Membrane Filter Elements
24 Operating Manual Status: 06/2001/01
6.1.2 Determining the closing force for high-pressure membrane filter
elements
High-pressure membrane filter elements are made from special materials. They are
designed for high operating pressures (see type key in the Appendix).
• Membrane filter elements with a centre feed, KMZ .... UM HD bloc, are available for an
admissible squeezing pressure of up to 25 bar.
• Membrane filter elements with a corner feed, KME .... UM HD bloc, are available for an
admissible squeezing pressure of up to 30 bar.
To calculate the required closing force, proceed as described in Section 6.1.1.
Note
However, note that the closing force must be applied in steps. If no individual
specifications are developed by LENSER, the following guidelines apply:
Step Operating pressure
1 up to 50 % x p
max.
2 up to 66 % x p
max.
3 up to 83 % x p
max.
4 up to 100 % x p
max.
• The closing force of the next step must not be applied until the operating pressure
has reached the end pressure of the assigned step.
• To protect the filter elements from damage resulting from excessive closing force,
the closing force must be controlled or monitored so that the closing force assigned
to the respective pressure step is not exceeded.
• When the operating pressure is reduced, the closing force must be reduced
accordingly.
If in doubt, contact LENSER to have the operating parameters defined specifically for
your plant.
