What term describes the protection that prevents excessive pressure when steam is admitted to the shell side before the tube side is opened?

What term describes the protection that prevents excessive pressure when steam is admitted to the shell side before the tube side is opened?

• A. Overpressure Protection
• B. Pressure Equalization
• C. Thermal Expansion Control
• D. Ventilation Protection

Answer: (A)

When steam is admitted to the shell side before the tube side opens, the shell can pressurize quickly because the steam has nowhere for the pressure to go until the tubes are ready to carry the flow. Overpressure protection is the safety mechanism that prevents the pressure from exceeding the vessel’s design limit by providing a relief path—such as safety valves, rupture disks, or vents—that activates at a set pressure. This directly addresses the risk of excessive pressure and keeps the equipment and operators safe. Other terms don’t fit as precisely: pressure equalization implies balancing pressures without addressing an overpressure scenario; thermal expansion control relates to movement from temperature changes rather than relieving excess pressure; ventilation protection isn’t a standard term for this context.

When steam is admitted to the shell side before the tube side opens, the shell can pressurize quickly because the steam has nowhere for the pressure to go until the tubes are ready to carry the flow. Overpressure protection is the safety mechanism that prevents the pressure from exceeding the vessel’s design limit by providing a relief path—such as safety valves, rupture disks, or vents—that activates at a set pressure. This directly addresses the risk of excessive pressure and keeps the equipment and operators safe.

Other terms don’t fit as precisely: pressure equalization implies balancing pressures without addressing an overpressure scenario; thermal expansion control relates to movement from temperature changes rather than relieving excess pressure; ventilation protection isn’t a standard term for this context.