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After the fi nal charging of the anaerobic nitrogen, discharge the gas into the
atmosphere pressure, and then the system can be welded. This operation
is necessary for welding the pipeline.
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 fi nishing the charging (or when it is not yet fi nished), label the mark
on the system.
•
Be careful not to overcharge refrigerants.
SCRAP AND RECOVERY
Scrap:
Before this procedure, the technical personnel shall be thoroughly familiar
with the equipment and all its features, and make a recommended practice
for refrigerant safe recovery. For recycling the refrigerant, shall analyze the
refrigerant and oil samples before operation.
Ensure the required power before the test.
1. Be familiar with the equipment and operation.
2. Disconnect power supply.
3. Before carrying out this process, you have to make sure:
•
If necessary, mechanical equipment operation should facilitate the
operation of the refrigerant tank.
•
All personal protective equipment is effective and can be used
correctly.
•
The whole recovery process should be carried out under the guidance
of qualifi ed personnel.
•
The recovering of equipment and storage tank should comply with the
relevant national standards.
4. lf possible, the refrigerating system should be vacuumized.
5. If the vacuum state can't be reached, you should extract the refrigerant in
each part of the system from many places.
6. Before the start of the recovery, you should ensure that the capacity of the
90
GB
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