What is static pressure in a water system?

What is static pressure in a water system?

• A. The pressure in the system when no water is flowing
• B. The remaining pressure in the system while water is flowing from a hydrant
• C. The ratio of the density of a substance to the density of a standard
• D. A mental calculation shortcut to estimate friction loss

Answer: (A)

Static pressure is the pressure in a water system when no water is moving. It represents the potential energy in the pipes and is what a gauge reads with the hydrant or valve shut. Once water flows, friction and fittings reduce pressure, so the pressure you see during flow is called residual (or flowing) pressure. The other options describe pressure during flow, a density ratio, or a shortcut for calculating friction loss, none of which define static pressure.

Static pressure is the pressure in a water system when no water is moving. It represents the potential energy in the pipes and is what a gauge reads with the hydrant or valve shut. Once water flows, friction and fittings reduce pressure, so the pressure you see during flow is called residual (or flowing) pressure. The other options describe pressure during flow, a density ratio, or a shortcut for calculating friction loss, none of which define static pressure.