I would like to ask how to calculate the air volume required for measuring backflow pressure and liquid level
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I would like to ask the experts in design: how is the air volume for backflow calculated? We are using a rotameter to regulate the air volume – how is the measurement range of this meter determined?
Assume wind blowing the liquid: 1. The inner diameter d of the backflow pipe outlet is not necessarily equal to the pipe outlet of the equipment. 2. Maintain the flow rate at the outlet of the backflow tube at 0.2~0.3 M/s. Based on 1/2, the backflow rate at the operating pressure is obtained. Following this principle, the flow meter to be selected is roughly 60 L/h (at operating pressure). If the liquid is viscous, it can be increased to 100 L/hour.
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Previously, a float flow meter designed for measuring nitrogen was used, with the setting adjusted to 30-45 L/H. Now, a float flow meter designed for measuring hydrogen is used to blow nitrogen, with the setting set at 60. Through testing, even when the setting was increased to 120 or 200 (which corresponds to approximately 30-50 in terms of nitrogen volume), the measurement values remained essentially unchanged.