Data Aire gForce Ultra, Инструкция по установке, эксплуатации и обслуживанию, Страница: 70 / 123

gForce Ultra IOM
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Cleaning
Although cleaning of in situ condensers is a difficult process, it may be necessary in extreme
circumstances. Fouling of a condenser can be corrected by chemical cleaning, reverse flushing or a
combination of both. Both procedures will require temporarily disconnecting the condenser on the water
side and preforming these procedures. Reverse flushing in situ is the simplest option and may be the
only treatment necessary if fouling is predominantly caused by sedimentation. If however, scaling has
occurred, chemical cleaning will be necessary. This should be performed using a weak acid cleaning
liquid pumped through the heat exchanger in reverse flow direction at approximately twice the normal
flow rate. Remember that the cleaning acid should be circulated in reverse flow for usually 24 hours. At
the completion of the cleaning process, it is important that the condenser be flushed with clean water
for at least 30 minutes.
Corrosion Protection
Stainless steel has a high resistance to most chemicals but is sensitive to chloride ion concentration so
this must be limited to 280 ppm or less in systems operating at less than 131°F (55°C). The copper
used in the brazing process is mainly sensitive to strong acid and ammonia so the pH must be
maintained between 6 and 8. Hydrochloric acid should never be used to clean the exchangers.
NOTICE: Risk of corrosion can cause equipment damage. Contact a water
consultant about water quality, corrosion and freeze protection requirements.
Water chemistry varies greatly by location, as do the required additives, called
inhibitors that reduce the corrosive effect of the fluids on the piping systems
and components. The chemistry of the water used must be considered,
because water from some sources may contain corrosive elements that
reduce the effectiveness of the inhibited formulation. Preferably, surface
waters that are classified as soft and are low in chloride and sulfate ion content
should be employed. Proper inhibitor maintenance must be performed to
prevent corrosion of system components. Consult glycol manufacturer for
testing and maintenance of inhibitors.
Commercial ethylene glycol, when pure, is generally less corrosive to the
common metals of construction than water itself. It will, however, assume the
corrosivity of the water from which it is prepared and may become increasingly
corrosive with use if not properly inhibited
Fluid Cooler
Information regarding fluid cooler
(or often referred to as a “dry cooler”) operation and internal volume,
the volume of the interconnecting piping and the freezing point of aqueous solutions can be found in
the individual Fluid Cooler User Manuals which should be referred to for more complete details.