Plastic bag filter housings are typically used for applications requiring the removal of fine particles, in the 1 to
200 micron nominal range. We offer plastic bag filter housings which are compatible with
industry standard #1 and #2 size filter bags which have a 7” diameter opening
and a filter bag length of 16" (#1) or 32" (#2).
We also offer
adapters enabling you to use filter cartridges in lieu
of filter bags for finer retentions.
Although filter bags are available with coarse
retentions (up to 800 microns), it is more common to use
pipeline strainers for retention of particles >200
microns using a perforated or mesh lined basket unless
the volume of solids to remove necessitates a larger
open area straining ratio afforded by a bag filter
housing.
The Platinum Glass-Filled Polypropylene (GFPP) model is
a one-piece molded vessel having numerous locations for
true-union connections; these connections can also be
made from GFPP, PVC or CPVC. The sizes
(from 1¼" to 4") and the connection types
(FNPT/threaded, flanged and socket) are available in all
materials. "Glass Filled" polypropylene contain
glass fibers which increases stiffness and surface
hardness, thus supporting use at higher pressures and
temperatures when compared to "regular" polypropylene.
The PVC and CPVC bag filter housings consist of a common upper and
lower half, with a "spacer pipe" inserted between these
two pieces to form the "body", thus a longer pipe
is used for the #2 size and a shorter one for the #1
size; the end connection material matches the body
material.
Similar to the Hayward SB/DB styles of
plastic
pipeline strainers, the FLV has a
thoughtful, user-friendly design. The "rabbit
ear" style chamber cover enables quick removal and
access to the filter bag without requiring tools and
reduces the potential for over tightening. The
filter vessel body has buttress style threads for the
chamber cover provide a downwards oriented failure path,
so in the event of over-pressurization the failure mode
should be predictable and protect other system
components from damage. The chamber cover also has a
conical shaped displacement geometry which serves two
purposes, it reduces the volume of the chamber when
accessing the filter bags and helps seal the filter bag
in-place via downwards pressure onto the filter bag
sealing ring. The included vent port valve is easily
opened to bleed air from the system during filling and
it si protected from damage by the filter chamber cover
handles.
Whether GFPP, PVC or CPVC, the body has two inlet ports
and two outlet ports to provide flexibility for
installation. Thus these filter bag vessels can be installed inline
(inlet and outlet are 180° apart - directly opposite
of each other with high port the inlet and the low one
the outlet) or "loop" using the upper and lower ports
on the same side of the vessel. As an example, the
"loop" configuration is useful if installed in a
corner. GFPP material has additional ports at 90°,
adding another potential inlet/outlet flow path.
Unused ports are capped-off with blank true-union
connections.
The true-union connection design simplifies installation
as well as enabling filter housing replacement without cutting
and replacing piping; perhaps especially useful for
socket glued piping connections.
There is a restrainer basket within the filter bag
housing whose purpose is to support the filter bag,
without support clogged filter bags might rip apart due
to the weight of retained material. The o-ring seal
ensures no fluid bypasses the filter bag. There are two
configurations for the restrainer basket, one is simply
a cylindrical basket and the other has a "clamshell"
design, enabling the user to split the basket open,
which is helpful removing very full filter bags and for
installing new bags, especially the #2 size which are a
little longer than most arms and insertion can be done
without placing your hand/arm into the vessel which
might contain an aggressive process fluid. The
restrainer baskets are made from the same material as
the housing and can also be provided in 316SS for higher
differential pressure applications characteristic of
viscous fluids and high percentages of solids.
The only elastomers used are captured o-rings for the
chamber cover, restrainer basket, true-union connections and o-rings for
the vent valve; the o-ring materials are
either
EPDM or
FKM.
Other significant aspects to consider include:
The maximum flow rate per housing is 100 GPM for single length (#1 size) and 150 GPM for double length (#2 size).
Your piping system should be independently supported; the filter housing is not designed to support piping nor should piping support the filter housing. The filter housing should be mounted to a firm surface and the piping upstream and downstream of the strainer should be independently supported.
It is critical to review your pressure limitations for your fluid temperature and reduce the potential for a Water Hammer situation accordingly.
When in-doubt, simply call us or better yet, fill-out our application based inquiry form and we'll assist you with the proper selection.