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Has my problem been solved? Why close the post?

2009-02-07View Original

Thread Content

My question is: 1. Do pneumatic control valves still consume instrument air at all times when they are not in operation? 2. If one wants to reflect more accurately the actual gas consumption of pneumatic instruments (valves), how should it be calculated? (Don’t estimate 1.3 NM3/h per unit.) The poster’s reply: The air consumption of control valves includes the air used by valve positioners and that required for the operation of the diaphragm elements; 1.3 Nm3/h is assumed for each of these aspects. Additionally, 0.3 Nm3/h is required to open and close the valve. If analytical instruments require instrument air as well, that amount must also be taken into account. The total amount obtained after adding all these values needs to be multiplied by several factors: 1. The air leakage factor (1.1 can be used in China, while 1 is used abroad, assuming no leakage); 2. A margin for future addition of instruments (1.5 can be used in China, while 1.2 or 1.3 is used abroad). This is because plant designs in China are often modified, whereas plants abroad are rarely altered. The poster also asked me to check previous posts; I have read those posts, but none of them provided an answer to the question of how to calculate the actual air consumption of pneumatic instruments (valves) in a more accurate manner. I also made it clear that “one should not estimate 1.3 NM3/h per unit.” And look at the moderator’s reply... It doesn’t matter what the reply is, but my question still hasn’t been resolved – why was it closed? ! ! May I ask, has my problem been resolved? ? ? Why did the moderator close my post? My first question only requires a yes or no answer. For the second question, if everyone doesn’t know how to calculate it, one can say that there is no good way to do it at the moment, and so on. :Q
Reply #22009-02-07
The information in the design manual is truly for reference only. Our 37 units consume 6 NM3/H. Different pressure regulators and piping systems have a significant impact on the consumption of instrument air.
Reply #32009-02-07
For issues that one feels have not been resolved, if the moderator closes the thread, one can send a short message to the moderator. Banzhu still has a lot of work to do, so please be understanding!
Reply #42009-02-07
Hehe, thanks for your understanding and support, FreeDust. Don’t forget to check out our control system technology exchange forum from time to time – the users there also need you:victory:
Reply #52009-02-08
Your post has been unlocked and promoted! If you have any further questions, feel free to message me!
Reply #62009-02-10
It does show that you trust the section very much. Everyone will support it 1

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