When testing fire hose, important to:

• A. Close valves slowly to prevent water hammer
• B. Open valves quickly to test quickly
• C. Test at maximum pressure
• D. Submerge the hose before test

Answer: (A)

Preventing a pressure surge during hose testing is essential. Closing valves slowly avoids water hammer, the sudden spike in pressure that occurs when a valve is shut quickly. This gradual closure keeps the hose, couplings, and fittings from experiencing damaging shock and helps protect personnel from injury.

Opening valves quickly would cause that dangerous surge, which is why it’s not recommended. Testing at maximum pressure beyond the hose’s rated working pressure risks over-stressing and possible failure, so tests are done at the rated pressure. Submerging the hose before or during testing isn’t part of standard procedure and can complicate readings or introduce contaminants.