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English
WFN/WFC/WFS/WFA/WFP
to protect against seismic activity.
h) Install fi re-prevention and fi re-fi ghting equipment suitable
for the area in which the unit is installed in order to protect it
against fi re.
i) If operating temperature exceeds 60°C, fi t any protective
guards necessary to prevent accidental contact and burns.
RESPECT THE DIRECTION OF THE AIR/WATER IN-
LET AND OUTLET LABELS.
AIR/GAS CONNECTIONS: Attach the compressed air piping to
the threaded / fl anged connections on the apparatus (if non-stand-
ard fl anges are used, ensure that their internal diameter allows a
free air passage to all the aft ercooler’s tubes).
Th
e apparatus must be installed immediately down-streamof the
compressor, and with the separator down-stream of the aft ercool-
er.
WATER CONNECTIONS: Attach the cooling water piping to the
aft ercooler’s threaded/fl anged connections.
Ensure the following:
• Th
e water inlet must always be below the water outlet (to
maximize performance and allow water to drain out when
idle).
• Th
e water must drain away freely (to prevent water entering
the compressed air tubing in the event of a fracture).
• For closed water circuits, ask for separate instructions and
install a safety valve (set at a pressure below the maximum safe
pressure of the weakest point in the circuit).
• Guarantee a constant water fl ow and install a water fl ow
detector (eg. visible discharge to drain, sight glass, etc.) or an
automatic compressor shut-down device.
5. Operation and maintenance
Maintenance must only be performed by specialist
personnel.
FOR SEPARATOR SEE RESPECTIVE MANUAL.
Th
e temperature of incoming fl uids, must never exceed the maxi-
mum value specifi ed on the data plate. If temperatures exceed the
specifi ed values, contact the manufacturer for further information.
Avoid subjecting the unit to thermal stress caused by repeated
fl uctuations in incoming fl uid temperature.
To guarantee optimum operation, ensure that the maintenance
program below is performed regularly, and that the following rules
are respected:
• Ensure a constant water fl ow.
• Respect the fl uid temperatures specifi ed at the time of pur-
chase of the unit; if this is not possible, contact the manufac-
turer for further information.
• Avoid rapid scaling by keeping thewater outlet temperature as
low as possible.
• Drain all water out of the aft ercooler when it is not in opera-
tion (to prevent ice formation).
Maintenance program
AIR/GAS CIRCUIT
frequency:
Every 1000---8000 hours of operation, depending
on air quality and compressor type.
operation:
Remove the carbon, tars and dust, formed on the
insides of the aft ercooler’s tubes, using suitable solvents. Aft er-
wards thoroughly dry the insides of the tubes using compressed
air.
Check for signs of corrosion, in which case contact the author-
ised inspector or the supplier for authorisation to continue using
the unit.
WATER CIRCUIT
frequency:
Aft er 1000-1200 hours of operation, and thereaft er
as appropriate according to the degree of encrustation (ie. the
water hardness and temperature).
operation:
Connect a pump to the aft ercooler’s water inlet and
outlet and then clean the circuit by pumping through a chemical
descaler. Aft erwards rinse by pumping through with water.
ALWAYS CLEANINTHEOPPOSITEDIRECTION TO THE
COOLING WATER FLOW.
NOTE:
It is advised to stock a spare set of gaskets.
!
IMPORTANT
-Please note that stainless steel aft ercoolers should not be used
with sea water. Static sea water is corrosive for stainless steels
and if the sea water is drained, allowing sea ambient air to come
into contact with the water side of stainless steel, corrosion con-
tinues.
-Cupro Nickel aft ercoolers can benefi t from being passifi ed
prior to use. Passivation is a one time operation achieved by
fl owing clean sea water, from open sea, for a minimum of three
days to create a protective fi lm on the metal surface. Note that
at low sea temperatures the protective fi lm takes longer to form.
Cupro Nickel alloys are sensitive to biological agents and pol-
lutants (sulphate reducing bacteria can produce sulphides that
can start corrosion and pitting) typically present in harbours,
ports and coastal waters and we recommend that for sea water
cooling of Cupro Nickel aft ercoolers that there is constant water
fl ow through the aft ercooler. If the Cupro Nickel aft ercooler is
typically used on board vessels in port side water or dirty sea
water then we recommend fl ushing the aft ercooler with clean
sea water as soon as the vessel leaves port and is in open waters
as would occur if the water fl ow is constant as previously rec-
ommended. If, however, the installation is permanently in dirty
water, for example a harbour installation or a fl oating station, it
is recommended to introduce a clean sea water fl ush process or
to install a secondary hydraulic circuit to ensure that clean water
is used through the aft ercooler. Verify and clean the aft ercooler
tube bundle at least quarterly.
-All water-cooled aft ercoolers need to be protected against rust
or other solid particles entering the cooling water inlet of the
aft ercooler. Avoid excessive water fl ow above 2-3 m/s which can
damage the compressed air/gas tubes at the water inlet section.
- Avoid too leaving the water side drained of water. For remov-
able tube bundles do not use metallic brushes which can damage
the tubes.
