Layout of vent pipes in the spherical tank area
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The vent pipes in the liquefied hydrocarbon tank farm include the discharge from the safety valves on top of the non-spherical tanks, as well as the discharge from the expansion safety valves of the liquefied hydrocarbon pipelines. The discharge from the safety valve on the spherical tank roof can be guided down to a certain height along the roof, and then connected step by step to the flare gas main in the pipe gallery. The vent pipeline of the safety valve on the pipe pier can only be laid along the pipe pier; it cannot be connected step-by-step to the flare gas main, resulting in liquid condensate at the lowest point. I have also seen air release pipes on the top of tanks descend to the pipe piers at ground level before going up into the pipe gallery. How can this condensate problem be solved? Should the pipeline be insulated? What do everyone else do?
It may be necessary to consider adding electric heat tracing.
It’s not practical to achieve sealed liquid discharge from the liquid separation tank in the tank area – the pipe supports are already quite low, and the liquid separation tank has to be buried underground. :L
Projects done in the past used steam heating, but is this approach practically feasible? Are there any safety hazards?
1. Evacuation can be carried out urgently by releasing the gas directly, provided that liquefied gas or propylene is stored there. 2. Emergency pressure relief can be achieved using a safety valve on the top of the tank; the piping leading to the main flare line can be extended from behind this valve. If there are low points along the way, a condensate collection tank can be added. However, in our case, there is basically no liquid in the condensate collection tank. 3. The pressure relief valve designed to prevent overpressure is connected directly to the main flare pipe. 4. Heat tracing is not necessary
It depends on the medium you store. If there is a high content of C4 component, the vent line cannot pass through pipe supports, as this will affect the vent back pressure