Which type of pressure is created on the walls of pipes or tanks holding water, as indicated by most gauges?

Static pressure is the appropriate type of pressure indicated by most gauges when measuring water held in pipes or tanks. This pressure refers to the pressure exerted by the fluid in a system when the fluid is at rest, meaning that there is no flow taking place. It is critical for understanding how much pressure is available for the operation of fire sprinkler systems, as it influences the effectiveness of the system in delivering water during an emergency.

Static pressure is relevant in the context of sprinkler systems because it determines the ability of the system to distribute water effectively throughout the network of pipes and onto the protected area. Knowing the static pressure helps in designing systems to ensure adequate pressure at all sprinkler heads for effective fire suppression.

In contrast, other types of pressure such as velocity pressure pertains to the kinetic energy of the fluid in motion, which is not what gauges typically indicate when dealing with stagnant water in pipes. Normal pressure is not a specific term used in this context, and residual pressure typically refers to the pressure remaining in a system when water is flowing, which is distinct from static pressure.