Cooling Tower Cleaning & Disinfection - CIP
Pack Cleaners
Cooling Tower Cleaning - Accepta’s innovative
range of high performance cooling
tower cleaning products are based on the use of a unique foaming
chlorine dioxide (stabilised) system. Accepta's CIP pack cleaning
range has been developed to offer a practical alternative to pack
removal in the tower cleaning procedure outlined in paragraph 138
of the UK Health and Safety Executives Approved Code of Practice
L8, where it is not practical to remove the tower packing.
Although removal of the tower pack for cleaning is regarded as best
practice by the HSE, alternative methods of cleaning the tower may
be considered where there are practical difficulties in doing so.
The efficacy of these alternative procedures must be verified.
CIP Tower Pack Product Range
- CIP Tower Pack Foam Cleaner
- Accepta 2520 is a high performance foaming cleaner developed
for cooling tower pack cleaning and CIP applications. Accepta
2520 is based on phosphoric acid that incorporates a foaming
agent tolerant to acid and chlorine dioxide ... foaming
tower pack cleaner >>
- CIP Tower Pack Foam Cleaner
(Acid Safe) - Accepta 2522 is a low acid,
high performance foaming cleaner developed for cooling tower
pack cleaning and CIP applications. It is an alternative
product to Accepta 2520 and can be used where corrosion
may be an issue ... foaming
tower pack cleaner >>
- CIP Tower Pack Chlorine
Dioxide - Accepta 2521 is a specially developed
stabilised chlorine dioxide solution developed for use in
conjunction with Accepta 2520 and Accepta 2522 for cooling
tower pack cleaning and CIP applications. It is packed in
250 ml containers, and is sufficient to generate 50 ppm
of chlorine dioxide when mixed ... chlorine
dioxide tower pack cleaner >>
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Cooling Tower Pack |
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- CIP Tower Pack Antifoam
- Accepta "Tower Pack CIP Antifoam" is compatible
with both Accepta 2520 and 2522 and has been developed to
counter the foaming properties of the cleaning products
without leaving residues ... antifoam
>>
- CIP
Tower Pack Neutraliser
- Accepta "Tower Pack CIP Neutraliser"
has been selected to help neutralise both excess acidity
and chlorine dioxide, allowing safe disposal of the spent
cleaning solution from the tower ... neutraliser
>>
Method - Pack Cleaning Procedure
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This cleaning procedure is based on the use of the Accepta CIP
Tower Pack Cleaning products listed above and is intended for the
routine cleaning of cooling towers. It is not to be used for the
descaling of badly fouled towers. Where a tower is heavily fouled
an assessment of the nature and degree of fouling must be made,
and then an appropriate remedial procedure must be carried out.
The HSE’s Approved Code of Practice, L8, requires the following
steps:-
1) Pre-clean and disinfection
2) Pack removal and manual clean of the system
3) Post clean and disinfection
The basic steps in this alternative procedure are as follows:
1) Pre-clean and disinfection.
2) Foam the pack.
3) Rinse the pack thoroughly with defoamer and neutraliser.
4) Inspect the packing to verify the process has been effective.
5) Manually clean the tower to remove all debris etc.
6) Post clean disinfection.
Foaming the Pack
Select either Accepta 2520 for slightly scaled systems or Accepta
2522 for systems with no apparent scale or where there are components
vulnerable to acidic attack.
Do not use these products to clean evaporative condensers.
The activation procedure takes 15 – 20 minutes, so this
should be done towards the end of the pre-clean disinfection step.
Add the 250 ml of Accepta 2521 to 10 litres of Accepta 2520 or
Accepta 2522. Seal the container and mix the contents thoroughly,
at this stage 500 ppm of chlorine dioxide is generated and remains
active for several hours.
The chlorine dioxide is present to assist in the removal of biofilms
and to provide additional protection to operatives. It is
not present to eliminate the necessity for either of the usual
disinfection stages.
The foam is generated and applied through a suitable pressure
jet washer fitted with a venture device and foam lance. The venturi
must be fitted between the pump and the lance, not before the
pump, as this cause damage to the pump. The venturi must be capable
of mixing 10% detergent into the water. At 10% dilution the detergent
will contain 50ppm chlorine dioxide, this can be confirmed using
chlorine dioxide
test strips (0 – 100 ppm).
The foam lance should be capable of generating wet clingy foam.
Dry dense foam is not suitable as it does not penetrate the pack
and takes a long time to travel through the pack.
Appropriate health and safety measures should be taken working
at heights on slippery surfaces and when using hazardous chemicals.
Foam the top of the tower generously. As the product penetrates
reapply the product. Continue to apply the foam as required to
maintain a steady stream through the pack. As the foam exits the
pack test the acidity and chlorine dioxide levels. The results
will indicate the extent of scaling and fouling with organic matter.
Continue to foam and test until the foam exiting the pack has
an acidity and chlorine dioxide level close to that of the original
detergent. Leave the remaining foam in the pack for half an hour.
Treat the spent detergent in the tower sump with defoamer and
neutraliser. Rinse the pack with clean low pressure water.
The interior of the pack can be inspected using an endoscope.
If the condition of the pack is satisfactory, continue to clean
the remaining parts of the tower and follow the post-clean disinfection
procedure. If necessary and considered beneficial, repeat the
foaming procedure and then continue the cleaning and disinfection
process as normal.
If the product procedure has not achieved a satisfactory level
of cleanliness within the pack the strategy for cleaning the tower
must be reviewed.
Additional Information & Technical
Support
For further information, technical support and advice please call
Accepta on +44 (0) 161 877 2334 or e-mail info@accepta.com.
For additional products, specifications, product data and Safety
Data Sheets please review our products
pages.
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