Page 172 - Parker - Process filtration

APPENDIX
Glossary of Filtration Terminology

DEFINITIONS Beta Ratio:
This section presents defi nitions for some key words The ratio of the number of particles of a given size
and phrases that are generally associated with and larger upstream of a fi lter to the number of
fi ltration processes. particles of the same size and larger downstream.

Absolute Rating: Bridging:
Particle size in micrometers removed at a given Condition of fi lter loading where contaminants span
effi ciency under a manufacturer’s defi ned test the open space between adjacent sections of a
condition. Also an arbitrary term assigned by a fi lter medium, thus blocking a portion of the useful
manufacturer. Implied is 100%, but more often fi ltration area.
defi ned as 98.67%, 99%, 99.9% and 99.99%,
according to the manufacturer. Parker Process Bubble Point:
Filtration Division defi nes absolute as 99.98% Pressure drop in inches of water required to expel
removal (Beta = 5000) as determined by particle the fi rst steady (continuous) stream of bubbles (fi zz
counting methods. point) from a horizontal disc of wetted fi lter medium
or a fi lter cartridge immersed in a liquid (usually
Absorb/Absorption: alcohol). Parker Process Filtration Division uses
The process of a fl uid being taken into the pores alcohol in its test.
of a solid.
Bubble Point Test:
Adsorb/Adsorption: A common, nondestructive method used to test the
To collect and hold a fl uid on the surface integrity of cartridge construction to compare relative
of a solid. porosities of fi lter media or to monitor product
consistency as a quality control method.
ASTM Test Procedure (F795-88):
Procedure upon which Parker tests and rates its Bypass:
fi lter media; generally a single pass test in water at Fluid fl owing through a passage other than the fi lter
2.5gpm per 10-in length. medium and /or leakage around fi lter media seals.

“C” Style Bag:
Parker Process Filtration Division style bag which
Beta Ratio & Effi ciency Relationship
incorporates a spring band bag seal confi guration.
Beta Ratio % Effi ciency
Designed to fi t Parker Process Filtration Division
1 0
style housings only.
2 50
4 75
Cartridge/Bag
5 80 Cartridge/Bag Design Flow
Design Flow Rate:
Product Design Flow
10 90 Flow rate at
20 95 which cartridge/ Wound 3.5gpm/10” long
Pleated 2.5gpm/10” long
50 98 bag published
75 98.67 performance ProBond ™ 3.5gpm/10” long
100 99 was generated in MegaBond Plus 2.5gpm/10” long
1,000 99.9 laboratory tests. Standard Bag 50gpm/single length
5,000 99.98 Flow rates above XLH Bag 15gpm/single length
those listed below
10,000 99.99
will adversely affect the effi ciency and dirtholding
∞ 100
capacity of cartridge or bag.

ENGINEERING YOUR SUCCESS.

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