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November 15, 2007
My name is Anil Shah, we are suppliers of Ultra
Filtration Systems required for the E COAT Process in
Automobile Industry. We face a typical problem with UF
systems. They run well for the first year or two with
excellent permeate flux stability, and also recovery of flux
on system cleaning. However, subsequently permeate flux
stability and recovery is a problem even with newly
installed membranes.
I assume that this is possibly because the paint bath and
its chemistry are good for the first year or so due to low
production volumes, however, subsequently the chemistry is
getting disturbed and is adverse to UF system
operation.
The customer usually refers to the system supplier -
however, we have limited understanding of paint chemistry. I
will appreciate if some generic guidelines can be provided
for testing of paint chemistry parameters which affect UF
system performance.
ANIL Y. SHAH
Supplier - E Coat UF Systems - Mumbai, Maharashtra,
INDIA
November 29, 2007
The answer, my friend is swirling in the tank!
If the quality of coating is perfect, the chemistry of the
Ecoat tank is in perfect health. If the customer has severe
coating problems, your UF membrane could be affected. Just
walk around the shop floor and see the final coating
quality. You will know whether it is safe to put in the new
membrane or not.
UF membranes are certainly affected by ionic contamination.
But in that case the coating is already being affected and
there can also be generation of sludge in the tank.
Check if regular tests are being carried out on the tank.
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