Which method is used to isolate ruptures in the firemain system?

• A. Segregate valves
• B. Close isolation valves on the opposite loop
• C. Replace the ruptured section with a spare
• D. Vent the area to release pressure

Answer: (A)

Isolating ruptures in the firemain is done by using segregate valves to shut off the damaged segment, effectively partitioning the firemain into intact sections. By closing the valves on either side of the rupture, the damaged portion is isolated from the rest of the system, preventing further loss of water and preserving pressure in the remaining loops for firefighting. Closing isolation valves on the opposite loop wouldn’t stop the leak in the ruptured section and could unnecessarily deplete another loop. Replacing the ruptured section is a repair action, not the immediate isolation step, and venting the area would release pressure but wouldn’t stop the leak or maintain system readiness.