Performance, Precision, Partnership

Membrane Dryers

Innovative, compact dryers for superior efficiency and reliability

The HPC KAESER Membrane Module (KMM) features a special flow concept for long-term drying efficiency as well as the innovative, high-density helical fibre structure of the high-performance hollow fibre membranes.

KMM Series dryers easily deliver pressure dew points in the minus range, even when installed where space is at a premium. They also play to their strengths when energy sources are unavailable or when used as end-point dryers in areas at risk of frost.

  • Flow rates from 0.04 to 3.97 m³/min
  • Pressure dew point from +10°C to −40°C (relative temperature reduction of up to 90°C compared to inlet air temperature)
  • Optional versions with energy-saving purge air stop valve


  • Superior membrane design:
    The helical structure of the extra-fine HPC KAESER membrane fibres results in a high-surface area separator with low space requirements. Furthermore, effective transportation of water molecules from the outside in means the external membrane pores always remain ready to channel more water (innovative flow concept)
  • Maximum operational reliability:
    All functional parts of the KMM Series dryer are housed within a stable enclosure. Upstream HPC KAESER micro filters provide reliable protection to membrane modules against the harmful effects of dirt, aerosols and oil
  • Highly efficient:
    Air loss is minimised thanks to purge air nozzles featuring a defined aperture diameter. During downtimes, the (optional) purge air stop valve significantly augments the cost-effectiveness of the dryer

Product Details:

Super-fine membrane fibres:
Compared to conventional membrane fibre dryers, the fibres in the HPC KAESER membrane module are significantly finer and more numerous, thereby increasing their surface area. In turn, this delivers superior drying performance compared to conventional designs. This is augmented yet further due to the high mechanical stability of the membrane fibres.

Flow concept:
The hollow membrane fibres consist of a highly porous support layer and an internal, water-permeable separation layer. The pressure differential between the moist compressed air outside the fibre and the almost atmospheric flow of purge air through the centre encourages water molecules to permeate through the fibre wall. The pores of the support layer therefore always remain permeable.

Efficient drying:
The spiral helical structure of the fibres in the inner chamber of the dryer module means that the module is now shorter, yet has the same drying capacity as previous, longer models – whilst nevertheless boasting a greater active membrane surface area per unit of volume. The helical fibre structure also promotes even distribution of air around the fibres and encourages the movement of water molecules.