Technical Data

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Technical Data

Sizing Filter Bag Applications

HOUSING PRESSURE DROP

The graph to the right gives the clean pressure drop through the models 50 & 80 housings with a perforated filter bag basket without a filter bag installed for water, 1 cps @ 68° F.

From the pipe size and flow rate, determine the pressure drop for water

Multiply the value obtained in step 1 by the proper viscosity correction factor from chart to the right.

FILTER BAG PRESSURE DROP

The graphs below give the clean pressure drop through a #2 size bag for water, 1 cps @ 68°F.

To determine the pressure drop caused by the
filter bag, follow these steps:

VISCOSITY CORRECTION
VISCOSITY CPS	CORRECTION FACTOR
50	4.5
100	8.3
200	16.6
400	27.7
800	50.5
1000	56.2
1500	77.2
2000	113.6
4000	161.0
6000	250.0
8000	325.0
10,000	430.0

BAG SIZE CORRECTION
BAG SIZE	DIA. X LENGTH	MULTIPLY BY
1	7.2 X 16	2.25
2	7.2 X 32	1.0
3	4.3 X 8	9.0
4	4.3 X 14	4.5

Step 1	Using the type of bag, micron rating and flow rate, determine the pressure drop for water, 1 cps @ 68°F., for a size #2 bag.
Step 2	Correct for bag size from the Bag Size Correction table at the right if the bag size is different than a #2 size.
Step 3	If the viscosity of the liquid is greater than 1 cps (water @ 68°F.), multiply the result ofrom step 2 by the proper correction factor from the Viscosity Correction table at the right.

The value obtained in Step 3 is the clean pressure frop caused by the filter bag.

Summary

For new application, the clean pressure drop of the system, housing and bag should be 2.0 PSI or less. The lower the value is, the more contaminant a bag will hold. For applications with low dirt loading, this value can go to 3.0 PSI or more. Consult the factory for recommendations when the clean pressure drop of the system exceeds 3.0 PSI.

CONVERSION FACTORS

MESH	MICRON	INCHES
4 8 10	5205 2487 1923	0.2030 0.0970 0.0750
14 18 20	1307 1000 840	0.0510 0.0394 0.0331
25 30 35	710 590 500	0.0280 0.0232 0.0197
40 45 50	520 350 297	0.0165 0.0138 0.0117
60 70 80	250 210 177	0.0098 0.0083 0.0070
100 120 140	149 125 105	0.0059 0.0049 0.0041
170 200 230	88 74 62	0.0035 0.0029 0.0024
270 325 400	53 44 37	0.0021 0.0017 0.0015
550 800 1250	25 15 10	0.0009 0.0006 0.0004
-------	5	0.0002

SUSPENDED SOLID CONVERSION TABLE
PPM	%	TBS./1000 GAL.
10,000 8.000 6,000	1.0000 .8000 .6000	80.0 70.0 50.0
4,000 2,000 1,000	.4000 .2000 .1000	35.0 15.0 9.0
800 600 400	.0800 .0600 .0400	6.5 5.5 3.5
200 100 80	.0200 .0100 0080	1.75 .85 .65
60 40 20	.0060 .0040 .0020	.50 .35 .175
10 8 6	.0010 .0008 .0006	.08 .065 .055
4 2 1	.0004 .0002 .0001	.035 .0175 .0003

VISCOSITY EQUIVALENT
SSU (SAY BOLT SECONDS UNIVERSAL)	CPS. (CENTIPOISE)
30 50 100	1 5 20
200 300 400	40 65 85
500 600 700	105 130 150
800 900 1000	175 195 210
2000 3000 4000	425 625 860
5000 6000 7000	1050 1300 1500
8000 9000 10,000	1700 1960 2150

Cubic Inches	By	To Get
Atmosphere	014.7	PSI
Centimeters	000.384	Inches
Cubic Centimeters	000.061	Inches
Cubic Feet	007.480	Gallons
Cubic Feet	000.173	Cubic Inches
Cubic Feet/Minute	007.48	GPM
Cubic Inches	000.004	Gallons
Cubic Inches	016.387	Cubic cm.
Cubic Inches	000.00058	CubicFeet
Cubic Meters	264.17	Gallons
Cubic Meters	035.31	Cubic Feet
Feet	030.48	Centimeters
Feet	000.3048	Meters
Feet of Water	000.4335	PSI

Multiply	By	To Get
Feet of Water	0000.883	Inches of Hg.
Gallons	0000.883	Imp. Gallons
Gallons	0231.0	Cubic Inches
Gallons	0000.1337	Cubic Feet
Gallons Per Minute	0000.1337	Cubic Feet/min.
Inches	0000.0254	Meters
Kilograms	0002.205	Pounds
Kilograms/Sq. cm.	0014.2233	PSI
Kilograms/Sq. mm.	1422.33	PSI
Liters	0000.264	Gallons
Meters	0003.281	Feet
PSI	0002.31	Feet of Water
PSI	0002.036	Inches of Hg.
Pounds of Water	0000.112	Gallons

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