The three parts of the pressure control test require you to close the flowing valves one at a time in no less than how many seconds and no more than how many seconds?

• A. 1-3 seconds
• B. 10-20 seconds
• C. 3-10 seconds
• D. 20-30 seconds

Answer: (C)

When performing the pressure control test, you close each flowing valve in a controlled, gradual way to prevent sudden pressure changes and to let the system settle so readings reflect true behavior. The required window is 3 to 10 seconds for each valve. Closing faster than 3 seconds can cause a water hammer or pressure spike that could damage components or skew measurements. Closing slower than 10 seconds prolongs the test and can hide issues or lead to unnecessary delays. So, each valve should be closed within 3 to 10 seconds to balance safety, accuracy, and efficiency.