Gas flow velocity in vacuum pipeline
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Recently, I was calculating the pipe diameter for a new device. This system features many vacuum pipes, and some of them require a relatively high level of vacuum – for example, an absolute pressure of below 10 KPA is required. In this way, when performing calculations, I keep the pressure drop per 100 meters in the pipes at around 1–2 KPA/100m. As a result, the gas flow velocity calculated becomes very high, with many cases reaching 70–80 m/s. Therefore, I increased the diameter of the pipes, and the pressure drop ceased to be a limiting factor, becoming quite small. The diameter of the pipes selected often ranges from 500 to 800. It is a plant with limited production capacity, yet the pipes have such large diameters. . . It always feels awkward. . . Can high flow rates of vacuum gas cause significant damage to pipes? Will a higher-grade pipe material be used due to high flow rates? Should I focus on pressure drop, or on controlling flow rate? I’ve been working for less than three months yet; thank you all in advance for your guidance
Pressure drop is the primary factor, with flow velocity also taken into consideration. Of course, the allowable flow rate under vacuum is much higher than at atmospheric pressure. But be careful to consider whether the formula you are using is suitable for calculating pressure drops at such high pressures
A higher flow rate can be used; sometimes it can be set at 120-200 m/s； The high flow rate in vacuum pipes does not cause significant damage to the pipes due to erosion, mainly because although the speed is high, the amount of gas is low; overall, the impact is minimal ； However, in a high vacuum environment, at the bends in the pipelines, using a larger bending radius can help reduce damage to those areas. Vacuum pipelines are mainly used to control the pressure drop, in order to meet the requirements for vacuum level, generally speaking.
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Considering the pressure drop as the main factor, the gas density is low under negative pressure, so it has little impact on the pipes; only when the flow velocity increases does it affect the vacuum.
Considering the pressure drop as the main factor, the gas density is low under negative pressure, so it has little impact on the pipes; only when the flow velocity increases does it affect the vacuum.
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