The flow of all fluids, whether liquid or gas, will have one of three states: laminar, turbulent, and transitional. This article discusses flow principles and pressure-based flow measurement. Laminar ...

Version 4 of the Bell & Gossett System Syzer® program for PC computers is available. It is an update of a tool for calculating flow rates and pressure drops in HVAC piping systems. The program ...

Pressure drop is determined by calculating the difference between the pressure of the gas when it enters the instrument and the pressure of the gas when it leaves the instrument. The measurements can ...

Where Q = volumetric flow rate; G L = liquid specific gravity (water = 1.00); ∆P = pressure differential across the valve; and N 1 = units constant (see table 1). Note that the pressure drop used in ...

In this method, attributed to F.C. Yu, the control valve in a pumped application is assigned a minimum pressure drop at maximum design flow rate and maximum 80% control valve open position ...

Whereas one group of devices relies on the principle of flow measurement, the other group is based on pressure drop measurements. The following report compares the accuracy of the two test methods, ..

The application of Equation 1 with English units, as shown in Equation 8, results in a gas flow rate of 5.504 MMscfd, a 9% difference. Discharge coefficient. The model calculates theoretic flow rates.