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14
ENHANCED TECHNOLOGY
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, Aℓ
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.
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