What is the nominal diameter of the hydrant outlet used in the pitot gauge example?

What is the nominal diameter of the hydrant outlet used in the pitot gauge example?

• A. 3 in
• B. 4-1/2 in
• C. 6 in
• D. 8 in

Answer: (B)

When you’re using a pitot gauge to test hydrant flow, the size of the hydrant outlet matters because the gauge must fit into the outlet and measure velocity pressure without being distorted by a tight passage. The standard hydrant outlet used for pumpers and for flow testing is four-and-a-half inches in nominal diameter. This size provides enough clearance for the pitot head and allows water to flow past it with minimal obstruction, giving a reliable reading. Smaller hose outlets, like two-and-a-half inches, are intended for hoses and aren’t suitable for inserting the pitot device. Larger sizes such as six or eight inches aren’t the typical outlets used in this testing scenario. So, the hydrant outlet used in the pitot gauge example is four-and-a-half inches.

When you’re using a pitot gauge to test hydrant flow, the size of the hydrant outlet matters because the gauge must fit into the outlet and measure velocity pressure without being distorted by a tight passage. The standard hydrant outlet used for pumpers and for flow testing is four-and-a-half inches in nominal diameter. This size provides enough clearance for the pitot head and allows water to flow past it with minimal obstruction, giving a reliable reading. Smaller hose outlets, like two-and-a-half inches, are intended for hoses and aren’t suitable for inserting the pitot device. Larger sizes such as six or eight inches aren’t the typical outlets used in this testing scenario. So, the hydrant outlet used in the pitot gauge example is four-and-a-half inches.