Waist wheel flowmeter is not fully loaded

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1. What are the common types of pipeline flow measurement instruments? According to the measurement principle, pipeline flow measurement instruments are mainly divided into six categories: differential pressure, volumetric, velocity, electromagnetic, ultrasonic, and mass. Each type is suitable for different media, working conditions, and accuracy requirements.

1. Differential pressure flowmeter is based on Bernoulli equation and calculates flow rate by measuring the pressure difference before and after the throttling element. It is one of the most widely used flow measurement schemes in industry.

. 1. Standard orifice plate flowmeter: simple structure, low cost, suitable for clean gas, liquid and steam working conditions, it needs to meet the installation requirements of the front 10D and back 5D straight pipe sections (D is the inner diameter of the pipeline), otherwise the measurement accuracy will be greatly reduced.

Secondly, volumetric flow meters calculate the total flow rate by directly measuring the fixed volume of fluid discharge, with high measurement accuracy and suitable for measuring high viscosity media.

. 1. Elliptical gear flowmeter: suitable for high viscosity clean liquids such as lubricating oil and finished oil, with an accuracy of 0.2 level or above. The medium should not contain particle impurities, otherwise it will damage the gears. 2. Waist wheel flowmeter: can adapt to larger flow conditions, commonly used for trade measurement of crude oil and finished oil, with slightly stronger anti impurity ability than elliptical gear flowmeter. 3. Scraper flowmeter: can withstand a small amount of suspended particle media, suitable for measuring oil products and mud fluids containing impurities, with a longer service life.

III. Velocity flow meters convert the flow rate of fluid passing through sensors into flow rate, and are divided into three main types: turbine, vortex street, and rotor.

. 1. Turbine flowmeter: Relying on the rotational speed of the impeller with the fluid to correspond to the flow velocity, it has high accuracy and is only suitable for measuring clean liquids and gases, such as tap water and natural gas. It is necessary to regularly clean the impurities attached to the impeller. 4. Based on Faradays law of electromagnetic induction, electromagnetic flow meters can only measure the flow rate of conductive media and are not affected by fluid density, viscosity, or temperature. 1. Integrated electromagnetic flowmeter: The sensor and converter are integrated, easy to install, and suitable for conductive media such as sewage, acidic and alkaline solutions, and mud. During installation, it is necessary to ensure that the electrode is flush with the inner wall of the pipeline to avoid disorderly operation of the pipeline. 2. Clamp on electromagnetic flowmeter: does not require pipe breaking installation, suitable for old pipeline renovation scenarios, only suitable for clean conductive media.

Fifth, ultrasonic flow meters measure flow velocity through changes in the propagation characteristics of ultrasonic waves in fluids, which are divided into two categories: time difference and Doppler.

. 1. Time difference ultrasonic flowmeter: suitable for clean gases and liquids, with high accuracy, can achieve non-contact clamping measurement without breaking the pipe, and has low requirements for straight pipe sections

2. Doppler ultrasonic flowmeter: relying on the

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