How often should a dry standpipe system be hydrostatically tested?

How often should a dry standpipe system be hydrostatically tested?

• A. Annually
• B. Every 2 years
• C. Every 3 years
• D. Every 5 years

Answer: (D)

Dry standpipe systems are not kept full of water all the time, so their piping can develop corrosion or leaks over years. A hydrostatic test checks the system’s ability to hold pressure and reveals weaknesses by filling the piping with water and raising the pressure above normal service. The standard practice is to perform this test every five years, which balances safety with practical maintenance workload. Annual testing would be unnecessarily frequent, while waiting longer could allow hidden deterioration to go undetected. Therefore, a five-year interval is the correct requirement.

Dry standpipe systems are not kept full of water all the time, so their piping can develop corrosion or leaks over years. A hydrostatic test checks the system’s ability to hold pressure and reveals weaknesses by filling the piping with water and raising the pressure above normal service. The standard practice is to perform this test every five years, which balances safety with practical maintenance workload. Annual testing would be unnecessarily frequent, while waiting longer could allow hidden deterioration to go undetected. Therefore, a five-year interval is the correct requirement.