In order to choose an economical flow meter, you'd better pay attention to below points.

1. The cost of purchasing flowmeter shall be considered economically

When purchasing flow meters, the economic impact of different types of flow meters on the whole measurement system shall be compared. For example, a flowmeter with a small range needs multiple flowmeters in parallel and multiple pipelines to cover the same measurement range than a flowmeter with a wide range. Therefore, in addition to the flowmeter, many auxiliary equipment, such as valves and pipeline accessories, need to be added. Although on the surface, the cost of flowmeter is less, but other costs are increased, which is not cost-effective. For example, the cost of installing orifice flowmeter and differential pressure gauge is relatively cheap, but the cost of forming measurement circuit, including fixed accessories of orifice, may be much higher than that of basic parts.

2. Installation cost

When purchasing flow meter, not only the purchase cost of flowmeter, but also other costs, such as accessory purchase cost, installation and commissioning cost, maintenance and regular detection cost, operation cost and spare parts cost, shall be considered.

For example, many flow meters should be equipped with relatively long upstream straight pipe section to ensure their measurement performance. Therefore, the correct installation requires the arrangement of additional pipes or the provision of bypass pipes for regular maintenance. Therefore, the installation cost should be considered reasonably in many aspects, for example, it should also include the auxiliary costs such as stop valve and filter required for operation.

3. Operating costs

The operation cost of the flowmeter mainly refers to the energy consumption during operation, including the internal power consumption of the electric instrument or the energy consumption of the air source of the pneumatic instrument, as well as the energy consumed by pushing the fluid through the instrument in the measurement process, that is, the pumping energy consumption to overcome the pressure loss of the instrument due to measurement, etc. Only full channel and unimpeded electromagnetic flowmeter and ultrasonic flowmeter basically have zero cost. Since the plug-in flowmeter is used for large pipe diameter and the blockage ratio is small, its pressure loss can also be ignored.

4. Testing cost

The detection cost shall be determined according to the verification cycle of the flowmeter. For the detection of crude oil or product oil generally used for trade settlement, a standard volume tube is often set on site to conduct on-line verification of the flowmeter.

5. Maintenance cost and spare parts cost, etc

The maintenance cost is the cost required to maintain the normal operation of the measuring system after the flowmeter is put into use, mainly including maintenance and spare parts. The flowmeter with moving parts needs more maintenance work, such as the most common orifice flowmeter checked by geometric measurement method.

The cost of spare parts will increase with the improvement of the performance of the flowmeter. When selecting the flow meter, the purchase cost of spare parts shall be increased at the same time, especially for the flowmeter imported from abroad, sometimes the whole flowmeter will be replaced due to the difficulty of vulnerable spare parts.

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