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1. What is the required diameter flow meter for delivering 400 standard cubic meters of nitrogen per hour? It is recommended to use a DN80 pipeline with a vortex flow meter to transport 400 standard cubic meters of nitrogen per hour. 1. According to the economic flow rate of industrial gases (10-30 m/s), the recommended pipe diameter for a flow rate of 400 Nm ³/h is as follows: * Flow rate of 10 m/s: pipe diameter ≈ 119 mm, corresponding to DN125 pipeline * Flow rate of 20 m/s: pipe diameter ≈ 84 mm, corresponding to DN80 pipeline (preferred recommendation) * Flow rate of 30 m/s: pipe diameter ≈ 69 mm, corresponding to DN65 pipeline. DN80 pipeline achieves a good balance between flow rate (about 20m/s) and pressure loss, and is a commonly used choice for this flow rate.
2. Flow meter selection for DN80 The main types and characteristics of flow meters applicable to pipelines are as follows: | Flow meter types | Characteristics | Applicability | |: --- |: --- | | Vortex flow meters | Simple structure, easy installation and maintenance, high accuracy, low pressure loss | Preferred recommendation, very suitable | Gas turbine flow meters | High accuracy, good repeatability, but high requirements for high dielectric quality and cleanliness, expensive | Suitable but high cost | Orifice flow meters | High reliability, wide application, but high pressure loss, relatively low accuracy | Available but not the most preferred | 3 Before finalizing the key selection parameters, the following operating parameters must be confirmed: * Working pressure: affects gas density and actual volume flow rate. *Working temperature: affects gas density and flowmeter material selection. *Nitrogen purity and cleanliness: determine whether
2. Flow range of vortex flowmeter
The flow range of vortex flowmeter is mainly determined by the sensor diameter and fluid properties. The larger the diameter, the wider the measurable flow range.
. The conventional liquid measurement range is between 0.5m/s and 7m/s flow rate, and the gas measurement range is between 5m/s and 60m/s. 1. Correspondence between caliber and flow rate (under normal temperature water conditions) The flow range is directly related to the instrument caliber, and the following are typical parameters (referring to the product manuals of mainstream domestic manufacturers such as Chuanyi and Ganges in 2023): • DN15: minimum about 1.2 m ³/h, maximum about 15 m ³/h • DN25: minimum about 3 m ³/h, maximum about 40 m ³/h • DN50: minimum about 10 m ³/h, maximum about 150 m ³/h • DN100: minimum about 40 m ³/h, maximum about 650 m ³/h • DN200: minimum about 150 m ³/h, maximum about 2500 m ³/h • DN300: minimum about 300 m ³/h, maximum about 5500 m ³/h. 2. Influence of fluid medium • Liquid measurement (Water, oil, etc.): The flow rate range is usually 0.5-7 m/s, and liquids with viscosity higher than 30cP will significantly increase the measurement lower limit. Gas measurement (air search, steam, etc.): The flow rate range is usually 5-60 m/s, and low-pressure gases may have an increased lower limit flow rate due to low density. • Steam measurement: It is necessary to distinguish between saturated steam and superheated steam, and the flow range should be calculated based on temperature and pressure compensation to determine
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