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7
2.3.2
Gas Circuit
Gas circuit connection of side blow assembly and coaxial nozzle assembly are shown in below figure 2-2 (A) & (B).
Fig. 2-2 Gas Circuit Connection
Requirements for gas are shown below. Generally, the air pressure rate of compressed air is 0.4-0.6Mpa. The protective
gas shall be nitrogen, argon, or helium and the pressure is around 0.1Mpa. Adjustment can be taken for actual needs.
Gas
Maximum content of water vapor (ppm)
Maximum content of hydrocarbon (ppm)
Nitrogen
<5 ppm
<1 ppm
Argon
<5 ppm
<1 ppm
Helium
<5 ppm
<1 ppm
Air
<5 ppm
<1 ppm
compressed air
protective gas
protective gas
