160 kW (150/180/215 HP)
Feed temperature range 0–65°C