Abstract: the scale of the differential pressure type gas flowmeter selection information produced by excellent
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Metering device and the application case of differential pressure type gas flowmeter selection hai-yan hu (
Shengli oilfield mouth production technology testing station metering station, shandong estuary differential pressure type gas flowmeter is a kind of gas meter, zui widely in all kinds of flow meters in its usage.
More flow meter manufacturers choose model price quote you are welcome to inquire, here is a differential pressure type article details in the selection of gas meter scale.
Metering device and the application case of differential pressure type gas flowmeter selection hai-yan hu (
Shengli oilfield mouth production technology testing station metering station, shandong estuary differential pressure type gas flowmeter is a kind of gas meter, zui widely in all kinds of flow meters in its usage, occupy the first place, based on tank flow meter, V cone flowmeter and vortex precession flowmeter as an example, the selection of differential pressure type gas flowmeter is introduced how to and should pay attention to the problems in type selection.
Differential pressure type gas flowmeter;
Selection;
Instrument performance of natural gas is under pressure of pipeline, the traffic is aimed at a cross section through a pipe.
The amount of gas, between supply and demand both sides is through the path of the flow measurement device installed in pipeline measurement data.
The flow rate measurement data is also measured unit production technical level is an important basic data.
Accurately carry on the economic analysis for gas flow measurement is the corporate sector, a key link to reduce operation cost, a direct impact on the economic benefits of enterprises, closely focus on supply and demand, as the world increasingly tense energy supply and demand, people are very concerned about and to seek a kind of high precision, strong adaptability flow meter to measure gas flow rate.
1 differential pressure flowmeter to differential pressure type gas flowmeter development though today is increasingly mature, but its still very wide range, and the performance is different.
Until the 1950 s, differential pressure flowmeter is * gas flowmeter, the flow meter accounts for about 50% to 60% of the total sales of about 40% in China.
It is according to the installation in pipe flow test of differential pressure, the fluid known conditions and geometry size of test pieces and pipes to measure the flow meter, it has a long history and mature practice experience, the perfect standard specification (
Except velocity-equalizing tube)
Varieties complete specifications of flowmeter, it also has a simple structure, durability, versatility, low cost, standard throttling parts without actual flow calibration, etc.
Differential pressure flowmeter has many shortcomings, demand is high, its installation conditions require a long straight pipe, the whole set of flowmeter accuracy also depends on the differential pressure transmitter and flow detection accuracy, it is a kind of from design, manufacturing to installation is very strict to use instrument, in any link mistakes will produce great error;
In addition, the differential pressure flow meter output signal and flow for the square, is a nonlinear instrument, range of degrees narrower;
The pressure loss is also one of its weaknesses.
Aiming at the shortcoming, in recent years, domestic manufacturers to launch a series of improvement measures, such as one-piece differential pressure flowmeter, fixed value throttling pieces, can change, with a standard nozzle orifice throttling device and so on, combined with differential pressure flowmeter after 80 s composed of two parts: differential pressure transmitter and flow display, have made outstanding progress, estimates that this kind of flowmeter will still occupy the important position in the future.
Tank flow meter, V cone flowmeter and vortex precession flowmeter is a new type of flowmeter in three representative, they belong to a differential pressure type flowmeter.
2 classification of differential pressure flowmeter range differential pressure type flowmeter, according to different classification method, 20 types can be divided into three broad categories.
Specific classification are shown in table 1 to table 1 classification classification principles of differential pressure flowmeter classification type throttle type;
Dynamic head type;
According to produce differential pressure (
3)
Principle of hydraulic resistance type classification (
4)
The centrifugal;
Type fluidic dynamic pressure gain standard orifice plate;
Standard nozzle;
Classic venturi tube;
Venturi nozzle cone inlet orifice plate;
1/4 round orifice plate;
Segmental orifice plate;
The eccentric orifice plate;
According to the classification of structure form (
9)
Wedge orifice plate;
As a whole (
Hide)
Orifice plate;
Linear orifice plate;
Circular orifice plate;
Doyle tube;
Rollo, tube;
Bend;
To change the orifice throttling device;
Hai-yan hu critical flow throttling device (
1979 -)
Female, shandong zhanhua people, engineer, graduated from China university of petroleum, work in the measuring technique.
Continue table type classification principle classification standard throttle device;
Low Reynolds number throttling device;
Dirt flow throttling device;
Classification according to the use of low pressure loss throttling device;
Small diameter throttle device;
Wide range of degree of throttle device;
Critical flow throttling device 3 differential pressure flowmeter selection with the development of science and technology, and many of the new type of flowmeter.
However due to the breadth of natural gas flow measurement technology, the use of different objects, have different requirements for flow meter, that is to say, objectively a variety of flow meter, can meet the requirements of different levels and different situations.
Different types of flow meter with different instrument features and fluid properties, the requirements of the installation conditions and different using conditions, each meter has its scope of application, also has limitations, this requests us in the selection when considering various factors at the same time, when choosing instrument, must be familiar with the object to be tested, instrument, measure the environmental aspects of performance.
3.
The purpose of the measured object 1 meter should be clear.
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