Small gas rotor flowmeter | Characteristics and applications of various flowmeters

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What flowmeter is used to measure light hydrocarbon gas?

1. Gas waist wheel flowmeter Gas waist wheel flowmeter, also known as Roots flowmeter, can be used not only to measure dry gas, but also to measure wet gas (i.e. associated gas). Due to the unsuitability of orifice flow meters and turbine flow meters for measuring associated gas containing liquid droplets, gas waist wheel flow meters have certain advantages as they do not have strict requirements. In addition, another advantage is that it is insensitive to the flow of arteries. However, when measuring natural gas, the following points should be noted:

1. Generally, a filter with a certain mesh size should be installed upstream of the flow meter to prevent the flow meter from getting stuck or blocked, and regular drainage and inspection and cleaning of the filter screen should be carried out.

2、 In order to prevent the accumulation of liquid in the measuring chamber of the flow meter, the flow meter should be installed vertically or higher than the process pipeline as much as possible, and the accumulated liquid should be discharged regularly.

3、 Before using the flowmeter, it is necessary to ensure that there are no welding slag or other impurities in the pipeline, and to open a bypass to prevent the flowmeter rotor from running at high speed and damaging the flowmeter.

4、 It is necessary to regularly observe and pay attention to the pressure before and after the flowmeter, and promptly diagnose faults. In addition, the gas waist wheel flowmeter also has a major drawback, which is that the noise is relatively high when the waist wheel rotates at high speed.

2. Gas turbine flowmeter Gas turbine flowmeter is a comm

only used natural gas flow measurement instrument, with the advantages of simple structure and easy installation; The external dimensions are relatively small; High accuracy; Good repeatability; The wide range can reach 15:1 to 25:1, and under high-pressure gas transmission, the range can be further increased; Its output is a pulse frequency signal, so when used with a programmable flow display meter, it is easy to achieve lower system uncertainty. Its disadvantage is that the turbine rotates at high speed, and there is mechanical friction between the bearing and the shaft, resulting in a short service life. Therefore, lubrication should be paid attention to, and the lubrication methods provided by the manufacturer can be used to regularly replenish lubricating oil. In addition, if the gas flowing at high speed contains large solid particles, it is easy to damage the turbine blades. Therefore, a filter should be installed on the pipeline in front of the turbine flowmeter.

III. Spiral flowmeter Spiral flowmeter is currently the preferred flowmeter product for some small natural gas distribution stations in China, with a wide working temperature range;

; Large range; The Reynolds number is within a certain range and is not affected by fluid temperature, pressure, density, and viscosity; Strong applicability, generally does not require a filter unless it contains larger particles or longer fiber impurities; The requirements for the upstream and downstream straight pipe sections are relatively low, and the upstream 4D and downstream 2D straight pipe sections are sufficient; The output frequency is linearly related to the volumetric flow rate. Its disadvantage is that the pressure loss is relatively large. Secondly,

Small gas rotor flowmeter | Characteristics and applications of various flowmeters

What flowmeter is used to measure light hydrocarbon gas?

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