PSV vs HIPPS on fuel gas supply line of Centrifugal Compressor
PSV vs HIPPS on fuel gas supply line of Centrifugal Compressor
(OP)
Dear all
I have a centrifugal compressor driven by a Gas Turbine. Due to limited flare system capacity, we want to install a HIPPS on fuel gas supply line acrivated by PZHH (may be putting some voting mechanism) rather than a common PSV on the compressor discharge line.
Please advise your objection to this concept.
Thank you and regards
Dung
I have a centrifugal compressor driven by a Gas Turbine. Due to limited flare system capacity, we want to install a HIPPS on fuel gas supply line acrivated by PZHH (may be putting some voting mechanism) rather than a common PSV on the compressor discharge line.
Please advise your objection to this concept.
Thank you and regards
Dung





RE: PSV vs HIPPS on fuel gas supply line of Centrifugal Compressor
To justify HIPS, you will have to demonstrate to higher Operations and Engineering management that (a) all reasonable methods to debottle neck the compressor discharge PSV / flare system to handle the higher rate have been studied and found to be not possible (b)that the risk involved in operating the HIPS for the remaining life of this facility are lower than project construction risks for the modifications that could be made to avoid a HIPS.
RE: PSV vs HIPPS on fuel gas supply line of Centrifugal Compressor
RE: PSV vs HIPPS on fuel gas supply line of Centrifugal Compressor
Also how much above design pressure can your system see. If less than 33%, you might be OK as a short term spike to B 31.3.
Your HIPPS would need to be a dedicated system linking your 2003 PTs direct tot he logic board then onto your dual in line fail closed valves.
Certainly a bit novel, but not clear to me what scenario you are trying to resolve with this system.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: PSV vs HIPPS on fuel gas supply line of Centrifugal Compressor
Could you limit flow using a restriction orifice in the FG line e.g. upstream the control valve that i assume lets down the pressure from whatever to GT FG pressure or maybe replace the Cv with a smaller size so that the PSV would not have to be so big?
RE: PSV vs HIPPS on fuel gas supply line of Centrifugal Compressor
Sorry for late response, I am a bit busy last few days.
georgeverghese:
Sorry but I don; get your point, if HIPPS is installed on compressor discharge, it can operate independently to Compressor UCP, eg if blocked outlet says two PZHH on compressor discharge will demand HIPPS installed on Fuel Gas supply line to close and therefore compressor ultimately stop (at least to raise a higher pressure than normal discharge pressure). I do agree that as per API 521, application of HIPPS can only be implemented if the common PSV is not practical.
LittleInch:
As said above, I am trying to avoid blocked outlet case of export SDV. Thanks for your reminder on the link between no flow case on surge protection system.
MortenA:
I am trying to protect my compressor during blocked outlet event by cut off the fuel gas line with highly reliable instrumented protection system not protect my fuel gas system, the reason is simple fuel gas system operates at lower pressure hence PSV protection can be easily accommodated but for process side the flow and pressure is much higher.
Cheers
Dung
RE: PSV vs HIPPS on fuel gas supply line of Centrifugal Compressor
A HIPPS design that shuts off the fuel gas flow will obviously have the desired effect - shutting off the compressor - however, I think you can also design the HIPPS to directly trip the compressor motor.
RE: PSV vs HIPPS on fuel gas supply line of Centrifugal Compressor
RE: PSV vs HIPPS on fuel gas supply line of Centrifugal Compressor
RE: PSV vs HIPPS on fuel gas supply line of Centrifugal Compressor
RE: PSV vs HIPPS on fuel gas supply line of Centrifugal Compressor
I want to design vaccum breakers/Air releave valves at high elevation points of the offshore platform fire water system. I would like to know is there any guide lines to design these breakers to avoid column seperation. I am looking for the following details.
1.how many number of breakers are required?
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I really appreciate your reply.
Thanks
Regards,
RK