B-701964-00 Rev. C
Performance Verification
3-7
Companion 1000/T Liquid Oxygen System Technical Manual
3.4.3
Normal Evaporation Rate (NER) Test
The NER test measures the insulation efficiency of the Companion 1000/T Portable
liquid oxygen container. Test results are expressed in pounds (kilograms) of liquid
oxygen lost (that is, converted into gaseous oxygen and vented through the relief valve)
in a 24-hour period. This test is normally performed when one or more of the following
symptoms exist:
•
rapid loss of liquid oxygen contents from the container.
•
heavy condensation or frost on the container under no-flow conditions
•
excessive venting of gaseous oxygen through the relief valve.
PROCEDURE
1. Perform a leakage test (Section 3.2) on the Companion 1000/T Portable and verify
that the results are acceptable.
2. Perform the primary relief valve test (Section 3.3.2) to verify that the primary relief
valve is operating properly.
3. Set the flow control valve to 0 and fill the unit with liquid oxygen saturated at 22
psig (152 kPa).
4. Record the initial weight of the unit and the time.
5. After an elapsed time of 18 to 24 hours, record the weight and time.
6. The NER may be calculated using the following formula:
Verify that the NER is 1.5 lb/day (0.7 kg/day) or less.
At high flow rates, condensation and/or frost buildup may occur on portions of
the side covers and warming coil. This is not an indication of a high NER; rather,
it is caused by the high rate of heat transfer taking place in the heat exchange
coils.
Some venting of gaseous oxygen through the relief valve is normal.
NER (lb/day) / (kg/day)
= Initial Weight (lb/kg) — Final Weight (lb/kg)
X 24 hr
Elapsed Time (hr)
day
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