Process flow diagram
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Dear teachers, I would like to ask what function this inverted \"S\"-shaped elbow serves here.
Could you briefly explain what this device is and what the medium in the pipeline is?
The VCM unit – the main components in this pipeline are dichloroethane and ethylene.
It is probably designed to remove gases from the liquid medium at the inlet, for reference only.
In fact, this type of setup is commonly used in processes involving volatile or gas-producing media, to ensure that what is drawn in is primarily liquid and to prevent cavitation.
Used to prevent gas from entering the pump inlet in large quantities, thereby facilitating fluid flow
The main function of this pipe is to connect to the balance line of MS-313 at the U-turn; the pump inlet located at this U-turn is used primarily for gas collection, to prevent the pump from failing to draw in fluid
According to the PFD diagram, this is called a “U-turn”; the flow at 327 should be a two-phase flow. You can take a look at the material balance sheet. The gas phase is discharged from the top of the U-bend to the separation tank, while the liquid phase and the liquid in the separation tank go to the pump inlet. This function is to prevent gas from entering the pump body and causing air locking. Question: Why doesn’t this 327 logistics stream go directly into the separation tank?