In the new era, petrochemical enterprises are facing unprecedented challenges. How to improve the production efficiency of the petroleum industry and improve the product quality is an important problem that needs to be solved urgently in front of us. The rational application of flow meters to the petrochemical industry can effectively reduce production costs. Promote the improvement of work quality and efficiency of petrochemical enterprises. However, due to the difference of fluids and different production conditions, it is necessary to choose the petroleum flow meters that meet the actual situation based on the actual production needs.
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Extended reading: High Pressure Rotameter for Liquids/gas-Upto 25 Mpa
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Factors affecting the accuracy of petroleum flow meters
(1) Instrument accuracy
During the production of the flow meter, due to rough parts, assembly accuracy and wear, etc., the accuracy of the flow meter itself is not high or the accuracy is reduced, so that the quantity of petroleum products sent (paid) is inaccurate. Therefore, when selecting a flowmeter, one with higher accuracy should be selected. At present, the accuracy of the working flowmeter is required to be ±0.5% in China, and the periodic verification should be carried out according to the regulations in use.
(2) Installation process
Although the accuracy of the flowmeter is high, due to improper or unreasonable installation process, the flowmeter will produce systematic errors. If there is not enough straight pipe section in front of the flowmeter (generally the straight pipe section should not be less than five times the diameter of the oil pipeline used), eddy current will occur, and the elbow in the pipeline will increase the flow resistance for a long time, which cannot guarantee the working pressure of the flowmeter. It can cause errors in the indication value of the flowmeter.
The medium used for the factory calibration indication value of the flowmeter is different from the medium at work, and the indication value reflected by the flowmeter is also different. For example, water is used as the medium during calibration, but it is used in various petroleum product media during work, so there will be errors, mainly due to the different viscosity of the medium. Therefore, it is required that the medium used for calibrating the indication value of the flowmeter should be consistent with the working medium, so as to eliminate the error caused by this.
The flowmeter cannot display the true value of the output (payment) amount due to accidental errors caused by temperature instability during the work start to end. Therefore, it is required that the flowmeter should keep the temperature as consistent as possible during the oil delivery process.
(5) Differential pressure and flow rate
The use of the flowmeter should be within the specified pressure differential range to ensure accuracy. Because the pressure is high and the flow rate is fast, the flow rate is also large, and vice versa. If the flowmeter cannot maintain the consistency of the pressure difference between the front and rear during the oil delivery process, and it is higher or lower than the working pressure difference range of the instrument, it will affect the accuracy of its output (payment) volume.
Extended Reading: Mechanical oil flow meter
(6) The working environment is different from the verification environment
During the periodic verification of the flowmeter, if it is carried out in a specific device of the metrological verification unit, when it cannot be consistent with the verification conditions in use, environmental errors will also occur. Therefore, when periodic verification is required, it is required to be carried out under working conditions, that is, on-site calibration.
Extended reading: Heating Oil Flowmeters
Flowmeter selection principle
The rational design and selection of flow meter should be a scheme with high reliability, convenient maintenance and cost saving under the premise of meeting the requirements of use.
The factors that need to be considered in the selection of flow meters mainly include: fluid characteristics, flowmeter characteristics requirements, installation conditions, environmental conditions and costs.
In addition, the selection of flow meters cannot fully pursue high performance and high precision, which not only increases the procurement cost, but also increases the cost of spare parts.
Accurate measurement and regulation of fluid flow is the basis for ensuring the safety of petrochemical production processes, improving product quality and reducing energy consumption.
Due to the complexity and diversity of the medium for flow measurement, there is no universal flowmeter, and no flowmeter can be applied to various media under any different conditions.
Each flowmeter has its advantages and limitations in measurement, and flowmeters with different principles, structures and functions play a role in their respective applicable ranges.
Therefore, the selection of flowmeters needs to follow standard specifications and selection principles, and comprehensively consider various factors that affect flow measurement.
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Application of flow meter in petrochemical industry
3.1 Application in Onshore Oilfield
Constrained by various factors, the drilling of deep wells and ultra-deep wells in Youshan generally has the problem of wasting high-density weighted materials.
In order to maximize the use of weighted materials, it is necessary to combine the relevant parameters of the centrifuge, the change of density difference, the viscosity of drilling fluid and other data. With the support of the calculation flow meter sensor, accurate data information can be obtained. Working speed and processing capacity. And scientifically control it with the help of computer to achieve the purpose of recycling.
In the use of flow meters in the petroleum industry, the selection of flow meters is very important. Therefore, we must fully consider the characteristics and working principles of flow meters and choose suitable flow meters.
3.2 Application on Offshore Drilling Platforms
At present, the development of offshore oil resources is in the ascendant, and a large number of offshore drilling platforms have been put into operation. They are mainly composed of modules such as public system, process production system and auxiliary process system.
According to the functional requirements of each plate, it is determined that it needs to rely on a large number of flow meters in its role.
The main measurement uses condensate oil as the fluid medium, its parameters are viscosity 0.89cp, temperature range 42～65℃, working pressure 6690～7411KPa, conventional flow 0.521m/h.
Combine the above basic data to filter the flow meter.
First, since the petroleum medium is not conductive, electromagnetic flowmeters can be excluded;
Second, condensate is highly dependent on pipelines, which are then delivered directly to end equipment. This can exclude turbine, ultrasonic and mass flow meters;
Finally, due to the limited space of the offshore drilling platform, the differential pressure flowmeter is also difficult to apply.
In order to prevent high cost, it is also necessary to exclude flow meters and positive displacement. In order to meet the requirements of small pipe diameter and low flow rate, it is also necessary to choose a rotameter.
Extended reading: metal tube flow meter
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Frequently asked questions
Sino-Inst’s petroleum flow meter offer reliable and accurate volume flow measurement in a large range of sizes and pressure rating while being fully compliant with international standards.
Sino-Inst is the risk-free choice for your petroleum flow measurement applications.
Sino-Inst’spetroleum flow meters, made in China, Having good Quality, With better price. Our flow measurement instruments are widely used in China, India, Pakistan, US, and other countries.
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Wu Peng, born in 1980, is a highly respected and accomplished male engineer with extensive experience in the field of automation. With over 20 years of industry experience, Wu has made significant contributions to both academia and engineering projects.
Throughout his career, Wu Peng has participated in numerous national and international engineering projects. Some of his most notable projects include the development of an intelligent control system for oil refineries, the design of a cutting-edge distributed control system for petrochemical plants, and the optimization of control algorithms for natural gas pipelines.