Miscellaneous Mechanical Components
Pressurizer operation, including spray and heater operation, is usually automatically controlled.
Monitoring is required in the event the control features fail, because the effect on the system
could be disastrous without operator action.
The important information in this chapter is summarized below.
Two types of pressurizers -- static and dynamic
Purposes of a pressurizer:
Maintains system pressure above saturation
Provides a surge volume for system expansion and contraction
Provides a means of controlling system pressure
Provides a means of removing dissolved gases
A spray nozzle is a device located in the top of the pressurizer, used to atomize
incoming water to increase the effects of spraying water into the top of the
pressurizer to reduce pressure by condensing steam.
Insurge is the volume absorbed within the pressurizer during a level increase to
compensate for a rise in the system's temperature.
Outsurge is the volume released from the pressurizer during a level decrease to
compensate for a reduction in the system's temperature.
The surge volume is the volume of water that accommodates the expansion and
contraction of the system, and is designed to be typical of normal pressurizer