How long should headers be flushed during testing?

How long should headers be flushed during testing?

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

Answer: (A)

When flushing headers during testing, the goal is to purge any air and fill the entire header with water so leaks can be seen and the flow is being tested accurately. Thirty seconds provides enough time for water to circulate through all parts of the header and push air out of outlets, giving a reliable indication of the system’s condition. If you flush for too short a time, air pockets may remain and mask leaks or distort readings; flushing longer doesn’t add value for this step and just delays the test.

When flushing headers during testing, the goal is to purge any air and fill the entire header with water so leaks can be seen and the flow is being tested accurately. Thirty seconds provides enough time for water to circulate through all parts of the header and push air out of outlets, giving a reliable indication of the system’s condition. If you flush for too short a time, air pockets may remain and mask leaks or distort readings; flushing longer doesn’t add value for this step and just delays the test.