Bag Selection Guide
57
FILTER BAGS
CORRECTION CHART
VISCOSITY IN CPS. CORRECTION FACTOR
100 8.3
200 16.6
27.7
800
1000
2000 113.6
161.0
6000
8000
Pressure Drop per Square Feet of Surface Media
Flow Rate (GPM of water, 1 cps @ 77° F)
0
.2
.4
.6
.8
20 40 60 80 100 120 140
2
5
0
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SIZING A LIQUID FILTER BAG
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A. BASIC INFORMATION REQUIRED: Provides the minimum amount of information for sizing a filter bag based strictly
upon flow rates with no regard to contaminant loading. Hence, if sized on flow rate alone, frequent change-out could
be required.
B. SPECIFIC INFORMATION REQUIRED: Provides for information to size a filter bag based upon the flow rates and the
dirt/contaminant loading. All of this information should be met if at all possible.
A. WHY Basic Information is Required:
1. Medium: To properly choose the correct media for chemical compatibility.
2. Flow Rate: To properly choose the correct filter bag size.
3. Temperature: To properly choose the correct media for temperature range.
4. Viscosity: To configure the pressure drop/delta p across the filter bag. The higher the viscosity, the greater
the delta p. This means, a larger size filter bag or a multiple number of filter bags may be required.
5. Application:7ROHDUQWKHEDFNJURXQGLQWRZKDWLVWREHDFFRPSOLVKHG
6. Operation:7RREWDLQDGGLWLRQDOEDFNJURXQGLQIRUPDWLRQ
7. Types of Pump: To learn pumping characteristics which are detrimental to filtration efficiencies. As
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pumps have pulsating flows.
8. Location of Bag Housing to Pump: To determine the size of the filter bag as pumps can only tolerate a
certain delta p on their suction side or the pump will cavitate.
B. WHY Specic Information is Required:
1. Particle Type: To determine if the dirt/particulate is detrimental to the filter media.
2. Particle Physical Properties: To determine if the contaminant, will “plug up”, i.e., blind off the filter due to
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3. Particle Size To Be Removed: To determine the filter bag micron rating.
4. Particle Size Range: To determine if there is a broad or narrow range of particle sizes in the liquid to
determine if single or multiple filtration stages are required.
5. Particle Loading: To determine how many filter bags are to be required for the removal of dirt/particulate
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6. Distribution Of Particles By Weight: To “fine tune” the application and relates to item “4” above as single
or multiple stages.
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filtration media. Divide the differential pressure by
the number of square feet of media that is found in
the selected bag to get your final rating.
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your liquid is above 1, use the correction factor to
determine your estimated pressure drop.
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