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I intended to have Nebosh oil and gas certificate but alot of friends told me it is very difficult, So is there any advice about this certificate and Exam

sorry my question that selection of ball valve for pressurization is there problem to the valve if I open it or designer depends on multistage RO-restricted orifice and open ball valve 100% directly?

thanks for your reply distance between valve and orifice is 2m so if I open valve fully open and above pressure is 68barg is there any problemhttps://files.engineering.com/getfile.aspx?folder=5bfe538d-7416-4ec2-903c-9c04df8e9d93&file=1820-SA3-27-EPR-PID-581_REV_00_.pdf

Hi all, I am confused after going through one P&ID of gas processing facility I have been working. What are the reasons behind using of 2" ball valve upstream multistage RO-restricted orifice for start up pressurization? To my knowledge ball valve is used as on/off valve as if used for...