I recently visited a wet limestone FGD system because the customer called complaining that there were solids building up in the bottom of their limestone slurry storage tank.  I arrived at the site and went to look at the agitator (not a Philly) to try to get a handle on the problem.  The agitator drive was running smoothly, quiet and cool.   There was no apparent mechanical problem on the top side of the system.

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