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10.4 Maintenance of plate type heat exchanger
As the scales are created in the panel heat exchanger, its efficiency may decrease or damage may occur due to winter-sowing
due to the decrease in its flow.
Due to this reason, regular maintenance is necessary so that the scales shouldn't be created.
1. Before the season of use, check below points.(Once a year)
1) inspection on water quality to check if this is within the standard condition.
2) Clean the strainer.
3) Check if the flow is appropriate.
4) Check if the operation environment is appropriate.(Pressure, flow, output temperature)
2. Below procedure should be abided by in order to clean the panel heat exchanger. (Once every 5 years)
1) Check if the service port is equipped with the water pipe in order to clean the chemical solution.
5% diluted formic acid, citric acid, oxalic acid, acetate acid, phosphoric acid and etc. are appropriate for the chemical solu-
tion for wiping out the scales.(Hydrochloric acid, sulphuric acid, nitric acid and etc. shouldn't be used due to its corrosion.)
2) Be sure to check if the gate valve of inflow/outflow pipe and the valve for outflow pipe are properly closed when cleaning.
3) Connect the water pipe for cleaning with the chemical solvent through the service plug of the pipe and fill up the panel
heat exchanger with 50°C~60°C of cleaning solvent and circulate it with the pump for 2~5 hours. The circulation time
may depend on the temperature of the cleaning solvent or the creation of the scales. Therefore, observe change in the
color of the chemical solvent to set the circulation time for removing the scales.
4) After the circulation of the solvent, extract the solvent inside of the panel heat exchanger and fill up 1~2% of NaOH or
NaHCO
and then, circulate it for 15~20 minutes to neutralize the heat exchanger.
3
5) Once the neutralization is completed, clean the inside of the panel heat exchanger with clean water.
Measure the water pH to check if the chemical solvent is properly removed or not.
6) When using a different kind of chemical solvent in the market, be sure to check if there is any corrosive action to stainless
or copper in advance or not.
7) For details on the cleaning chemical solvent, be sure to consult the specialists of the related corporation.
3. After cleaning, operate the device to see if it works properly once again.
Gate valve(locked)
Service plug
Outflow water
valve(locked)
Installation
Gate valve(locked)
Water-cooling
type multi V
Strainer
[Cleaning the panel heat exchanger]
Hose
Screening net
Pump
50
50
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