Flow measurement Cảm biến lưu lượng

The participant knows… • … coriolis, electromagnetic, vortex and thermal flow measurement principle • …application and installation limits The participant understands… • …each measurement technology has different limitation • … appli ti d diti d i t ll ti cation and process conditions and installations are very important

Products Solutions Flow Measurement Slide / 76 13 October 2015 GBO Services 10/13/2015 Learning Objectives The participant knows… • … coriolis, electromagnetic, vortex and thermal flow measurement principle • …application and installation limits The participant understands… • …each measurement technology has different limitation • … application li ti and d process conditions diti and d iinstallations t ll ti are very important Slide / 76 13 October 2015 GBO 10/13/2015 The first step to find the solution • The first step in finding a solution for a flow metering point is finding the best suitable measuring technology • The selection is based on the requirements of the measuring point e.g.: Expecte d accurac y Require d tturndown Slide / 76 13 October 2015 Accepta ble pressur e loss Mass flow, di direct t or calculate d Installati on situation E Etc GBO 10/13/2015 Influences on the selection of the measuring system Liquid / Gas Mass or Volume Viscosit y Conduc C d tivity Abrasion Pressur e Corrosio n Density Price Best fit measuring system Accepte d pressure loss Temp Pipe inlet Pipe Homog eneity Slide / 76 13 October 2015 Disturb ances GBO Flow profile Turn down 10/13/2015 Rough classification of applications • Conductive liquids >80% of all liquids are conductive (Drinking- and waste water, beverages acids beverages, acids, alkalines alkalines, etc etc.)) • Non conductive liquids Oils, hydro carbons, liquefied gases, demineralized water • Gas Air, nitrogen, natural gas, biogas, etc • Steam Saturated and superheated steam • Special applications Abrasive slurries, custody transfer, measurement from outside, bidirectional, etc Slide / 76 13 October 2015 GBO 10/13/2015 Flow technologies overview Slide / 76 13 October 2015 GBO LU/MSA 10/13/2015 Application Range Slide / 76 13 October 2015 GBO 10/13/2015 Application Range 1000 Temp [°C] Differential Pressure 400 350 Vortex Coriolis 200 Magnetic Inductive pressure [bar] Ultrasonic Thermal 40 Slide / 76 13 October 2015 GBO 160 250 400 420 Products Solutions Flow Measurement – Coriolis Measurement Slide / 76 13 October 2015 GBO Services 10/13/2015 The Coriolis Measuring Principle Inventor of the measuring principle of the same name Caspard Gustave de Coriolis Slide 10 / 76 13 October 2015 GBO 10/13/2015 Basics of Vortex Flow Measurement f = Vortex frequency V = Volume flow f~V Slide 52 / 76 13 October 2015 GBO 10/13/2015 Installation Hints 3…5 x DN x DN 4…8 x DN Slide 53 / 76 13 October 2015 GBO 155 x DN x DN 50 x DN x DN x DN x DN 10/13/2015 Vortex flow meter advantages • Universal applicable for volumetric flow measurement of steam steam, liquids and gas gas • Largely unaffected by changes in pressure, temperature and viscosity • Simple and low cost installation • Low pressure drop • Wide measuring range • Independent of the process conditions and fluid • Long-term stability ( lifetime K factor) Slide 54 / 76 13 October 2015 GBO 10/13/2015 Vortex flow meter disadvantages • Pulsating flow and swirl have a detrimental effect on measuring accuracy • Long inlet and outlet runs necessary • Can not be used for highly viscous fluids • Measurement with low velocities not possible (Re