Destination of the material accumulated in the pump and pipelines during the removal and maintenance of the process material pump in calcium carbide-based vinyl chloride production units
Thread Content
When the process material pump in a calcium carbide-based vinyl chloride plant is taken out for maintenance, there are several possible ways to remove the material accumulated in the pump and pipelines: 1) A dedicated drainage collection tank (an underground tank) is used, with fixed pipelines connecting the drainage valve to the collection tank, thereby allowing the accumulated material to be removed in a sealed manner； 2) A dedicated drainage collection tank (underground tank) is provided; a temporary pipeline is connected between the drainage valve and the collection tank to securely drain the accumulated material ； 3) Temporarily use mobile collection tanks and connecting hoses to collect and drain the material ； 4) Temporarily connect the gas-phase exhaust pipeline to low-pressure systems such as gas holders, so that the accumulated material can be vaporized and then discharged and recovered ； 5) The accumulated materials are directly discharged into the gutter. Let’s discuss which method is currently primarily used in these devices; are there any simpler and more reasonable approaches besides those mentioned above?
Procedure: Depending on the frequency of inspections and repairs, it is best to use a gas recovery tank (for installation) in cases where repairs are carried out frequently; however, it is necessary to control the flow rate and the amount of gas recovered to prevent ice buildup in the pipelines； It is not done frequently; valves and quick connectors are installed on the pipelines of the recovery gas tank. In the workshop, a dedicated drainage collection tank is used for collection, and then the liquid is connected to the quick connector to be sent back to the recovery gas tank.
4) Temporarily connect the gas-phase exhaust pipeline to low-pressure systems such as gas holders, so that the accumulated material can be vaporized and then discharged and recovered； This is the best solution
The first-phase pump did not have a recovery pipeline; to repair it, it was necessary to empty it. In the second phase, we added a recovery pipeline that allows the fluid to be sent back to the gas holder.