TM 5-3895-374-24-2FEBRUARY 1993TABLETWO(CONT)BAGHOUSETROUBLESHOOTINGSYMPTOM CAUSE REMEDY4.Dust escaping atLow air volume.See abovesource.Ducts leaking Patch leaks so air doesnot bypass source.Improper hood designClose open areas arounddust source. Check forcross drafts that overcomesuction. Check for dust beingthrown away from hood grindingwheel.5.Dirty discharge atBags leakingReplace bags. Tie off bags andstackreplace at later date(or blockoff) Isolate leaking compartmentif allowable without upsettingsystem.Bag not sealing Check for proper baginstallationFailure of seals in Caulk or weld seamsjoints at clean/dirtyair connection.Insufficient filter cakeAllow more dust to buildup on bags by cleaningless frequently . Use aprecoating of dust on bags.GENERAL.DISCUSSION- Static pressure interpretation.The velocity pressure at any point of measurement is a function of the velocity of the air or gas and its density.The static pressure at a point of measurement in the system is a function of system design (resistance to flow) air densityand the amount of air flowing through the system.The static pressure measured in a "loose" or oversized system will be less than the static pressure in a "tight" orundersized system for the same airflow rate.In most systems, pressure measurements are indicators of how the installation is operating These measurements are theresult of air flow and, as such, are useful indicators in defining system characteristics.Field static pressure measurements rarely correspond with laboratory static pressure measurements unless the fan inletand fan outlet conditions of the installation are exactly the same as the inlet and outlet conditions in the laboratory.page 3-700
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