There are many kinds of natural gas flowmeters in China, so it becomes a problem for the general users to choose the type.How to select the best flowmeter scientifically and objectively is a problem that needs attention.In our opinion, the selection should follow proper rules, avoid the misleading propaganda of the manufacturers, and find a proper flowmeter for ourselves, which is our own natural gas flowmeter.The selection of natural gas flowmeter can be carried out in five aspects: instrument performance, fluid characteristics, installation conditions, environmental conditions and economic factors.The considerations are as follows:

First,Natural gas flow meter performance: accuracy, repeatability, linearity, range, pressure loss, upper and lower limit flow, signal output characteristics, response time, etc;

Second,Fluid characteristics of natural gas flowmeter: fluid pressure, temperature, density, viscosity, lubrication, chemical properties, wear, corrosion, scale, dirt, gas compression coefficient, isentropic index, specific heat capacity, conductivity, sound speed, miscible flow, pulsating flow, etc;

Thirdly,Installation conditions of natural gas flowmeter: pipeline layout direction, flow direction, upstream and downstream pipeline length, pipeline diameter, maintenance space, pipeline vibration, grounding, power supply, auxiliary equipment (filtration, sewage discharge), explosion protection, etc;

Fourthly,Environmental conditions of natural gas flowmeter: environmental temperature, humidity, safety, electromagnetic interference, etc;

Fifth,Economic factors of natural gas flowmeter: purchase cost, installation cost, maintenance cost, check cost, service life, operation cost (energy consumption), spare parts, etc.