Industrial Products-Liquid Filtration0 pages

copyright 2006
www.facetinternational.com
Definition
Liquid filtration is the removal of solids from liquids
by flowing the contaminated liquid through a filter
media that will retain the solids and allow only clean
product to pass through.
Filtration Function
Using a surface filter medium to remove a volume
of solids from a liquid requires that the medium
should contain uniform pores smaller than the
smallest particle to be removed. It should also be
strong enough and possess sufficient area to hold
the required volume of solids.
If a depth-type medium is used, the medium must
contain an infinite number of small, irregular,
continuous passages which give the solids a
tortuous path to travel through. A depth medium of
proper density will stop essentially all solids above
a specified size.
The medium selected must withstand the
manufacturer’s required maximum allowable
pressure drop and provide a margin of safety
to cover both inadequate maintenance and line
pressure surges commonly found in systems as
a result of stops and starts. Facet uses both types
of media in its product range.
General Applications
• Removing solids that may damage the aesthetic
appearance of a product.
Example: Solids in paint, bleach, liquid
soaps, vinegar, plastic resin for use in
plastic extrusion products.
• Removing solids which could affect chemical
reaction of a product.
Example: Catalyst fine in a refining process.
• Removing solids that could damage operating
equipment.
Example: Abrasive contaminant in hydraulic
and lubricating oils.
• Removing solids that could affect a finished
production item.
Example: Contaminant in grinding and
cutting oil of production equipment.
• Removing solids that could in some way affect
the health of operating personnel.
Example: Radioactive waste in primary
coolant system on boiling water reactors
and clean-up water in water reactor system.
Proper Selection Of Filters
Selection of media and vessel design determine
the filter flow rate, dirt holding capacity, particle-size
removal in one pass, overall cost of operation and
initial investment.
Replaceable cartridge-type filters have wide
usage and can be used in most any application.
The two most important factors to consider when
determining whether to use a replaceable cartridgetype
filters are the concentration of the solids to be
retained by the filter and the required degree of
filtration.
Cost Of Filtration
One realistic method of determining the “true cost”
of filtration is the cost per pound of solids removed
from a liquid. The four factors that make up this “true
cost” are:
1. Cost of media (cartridges)
2. Cost of service parts (gaskets, etc.)
3. Cost of maintenance labor
4. Cost of downtime to service or maintain
(value of lost production)
By totaling these four factors, determine a unit base
as cost per pound, per gallon, per barrel, per year,
etc. Although the cost of new equipment may vary,
the “true cost” to the user is based on a cost per
pound of solids removed. However, the achievement
of a specific standard of quality cannot be measured
by cost alone and this is the true value of a filter.
Capabilities
Today, more than ever, quality-conscious customers
expect, and efficient plant operations dictate, the
removal of solid contaminants from liquid products
or processes. Filtration of particles too small for the
eye to detect is essential to protect and improve
quality, assure customer acceptance, prevent
malfunctioning of equipment and reduce wear on
machinery.
Facet filtration equipment has been designed for
easy maintenance. The many easy service features
reduce downtime and labor cost in maintaining
equipment. These costs are important in evaluating
both initial and future operational expenses.
With nearly 60 years of constant research, product
development and quality controlled production,
Facet offers you maximum dependability, quality,
innovative engineering and service.
Liquid Filtration
General Description
I-101
Facet I-1 Rev 04-2006.indd 1 2/14/2007 5:07:43 PM