At Hall Pyke we are Irish suppliers of filtration materials. Here are some tips on what you need to know about Vent Filtration Dynamics.

We received filters back for testing and upon initial examination it was clear that they wouldn’t be passing any integrity test. See pic.1 and 2 below.
Pic.1

The filters were used as sterile vents on a hot water process tank, it’s clear from the images that the process itself didn’t cause this damage. The hardware, outer / inner cage, and end caps have melted due to extreme heat. The hardware is made from polypropylene which has a melting point of 160degC.

We tested a similar filter in the lab oven for 10 mins at 250degC, see Pic.3 below, so its clear that the temp was between 160 and 250degC.

So, what can cause a filter failure like this?
Heating jacket failure, the controller has possibly failed and the heating jacket has taken the jacket above the 160degC limit of the filter hardware. Positioning of the filter housing. In vent applications the housing must always be in the vertical. On hot water tanks steam vapour can pool in a housing that is positioned on the horizontal. This can cause failure of the jacket controller as it struggles to maintain temperature, failure of the controller results in the jacket overheating the filter housing.

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