Practice question

During an annual pump service test, what is the minimum acceptable result of the dry vacuum test?

  1. 20 in. Hg held for 5 minutes with no more than 10 in. Hg loss
  2. 22 in. Hg held for 5 minutes with no more than 10 in. Hg loss
  3. 29 in. Hg held continuously
  4. Any vacuum that primes within 30 seconds

Answer: B — 22 in. Hg held for 5 minutes with no more than 10 in. Hg loss

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