Underground piping shall be tested for how many minutes?

Underground piping shall be tested for how many minutes?

• A. 15 minutes
• B. 30 minutes
• C. 45 minutes
• D. 60 minutes

Answer: (B)

Testing underground piping uses a hydrostatic method to verify there are no leaks and that joints and fittings hold pressure under load. The required duration for this test is thirty minutes, which provides enough time for any leaks to reveal themselves, including slow leaks at joints and connections. If the test is too short, small or slow leaks might go unnoticed; longer tests aren’t typically required and don’t add value for this purpose. Because underground piping in bulk-oil facilities carries flammable liquids, the hydrostatic test is done with water to minimize ignition risk while still pressurizing the system to reveal vulnerabilities.

Testing underground piping uses a hydrostatic method to verify there are no leaks and that joints and fittings hold pressure under load. The required duration for this test is thirty minutes, which provides enough time for any leaks to reveal themselves, including slow leaks at joints and connections. If the test is too short, small or slow leaks might go unnoticed; longer tests aren’t typically required and don’t add value for this purpose. Because underground piping in bulk-oil facilities carries flammable liquids, the hydrostatic test is done with water to minimize ignition risk while still pressurizing the system to reveal vulnerabilities.