Natural gas electromagnetic flowmeter precise measurement characteristics and instrumentation requirements: as a primary energy, gas in the global primary energy structure of the proportion is gradually increasing.Capitalist countries have generally exceeded 30-40%, so the amount involved in the transition of gas trade measurement and verification is very large, causing the international attention.In order to ensure the fair and effective trade measurement verification of gas production and use companies, and to maintain the legal rights of each other in trade, European government ** formulated en1777:1998 "basic provisions for accurate gas measurement system".Here in China, a relative standard GBlT186032001 "technical standard for gas metering verification system" has been basically formulated.
Natural gas electromagnetic flowmeter
The gas metering verification system has the following key characteristics and basic requirements.
(1) explosion-proof inflammable and explosive articles of fluid mechanics shall be classified according to GB3836.1 in the risk area. In the risk area, the motor selection and installation of all instruments and electrical equipment shall meet the requirements of GB3836.
In order to ensure the continuous collection station, it is not allowed to set the bypass valve due to the final air circuit such as the instrument maintenance for metrological verification. For the key customers with large total flow, it is strongly recommended to choose the series double metrological verification circuit.The inlet valve and the upstream and downstream valves (or the middle and downstream valves) of the tandem double metrological verification loop should be selected to have good closing characteristics, durable and leakage measuring equipment to prevent the outflow of non-metrological verification.
(3) the pluralistic gas load must be measured and verified in the important links from collection, solution, transportation to distribution. During the collection stage, hydromechanical stains, vapor belt liquid and even solid phase are required.The working pressure of different gas Wells varies greatly.The working pressure of fluid mechanics is also high during the delivery phase, but will be very low when assigned to the ** end customer.Therefore, different stages of flow measurement should be clear fluid mechanical load and specific conditions, can not be generalized.
(4) different accuracy stipulates that gas metering verification belongs to bulk commodity energy metering, and the larger the total flow value is, the larger the clearing amount involved will be.The price of the total flow meter is related to the accuracy, and the higher the accuracy is, the higher the price is. The metrological verification system with less relativity of the value of metrological verification generally cannot afford the high accuracy meter with much more expensive price. Therefore, it only has to reduce the standard, but it should still exceed the provisions of the relevant specifications.Table 2.1 lists different levels of instruments and instruments of electromagnetic flowmeter measurement verification system.Table 2.2 is the instrument accuracy regulation of supporting facilities of measurement verification system at different levels
(1) when the natural gas for each other with the total flow of kinetic energy work handover must supporting facilities of the new project.
(5) different types and quantities of heart output in the metrological verification system the main parameters of the unit metrological verification system are different from those of the turbine flowmeter
Accurate measurement of the intelligent transmitter, flow calculation and clear the output of the conversion equipment.According to the composition and necessity of the system, the accuracy of the output barometer related to the measurement of vapor mass and vapor quality shall not be less than 1.0%.
When the metrological verification by the controller (intelligent transmitter), secondary instrument constitute the precise measurement of the equipment or systems, from table 2.3 accuracy should be the accuracy of the equipment or system (equipment or is not assured, it is concluded that the system accuracy, the can controller and the accuracy of secondary instrument according to the deviation of generation to generate electric energy as raw materials manufacturing applications, the accuracy of the metrological verification should consider the production process of relative regulations.
The characteristics of pressure transmitter must consider the relative production process characteristics and the application of natural environment provisions, such as corrosion resistance, heat resistance, vibration resistance, anti-dust, anti-interference signal preparation.
At present, Shanghai porcelain city flowmeter has been exported to more than 100 countries, set foot in more than 100 industries.At the same time, the developed micro flowmeter has also obtained the metering certification.Fill in the blank of tiny flowmeter at home, broke the forestall of foreign enterprise at the same time.