14
5.
COMMISSIONING AND OPERATION
Unsafe operation
Commissioning and operation by unqualified
personnel may result in unsafe operation, defects
and accelerated corrosion.
Ø
The box cooler may only be commissioned and
operated by suitably trained, qualified and
instructed engineers and electricians.
Ø
The box cooler may not be started or used
before it is completely installed and inspected
according to the instructions in this manual.
Ø
Keep the operating conditions within the
design limits.
5.1.
CHECK THE SYSTEM FOR SATISFACTORY
INSTALLATION
q
Verify that all safety devices in the system (pressure
limiting device, temperature control system) are
correctly set and tested before start-‐up.
q
Verify that all piping and pipe fittings are properly
fixed and supported and allow for sufficient flexibility
(see section 4.3.1).
q
Check all bolted connections for tightness. Refer to
section 4.4.4 for tightening torques. Verify also that no
bolts or nuts are missing or broken.
q
Check also the installation and working of the ICAF
system (when applicable).
5.2.
START-‐UP AND OPERATION
Do not use the box cooler outside of its specification
range (operating pressure, operating temperature,
flow speed, used fluids)
.
1)
Open the vent valve and fill the box cooler gradually
with the fluid for which it is designed.
Minimize
stresses, ensure that the pressure rises slowly and
the box cooler heats up evenly.
2)
Allow all air in the box cooler as well as from the
whole system to escape then close the vent valve.
3)
Allow the circuit to pressurize and open the return
valve so the liquid can flow through.
4)
Regularly carry out the inspections of section 6.1.
During the initial period of operation the system
needs to be inspected more frequently.
Shutdown the box cooler immediately in case
of any possible defect, leakage or when the
operating conditions are not within the design
limits.
Investigate the cause (see section 7) and restart
the box cooler only when all defects are fixed
by a qualified maintenance engineer.
5)
After the initial 8-‐10 hours of operation, shut the box
cooler down (according to the instructions of
section 5.3) and retighten all bolted connections (see
section 4.4.4).
5.3.
SHUT-‐DOWN
1)
Stop the equipment that is cooled by the circulating
liquid.
2)
Wait until the equipment has cooled down
sufficiently.
This is to prevent overheating of both the box cooler
and the equipment that is cooled.
3)
Stop the circulation of the liquid.
Drain during shutdown to avoid freezing
The medium will expand when it freezes and this may
cause the tubes of the box cooler to burst and the
water covers to become deformed.
Therefore drain the system when freezing is expected
during shutdown. Blow the water out of the tubes
using compressed air.
When a suitable amount of antifreeze is added to the
stagnant liquid, the box cooler does not require to be
drained. (Note that the adding of antifreeze to the
cooling water may have consequences for the
performance of the box cooler. Check the technical
specifications or contact Duramax Marine® for advice.)
Alternatively, keep the liquid circulating if the system
must be left full.
