FCC raw feed riser issue
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FCC (coaxial): During startup and shutdown, what is the amount of expansion/contraction of the raw oil riser? What impact will it have on the newly installed gate valve? I hope to receive guidance from all the teachers. Thank you!
The check valve is equipped with expansion absorption, which automatically adjusts the valve position in response to the expansion/contraction of the riser
Expansion can cause damage to the top of the plug valve, while contraction can result in the valve not closing properly. During each startup and heating process, it is necessary to keep records of the valve position and determine the final closed position of the valve.
The expansion amount of the startup riser should be determined based on the regenerator temperature; our expansion amount is generally around 10 cm.