DC Inverter Air
2) Th e attention shall be paid to the assembly direction and angle of the liquid pipe and gas pipe openings
to avoid the oil backflow or accumulation;
3) The alternative method for nitrogen injection is the standard operation method during the welding
operation.
A. Preparation for fire prevention (to avoid the fire, conduct in clean area, prepare the fire‐fighting
equipment and water for emergency purpose);
B. Pay attention to the avoidance of scalds;
C. Pay attention to the gap between pipe and nipples (avoid the leakage);
D. Confirm the support strength for pipes.
The spacing criteria for supports of horizont al pipes (cop er tube) are as follows:
Minimum embedding depth and gap of copp er tube nipples/fittings
4. Flare Connection
1) Th e auxiliary connecting pipe must be annealed before the flaring operation;
2) The pipe shall be cut by pipe cutter (the large diameter pipe shall use the large cutter; when the diameter is
so large that it cannot be cut by the pipe cutter, the metal saw shall be used, but attention
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