Air Products GASGUARD TE10, Installation, Operation And Maintenance Manual

Page: 160 / 196

GASGUARD
®
TE10 Distribution System Manual
Air Products and Chemicals, Inc. 9 - 6
9.4 No or Low Process Gas Pressure
Possible Source of
Problem
Test
Solution
Closed manual process
gas inlet valve to
distribution system. Check position of manual
process gas inlet valve. Open manual process gas
inlet valve, pressure
should indicate source
delivery pressure.
Low process gas inlet
pressure Check process gas inlet
pressure. Increase process gas inlet
pressure from source.
Instrument nitrogen
supply not adequate to
open process pneumatic
valves Check instrument nitrogen
pressure. Adjust to 85-95 psig
(5.9-6.6 barg) if
necessary.
Process 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.
9.5 No or Low Process Gas Inlet Flow
Possible Source of
Problem
Test
Solution
No or low process gas
pressure See Section 9.4 above.
Process gas manual
isolation valve(s) closed
or partially closed Check position of process
gas isolation valve(s). Open fully.
Are any vent valves open? Check position of all vent
valves.
Close any vent valves if
open.
Are process gas
pneumatic valves
receiving sufficient
pressure to open? Check if instrument supply
is adequate. Adjust to 85-95 psig
(5.9-6.6 barg) if
necessary.