Talking about oil metering skid-mounted system and its calibration

Abstract: Talking about the oil metering skid-mounted system and its calibration information are provided by the excellent flowmeter and flowmeter manufacturers and quotation manufacturers. 0 Introduction The metering skid-mounted system has been widely used in the custody transfer metering of crude oil, refined oil and natural gas as a metering system that can ensure high metering accuracy. At present, 80% of the crude oil trade transfers in the world's new projects are metering skid-mounted systems. You are welcome to inquire for more flowmeter manufacturers to select models and price quotations. The following is the details of the article on the oil metering skid-mounted system and its calibration. 0 Introduction The metering skid-mounted system has been widely used in the custody transfer metering of crude oil, refined oil and natural gas as a metering system that can ensure high metering accuracy. At present, 80% of crude oil custody transfer in new projects in the world is in the form of metering skid-mounted systems. In recent years, my country has also adopted metering skid-mounted systems in many large-scale projects in the oil and natural gas industry, such as: Lancheng-Chongqing refined oil pipeline, Pearl River Delta refined oil pipeline, Kazakhstan crude oil project invested abroad by my country, Kenya refined oil project projects etc. The metering skid-mounted system is widely used in the oil and gas industry for its high precision and high stability. 1. Composition of the metering skid-mounted system The metering skid-mounted system is what we usually call the metering system. It integrates all parts involved in metering, installs it on a steel base in advance, and performs pressure testing and various functional tests before leaving the factory. , and obtain the metrological verification certificate. After arriving at the site, you only need to connect the upstream and downstream pipelines and connect the signal to the instrument cabinet in the control room before it can be put into operation. The metering skid is an integrated“project”, as a whole product“Bale”Supply, can reduce a lot of trouble for users. The main process flow chart of oil metering skid installation is shown in Figure 1, which mainly includes the following parts: 1) Metering instruments: mass flowmeter, ultrasonic flowmeter, turbine flowmeter, scraper flowmeter, etc. 2) Detection instrument: temperature, pressure transmitter and temperature gauge, pressure gauge. 3) Analysis instrument: automatic sampler, moisture analyzer, density meter. 4) Online comparison loop and online calibration interface. 5) Pipelines and valves: including downstream shut-off valves, flow control valves, drain valves, and relief valves. 6) Instrument circuit system, such as: power distribution box, signal junction box, flexible connecting pipe, explosion-proof threading pipe, threading box, etc. 7) Control cabinet, flow computer, PLC (control valve and circuit switching, optional). 8) Various steel frame support structures, escalators, aisles, etc. 9) Steel base. 1.1 Measuring Instruments Measuring instruments are the core part of the metering skid-mounted system. According to the specification requirements, the custody transfer measurement accuracy of crude oil exported from oil fields is 0.2. The main types of instruments currently used include: scraper flowmeters, mass flowmeters, ultrasonic flowmeters meter, turbine flowmeter, etc. The measuring instrument outputs two pulse measurement signals at the same time, one is transmitted to the respective metering flow computer, and the other is transmitted to the calibration flow computer. As a traditional detection instrument, the scraper flowmeter has the advantages of high measurement accuracy, strong adaptability, and is not affected by the density of the medium, and has been widely used. However, when crude oil is measured by a scraper flowmeter, under the operating process conditions, changes in temperature, pressure, viscosity and other factors will affect the volume of crude oil, which will lead to additional errors generated by the flowmeter itself. The long-term wear and tear of the flowmeter measurement chamber will cause errors, etc., so the scraper flowmeter also has certain defects. Mass flowmeter, which directly measures the quality of the fluid, can measure a wide range of liquids (including high-viscosity liquids, liquids containing oily solid particles, liquids containing a small amount of gas evenly distributed, etc.), the amplitude of the measuring tube is small, and can be regarded as no The movable parts, without the requirement of upstream and downstream straight pipe sections, can measure the density and temperature of the liquid level at the same time, and have gradually been widely used. However, the mass flowmeter also has certain limitations: the pressure loss is large, and the maximum diameter of the current mass flowmeter is only DN150, which is sensitive to external vibration and expensive. Ultrasonic flowmeter and multi-channel ultrasonic flowmeter have outstanding advantages in large-diameter pipeline and large-flow measurement. Its structure without moving parts and perfect self-diagnosis function greatly improve the reliability of the flowmeter without additional pressure loss. It has obvious advantages in energy saving, and the measuring range is far larger than other flow meters. Since the ultrasonic flowmeter calculates the flow by indirectly measuring the ultrasonic transmission time by the intelligent electronic unit, the manual“manufacture”The flow-related pulse (frequency) is obtained, the flow pulse and serial signal are obtained by calculation, so the output signal will lag behind the fluid characteristics, and after data conversion processing, the pulse signal is likely to lag behind the serial data signal; due to The fluid flow is unstable, and slight flow disturbances or pulsations will be measured by the flowmeter, resulting in uneven pulses and other disadvantages of the flowmeter. 1.2 The flow computer provided by the flow computer metering skid-mounted system has obtained relevant certifications from international authoritative certification bodies (such as API, OIML, etc.), and has obtained the type approval certificate of measuring instruments of the People's Republic of China. It will form a flow measurement system with related flow meters and related instruments for trade measurement, flow detection and flow calibration.

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