Groth 3000 Series - Manual (Page 11)

8
TROUBLESHOOTING GUIDE
PROBLEM INSPECTION SUGGESTED CORRECTIVE ACTION
Gas flowing at tank
pressure above
specified set point.
Flow indicator in
blanket gas line. Damaged seat, O-Ring or diaphragm or pressure
setting too high. If original pressure setting has
not been disturbed, remove regulator and repair.
Gas not flowing at
tank pressure below
specified set point.
Flow indicator in
blanket gas line. Damaged spring or pressure setting too low. If
original pressure setting has not been disturbed,
remove regulator and repair.
Gas leaking from
upper vent or bonnet
flange.
Soap bubble test
and joining
surface or
emission
indication near
vent.
Damaged upper piston diaphragm. Remove
regulator from tank and replace diaphragm.
Diaphragm installed incorrectly. Reinforcement
fabric must be opposite to pressure (see page
13).
Gas leaking from
lower body seal or
case vent.
Soap bubble test at
joining surface or
emission
indication near
vent. Damaged lower piston diaphragm. Remove
regulator from tank and replace diaphragm.
Diaphragm installed incorrectly. Reinforcement
fabric must be opposite to pressure (see page
13).
Process vapor leaks
from case flange or
vent.
Soap bubble test at
joining surface or
emission
indication near
vent.
Damaged actuator diaphragm or loose case bolts.
Tighten bolts or remove regulator from tank and
replace diaphragm.
Tank pressure above
or below specified
operating range
during pump out or
pump in.
Observe tank
pressure indicator
during pumping
operations. Excess or insufficient blanket gas flow. Check
flow orifice orientation. Refer to Tables 2 & 6
for flow capacity data. Check gas supply
pressure. Remove and repair regulator if other
conditions are correct.
Tank pressure or
vacuum exceeds vent
settings during pump
out or pump in.
Observe tank
pressure indicator
during pumping
operations. Pressure/vacuum relief vent not functioning
properly. Inspect and repair or replace as
necessary.