Journeyman Plumber ExamPlumbing Code and RegulationsMedium
A plumber is preparing to perform a hydrostatic test on a newly installed sanitary drainage system in a multi-story commercial building. According to the International Plumbing Code (IPC), how long must the water be retained in the system for the test to be considered complete?
- A15 minutes
- B5 minutes
- C10 minutes
- D30 minutes
Show answer & explanationAnswer & explanation
Correct answer: A. 15 minutes
The IPC specifies that a hydrostatic test on a drainage system must hold water for a minimum of 15 minutes without any visible leaks. This duration allows sufficient time for any potential leaks to manifest under pressure.
Why the other options are wrong
- B. 5 minutes is typically too short for a reliable hydrostatic test on a drainage system.
- C. 10 minutes is often used for other types of tests, but not the standard for drainage system hydrostatic tests.
- D. 30 minutes would also pass the test but is longer than the minimum required, potentially wasting time.
Drainage System Hydrostatic Test Duration
The minimum time required for a newly installed drainage system to hold water without leaks during a hydrostatic pressure test.
- Ensures integrity of joints and pipes.
- Mandatory inspection requirement.
- Specific duration set by code.
Memory trick: Drainage test, hydrostatic hold, for fifteen minutes, stories told.