For single air systems (pre-1975), the pressure buildup from 50 to 90 psi must be within:

3 minutes.. Section 5.4: For older single systems, 3 minutes is allowed to build from 50 to 90 psi.

For single air systems (pre-1975), the pressure buildup from 50 to 90 psi must be within:

ANSWER BREAKDOWN
  • A. Correct. For older single systems, 3 minutes is allowed to build from 50 to 90 psi.
  • B. Incorrect. "2 minutes." is not correct. For older single systems, 3 minutes is allowed to build from 50 to 90 psi.
  • C. Incorrect. "4 minutes." is not correct. For older single systems, 3 minutes is allowed to build from 50 to 90 psi.
  • D. Incorrect. "1 minute." is not correct. For older single systems, 3 minutes is allowed to build from 50 to 90 psi.