Before patching a ruptured pipe, the section should be isolated. True or false?

• A. Isolate the section before patching
• B. Patch first, then isolate
• C. Ignore and patch later
• D. Ventilate and patch

Answer: (A)

Isolating the ruptured section before patching is essential for a safe, effective repair. Closing the valves that feed the damaged segment stops the flow of water, steam, or other contents, which reduces the risk of further spraying, flooding, or scalding while you work. With the section isolated, the area becomes safer and more controlled, making it possible to apply the patch properly and let it seat without being driven off by moving fluid or pressure. After isolation, you can drain or vent the line as needed and then perform the patch and secure it. Attempting to patch a live, pressurized line allows continuous leakage, increases the chance the patch won’t hold, and endangers the crew. Options that skip isolation or focus only on ventilation do not provide the necessary control to complete a reliable repair.