29 trouble-remedy guide – Taylor-Wharton High Capacity GST Storage Tanks User Manual
Page 29
29
TROUBLE-REMEDY GUIDE
TROUBLE
POSSIBLE CAUSES
REMEDY
1.
Tank Pressure too low.
a.
Tank Pressure Relief Valve leaking
or frozen open.
b.
Tank Rupture Disc rupture.
c.
Piping leaks to atmosphere.
d.
Low liquid level.
e.
Excessive product withdrawal.
f.
Improper filling procedure.
a.
Thaw out valve or replace if
necessary. Refer to Step 5, this
section.
b.
Replace Tank Rupture Disc.
Refer to Step 6, this section.
c.
Test and repair tank
d.
Refill tank.
e.
Install higher capacity Pressure
Building Coil.
f.
Refer to filling instruction in
Operation Section.
2.
Excessive tank pressure.
a.
Extensive shutdown time.
b.
Low withdrawal rate.
c.
Malfunction of Pressure Building
Regulator.
d.
Malfunction of tank Pressure Gauge,
Inner Vessel.
e.
Lack of refrigeration caused by low
liquid level.
a.
No Remedy.
b.
No Remedy.
c.
Refer to Step 3, this section.
d.
Replace Pressure Gauge, Inner
Vessel.
e.
Refill tank.
3.
Malfunction of Back Pressure Valve.
a.
Improper valve set point.
b.
Dirt on valve seat or valve
component.
a.
Check valve set point reset if
required, follow in Resetting Control
Valves section.
b.
Disassemble, inspect, clean, and
reassemble per instructions of
manufacturer.
4.
Erratic or erroneous Liquid Level
Gauge readings.
a.
Leaking gauge lines.
b.
By-pass valve open.
c.
Liquid Level Gauge needle stuck.
d.
Liquid Level Gauge needle not zero
adjusted.
e.
Gauge line reversed.
f.
Liquid Level Gauge damaged or
faulty.
g.
Plugged gauge lines.
a.
Test and repair leaks.
b.
Close by-pass valve.
c.
Tap Liquid Level Gauge slightly,
Inspect needle and bend as required.
d.
Adjust as required.
e.
Connect properly.
f.
Replace Liquid Level Gauge.
g.
Disconnect lines at Liquid Level
Gauge and test for flow.
5.
Leaking safety valve.
a.
Dirt or ice under valve or disc.
b.
Improper valve set point.
c.
Damaged valve seat or disc.
a.
Thaw out valve. Replace if necessary.
b.
Replace valve.
c.
Replace valve.
6.
Ruptured Pressure Vessel Rupture
a.
Excessive tank pressure.
a.
Refer to Step 2, this section. Replace