Membrane Filter Elements
Status: 06/2001/01 Operating Manual 11
5 Assembly and Commissioning
5.1 Installing the filter cloths
Selecting the filter cloths
A wide range of prefabricated filter cloths can be used:
• overhanging cloths with cloth grommets
• barrel neck cloths with or without edge sealing
• barrel neck cloths with or without support cloth or undercloth
• barrel neck cloths for fixing in a cloth clamping groove in gasketed membrane filter
elements
Cutting the filter cloths to size
Cut the filter cloths to match the following boreholes:
• filtrate drainage holes
• wash-water feed holes
• discharge holes
• internal inflation ports for squeeze medium
Information
For membrane filter elements of smaller dimensions and elements for side bar filter
presses up to 1000 mm in size, we recommend that you install the filter cloths before
installing the filter elements in the filter press.
Note
When cutting the filter cloths to fit, make sure that these cut-outs are approximately
10 mm larger in diameter than the holes in the membrane filter elements.
Experience shows that when the filter cloths stretch, these openings can be obstructed
by filter cloth cut-outs not being large enough.
Information
• Always stretch the filter cloths flat on the filter element.
Folded or off-centre filter cloths lead to leakage in the filter chamber.
• Make sure that the filter cloths are not pressed into the filtrate drainage holes, even
after extended use.
• Depending on the cloth quality, increased wear must be expected at points
subjected to particularly high stress. Your cloth supplier offers filter cloths equipped
accordingly for your application.
• Make sure that the barrel neck cloths fit tightly to the border of the slurry canal.
• The so-called "neck" may not protrude into the filter chamber.
• If the suspension is very easy to filter, arrange the cloth neck in such a way that the
slurry canal does not become blocked. Otherwise considerable differential pressures
will result, causing damage to the filter elements.
