Taylor-Wharton XL-55 - Manual (Page 22)

then inspect your work.
The following chart is provided to give you some guidance in determining the probable
cause and suggested corrective action for some problems that may occur with cryogenic
liquid containers. This chart is specifically tailored to your XL-45, XL-50, or XL-55.
TROUBLESHOOTING CHART
Symptom Possible Cause Corrective Action
Consistently low 1. Relief valve open at low 1. Remove and replace relief
operating pressure. pressure. valve.
2. Economizer side of 2. Remove and replace
P.B./Economizer Regulator regulator.
stuck open.
3. Cold liquid. 3. Open pressure building valve.
With P.B. inoperative, the
container will build pressure
over time, or an external
pressure source can be used
to pressurize container.
No pressure shown 1. Bad container pressure 1. Remove and replace bad
on container gauge. gauge.
pressure gauge. 2. Open inner container 2. Remove and replace bursting
bursting disc. disc. Pressurize container
and check relief valve
operation.
3. Leaks in valves or 3. Leak test and repair leaks.
plumbing. For valve repairs, see
Maintenance section.
4. Cold liquid. 4. Open pressure building
circuit.
No pressure showing 1. Broken pressure gauge. 1. Replace pressure gauge.
but container is full 2. Vent valve open/P.B. 2. Close vent valve, open P.B.
by weight. valve closed. valve.
3. Faulty relief valve. 3. Replace relief valve.
Container full by 1. Liquid too cold. 1. Open P.B. valve or allow
weight and Liquid to stand.
Level Gauge but very 2. Possible leak in vent valve. 2. Rebuild valve.
low pressure 3. Faulty relief valve. 3. Replace valve.
TROUBLESHOOTING