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4.
a. If the leakage rate is less than 0.05 in. Hg (.17 kPa) in 24 hours, the machine is suffi-
ciently tight.
b. If the leakage rate exceeds 0.05 in. Hg (.17 kPa)
in 24 hours, repressurize the vessel and
test for leaks. If refrigerant is available in the other vessel, pressurize by following Steps
2-10 of Return Refrigerant to Normal Operating Conditions section. If not, use nitrogen
and a refrigerant tracer. Raise the vessel pressure in increments until the leak is
detected. If refrigerant is used, the maximum gas pressure is approximately 120 psig
(827 kPa) for HCFC-22, 70 psig (483 kPa) for HFC-134a at normal ambient temperature.
If nitrogen is used, limit the leak test pressure to 230 psig (1585 kPa) maximum.
5. Repair leak, retest, and proceed with dehydration.
Click here for Figure 27 — Typical Optional Pumpout System Piping Schematic with
Storage Tank
Click here for Figure 28 — Typical Optional Pumpout System Piping Schematic with-
out Storage Tank