Instructions / Assembly

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:7ROHDUQWKHEDFNJURXQGLQWRZKDWLVWREHDFFRPSOLVKHG
6. Operation:7RREWDLQDGGLWLRQDOEDFNJURXQGLQIRUPDWLRQ
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 Specic 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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