Greetings All, I have a question regarding Pressure Loss through a Small hole vs Time. My simplified scenario is that I have a vessel filled with Sea Water Pressured up to 70 bar. At the outlet valve, there is a pressure release port of 5mm dia which is able to relieve the pressure down to 3 bar is a matter of 3 seconds. To describe the scenario better, only after the pressure has been released can the valve be opened fully. Question:- How long will it take if i increase the Pressure release port to say 10mm. I would like to make the pressure release even faster. Is there a direct relation of rate of pressure release to size of hole?? Am unable to find anything regarding this topic. There is a similar thread but cannot make anything out of the response there. https://www.physicsforums.com/showthread.php?t=171660&highlight=pressure+loss+hole+time MAny Thanks & Regards.