Flow Measurement Conversion Chart PDF

Flow Measurements 1. Units of flow – Flow can be measured using volumetric flow rate or mass flow rate. Volumetric flow (Q) is defined as the volume of fluid that passes a given point in a pipe per unit of time. Q=vXA Mass flow rate (W) is defined as the mass or w...

Flow Measurements 1. Units of flow – Flow can be measured using volumetric flow rate or mass flow rate. Volumetric flow (Q) is defined as the volume of fluid that passes a given point in a pipe per unit of time. Q=vXA Mass flow rate (W) is defined as the mass or weight flowing per unit time. Typical units are pounds per hour. W=XQ multiply by Convert to Convert from US gpd US gpm cfm IMP gpd IMP gpm m3/s 22800000 15852 2119 19000000 13200 m3/min 380000 264.2 35.32 316667 220 m3/h 6333.3 4.403 0.589 5277.8 3.67 liter/sec 22800 15.852 2.119 19000 13.20 liter/min 380 0.2642 0.0353 316.7 0.22 liter/h 6.33 0.0044 0.00059 5.28 0.0037 US gpd 1 0.000695 0.000093 0.833 0.000579 US gpm 1438.3 1 0.1337 1198.6 0.833 cfm 10760.3 7.48 1 8966.9 6.23 Imp gpd 1.2 0.00083 0.00011 1 0.00069 Imp gpm 1727.3 1.2 0.161 1439.4 1 multiply by  Convert to Convert from 3 3 3 m /s m /min m /h liter/sec liter/min liter/h 3 m /s 1 60 3600 1000 60000 3600000 3 m /min 0.0167 1 60 16.67 1000 60000 3 m /h 0.000278 0.0167 1 0.278 16.67 1000 liter/sec 0.001 0.06 3.6 1 60 3600 liter/min 0.0000167 0.001 0.06 0.0167 1 60 -7 liter/h 2.7 10 0.000017 0.001 0.00028 0.0167 1 -8 US gpd 4.39 10 0.0000026 0.000158 0.000044 0.0026 0.158 US gpm 0.000063 0.00379 0.227 0.0630 3.785 227.1 cfm 0.00047 0.028 1.699 0.472 28.32 1698.99 -8 Imp gpd 5.26 10 0.0000032 0.000189 0.0000526 0.00316 0.1895 Imp gpm 0.000076 0.0046 0.272 0.076 4.55 272.7 2. Local Reference – Rotameters are used to indicate the actual flow rate. Some are using totalizer to measure the average flow rate for a certain period of time.  Remote Control – There are several methods on how to measure flow rate. Head Method or Differential Pressure Flowmeters - measure flow by inferring the flow rate from the drop in differential pressure (dP) across an obstruction in the process pipe. Some of the common dP flowmeters are orifice plates, venturi tubes, flow nozzles, wedge flow meters, pitot tubes, and annubars. Velocity Flowmeters - With velocity devices, the flow rate is determined by measuring the velocity of the flow and multiplying the result by the area through which the fluid flows. Typical examples of velocity devices include turbine, vortex shedding, magnetic, and Doppler ultrasonic flowmeters Displacement Method or Volumetric Flowmeter - flowmeters measure flow by measuring volume directly. Positive-displacement flowmeters use high-tolerance machined parts to physically trap precisely known quantities of fluid as they rotate. Common devices include rotary-vane, oval-gear, and nutating-disk flowmeters