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14
EN
HANCED
TEC
HNOLOGY
3.5.3. SF6 gas pressure-Temperature Curve
A l a m p r e s s u r e
( 0 . 2 k g / c m G )
N o r m a l f i l l i n g p r e s s u r e
( 0 . 5 k g / c m G a t 2 5 C )
S a f t y d e v i c e o p e r a t i n g p r e s s u r e
Figure 3-4. SF6 gas pressure -Temperature curve
3.6. MOLECULAR SIEVE
The molecular sieve to be used is type 13X and other designations must not be used in SF6 gas.
The 13X has a controlled pore size of about 9 angstrom (0.9
㎜
) as typical chemical Na
2
O, A
ℓ
2
O
3
,
2.5SiO
2
, nH
2
O.
A polyester bag containing molecular sieve beads is placed inside the enclosure and the control
cubicle.
Molecular sieve 13X is commonly used for the concurrent removal of H
2
O and CO
2
from gas, air
streams and removal of H
2
S.
Molecular sieve 13X can be regenerated by evacuating or purging, usually at elevated temperatures
ranging from 200
℃
to 300
℃
.
Higher temperature may cause physical degradation of the molecular sieve structure.