MNL000449.doc
Revision 22
02/15/2019
Gasguard Distribution
© Versum Materials, Inc. as of the revision and date shown. All rights reserved.
Confidential and Proprietary Data
Page
10
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10
Versum Materials Confidential
10.3
Safety Interlock Maintenance
The following maintenance should be performed to verify functioning of the
process alarm safety interlocks. Setpoints for the safety interlocks are located in
Section 11, System Specific Information of this manual.
Item
Task
Frequency
EFS2, Excess flow
Verify that process flow
rate above the setpoint
shuts the system down.
Every six months
PT2, Branch delivery
pressure
Verify that process
delivery pressure above
the setpoint shuts the
system down.
Every six months
PT1, Process inlet pressure
Verify that process inlet
pressure above the high-
high setpoint sounds the
alarm and shuts the
system down.
Every six months