Chapter 8 - Operating Procedures
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7. Thread cylinder nut hand tight into/onto clean undamaged cylinder valve outlet. Be careful
not to cross thread connections.
8. Tighten nut using appropriate tools to support pigtail. Do not apply excessive torque. Refer
to CGA Pamphlets in Appendix for recommended torque of cylinder connection.
9. Close enclosure door.
8.3.1.3 Cylinder Connection Leak Check (Purge Cylinder)
1.
Open access window.
2.
Slowly open purge cylinder valve to fill pigtail panel with purge gas.
3.
Close cylinder valve.
4.
Slowly open MV13 to vent purge gas from pigtail.
5.
Close MV13.
6.
Repeat steps 3-5 a minimum of 10 times to purge the pigtail of any contaminants that may
have entered during purge gas cylinder installation.
7.
Open MV10.
8.
Slowly open purge cylinder valve to fill pigtail and purge panel with purge gas. PI3 should
indicate full cylinder pressure.
9.
Close cylinder valve.
10.
Observe PI3 for any pressure decay for five (5) minutes.
11.
If there is no decay, the cylinder connection is not leaking at a detectable level. Proceed to
step 13.
12. If there is a pressure drop, a leak is indicated.
a.
Slowly open manual valve MV13 to completely vent purge gas pressure in
pigtail.
b. Close valve, MV13.
c.
Close valve, MV10.
d. Remove purge cylinder from the pigtail.
e.
Reinstall the purge cylinder (reference Section 8.3.1.2 "Full Purge Gas
Cylinder Installation.)
f.
Retest following steps 1 through 11 in Section 8.3.1.3.
g. If leak persists, remove cylinder (reference Section 8.3.1.1 "Empty Purge Gas
Cylinder Removal Procedure".)