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44
DECOMMISSIONING
1.
Become familiar with the equipment and its operation.
2.
Isolate system electrically.
3.
Before attempting the procedure, ensure that:
•
mechanical handling equipment is available, if required, for handling
refrigerant cylinders;
•
all personal protective equipment is available and being used correctly;
•
the recovery process is supervised at all times by a competent person;
•
recovery equipment and cylinders conform to the appropriate standards.
4.
Pump down refrigerant system, if possible.
5.
If a vacuum is not possible, make a manifold so that refrigerant can be
removed from various parts of the system.
6.
Make sure that cylinder is situated on the scales before recovery takes place.
7.
Start the recovery machine and operate in accordance with manufacturer's
instructions.
8.
Do not overfill cylinders. (No more than 80 % volume liquid charge).
9.
Do not exceed the maximum working pressure of the cylinder, even
temporarily.
10. When the cylinders have been filled correctly and the process completed,
make sure that the cylinders and the equipment are removed from site
promptly and all isolation valves on the equipment are closed off.
11. Recovered refrigerant shall not be charged into another refrigeration system
unless it has been cleaned and checked.
Equipment shall be labelled stating that it has been de-commissioned and emptied
of refrigerant. The label shall be dated and signed. For appliances containing
flammable refrigerants, ensure that there are labels on the equipment stating the
equipment contains flammable refrigerant.
Ensure that only appropriate refrigerant recovery cylinders are employed.
Ensure that the correct number of cylinders for holding the total system charge
are available. The recovery equipment shall be in good working order with a set
of instructions concerning the equipment that is at hand and shall be suitable for
the recovery of all appropriate refrigerants including, when applicable, flammable
refrigerants. In addition, a set of calibrated weighing scales shall be available
and in good working order. Hoses shall be complete with leak-free disconnect
couplings and in good condition.
Before using the recovery machine, check that it is in satisfactory working order,
has been properly maintained and that any associated electrical components
are sealed to prevent ignition in the event of a refrigerant release. Consult
manufacturer if in doubt. The recovered refrigerant shall be returned to the
refrigerant supplier in the correct recovery cylinder, and the relevant waste
transfer note arranged. Do not mix refrigerants in recovery units and especially
not in cylinders. If compressors or compressor oils are to be removed, ensure that
they have been evacuated to an acceptable level to make certain that flammable
refrigerant does not remain within the lubricant. The evacuation process shall be
carried out prior to returning the compressor to the suppliers.
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