Study On Measurement Accuracy Of Turbine Flowmeter In Different Installation Conditions Of Offshore Oil Platform

The flow is one of the important control parameters in industrial and agricultural production process.The flow measurement plays an important role in the iron and steel,metallurgy,petrochemical,food production,pharmaceuticals,aerospace and other industries.In all types of flowmeter,the turbine flowmeter has been widely used in the offshore oil platforms.However,the turbine flowmeter installation always could not meet requirements recommended by design manual because of the limited space on the offshore oil platforms.So the measurement accuracy of turbine flowmeter in different installation conditions is studied in this paper,according to the experimental data.Firstly,the development history,operating principle,operating conditions and offshore oil platform typical applications of turbine flowmeter are introduced in the paper.Secondly,experiment hardware and software is designed in the paper.The turbine flowmeter installation conditions are changed by different flow development length and restricted devices.It is studied in the paper that how the tutbine flowmeter measurement accuracy will be changed when front flow development length is 20 D,10D,5D,2D and rear flow development length is 5D,2D.It is studied in the paper that how the tutbine flowmeter measurement accuracy will be changed when there are six different upstream restricted devices of ball valve + 90° elbow + necking + 90° elbow,ball valve + 90° elbow + necking,ball balve+ necking,ball vavle+ 45° double elbows,ball valve + 90° bend head,ball valve + 90° double elbows and front flow development length is 20 D,10D,5D,2D.According to the experimental data and evaluation parameter,how the tutbine flowmeter measurement accuracy will be affected could be confirmed.Finally,compared with the experimental data of flow development length and restricted devices,the best upstream and downstream flow development length of turbine flowmeter and turbine flowmeter installation recommended practices are given in the paper.When there is no upstream restricted device and absolute length is not less than 4D,turbine flowmeter measurement accuracy will be 0.5%.When there are upstream restricted devices and absolute length is not less than 7D,turbine flowmeter measurement accuracy will be 0.5%.