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What is the maximum allowable drop of the mercury column during a vacuum service test in five minutes?

5 inches.

10 inches.

In the context of vacuum service tests, the maximum allowable drop of the mercury column is set to ensure the integrity and safety of the system being tested. A drop of 10 inches is established as a standard limit, as this indicates that the vacuum system can maintain a sufficient level of vacuum without significant leaks or flaws present.

Allowing for a 10-inch drop reflects the operational capabilities of the equipment, confirming that it can sustain a reliable vacuum under normal conditions. This standard ensures that any potential issues can be detected during the test phase, which is critical for maintaining operational safety and effectiveness in real-world scenarios. Exceeding this limit could suggest a compromise in the vacuum system's integrity, potentially leading to operational failures.

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15 inches.

20 inches.

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