DCF-3000 Installation, Operation & Maintenance
DOM0000007, Revision A
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Page 3 of 7
Operation
Notice: Do not exceed the normal operating
temperature of the lowest rated component. In most
cases this is 200 °F (93 °C).
1.
The unit self-cleaning controls should be on whenever flow is
occurring through the filter. The controls should be off when
there is no flow.
2.
The cleaning disc should stroke the filter element clean to keep
the differential pressure between the inlet and outlet of the filter
between 3 to 5 PSID (21 to 34 kPa). Stroking too frequently will
shorten the life of all wear components.
3.
The filter unit is supplied with a valve used to purge the
contaminants from the vessel. This valve should be opened
before the collected contaminants exceed the purge chamber
volume and cause a differential pressure increase.
4.
If the filter element is removed from the unit, avoid high pressure
washing from the inside of the element. This may force
contaminants into the filter media and cause permanent
blockage and/or element damage.
5.
Always pressurize the unit slowly on startup and watch for leaks.
6.
The unit is equipped with a 3/4
″
port in the lid for placement of
overpressure vent, for use as an air release and/or connection
for fluid filing of vessel.
7.
Monitoring of the differential pressure between the inlet and
outlet pressures should be used to determine stroking and
purging rates. Normal operation should exhibit low differential
pressure of 3-5 psi that is maintained continuously
Operational Modes
Filtering
Pressurized dirty process fluid enters thru the inlet port, passes
through the filter screen where contaminants are removed and clean
process fluid exits through the outlet port.
Screen Cleaning
The cleaning process occurs periodically during the filtering process.
As the dirty process fluid passes thru the filter screen, contaminants
are collected on the inside of the screen. The cleaning disc scrapes
the length of the element screen and pushes the contaminants into
the purge chamber.
Purging
The purging process occurs periodically during the filtering process.
The purge valve is opened, allowing the flow and pressure in the
vessel to push the concentrated contaminants collected in the purge
chamber out of the vessel.
CAUTION:
Do not backwash or operate the DCF-
3000 in any circumstance where flow can reverse
between the inlet and outlet ports. Backwashing
mechanically cleaned vessels may result in
damage to the element and cleaning disc
assemblies.
Inspection, Disassembly & Reassembly
To service the unit: Isolate from process fluids, from the process air
and electric supply by using proper lockout tagout procedures.
Depressurize unit by opening purge and vent valve in that order and
de energize all sources of power.
Figure 1
