Regarding the piping issues of hydrogen high-pressure pumps
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Hydrogenation unit, feed high-pressure pump (reciprocating plunger pump, outlet pressure: 20 MPa). Is it necessary to install check valves and a minimum flow return line in the pump outlet process piping?
All 4 factories I know are like this.
The minimum flow line is intended to protect the pump when it is started, while the check valve serves to protect the pump in case of a sudden shutdown
In addition to protecting the pump, check valves also safeguard the low-pressure equipment and pipelines upstream of the pump; the explosion in the raw oil tank that occurred last time was caused by a problem with the check valve.
Personal opinion: A minimum return path must be established. Moreover, there should be at least two check valves on the high-pressure outlet pipeline
Where did the accident you mentioned take place?
The accident in Jiujiang was a hot topic of discussion earlier
A minimum reflux and check valve must be installed. Setting a minimum backflow is necessary to ensure the proper startup of the high-pressure pump ； A check valve is installed at the outlet of the high-pressure pump; its purpose is first to maintain stable pressure in the high-pressure pump, and second to prevent high pressure from leaking into the low-pressure system when the pump stops operating.
It’s necessary to install it in order to protect the pump and prevent backpressure. Since that accident last time, design considerations must give this aspect a lot of attention; it’s unlikely that it will be removed so easily.
It is necessary to effectively prevent high voltage from leaking into low voltage