Hydrostatic testing for common extinguishers is required every five years.

Hydrostatic testing for common extinguishers is required every five years.

• A. Every year
• B. Every two years
• C. Every three years
• D. Every five years

Answer: (D)

Hydrostatic testing checks the strength of the extinguisher cylinder by applying high pressure to make sure the vessel can safely contain the rated contents. For most common extinguishers, this test is required every five years. That interval reflects how the internal walls can develop corrosion or fatigue over time, which the test is designed to reveal, while keeping the process reasonably infrequent and costly. In between hydrostatic tests, you perform regular inspections and maintenance to ensure the extinguisher is charged, unobstructed, and in good condition. When the five-year test is due, the extinguisher is taken out of service, emptied, subjected to the hydrostatic pressure test, and then recharged and returned to service if it passes.

Hydrostatic testing checks the strength of the extinguisher cylinder by applying high pressure to make sure the vessel can safely contain the rated contents. For most common extinguishers, this test is required every five years. That interval reflects how the internal walls can develop corrosion or fatigue over time, which the test is designed to reveal, while keeping the process reasonably infrequent and costly. In between hydrostatic tests, you perform regular inspections and maintenance to ensure the extinguisher is charged, unobstructed, and in good condition. When the five-year test is due, the extinguisher is taken out of service, emptied, subjected to the hydrostatic pressure test, and then recharged and returned to service if it passes.