MNL000447.doc
Revision 0 0
09/19/2016
© Versum Materials, Inc. as of the revision and date shown. All rights reserved.
Confidential and Proprietary Data
Page
-
24
8.6
Manual Mode Operation
Only experienced operators should operate the
Distribution System in manual mode. Operating
valves out of their proper sequence could
potentially cause damage to the product by
interrupting or providing insufficient gas flow.
Manual operation should not be used for normal,
daily operation.
Manual mode provides a means of flowing purge gas through the valve manifold
panel lines during Distribution System installation and pre-start-up procedures. It
also provides a means of flowing purge gas while maintenance or repairs are being
performed. Manual mode should not be used for process gas flow as critical
shutdown alarms may be disabled.
NOTE: Access to Manual Mode is not permitted when a digital
Shutdown alarm condition is present.
8.6.1 How to Operate in Manual Mode
Operating in Manual Mode can cause the
following hazards which can result in
PERSONAL INJURY OR DEATH.
Process gas could be forced into the
purge piping and source.
Opening purge valves when process gas
is present.
Process gas could be unintentionally
vented.
Opening vent valves when
high pressure process gas is
present.
Alarms associated with normal process
flow (excess flow, process pressure) are
disabled in Manual Mode.