MNL000447.doc
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09/19/2016
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8.4
Line Purge and Process Line Purging Procedures
8.4.1 Purge Procedure
This procedure purges hazardous gas from the selected Line prior to maintenance
or other operations on the Line that require removal of hazardous gas to safe
levels.
NOTE: A process line purging procedure (rough line evac or flow
purge) must be performed on the Line before the Line purge can
be initiated. This reduces the concentration and pressure (< 0
psig) of hazardous gas in the Line downstream of the manual Line
outlet valve (MV9-1, 9-2, 9-3, 9-4) so that maintenance can be
performed safely on the upstream Line.