Taylor-wharton XL-55HP (with dual regulators) Manuel d'utilisateur télécharger pdf (Page 22)

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 cryo-

genic liquid containers. This chart is specifically tailored to your XL-45HP, XL-50HP, XL-

55HP or XL-50VHP.

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. Pressure drop to below 1. Re-pressurize with C0

gas

but container is full 70 psig (4.8 bar/483 kPa) and check for leaks. Repair

by weight. has caused contents to leaks, re-pressurize to relief

freeze solid. Check pres- valve setting and allow to set

sure gauge (C0

only). until contents re-liquefy.

2. Broken pressure gauge. 2. Replace pressure gauge.

3. Vent valve open/P.B. 3. Close vent valve, open P.B.

valve closed. valve.

4. Faulty relief valve. 4. 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

For containers in C02 service, see caution on releasing container pressure at the beginning of the

Maintenance section.

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Taylor-wharton XL-55HP (with dual regulators) Manuel d'utilisateur Page 22

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