JustSomeRoark
Chemical
- Apr 12, 2007
- 18
Gents:
I am currently involved in the analysis of the results/findings of a dynamic simulation of the ESD of a gas compressor. This is a fairly large unit compressing some 300 MMSCFD of natural gas between 350 and 1000 psig. The results provided by the third party in charge of this simulation include the rhov2 in some points of the system (i.e. compressor discharge, inlet/outlet of antisurge valves and hot bypass valves etc.) Until I joined my current company I was involved in a couple experiencies similar to this, but no one paid much attention to the rhov2 parameter. However, in this project this is proving a challenge, as we are obtaining fairly large values (i.e. around 200000 Pa, but just for 2-3 seconds) and my Stress colleagues are worried since apparently they cannot support the lined adequately to withstand the loads caused by this scenario.
I am concerned that they may not be doing a proper analysis, since as I mentioned before, in my experience such attention was never paid to this parameter. Unfortunately my background is Process Eng so I cannot tell 100% sure whether they are missing something. Based on your experience as Process Engineers, how do you analyse the results of a dynamic simulation study of a compressor, focusing on the ESD scenario? What are the major parameters that you check? Do you pay special attention to rhov2 or do you assume that due to the small duration of the event (peaks velocities/rhov2 are only observed for 2-3 seconds) the piping system will be able to withstand the scenario of the rapid opening of a relatively large on/off valve upon the ESD of a compressor?
Thanks in advance for your feedback.
Regards.
I am currently involved in the analysis of the results/findings of a dynamic simulation of the ESD of a gas compressor. This is a fairly large unit compressing some 300 MMSCFD of natural gas between 350 and 1000 psig. The results provided by the third party in charge of this simulation include the rhov2 in some points of the system (i.e. compressor discharge, inlet/outlet of antisurge valves and hot bypass valves etc.) Until I joined my current company I was involved in a couple experiencies similar to this, but no one paid much attention to the rhov2 parameter. However, in this project this is proving a challenge, as we are obtaining fairly large values (i.e. around 200000 Pa, but just for 2-3 seconds) and my Stress colleagues are worried since apparently they cannot support the lined adequately to withstand the loads caused by this scenario.
I am concerned that they may not be doing a proper analysis, since as I mentioned before, in my experience such attention was never paid to this parameter. Unfortunately my background is Process Eng so I cannot tell 100% sure whether they are missing something. Based on your experience as Process Engineers, how do you analyse the results of a dynamic simulation study of a compressor, focusing on the ESD scenario? What are the major parameters that you check? Do you pay special attention to rhov2 or do you assume that due to the small duration of the event (peaks velocities/rhov2 are only observed for 2-3 seconds) the piping system will be able to withstand the scenario of the rapid opening of a relatively large on/off valve upon the ESD of a compressor?
Thanks in advance for your feedback.
Regards.