Chemical Engineering March 2022 - 45

cloth. In the case of the woven wire
mesh, the drainage member is usually
a more open coarse-square
mesh, such as 8 × 8 mesh. Figure
13 shows a metal filter leaf with the
honeycomb support and the synthetic
cloth cover open to show
the support. Figure 14 shows a
five-ply filter-leaf construction with
drainage mesh.
FIGURE 13. This metal filter leaf is equipped with
a honeycomb-style drainage support, which helps
to increase flow through the filtration elements
FIGURE 14. Drainage mesh on filter leaves can
help separate the cloth from the metal support
Filter-cloth covers
While filter-cloth covers are sewn
when originally installed onto the
filter leaves, replacement filter-cloth
covers may be supplied with either
Velcro closures or zippers to facilitate
field installation and eliminate
the need to be sewn, which may
require sending the filter leaves to
a shop for sewing. Care must always
be taken to prevent dragging
filter leaves with cloth covers on
them across the floor. This will tear
or rip the cloth. Also, users must
be careful not to hit the covered
leaves against sharp surfaces that
might damage the cloths. The cloths
should be inspected periodically for
any wear, tears or holes in the cloths.
Such damage will most certainly affect
the filter's performance. A good
preventative measure is to supply
the cloth covers with reinforcement
patches either on the corners, or
any areas where the bags may be
subject to friction or wear.
■
Edited by Mary Page Bailey
Acknowledgements
The author acknowledges the valuable contribution
toward writing this article of Sefar Americas Inc. (Buffalo,
N.Y.) and Filter-All, Inc./Sewn Weld Industries Inc.
(Magnolia, Tex.)
Author
Jose M. Sentmanat is the president
of Liquid Filtration Specialist,
LLC (P.O. Box 1064, Conroe, TX
77305-1064; Website; www.
filterconsultant.com; Email: info@
filterconsultant.com; Phone: 936756-5362).
Sentmanat has over
50 years of experience in application
engineering, sizing and selection
of filtration equipment for a
multitude of process-related industries in the food-andbeverage,
pharmaceutical, consumer, chemical and
petrochemical sectors. Sentmanat has authored several
publications, references and operations manuals, and
has
given
numerous
courses worldwide.
seminars
and
short
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MARCH 2022
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