The sections of piping immediately upstream and downstream of a primary flow measuring device are commonly referred to as "Straight Run Requirements" or "Straight Length Requirements."
What are the sections used for?
These sections of piping are necessary to ensure proper and accurate measurement by the flow meter or primary flow measuring device. They allow the flow of fluid to stabilize, ensuring a uniform and steady flow profile before the fluid enters the device for measurement.
The purpose of these straight run requirements is to minimize disturbances, turbulence, or irregularities in the flow