Search results for query: *

Thanks Morten.

Thanks littleinch.

Thanks for having a look littleinch. I am not sure if you are familiar with LOPA but for such reviews you need to consider the consequences of a single cause (in this case spurious opening of a HGB valve) without any layers of protection (combination causes would also be considered but the...

Thanks for having a look. Perhaps my wording was not the best but I am considering one off the HGB valves spuriously opening for either individually not both at the same time. In any case as you say a dynamic analysis is required to see how the system actually reacts, which would be a very...

Hi there, I am looking at the attached centrifugal compression system and I am considering the unmitigated consequences (ignoring all trips/interlocks - there are limit switches on the HGB valves and high temperature trips that trip the compressor but these are assumed to not act) of the hot...

Thanks for replying, see responses below… The issue is that compressor surge control cannot really be separated from the overall system control and for me there are a few issues with your description. PCV d/s of compressor and cooler and presumably d/s of the surge / recycle line? Yes. This...

I am trying to get my head around one aspect of surge control: System – Single stage centrifugal compressor with discharge cooler and suction scrubber. There is a PCV controlling the pressure downstream of the discharge cooler and there is a surge control recycle line downstream of the cooler...

Hi, In a LOPA for a certain scenario, a hazard is protected by the BPCS which closes a control valve. It is also protected against by a independent trip which closes a separate ESD valve. Can an operator response be credited as an IPL if the response is independent of the other IPLs EXCEPT that...

Ok, thanks. It is a bit of a confusing way of stating the information, SCFM would not leave it open to interpretation.

Hi, A P&ID states the duty of a screw compressor as “x CFM at y psig”, compressing atmospheric air. To work out the compressor mass flow rate for start-up conditions where the downstream pressure is also at atmospheric then I would use x and y? Is this correct or should the mass flow rate be...