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Hi all, First of all, sorry for my english. It is my first time posting in eng-tips and I am not sure how to explain my problem/doubt. We are performing the hydraulic calculation of a vertical thermosiphon of a deethanizer column in order to establish the relative elevation of the thermosiphon...

We haven't think about a self-contained regulator but it seems to be a very good solution. Thank you very much!

Once again, thank you all for your help. JL, the orifice plate with 2 transmiters seems to be a good solution. The only doubt I have is if with a 1 in water column range transmiter I would be able to read the pressure drop generated by the minimim flow (64 Nm3/h) in the orifice sized for the...

ScottyUK, One last question about the split range system. If the orifice plate is sized for the maximum flow, when the minimum flow is circulating the pressure drop originated in the orifice will be almost negligible. Will be the low range transmiter capable of reading this small pressure drop...

Ashereng, This is the first time I use Eng-tips forum. What do you mean with "Have you read FAQ731-376 to make the best use of Eng-Tips Forums?"? I have just read it and I do not know what I have done wrongly. Could you explain it more to me in order to not repeat my faults? I find this forum...

JLSegull thank you for your reply. Let my expose you another option in order to get your opinion. A control valve in the backup line with the pressure controller set at 5 Kg/cm2 g (normal instrument air header pressure is 7 Kg/cm2 g). When the pressure falls into 5 Kg/cm2 g the pressure...

First of all, thank you very much for your answers. JLSegull coriolis meter would be a really good option but the the price is completely unacceptable in the current shedule of project. ScottyUK I do not understand your solution. An orifice could not be use because of beta problems. The...

I need to measure the nitrogen production after the generation package. The minimum flow is 64 Nm3/h, the normal flow is 85 Nm3/h and the maximum flow is 1350 Nm3/h. The N2 generation pressure is 10 Kg/cm2 g and the temperature is 38ºC. The line size is 6”. An oriffice plate is not suitable...

Hi all, My question is about the more appropiate method to control the instrument air backup. The instrument air is normally generated in the IA package and flows towards the IA header of the unit. In case there is a problem in the generation package, there is a backup from the IA refinery...