GB
3
The ultimate filtration & drying technology
Stainless Steel High Pressure Filters, 50, 100 & 350
barg (725, 1450 & 5000 psig)
Alloy High Pressure Filters 20 barg (300 psig) 50
barg (725 psig)
Application:-
Walker Filtration design and manufacture a comprehensive range of high pressure
compressed air filters intended for the removal and separation of air borne
contaminants such as oil, water and dirt particles.
The Stainless Steel Filter Range offers 21 models with varying flow rate capacities,
with a maximum working pressure of 350 barg (5000 psig) at a maximum
temperature of 120°C (248°F).
The Alloy High Pressure Filters are manufactured using machined or die-cast
aluminium components. There are a total of 13 models in the 20 barg (300 psig)
range from 1/4” to 3” pipe connections with flow rates up to 4383 Nm³/h (2580
scfm). There are a total of 9 models in the 50 barg (725 psig) range from 1/4” to
2” pipe connections with flow rates up to 3200 Nm³/h (1882 scfm). They have
a recommended maximum temperature of 120°C (248°F).
WARNING: All filter housings operate at high pressures.
Extreme care should be taken. Do not operate filters above
maximum working pressure (mwp) at maximum operating
temperature.
Filter Housing Installation Guidelines:-
High pressure filters should be installed downstream of aftercoolers, receivers, at
the point of lowest operating temperature and as close to the point of application
as possible. Existing or new pipelines should be purged to remove any collected
debris. Filters are best utilised in mainlines and terminal points, avoid by-pass
lines where leaks often occur.
Putting into service:-
1. Select position for filter. It is vital to depressurise new or existing pipework
before installation.
2. Install filter into pipeline observing vertical orientation and direction of flow
arrow marked on the filter housing. On threaded models, PTFE tape or
sealing compound should be used on pipe threads to ensure a good seal.
Max. working pressure and replacement elements are marked on the filter.
3. To allow simple element replacement, ensure adequate space for removal of
filter bowl. See minimum required distance, dimension D on page 10 and 11.
4. All models of High Pressure Filters are supplied with a drain plug. High
pressure drains valves are available. Only drain valves rated to maximum
working pressure should be used. Contact manufacturer for further
information.
Note: Standard condensate float drains must not be
used on High Pressure applications.
5. During initial pressurisation of the system, inlet valves should be opened
slowly to reduce inlet velocities until system pressures are stabilised. Check
for leaks before putting filters into operation.
Note: The recommended maximum working pressure for the
Stainless Steel range of high pressure filters is 350 barg (5000 psig).
The recommended maximum working pressure for models 20HP25
to 20HP302 is 20 barg (300 psig).
The recommended maximum working pressure for models 50HP25
to 50HP201 is 50 barg (725 psig).
6.
Alloy High Pressure Housings (Models 20HP25 to 20HP302 and
50HP25-50HP201) should not be bolted together.
Connecting any one
or more of the above housings in series should be carried out using a nipple
or coupling with the correct thread form for the housing and should be
suitably rated for the operating temperature and operating pressure.
Maintenance
1. General maintenance and routine checks should be carried out to ensure
correct operation and to maintain long-term system reliability.
Filter Element Replacement
Coalescing filter elements should be changed every 12 months. Always complete
the element replacement label and attach to filter.
Grade AC, activated carbon elements will purify compressed air by removing oil
vapour and odours and must be changed to suit specific applications, or at least
every 6 months.
WARNING: AC elements do not remove carbon dioxide
(CO2), carbon monoxide (CO) or other toxic gases and
fumes.
Filter Element Installation Guidelines:-
1.
Shut
off
all
compressed
air
supplies
to
filter
housing.
2.
Close
inlet
valve
(s),
open
all
outlet
valves
and
ensure
system
is
fully
depressurised
before
dismantling
the
filter
housing.
3.
After
all
pressure
is
removed
from
the
filter,
grasp
the
filter
bowl
firmly.
Turn
bowl
anti-clockwise
to
unscrew
from
the
filter
head.
Strap
wrenches
can
be
used
on
the
bowls
if
necessary.
4.
With
the
Alloy
20
&
50
barg
range
of
high
pressure
housings
and
models
C
0
25
(grade)
-
C
0
50
(grade)
in
the
Stainless
Steel
range,
remove
used
element
by
pulling
downwards
and
dispose
of
element
properly
taking
necessary
health
and
safety
precautions.
5.
For
the
remaining
models
featured
in
the
Stainless
Steel
range
C75
(grade)
-
C201(grade)
and
100HP24
(grade)
-350HP101(grade)
tie
rods
are
incorporated
therefore
the
element
must
be
unscrewed
first.
6.
Check
housing
O-ring
in
filter
head.
Replace
if
worn
or
damaged.
Ensure
that
O-ring
seat
is
clean.
7.
Fit
new
element
with
O-rings
supplied,
check
that
the
O-ring
is
correctly
positioned
in
end
cap
and
lightly
greased.
8.
Clean
and
lubricate
threads
on
filter
bowl
with
light
silicone-free
grease.
This
allows
the
bowl
to
be
removed
easily
during
next
service.
9.
With
the
Alloy
20
&
50
barg
range
and
models
C
0
25
(grade)
-
C
0
50
(grade)
in
the
stainless
steel
range,
place
filter
bowl
over
element,
screw
into
head
and
tighten.
Do
not
over
tighten.
With
tie
rod
elements
tighten
nuts
where
fitted
firmly
or
screw
filter
directly
onto
the
rod.
10.
Close
outlet
valves.
11.
Close
valve
on
drain
valve
equipment
(if
in
use).
12.
Slowly
open
inlet
valve
(s)
and
re-pressurise
system.
If
leaks
occur,
depressurise
system
following
earlier
instructions
and
inspect
filter
housings
and
internal
O-ring
seals.
Re-fit
the
O-ring
checking
that
the
seal
is
clean.
Re-pressurise
the
system.M
WARNING!
ALL FILTER HOUSINGS OPERATE AT HIGH PRESSURES.
EXTREME CARE SHOULD BE TAKEN
ONLY A COMPETENT PERSON SHOULD ATTEMPT TO FIT
FILTER HOUSINGS AND CHANGE FILTER ELEMENTS
SERIOUS PERSONAL INJURY CAN RESULT IF THESE INSTRUCTIONS
ARE NOT FOLLOWED
DO NOT REMOVE REPAIR OR REPLACE ANY ITEM ON VESSEL
WHILST IT IS UNDER PRESSURE
DO NOT OPERATE IF THERE IS ANY EXISTING LEAKS TO VESSEL.
IMMEDIATELY TAKE VESSEL OUT OF SERVICE. CHECK ALL
POTENTIAL LEAK AREAS AND RE-SEAL PRIOR TO RE-INSTALLATION
IT IS RECOMMENDED THAT THE OPERATOR CONTACT THE
MANUFACTURER BEFORE INSTALLING ANY ANCILLARY EQUIPMENT
ON TO THE HIGH PRESSURE FILTERS
DO NOT OPERATE ABOVE MAXIMUM WORKING PRESSURE (M.W.P.)
AT MAXIMUM OPERATING TEMPERATURE.
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