13
5.1.4 Perform An In-Place Cleaning Wash Cycle
If the PSG is equipped with In Place Cleaning, a daily wash
cycle is required. Refer to In Place Cleaning Owner’s Manual and
Sequence of Operation Instructions. A typical seven day wash
cycle would be six day waterwash without detergent with the
seven day a detergent wash. The “Detergent Frequency Selection”
can be increased up to everyday. The auto wash cycle is initiated
by a Parker time clock, with the wash cycle sequencing, wash
cycle times, and detergent frequency through the unit’s PLC. A
wash cycle can be manually initiated, identical operation as the
auto wash cycle, at the unit Main Electrical Panel for an additional
wash cycle. A wash cycle whether a manual or by time clock can
only be initiated with the PSG off line. The wash cycle frequency
could be increased or decreased depending on visual inspection
of the components and high voltage measurements. When
the PSG is placed on line after a wash cycle, the power pack
enclosure(s) indicator light(s) may intermittently or continuously
flash for approximately 60 minutes. If this condition exceeds 60
minutes refer to Section 10 Troubleshooting.
5.1.5 Manually Cleaning System Components
The system components could require manual cleaning, weekly,
bi weekly, monthly, one to three months interval, every six months,
or yearly depending upon application/high voltage measurements.
Refer to Sections 6, 7, and 8. Manual cleaning should not exceed
yearly.
6. Manual Cleaning of SMOG-HOG®
Components
There are a number of methods for manual cleaning, certain key
cleaning criteria contribute to the effectiveness of every method.
These include the type of detergent, detergent strength, water
temperature, agitation/impingement, duration, rinse procedure and
dry-out time.
6.1 Type of Detergent
In general the detergent used on most hydrocarbons (e.g., oily
residues) will be alkaline in nature. It is extremely important that
the detergent have a built-in buffering agent to reduce aluminum
deterioration.
6.2 Detergent Strength
Detergent concentration in a mixture with water varies with the
application from 1:1 to 25:1 parts water to parts detergent. For
any contaminant condition, the best course is to use a cleaning
solution per the detergent manufacturer’s directions. More or
less detergent may eventually be required for effective cleaning
at reasonable detergent cost. The standard factory detergent
concentration setting is 5% (20:1).
Figure 13
Grounding The Ionizer Section
Figure 12
Grounding The Collector Cell Section
!
CAUTION
Never mix caustic and alkaline detergents for any
manual or in-place cleaning. Detergent mixing could
cause rapid heat release, gel formation or some other
undesirable condition. Complete purging of system
piping and soak tanks is required when changing
detergents.
6.3 Water Temperature
Detergents can be up to twice as effective in hot water. Hot
water alone is very effective in softening built-up residue. Water
temperature should be 140°F to 170°F, not to exceed 180°F.
6.4 Agitation/Impingement
These methods are virtually the same, with impingement being
the most extreme form of agitation. Any liquid movement over
built-up residue will remove a layer, allowing detergent to work
on the next layer. A reduction in cleaning time duration usually
results.
6.5 Cleaning Cycle Duration
In most cleaning methods, adequate time should be allowed for
the detergent to remove the contaminant thoroughly. Reaction
time will vary depending on detergent strength, temperature and
agitation. Guidelines for mixing, heating and expected results are
included on specification sheets for most detergents. Time is
necessary for effective cleaning. Soaking may seem slower and
less effective than high impingement and/or hot water above
180°F. Personnel should be forewarned about using excessive
pressure or temperature to shortcut the cleaning process. High
pressure or stream spray cleaning at point blank range until cell
plates edges are shiny is not effective. Not only will penetration
to the cell core not occur, but warping and bending of the plates
may result as well. Patience and thoroughness of cleaning
best preserve the integrity of the components in the long term.
Soaking and gentle rinsing provides for best results.
