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MAINTENANCE PROCEDURES

9

MECHANICAL CLEANING

Keeping your evaporative cooling equipment (and the associated
system) clean will maintain its efficiency and help to prevent
uncontrolled bacteriological growth. The recommended cleaning
procedures are described  below :
1. Disconnect fan and pump motor(s) and shut off make-up supply.
2. Remove screens, eliminators, access panels and doors and

drain system. Do not remove sump strainer.

3. Clean debris from exterior and fan(s) with soft brush, if

necessary use water and soap.

4. Clean interior with (soap) water and soft brush, if necessary use

high pressure water jet. 

5. Remove any debris from water distribution system and clean any

nozzles if clogged.  If necessary nozzle and grommet may be
removed for cleaning.

6. Remove debris from heat transfer section (coil/fill) . Do not use

steam or high pressure water to clean cooling tower wet deck
surface. 

7. Flush with clean water and drain to remove accumulated dirt. 
8. Remove, clean and replace sump strainer(s).
9. Clean debris from screens and eliminators with water jet and

install.

10.Remove debris from access doors and panels with soft brush

and (soap) water and install.

11.Close drain and open make-up supply. Fill system to overflow

level with clean water.

DISINFECTION

Disinfection of your cooling system may be needed in case of high
concentration of aerobic bacteria and/or Legionella. Disinfection is
also recommended for evaporative cooling systems with known or
suspected high bacteriological levels, prior to a cleaning procedure.
Some local or national guidance also recommends disinfection
prior to initial start up, after a prolonged shut down, after routine
cleaning operations or when significant alterations have been made
to the cooling system. 
Disinfection must be carried out in accordance with a proper
procedure and take into account the safety of the cleaning and
disinfection staff.
Typically disinfection is achieved using a sodium hyperchloride
solution to maintain a residual value of 5 - 15 mg/l of free chlorine
and circulate this around the system for up to 6 hours. Higher
chlorine levels for a shorter period are possible, but require a higher
level of corrosion protection than galvanized steel only. Consult your
BAC Balticare representative for further information. 
Excessive levels of chlorine must be avoided as this quickly can lead
to corrosion and damage to your system.
Chlorinated water should be de-chlorinated before draining and
after disinfection the system must be thoroughly flushed through
with clean water.

Note: A proper regularly monitored biocide programme reduces the need for
cleaning and disinfection actions significantly.

Cleaning Procedures

Содержание VCL

Страница 1: ...a guide to achieve these goals In addition to establishing the operating plan and the cooling system logbook it is recommended to conduct a cooling system risk analysis preferably by an independent third party For the cooling system scale corrosion and biological control must be established and initiated when the system is first filled with water and administered on a regular basis thereafter in a...

Страница 2: ...2 Water Distribution Section 3 High Efficiency Drift Eliminators 4 Fan 5 Fan shaft and bearing 6 Fan motor 7 Wet Deck Surface 8 Strainer 9 Water Make up Valve 10 Coil VTL Cooling Towers VFL Closed Circuit Cooling Towers VCL Condensers ...

Страница 3: ...G TOWERS VTL Maximum inlet pressure 0 5 bar Water inlet temperature max 55 C std fill or 65 C high temperature option For circulating water quality compatible with construction materials refer to section WATER CARE on page 4 Note Actual spray pressure is indicated on technical data sheet supplied with order acknowledgement All piping external to BAC cooling equipment must be supported separately I...

Страница 4: ...on in order to prevent white rust Passivation is the formation of a protective passive carbonate layer on galvanised steel surfaces On newly installed units to provide maximum protection from corrosion one must take special measures to passivate galvanised steel surfaces To ensure proper passivation of the galvanised steel keep the pH of the circulating water between 7 0 to 8 2 for four to eight w...

Страница 5: ...loat Arm Assembly 5 Float Valve To make the initial setting adjust the wing nuts so that the valve is completely closed when the water level in the cold water sump is 13 mm below the overflow level Under normal load conditions this setting should produce the correct operating level At low load conditions the operating level will raise and need be adjusted BLOW DOWN In case of a continuous blow dow...

Страница 6: ...mps must rotate in the correct direction which is indicated by arrows on the equipment Check proper functioning as follows 1 Stop fan s and pump s 2 Turn the fan by hand to ensure rotation without obstruction Remove obstruction if present 3 Start the pump s and check for the proper rotation as indicated by the arrow on the pump cover If rotation is wrong stop pump and correct electrical wiring 4 S...

Страница 7: ...cedure is as follows 1 Shut off the fan s but leave the pump s running 2 Check and adjust spray pressure if required not applicable for coil models with standard pumps 3 Remove the eliminators 4 Check to see if the nozzles are producing the spray pattern shown in figures below 5 Clean water distribution from dirt and debris Ensure spray branches and nozzles are in place and clean Replace damaged o...

Страница 8: ... new grease appears at the seal In particular when extended lubrication lines are fitted ensure that ALL old grease is removed and that new grease is leaving the seal The bearings should be lubricated only with a hand grease gun Do not use high pressure grease guns since they may rupture the bearing seals When lubricating purge the old grease from the bearing by gradually adding grease until a bea...

Страница 9: ...er DISINFECTION Disinfection of your cooling system may be needed in case of high concentration of aerobic bacteria and or Legionella Disinfection is also recommended for evaporative cooling systems with known or suspected high bacteriological levels prior to a cleaning procedure Some local or national guidance also recommends disinfection prior to initial start up after a prolonged shut down afte...

Страница 10: ... the full factory warranty Factory authorized replacement parts are available normally within four days after receipt of an order In emergency cases shipment can be usually made within 24 hours To order factory authorized parts contact your local BAC representative Be sure you include the unit serial number when ordering any parts To facilitate servicing of the equipment it is suggested that the f...

Страница 11: ...quired to ensure a safe and efficient operation of your evaporative cooling products From a full range of risk assessment to selective water treatment training testing record keeping and annual system overview Contact your local BAC representative for further information and specific assistance INTERESTING WEB SITES www BaltimoreAircoil com Balticare More Information ...

Страница 12: ... Every Six Months Annually Shutdown Checks and Adjust ments Cold Water Basin and Strainers X X Operating level and make up X X Blow down X X Sump heater package X X Belt tension X X Drive alignment X X Locking Collar X X Rotation of fan s and pump s X Motor voltage and current X X Unusual noise and or vibration X X Inspections and Monitoring General condition X X Heat transfer section X X Finned d...

Страница 13: ...NOTES 13 ...

Страница 14: ...14 NOTES ...

Страница 15: ...NOTES 15 ...

Страница 16: ...ANCE AND MONITORING PROGRAMME www BaltimoreAircoil com info BaltimoreAircoil co za Baltimore Aircoil Comapy SA Pty Ltd Portland Road Phillipi Cape Town South Africa Baltimore Aircoil Company SA Pty Ltd Model Serial number ...

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