Atlantic Boilers RS TURBOFLOW DN 50 S260+ Посібник з експлуатації та обслуговування - Сторінка 11
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Друкувати сторінку5.3 - Manual cleaning
• Always wear safety glasses and protective
gloves and follow the instructions for the
cleaning products used.
• Dispose of wastewater in accordance with
prevailing environmental protection regulations.
• Never use metal tools, abrasives, or
corrosives.
• Use a soft, non-metallic brush and suitable
detergent.
• A pressure washer may be used provided
the necessary precautions are taken to avoid
damaging the gaskets.
• Soak the plates in a detergent solution if they
are coated with thick deposits.
• Thoroughly rinse the plates, and especially
the gaskets, in cold or lukewarm water.
• Degrease the plates before reinstalling them,
especially if one of the fluids circulated is a
lubricant (e.g. oil).
• Carefully check the condition and sealing
surfaces of the gaskets, the flatness of the
plates, and the overall cleanliness.
5.4 - Clean in place (CIP)
• CIP is recommended if the heat exchanger
requires frequent cleaning or is hard to
disassemble.
• CIP can be performed provided it is
impossible for particles to build up inside the
heat exchanger. Likewise, if there is a
risk of the surfaces of the plates being
damaged by particles, manual cleaning should
be performed.
• The CIP procedure must be determined with a
specialised firm when the system is designed.
• After the first few cleanings, it may be
necessary to open the heat exchanger in order
to check the degree of cleanliness, adjust the
cycle time and determine the best product
concentrations.
Procedure
1) Completely drain all the circuits (if this is not
possible, run fresh water through the circuits
until the process fluids have been completely
flushed out).
2) Clean with fresh water (with a low chloride
content for the stainless steel plates) at a
temperature of around 40°C to eliminate all
traces of the process fluids. Run this water in
the opposite direction of normal operation. An
even better result can be obtained by running
the water alternately in one direction and then
the other (this is advised for steam applications
or to eliminate residues such as fibres and
particles). The use of filters upstream of the heat
exchanger will reduce the need for this.
3) Completely drain the water from the circuits
and connect the CIP unit. Do not let the solution
sit in the exchanger.
4) For even better cleaning, use a centrifugal
pump installed between the CIP and the heat
exchanger. Circulate the detergent solution in
the direction opposite that of the fluids so as to
eliminate all traces of dirt.
5) Circulate a quantity of detergent solution
at above the nominal mflow rate but without
exceeding the maximum allowable flow rate
(determined by the nominal diameter).
6) Thoroughly flush both circuits with fresh water.
5.5 - Detergents
• Never use hydrochloric acid (HCl) or
chlorinated compounds with stainless steel.
• Never use phosphoric acid with titanium.
• Suitable detergents may be obtained from
specialised firms. Specify the plate and gasket
types to obtain a detergent that will not remove
the protective oxide layer on the plates or
destroy the gaskets.
• Nitric acid (HNO3) and sodium hydroxide
(NaOH) may be used to clean stainless steel
and titanium plates.
• Polyphosphates may also be used.