Flow measurement

Introduction: What Does "Restriction Device" Mean? Imagine water or gas flowing through a pipe. We want to know exactly how much substance passes through it in an hour — not roughly, but fairly accurately. For this, we can use one of the oldest and most proven technologies — flow meters based on restriction devices. Simply put, we deliberately create an obstacle in the pipe that forces the flow to accelerate, and by measuring how much the pressure drops as a result, we calcul

Introduction In gas flow measurement, there is a pair of concepts, confusion between which can lead to financial losses, reporting errors, and serious technological miscalculations. These are m³/h and Nm³/h. At first glance, the difference seems formal — just an added letter "N" before the unit. However, behind this letter lies a fundamental distinction between two approaches to measuring gas flow, and a failure to understand this difference costs designers, operators, and ac

The accuracy of gas flow measurement directly depends on the flow profile at the installation point of the instrument. Any local flow disturbance — an elbow, tee, valve, or diameter transition — creates perturbations that distort the velocity profile. These distortions can persist for dozens of pipe diameters, and if a flow meter is installed in an unstabilized flow zone, measurement error can reach tens of percent. Therefore, the question of the required length of straight p