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operations that the flammability is already taken into consideration are the
key. You should follow the following procedures:
•
Remove the refrigerant.
•
Decontaminate the pipeline by inert gases.
•
Evacuation.
•
Decontaminate the pipeline by inert gases again.
•
Cut or weld the pipeline.
3.
The refrigerant should be returned to the appropriate storage tank. The
system should be blown with oxygen free nitrogen to ensure safety. This
process may need to be repeated for several times. This operation shall not be
carried out using compressed air or oxygen.
By blowing, the system is charged with anaerobic nitrogen to reach working
pressure under vacuum, then the oxygen-free nitrogen is released into the
atmosphere, and finally the system is evacuated. This process is repeated until
all the refrigerant in the system has been purged. After the final charging of
the anaerobic nitrogen, the gas is released to atmospheric pressure and the
system can be welded. This operation is necessary to weld the pipework.
Procedures of charging refrigerants
As a supplement to the general procedure, the following requirements need to be
added:
•
Make sure that there is no contamination among different refrigerants when
using a refrigerant charging device. The pipeline for charging refrigerants
should be as short as possible to reduce the residual of refrigerants in it.
•
Storage tanks should remain vertically up.
•
Make sure the grounding solutions are already taken before the refrigeration
system is charged with refrigerants.
•
After finishing the charging (or when it is not yet finished), label the mark on
the system.
•
Be careful not to overcharge refrigerants.
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