What size nozzle is used by a Pitot Gauge to measure water flow?

• A. 1.5" nozzle
• B. 2" nozzle
• C. 2.5" nozzle
• D. 3" nozzle

Answer: (C)

The size of the nozzle used by a Pitot Gauge to measure water flow is typically 2.5 inches. This specific size allows for optimal flow measurement and accuracy when assessing the velocity of water in fire service applications. The nozzle is designed to create a jet that measures dynamic pressure, which is then used to calculate the flow rate of water.

Using the 2.5-inch nozzle ensures that the flow dynamics are sufficient to provide reliable and consistent readings, making it the standard size for this kind of measurement in water distribution systems and firefighting scenarios. Choosing a nozzle size too large or too small could lead to inaccurate flow measurements due to variations in water velocity and pressure. Hence, the 2.5-inch nozzle is widely accepted as ideal for this purpose.