Which option describes the event associated with steam pocket collapse in piping systems?

Which option describes the event associated with steam pocket collapse in piping systems?

• A. Pressurized water entering a vertical steam-filled pipe (steam pocket collapse)
• B. Cause of Water Hammer
• C. Steam and water counterflow in a horizontal pipe
• D. Hot water entering a low pressure line

Answer: (A)

Steam pocket collapse happens when a vertical section of piping is filled with steam and cooler, pressurized water suddenly enters from below. The incoming water rapidly condenses the steam, causing the steam pocket to collapse quickly. This rapid condensation of steam generates a sharp pressure surge that travels through the liquid as a water-hammer-type event. So the described situation—pressurized water entering a vertical steam-filled pipe leading to a steam pocket collapse—best matches what occurs.

Steam pocket collapse happens when a vertical section of piping is filled with steam and cooler, pressurized water suddenly enters from below. The incoming water rapidly condenses the steam, causing the steam pocket to collapse quickly. This rapid condensation of steam generates a sharp pressure surge that travels through the liquid as a water-hammer-type event. So the described situation—pressurized water entering a vertical steam-filled pipe leading to a steam pocket collapse—best matches what occurs.