EVAPORATION LOSS TEST (BUILDUP AND SUPPLY MODE)

To perform the evaporation loss test in the buildup and supply mode, proceed as follows:

1. At the end of the 1 hour period, gently place the converter on the scales and record its weight and the start time in the spaces provided on section 8 of the Performance Test Sheet.

2. Place the converter assembly aside again and allow it to remain undisturbed for 24 hours.

3. At the end of the 24-hour period, carefully replace the converter on the scales.

4. Record the time and weight in the spaces provided on the Performance Test Sheet. The 24 hour weight loss must be less than 3 pounds. There should not be a heavy coat of frost on the sphere.

5. If the weight loss was 3.0 pounds or less,and there was not excessive frosting of the sphere assembly, proceed to the flow test. If the loss was more than 3.0 pounds, proceed to the EVAPORATION LOSS TEST.

EVAPORATION LOSS TEST (VENTED MODE)

Maximum allowable loss of LOX in 24 hours is 5.0 pounds. Minimum allowable loss is defined as the weight recorded during the buildup and supply mode minus 0.5 pound (performed only if converter fails evaporation loss test in buildup and supply mode).

To perform the evaporation loss test in the vented mode, proceed as follows:

1. With the converter still on the scales, attach the test stand fill valve adapter (P/N 59A120-D5-10) to the fill, buildup, and vent valve on the converter.

WARNING

VENTING A CONVERTER THAT IS IN A BUILDUP AND SUPPLY MODE CAUSES A BLAST OF LOX FROM THE VENT PORT. ENSURE THAT VENT BLAST IS DIRECTED AWAY FROM ALL PERSONNEL, AND THAT ADEQUATE CLOTHING AND FACIAL PROTECTION ARE WORN.

2. Turn the knurled knob of the adapter in until it seats. This places the converter in the vented mode.

3. Record the time and weight in section 9 of the Performance Test Sheet.

4. Place the converter aside and allow it to remain undisturbed in the vented mode for 24 hours.

5. At the end of the 24-hour period, carefully replace the converter on the scales.

6. Record the time and the converter weight on the Performance Test Sheet. Weight loss in 24 hours should not exceed 5.0 pounds for this test to be satisfactory.

7. If the weight loss is too much, locate the probable cause by using the troubleshooting chart in table 12-22.

Table 12-22.-Troubleshooting (Evaporation Loss Test)

Table 12-23.-Troubkshooting (Flow Test)

8. Remove the fill valve adapter you installed in step 1.

FLOW TEST

To perform the flow test, proceed as follows:

1. Secure the converter in the rack on the test stand countertop.

2. Using the Test Stand Hose Assembly, P/N 59A120-B5-12, connect the test stand FLOWMETER CONNECTION, NIP-4, to the CONVERTER SUPPLY OUTLET CONNEC-TION, NIP-5.

3. Using the Test Stand Hose Assembly, P/N 59A120-B5-47, connect the test stand SUPPLY TO CONVERTER CONNECTION, NIP-6, to the converter quick-disconnect coupling.

4. Place the test stand FLOWMETER SELECTOR valve V-1 in the 0-150 1pm position. Open the TEST PRESSURE GAUGE BUILDUP AND FLOW valve V-10. You should not have a reading of over 70 psig on the test pressure gauge PG-1. If the test pressure gauge reads over 70 psig, vent the converter system pressure to 70 psig (refer to NAVAIR 13-1-6.4).

5. Open the test stand CONVERTER SUP-PLY FLOW CONTROL valve, V-9, to give a flow of 120 1pm as indicated on the FLOWMETER INDICATOR gauge, PG-2. Maintain the flow for a minimum of 15 minutes.

6. While maintaining a 120 1pm flow, the converter should maintain pressures of 55 to 90 psig as indicated on the TEST PRESSURE gauge, PG-1. Record the high and low pressures in the indicated blocks in section 10 of the Performance Test Sheet.

7. If the converter supply pressure is not within limits, locate probable cause using the troubleshooting chart (table 12-23).

8. Continue flowing the converter until it is completely empty of LOX. Any means of evacuating LOX from the converter is acceptable, provided all safety precautions are followed.

9. Disconnect the test stand hose assemblies, which you attached in steps 2 and 3. Close all test stand valves.