Entec EVRC2A - SF6 Gas; Specification of Sulphur Hexa Fluoride Gas (SF6)

EVR AUTOMATIC RECLOSER http://www.entecene.co.kr
13
ENHANCED TECHNOLOGY
3.5. SF6 GAS
3.5.1. General
The high purity SF6 gas filled with 0.5bar gauge keeps the insulation of the equipment and prevent
corrosion of the main tank components.
3.5.2. Specification of Sulphur Hexa Fluoride Gas (SF6)
Table 3-1. Specification
Determination Specification Unit Analysis
Purity
> 99.9
% wt
> 99.9
CF4
≤ 0.05
% wt
< 0.03
Air
≤ 0.05
% wt
< 0.03
Water
≤ 50
Vppm
< 50
Acidity as HF
≤ 0.3
mg/kg
< 0.3
Hydrolye, fluor
≤ 1
mg/kg
< 1
Table 3-2. Physical properties
Sublimation point (1.0133 bar)
-63.9℃
Melting point (2.26 bar)
-50.8℃
Vapour pressure (20℃)
21.08 bar
Critical temperature
45.55℃
Critical pressure 37.59 bar
Critical density 0.74 kg/l
Gas density (20℃, 1bar)
6.07 g/l
Liquid density (0℃, 12.65 bar)
1.56 kg/l
Acoustic velocity in SF6 129.06 m/sec.