Page 71 - Schroeder - Process Filtration

Bag Elements

Step 1 The graphs show the ∆PB produced Filter Bag
by a #2 size bag for water, 1 cps @ Pressure
77°F (25°C). The pressure drop is
determined from the type of bag, Drop PB
the micron rating and flow rate.

Step 2 Correct for bag size from the table
below if the size is different than
#2 size.
Bag Size Dia X Multiply By
Length
2 7.06 x 32 1.00
9 5.5 x 32 1.50
1 7.06 x 16 2.25
8 5.5 x 21 2.25
7 5.5 x 15 3.00
4 4.15 x 14 4.50
3 4.15 x 8 9.00

Step 3 If the viscosity of the liquid is greater
than 1 cps (water @ 77°F (25°C).
Multiply the result from step 2 by
the proper correction factor from
the chart below.

Viscosity (cps) Correction
Factor
50 4.5
100 8.3
200 16.6
400 27.7
800 50.0
1000 56.2
1500 77.2
2000 113.6
4000 161.0
6000 250.0
8000 325.0
10000 430.0
Bag/Collar/Style Manufacturers
Size Sq. Diameter Length S SS DS P FSI AFF GAF Strainrite Rosedale Commercial The value obtained in step 3, ∆PB is the clean pressure drop caused by the filter bag.
Ft. (in.) (in.)
1 2.5 7.06 16.5 • • • • • • • • • SUMMARY
2 5.0 7.06 32.0 • • • • • • • • •
System Pressure Drop = ∆PS = ∆PH + ∆PB
3 0.8 4.12 8.0 • • • • • •
For new applications, the ∆PS should be 2.0 psi (0.14 bar) or less. For high contaminant
4 1.3 4.12 14.0 • • • • • •
loading applications, this value should be as low as possible. The lower this value is, the more
7 1.3 5.5 15.0 • • • • contaminant a bag will hold. For applications with nominal contaminants, this value can go to 3.0
8 2.0 5.5 21.0 • • • • psi (0.21 bar) or more. Consult factory for specific recommendations when the clean ∆P exceeds
9 3.3 5.5 31.0 • • • • 2.0 psi (0.14 bar).
C1 2.5 7.31 16.5 • •
C2 5.0 7.31 32.5 • •

SCHROEDER INDUSTRIES | PROCESS FILTRATION 71