Flowmeter flow selection
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First, I have a question and would appreciate it if the experts here could give me some guidance. Thank you in advance. The question is as follows: The normal flow rate of the rotameter is 0, while the maximum flow rate is 2600 kg/h. The medium involved is a process fluid. How should the range of the rotameter be selected?
The normal flow rate is much higher than the maximum flow rate, so choosing the right flow meter is indeed a problem – one that is too small isn’t sufficient, while one that is too large results in poor accuracy... However, what the original poster said about the normal flow rate being 0 is excessive as well. (Correction: It’s much \"lower\" than the maximum flow rate.) This post was last edited by Da Yu Ruo Zhi on 2007-12-22 at 22:55.]
It seems to me that what the original poster is describing is a bit like an emergency vent. . . Hehe
Hehe, I agree with the third floor’s opinion; this question is quite interesting
Published on 2007-12-18 19:00. View only this author’s posts. The normal flow rate is much higher than the maximum flow rate; choosing the right flow meter is indeed a problem – one that is too small isn’t sufficient, while one that is too large results in poor accuracy... But what the original poster said about a normal flow rate of 0 is excessive; there was a misunderstanding with the comment above! This post was last edited by nobelguo on 2008-1-22 08:50]
Hehe, it’s not for venting pipes; it’s used to flush the flow meters on the pipes. It’s not used under normal circumstances, and its accuracy requirements aren’t very high either! I have now found the selection criteria for a rotameter: the normal flow rate should be around 50% of the flow range, while the maximum value should be around 80%~90% of the flow range; both the maximum and minimum values must fall within this range, with the normal flow rate being the priority! Based on the above principles, the flow rate range that can be chosen for this topic is calculated at 90%, so 300–3000 kg/h can be selected (with a normal flow rate of 0 and a maximum flow rate of 2600 kg/h). I would appreciate some guidance from those with more experience; thank you!
Given that, I don’t see any need to discuss it further! If it has to be used, install one. Or rather, don’t bother pretending at all. :lol
The normal flow value is around 50% of the flow range.
It’s just one wrong character; is what was said incorrect then? For example, the normal flow rate is 1–2 M3/Hr, but operations often take place at rates of several thousand M3/hr; in such cases, it becomes difficult to choose a suitable flow meter. Is this related to a lack of understanding of the manufacturing process? If it weren’t difficult, would you come and ask? Since you mentioned on the 6th floor that the precision requirement isn’t high, follow what was said on the 7th floor.
Since the requirements are not high, flow meters with lower precision can be considered; they are also cheaper
The rated flow rate is set at 3000 kg/h; the range ratio of the rotor is 10:1, so the instrument range for the rotor is 300–3000 kg/h.
The poster must be doing it on purpose, haha. By normal, it refers only to normal operating conditions, not that the normal flow rate of the flow meter is 0. In other words, the fact that this flow meter is not in use does not mean that its normal flow rate is 0; it’s a matter of concept! Personally, I think a range of 300–3000 kg/h is acceptable.
Generally, the range of rotary flow meters is calibrated based on water or air, and a density conversion is required
The original poster’s answer is extremely insightful; it hits the nail on the head! ! Classic; I hope the moderator will give extra points! ! :handshake
The normal flow value is around 40% of the flow range.
The range ratio of the rotameter is 10:1; depending on your maximum flow rate, you can choose a range of 300–3000 kg/h
Since it is used to relieve discomfort, it should work fine. If there are requirements regarding flow restrictions during flushing, a orifice plate can be installed to control the flow rate
If the range cannot meet this value, install two – one with a large range and one with a small range.