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Hello guys,

I've been given the task of checking whether the filtration system (filter sock/bag) on our Limestone silo is undersized or not.

Ideally, any information that people can provide in regards to reference texts would be enormously appreciated.

The following is the basic information I have gathered. I'll present it here to help myself brainstorm for a solution.

Tanker pumps at 100 kPa through a 100 mm hose to the Silo. An estimated limestone flow rate was calculated using the load capacity (38 tonne) and the time to unload (2 hrs). This results in 5.27 L/s or 11.17 cfm using an SG of 1 or 1 t/m^3. Average particle size is 35 microns.

Sorry for being so vague with the explanation, but I really don't have much to go on and haven't really been exposed to the design side of Silos before.

I'm assuming that the silo dimensions are 12-ft diameter, a 16 ft straight sidewall height, and a 60 deg conical bottom.

No fan is present on the top of the silo. The only pressure exerted on the limestone is from the truck's blower. An overpressure relief mechanism must also exist then if this is the case.

The bags use a reverse jet system to dump the filtered particles.

The dust collector is a pulse cleaning type that cleans the filter cloth while the exhaust.

Our supplier recommends a unit with a minimum filtration area of 20 m^2. My initial recommendation would be to replace the filter bags (20 m^2) and if there is no noticeable reduction in the filtration effectiveness, then further research into alternate possible filtration methods.

Does 20 m^2 seem undersized based on the figures given?