E. INSTALLATION
1. If necessary, clean NPT threads on the holder. Wire brush-
ing is usually sufficient. Seal threads with Teflon® tape or
pipe thread sealant.
2. Thread screw type assembly into the installation. One-
half turn past hand tight is recommended. Always apply torque
using the flats nearest to the end being installed.
3. Experience has shown that, in some installation condi-
tions, it may be necessary to re-torque the assembly after
the system has operated through normal pressure and tem-
perature cycles.
Under normal operating conditions, the rupture disc should
be replaced yearly. Severe operating conditions may require
that the rupture disc be replaced more frequently.
4. The metal tag shall be attached to the ST assembly in a
manner that will prevent changing the rupture disc without
breaking the seal. Reference figures 5 showing the tag at-
tached using a lead shunt and 0.02” SST wire as recom-
mended practice.
Figure 5 - Screw Type
)
I
S
P
0
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3
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p
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w
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8
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8
3
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0
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0
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t
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2
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6
6
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0
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4
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1
8
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4
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1
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2
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1
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2
1
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0
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3
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1
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6
6
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8
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0
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t
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4
3
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1
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3
8
-
0
0
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8
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t
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0
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>
0
3
1
-
0
0
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2
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t
0
0
5
1
>
0
9
-
0
0
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9
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t
0
0
0
8
>
0
4
1
-
0
0
5
2
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t
0
0
0
2
>
8
9
-
0
0
0
0
1
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t
0
0
0
9
>
0
5
1
-
0
0
0
3
o
t
0
0
5
2
>
5
0
1
-
0
0
5
2
1
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t
0
0
0
0
1
>
5
7
1
-
0
0
0
5
1
o
t
0
0
5
2
1
>
0
0
2
-
Table 1
