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Edited by ally01389, 14 October 2019 - 08:56 AM.
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Posted 14 October 2019 - 08:54 AM
Edited by ally01389, 14 October 2019 - 08:56 AM.
Posted 14 November 2019 - 01:06 AM
Hi ally01389,
I need to read this topic several times to really understand what you are trying to gain here.
From all of your questions above you have already answer it by yourself based on the theory that you know.
What I can say is that is all theory predicted is possible, in the industry there has been some incident of storage tank collapse due to vacuum pressure inside the tank due to lack of in-breathing and out-breathing flow to exchange the fluid that is being taken from the storage tank.
Even this is quite weird storage, but the same basic applied, for the water intake/out-take isolation valve my suggestion is to ensure this valve is always open in order to ensure the in-breathing/out-breathing of the exchange fluid in the cavity is certain. And also to ensure that the pipe end shall always dip in water if no air shall be ingress. And also the Pipe and In-Breathing and Out-breating flow that you have considered is enough. May be to see from API STD 2000.
For the NPSHa, make sure that you calculate the most minimum NPSHa that you may encounter, this shall also include the smallest NPSHa means when the oil bladder shrink. How to calculate this, enclosed is the initial and final condition after the pump remove the content in the bladder.
Initial and Final Condition.xlsx 88.4KB 8 downloads
It should be enough for you to correlate it with connected tube equation to get the pressure.
Edited by Erwin APRIANDI, 14 November 2019 - 02:32 AM.
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