Structural Diagram of Orifice Flow Meter | Illustration of Electromechanical 2022- Pressure Measurement Method of Orifice Flow Meter

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What flow meters are commonly used on steam pipelines?

The commonly used flow meters on steam pipelines mainly include the following types, which need to be selected based on actual working conditions, measurement accuracy, range, pressure loss, and installation and maintenance costs.

1. Working principle of vortex flowmeter: Based on the Karman vortex street principle, the steam flow rate is calculated by measuring the alternating vortex frequency generated by the impact of steam fluid on the triangular cylinder vortex generator.

. The vortex frequency is directly proportional to the average flow velocity of the fluid, and the volumetric flow rate can be calculated by combining the cross-sectional area of the pipeline. Applicable conditions: Preferred for steam pipeline temperature ≤ 300 ℃, with low cost and wide applicability. Large measurement range, low pressure loss, high accuracy (usually ± 1%~± 2%), and high reliability. No movable mechanical parts, low maintenance, and long-term stable instrument parameters. Structural composition: sensors, converters, display instruments. Sensors (such as piezoelectric stress sensors) convert vortex mechanical effects into electrical signals and output flow values after processing. Signal output: Supports analog signals (4-20mA) or digital signals (pulse signals) for easy data transmission and reading. Image: The vortex flowmeter is disassembled to measure the vortex frequency and calculate the flow rate Working principle of differential pressure flowmeter: Based on Bernoulli equation and flow continuity equation, the flow rate is determined by measuring the differential pressure generated by throttling devices (such as orifice plate, nozzle, V-cone). Common Structural diagram of orifice flowmeter

type: Orifice flowmeter: simple structure, but significant pressure loss. V-cone flowmeter: utilizing the V-cone throttling effect, with low pressure loss and high measurement accuracy, suitable for high viscosity or dirty media. Features: Suitable for high-temperature and high-pressure steam pipelines, but requires regular maintenance of throttling devices. The measurement accuracy is affected by fluid density and temperature, and needs to be combined with temperature and pressure compensation. Figure: Differential pressure flowmeter generates differential pressure measurement flow rate through throttling device Working principle of splitter rotor steam flowmeter: After entering the throttle body, the steam is divided into two paths: one part passes through the main pipe throttle hole like a plate; The other part impacts the impeller through the diversion pipe nozzle, and the impeller speed is proportional to the flow rate. Features: Simple structure, low cost, but accuracy is affected by impeller wear. Suitable for small and medium-sized steam pipelines with a narrow range

4. Electromagnetic flowmeter (special case) Applicable conditions: Only used when steam condenses into liquid water or contains a large amount of water, as electromagnetic flowmeters require conductive media (such as water) to work. Features: No pressure loss, high measurement accuracy (± 0.5%~± 1%). It is necessary to ensure the conductivity of the medium, otherwise it cannot function properly. It is recommended to prioritize the selection of vortex flowmeter: if the steam temperature is ≤ 300 ℃ and there are no special requirements, its comprehensive performance (accuracy, cost, maintenance) is optimal. High temperature and high pressure con

Structural Diagram of Orifice Flow Meter | Illustration of Electromechanical 2022- Pressure Measurement Method of Orifice Flow Meter

What flow meters are commonly used on steam pipelines?

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