Thanks for all the comments. Our conclusion is that the pressure at the exit of the pipe is atmospheric pressure and that any losses are cancelled out by the pressure recovery according to the Bernoulli principle.
Thanks for both your responses.
To clarify, are you saying that the velocity head loss across the pipe exit is lost as energy (heat) to the atmosphere, rather than a frictional pressure drop across the fitting?
Also (to help get this clear in my head), if there was a vessel at the exit of the...
I'm trying to calculate the pressure drop in a PSV discharge line. The set pressure is low so the pressure drop allowable is low to meet back pressure limitations. For the pipe exit to atmosphere, crane quotes a k-value of 1.0. For a 10" pipe this adds a lot to the equivalent length (~14m)...
I'm looking for European equivalents of the API practices for relief valve sizing and installation in refineries. Does anyone know of a suitable resource?
Thanks.
Thanks for the replies and apologies for not giving enough detail to make the problem clear.
The system is a serious of liquid filled wash towers. Check valves are installed between the towers to prevent back contamination of one solvent to another. The relief path of the first tower is through...
Are there any rules preventing you from installing check valves into a line that forms the relief path of a vessel protected against fire?
Also, are there any peculiarities with Stoomwezen rules in this case?
Thanks
