During inspection of a medical vacuum system receiver, the inspector finds heavy oily residue inside the tank. What does this indicate and what action is required?
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A
Normal condensation; wipe clean and continue operation
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B
Oil carryover from the vacuum pumps, requiring investigation of pump seals and receiver cleaning
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C
Moisture ingress from the piping system; increase vacuum level
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D
A sign that the system is operating efficiently; no action needed