Process Designed Internals
The most important part of any
gas filter is the filter element and
its performance in terms of particle
removal efficiency, integrity of seal,
prevention of by-pass, element life and pressure loss. For coarse
filtration down to 45 micron Plenty use
the woven wire mesh, which is tried and
proven
in both liquid and gas service. For finer
filtration down to 1 - 2 micron a different
element construction is needed to give the high required level of
performance.
Plenty Pafic Elements
Plenty, along with many gas filter suppliers
offer a range of paper (or other material)
elements, which provide fine particle removal
by catching debris on the surface of the
element. To increase element life and reduce
pressure drop these are normally pleated
to maximise surface area. Although Plenty supply these
types of elements, they are not suitable
for all applications due to the design of pleated surface media cartridges,
which gives:
- Increased potential for element failure due to bonding of filter media to element ends and core.
- Possibility of dirt being dislodged from the surface of the element
when being removed from the body for
replacement. Any dirt thus dislodged will fall into the body where
it will either speed blocking
of the new element, or more importantly,
fall past the element seat causing contamination sown stream and
damage to the equipment the
filter was intended to protect.
- Element cast is high due to workmanship and the number of stages
involved in manufacture.
In keeping with Plenty's tradition
of innovation design a new type of
gas filter cartridge was developed the
'Pafic' element. In order to guarantee
no dirt by-pass during operation and element
removal a depth type filter media was developed
that is manufactured from a bed of woven
fibres. The gas flows through the bed and
dirt is captured and held throughout the
bed so it cannot be dislodged. As the dirt
is removed throughout the depth of the
cartridge the element has excellent dirt
holding capability and long operating life.
The gas flow is from inside the element
to outside so that any large particles
are captured inside the element and are
this removed with the element when it is
taken out for replacement eliminating possibility of falling into
the body or by-passing the element
seat. Finally the cartridges are one-piece
bonded medias which are installed
in reusable robust steel cages thus eliminating
bonding of different materials and ensuring
low price consumable spares giving
reduced operating costs. British Gas and
U.K. Universities have independently tested
the element design and
the key features
have lead to the Plenty 'Pafic' dry
gas cartridge being adopted as the standard
element within British Gas for many years:
- Depth
Filtration media meaning
- Long element
life
- Dirt is captured and cannot be
dislodged
- Flow from In-to-Out meaning
- Large particles are removed
during cleaning
- No possibility
of dirt by-pass
- One piece bonded
media meaning
- Elimination of potential
breakdown of construction
- Low cost
of operating spares
The feature have also been recognised
by many world wide companies
who are benefiting from installation
of
Plenty
gas filters.
Although Plenty's first choice
if often the depth type 'Pafic'
element,
we
are able to manufacture and supply
pleated cartridges when these
are preferred due to interchangeability
with existing
equipment, duplications of existing
plant or form part of a process
licensees
specification.
For filtration of wet gas the
benefits of depth type media
are also utilised
in Plenty's range of bonded glass
fibre coalescing cartridges.
Depending on the liquid droplets
size required to be removed these
filter
cartridges may be installed in
conjunction with Plenty's high
efficiency vane
pack.
|
