Pitot Traverse Method: used to perform duct velocity or transport velocity survey, and static pressure. Which statement is correct?

Pitot Traverse Method: used to perform duct velocity or transport velocity survey, and static pressure. Which statement is correct?

• A. Measures face velocity at the hood
• B. Used to perform duct velocity or transport velocity survey as well as static pressure, Obtain an average by measuring velocity pressure at points in a number equal to the area cross section
• C. Detect leaks by listening for leaks
• D. Calibrate thermometers before use

Answer: (B)

Pitot traverse is a sampling approach used to determine how air moves through a duct by taking velocity-pressure measurements at multiple points across the duct cross-section and then averaging them to get the overall velocity (and thus the transport velocity). Because the speed of air isn’t the same everywhere in the duct, you don’t rely on a single point. Measuring velocity pressure at many points and converting each to a local velocity via the relationship between velocity pressure and velocity (from Bernoulli) lets you compute a representative average velocity. You also measure static pressure during the traverse to capture the pressure field in the duct. Together, these measurements yield the duct velocity (or transport velocity) and, with the cross-sectional area, the volumetric flow rate. This method is not about listening for leaks or calibrating thermometers.

Pitot traverse is a sampling approach used to determine how air moves through a duct by taking velocity-pressure measurements at multiple points across the duct cross-section and then averaging them to get the overall velocity (and thus the transport velocity). Because the speed of air isn’t the same everywhere in the duct, you don’t rely on a single point. Measuring velocity pressure at many points and converting each to a local velocity via the relationship between velocity pressure and velocity (from Bernoulli) lets you compute a representative average velocity. You also measure static pressure during the traverse to capture the pressure field in the duct. Together, these measurements yield the duct velocity (or transport velocity) and, with the cross-sectional area, the volumetric flow rate. This method is not about listening for leaks or calibrating thermometers.