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Thanks al lot to all of u! I wasn't here, therefore couldn't reply. Thanks again! you are very helpful!

LittleInch, but zeusfaber mentioned that pressure after pressure regulator will be constant( 207 barg) and doesn't matter you fill bottle or not. it will be constant unless upstream pressure of pressure regulator is more than 207 barg

IRstuff, no it is not for school, it is just real problem I see

LittleInch, I found that restrictor is orifice and area of it is 1/4 inch. max flow rate through regulator is 3887 l/min

LittleInch, but in my post, I said " imagine vessel supply pressure is constant" in this case, aren't they same thing?

zeusfaber, If accumulator new pressure is 290 barg, then I can fill 12 bottles with the amount of air in air accumulator. Of course, after filling 12 bottles accumulator pressure will be 212 barg approximately. so in terms of amount of air it is not problem. My problem was about charging time...

LittleInch, I am sorry what do you mean by restriction device? ( I am just student) By looking at P&IDs , there are valves. I looked at datasheet of valves to air bottles. orifice size is 0.156 inches and Cv value is 0.35. Max flow through regulator according to datasheet is 3887 l/min when...

" given this is the same thing, you don't have a vessel at 207, you have a constant pressure supply which is something quite different." I am very sorry , but why quite different? in terms of calculation cant we consider as the same process?

LittleInch thanks for response. you mentioned" The pressure time graph line will be more or less straight up to that point and then start to get parabolic as the mass flow rate starts to be affected by the downstream pressure through the orifice or restriction device more and more. For this you...

Dear All, I have a question and hope that you know answer I have one vessel which is in 207 barg and full of air. there is pipeline which comes from vessel and there is hand valve at the end of the pipeline. in order to fill small air bottle, I will plugged air bottle to line and will open the...

Thanks Compositepro for your response. That is exactly what I am searching for. Why pressure maintaining valve set to 260 barg? not 250 or 240? there should be story of this value. Moreover, as I fill bottle with air, will pressure after PCV will decrease? or not? ( which is 207 barg)

You are very helpful. really thanks a lot. you saved me. But Again I have questions, I will be grateful if you answer. From your first paragraph, I understood that pressure (207 barg) after PCV will be constant till needle valve just above of air bottle. Am I right? which means that in ALL...

zeusfaber , You are great person I am looking for. thanks a lot for clear and wide response. Thing about pressure maintaining valve is that it is exactly pressure maintaining valve because of documentation. Moreover, when I visited offshore platform I looked at pressure gauges in accumulators...

LittleInch, That is actually my problem that I don't understand how system works. please look at attached P&ID. There are 2 compressors which works lead/lag. There are 6 accumulator bottles and each of them 61litr. In line which comes to bottle, there is pressure regulator which reduce pressure...

LittleInch, Thank you for response. I have only one data which shows relationship between compressor pressure and its flow rate. below graph, it stated that charging rate is subjected to tolerance of 15%. performance figures relate to maximum speed 1750 rev/min and ambient normal temperature...

Dear All, I need your help. Please help me. I would be very grateful. Case is like that: there are air compressor, and recharging station. in recharging station, 6 of 9 litre air bottle will be recharged (from 0 to 200 bar) at the same time. I need to calculate time to recharge these bottles...