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3.3
GASEOUS OXYGEN TESTS
3.3.1
3.3.2
3-4 Performance Verification
4. Do not disturb the Companion 1000/T for 8 to 9 hours. At the end of this
evaluation period, verify the unit maintains at least 15 psig (104 kPa). Should the
pressure be less than 15 psig (104 kPa), repressurize the unit to approximately 22
psig (152 kPa) and locate the leak by testing all components, fittings, and tubing
with liquid leak detector. Make repairs as needed, taking care not to overtighten
connections.
Conduct the following tests on an empty unit that has warmed to room temperature.
Secondary Relief Valve Test
The secondary relief valve serves as a safety or backup to the primary relief valve. Under
normal operating conditions, the secondary relief valve remains closed. The relief valve
opens if the system pressure reaches 25 to 37 psig (172 to 255 kPa). This test uses
gaseous oxygen to determine if the secondary relief valve opens within its acceptable
range.
Refer to Figures 6-1, 6-2, 6-5 and 6-6 to identify parts with bold number references.
PROCEDURE
1. Connect the pressurizing setup to the Companion 1000/T (Figure 3-1).
2. Remove the silencer 6 from the primary relief valve 5.
3. Hold the primary relief valve closed while pressurizing the Portable. Increase the
pressure until the secondary relief valve 1 opens (audible hiss) between 25 to 37 psig
(172 to 255 kPa). If the secondary relief valve does not open within this range the
first time, repeat the procedure. If it fails to open within the acceptable range the
second time, replace the secondary relief valve (Section 5.8, Service and Repair).
Do not release the primary relief valve poppet until pressure in the unit is
reduced below 22 psig (152 kPa) by removing the pressurizing setup and
opening the vent valve. Replace the primary relief valve silencer.
Primary Relief Valve Test
The primary relief valve maintains system pressure at a preset value when the
Companion 1000/T Portable contains liquid oxygen. This test uses only gaseous oxygen
to determine if the primary relief valve opens within the acceptable range. Perform a
primary relief valve function test when the Portable contains liquid oxygen.
Refer to Figure 6-5 to identify parts with bold number references.
PROCEDURE
1. Connect the pressurizing setup to the Companion 1000/T (Figure 3-1).
2. Place one drop of Snoop on the silencer 6. Slowly pressurize the unit with gaseous
oxygen by adjusting the oxygen regulator.
3. Verify that the primary relief valve 5 opens (bubbles appear on silencer) at 20.5 to
24.0 psig (141 to 165 kPa). The primary relief valve vents through the silencer 6. If
the valve does not open within the specified range, replace the primary relief valve
(Section 5.7, Service and Repair).
Companion 1000/T Liquid Oxygen System Technical Manual
B-701964-00 Rev. C
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