Plumbers and pipefitters should ______ when replacing galvanized steel piping with PEX.

Plumbers and pipefitters should ______ when replacing galvanized steel piping with PEX.

• A. Replace the piping, then test pressure
• B. Check for leaks only
• C. Flush the system & check for leaks
• D. Tighten all clamps

Answer: (C)

When replacing galvanized steel with PEX, you want the system both clean and watertight. Flushing the system removes rust, sediment, and any debris from the old piping and fittings, and it helps purge air so the system can be filled properly. Once the lines are flushed and filled, you then check for leaks at every joint and connection under pressure to confirm the replacements are watertight. This approach prevents debris from causing clogs and ensures all fittings are secure before the system is put into service. Simply testing pressure without flushing can miss debris and potential leaks, and focusing only on tightening clamps won’t guarantee a leak-free, clean system.

When replacing galvanized steel with PEX, you want the system both clean and watertight. Flushing the system removes rust, sediment, and any debris from the old piping and fittings, and it helps purge air so the system can be filled properly. Once the lines are flushed and filled, you then check for leaks at every joint and connection under pressure to confirm the replacements are watertight. This approach prevents debris from causing clogs and ensures all fittings are secure before the system is put into service. Simply testing pressure without flushing can miss debris and potential leaks, and focusing only on tightening clamps won’t guarantee a leak-free, clean system.