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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. What are the specific dimensions corresponding to each specification of the vortex flowmeter?
There are various specifications for vortex flowmeters, and the size of the same specification air flow meter produced by different manufacturers may also vary.. Generally speaking, a DN15 caliber vortex flowmeter has a length of about 150mm and an outer diameter of about 108mm; a DN20 caliber flowmeter has a length of about 150mm and an outer diameter of about 133mm; DN25 caliber has a length of around 160mm and an outer diameter of 159mm; DN32 caliber has a length of about 180mm and an outer diameter of 194mm; DN40 caliber has a length of about 200mm and an outer diameter of 219mm; DN50 caliber has a length of 230mm and an outer diameter of 273mm; DN80 caliber has a length of 310mm and an outer diameter of 325mm; DN100 caliber has a length of 350mm and an outer diameter of 377mm; DN150 caliber has a length of 450mm and an outer diameter of 480mm; DN200 caliber has a length of 550mm and an outer diameter of 530mm. These are only approximate size ranges. In practical applications, the accurate size should be determined based on the product manual provided by the specific manufacturer, Zhiqianqiao, as factors such as product design and manufacturing processes can cause differences in size.
3. National Standard Specification for Vortex Flow Meter
The national standard specification for vortex flow meter mainly includes the following items
1. GB/T 25922-2023 standard name: "Measurement of fluid flow in closed pipelines usi
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