Air Products GASGUARD TE10, Installation, Operation And Maintenance Manual

Page: 159 / 196

Section 9: Troubleshooting
Revision – November 2004 9 - 5
9.2 No or Low Purge Gas Pressure
Possible Source of
Problem
Test
Solution
Closed purge gas supply
valve Check position of supply
valve. Open supply valve.
Purge gas supply pressure
regulator set incorrectly Check setting on pressure
regulator. Set pressure regulator to
correct delivery pressure
[80-90 psig (5.5-6.2
barg)].
Low purge gas cylinder
pressure Check cylinder pressure. Change cylinder.
Instrument nitrogen
supply not adequate to
open purge gas pneumatic
valves Check instrument nitrogen
pressure. Adjust to 85-95 psig
(5.9-6.6 barg) if
necessary.
Purge gas pressure
transducer(s)
malfunctioning Check input to controller,
Check connections and
signal from pressure
transducers. Repair connections,
repair or replace
transducer(s) as
necessary.
9.3 No or Low Purge Gas Flow
Possible Source of
Problem
Test
Solution
No or low purge gas
pressure See Section 9.2 above.
Purge gas manual
isolation valve(s) closed
or partially closed Check position of purge gas
manual isolation valve(s). Open fully.
Are any purge vent valves
open? Check position of all purge
vent valves. Close any purge vent
valves if open.
Instrument nitrogen
supply not adequate to
open purge gas pneumatic
valves Check instrument nitrogen
pressure. Adjust to 85-95 psig
(5.9-6.6 barg) if
necessary.