Real flow calibration of gas ultrasonic flowmeter scale and field application

Abstract: the real flow of gas ultrasonic flowmeter scale calibration and field application information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. Pick to in gas field, there are many factors affected the accuracy of trade settlement. These effects are not in accordance with the requirements of measurement standard can be controlled, such as: temperament condition or installation. So some new type of flowmeter ( Such as ultrasonic flow meter) It should. More flow meter manufacturers choose model price quote you are welcome to inquire, here is the real flow calibration of gas ultrasonic flowmeter scale and field application the article details. Pick to in gas field, there are many factors affected the accuracy of trade settlement. These effects are not in accordance with the requirements of measurement standard can be controlled, such as: temperament condition or installation. So some new type of flowmeter ( Such as ultrasonic flow meter) Was born and has been tested at calibration station. Through natural gas flow metering station of China's oil industry gas solid flow test and field application, proved that measurement accuracy of ultrasonic flowmeter can better & plusmn; 0. 5%, with high accuracy and good repeatability, range than wide, strong anti-jamming capability, small amount of maintenance and measurable two-way flow, etc. It is well known that the throttling orifice plate flowmeter device, guide of pressure pipeline system, differential pressure gauge. Characterized by range than smaller, pressure loss is big, the pulsating flow is very sensitive, can not be two-way flow measurement, etc. Although the orifice meter has hundreds of years of history, but as a result of measuring instrument error ( The throttle device design, manufacture, installation and use of the conditions do not conform to the ISO5167 - 1 [ 1] Request, or incorrect instrument) And conditions of use change error ( A long time, the change of flow rate is beyond the scope of the selected instrument measurement, or the generation of pulsating flow) , often make the accuracy of orifice flowmeter can't better than & plusmn; 1. 5%. Although the ISO/TR3313 [ 2] Has inhibition of pulsating flow and error estimates provide some data for the user to use reference, but to meet the need of the field there are still many shortcomings: (1) in the field of choke type than standard, and choke a kaleidoscope of combination, so the site is still some problems to be solved ( Such as cyclone separator, manifold, there is no provision in standard) ； (2) experimental study on the need to spend a lot of manpower and material resources; (3) the rectifier to shorten the length of straight pipe will bring pressure loss, it will also increase the use of maintenance work. Orifice plate is not suitable for pulsating flow measurement, due to the differential pressure signal and flow for the non-linear relations, bring pressure pipeline that signal delay and distortion, throttling a obstacle on pulse wave form of wave reflection, etc. [ 3] 。 Due to the factors affected the accuracy of orifice flowmeter trade settlement, caused by natural gas transmission measurement error is above 2%. How to improve and enhance the precision of the gas metering system are a common concern of the industry, and the corresponding development of a large number of new type flowmeter. In many flowmeter, through China's natural gas flow metering station ( Hereinafter referred to as the metering station) Gas solid flow test and field application, to prove, intelligent vortex precession flowmeter, ultrasonic flowmeter effect is good, is worth promoting. Natural gas flow metering station situation of natural gas flow metering station of China's oil industry is Asia investment scale zui large natural gas metering station, have quality time method ( 太) Primary standard system ( The uncertainty of 0. 1%) And critical flow venturi nozzle secondary standard system ( The uncertainty of 0. 25%) 。 Set pressure range: 0. 2 ~ 3. 8 mpa, calibration condition flow range: 5 ~ 6000 m3 / h. Pipe diameter range: DN25 ~ DN400. So far, to the United States, the Netherlands, Germany, Singapore, China and other countries and comparing various flowmeter has carried on the real flow calibration, accumulated tens of thousands of experimental data.

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