Sample interview questions: Can you discuss your knowledge of water hammer prevention and mitigation in commercial plumbing?
Sample answer:
Water Hammer Prevention and Mitigation
Understanding Water Hammer
- Sudden pressure surges in water supply lines caused by abrupt closing of valves or fixtures.
- Occurs when flowing water encounters resistance and creates momentum that impacts the piping system.
Prevention Techniques
- Air Chambers: Install air chambers at the end of long pipe runs to absorb pressure surges.
- Hammer Arrestors: Use hydraulic devices that absorb and release pressure, preventing shock waves.
- Expansion Tanks: Incorporate expansion tanks in closed water systems to accommodate volume changes and reduce pressure build-up.
- Slow-Closing Valves: Install valves that close gradually to minimize pressure surges.
- Proper Pipe Sizing: Design the piping system with appropriate diameters to avoid excessive flow velocities and reduce pressure spikes.
Mitigation Strategies
- Valve Selection: Choose valves with smooth operating mechanisms and low closure rates.
- Pipe Alignment: Align pipes carefully to minimize friction and abrupt changes in direction.
- Water Column Clamps: Ins… Read full answer
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